Land Rover Freelander (2003) Electrical Library

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Electrical Library

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FREELANDER 2003 MY

ELECTRICAL LIBRARY

LRL 0585ENG

Published by Land Rover

recording or other means without prior written permission from Land Rover.

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CONTENTS

INTRODUCTION ...........................................................................1-1

ABOUT THIS DOCUMENT .............................................................................. 1-1

ELECTRICAL PRECAUTIONS ........................................................................ 1-3

ABBREVIATIONS ............................................................................................ 1-5

HOW TO USE THIS DOCUMENT ................................................................... 1-7

FAULT DIAGNOSIS ......................................................................................... 1-9

WIRE COLOUR CODES ................................................................................ 1-10

FUSE DETAILS ............................................................................ 2-1

ENGINE COMPARTMENT FUSE BOX ........................................................... 2-2

PASSENGER COMPARTMENT FUSE BOX ................................................... 2-5

EARTH POINTS AND HEADERS ................................................ 3-1

DESCRIPTION AND OPERATION .............................................. 4-1

ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL) ..................... 4-1

ENGINE IMMOBILISATION ............................................................................. 4-9

WINDOWS ..................................................................................................... 4-12

SUNROOF ..................................................................................................... 4-21

DOOR MIRRORS ........................................................................................... 4-23

FOLDING DOOR MIRRORS .......................................................................... 4-26

HEATED SEATS ............................................................................................ 4-28

DIAGNOSTIC SOCKET ................................................................................. 4-30

CENTRAL CONTROL UNIT (CCU) ................................................................ 4-31

CHARGING AND STARTING – Td4 .............................................................. 4-32

CHARGING AND STARTING – K SERIES .................................................... 4-36

CHARGING AND STARTING – KV6 ............................................................. 4-40

CHARGING AND STARTING – KV6 (NORTH AMERICA) ............................ 4-44

CRUISE CONTROL – TD4 & KV6 (NORTH AMERICA) ................................ 4-48

CRUISE CONTROL – KV6 ............................................................................ 4-52

ELECTRONIC AUTOMATIC TRANSMISSION (EAT) ................................... 4-58

ANTI-LOCK BRAKING SYSTEM (ABS) ......................................................... 4-66

SUPPLEMENTARY RESTRAINT SYSTEM (SRS) ........................................ 4-71

AIR CONDITIONING (A/C) – Td4 .................................................................. 4-73

AIR CONDITIONING (A/C) – K SERIES AND KV6 ........................................ 4-77

AIR CONDITIONING (A/C) – KV6 (NORTH AMERICA) ................................ 4-81

HEATER BLOWER ........................................................................................ 4-85

FUEL BURNING HEATER (FBH) ................................................................... 4-87

POSITIVE TEMPERATURE COEFFICIENT (PTC) HEATER ........................ 4-88

FREELANDER 03MY 1

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CONTENTS

COOLING FANS ............................................................................................ 4-90

HEATED REAR WINDOW (HRW) ................................................................. 4-93

HEATED FRONT SCREEN (HFS) ................................................................. 4-96

WIPERS AND WASHERS ............................................................................. 4-98

BRAKE AND REVERSE LAMPS ................................................................. 4-103

HEAD, SIDE AND TAIL LAMPS ................................................................... 4-106

HEAD, SIDE AND TAIL LAMPS – CANADA ................................................ 4-110

FOG LAMPS ................................................................................................ 4-114

DIRECTION INDICATOR/HAZARD WARNING LAMPS .............................. 4-116

INTERIOR LAMPS ....................................................................................... 4-118

INTERIOR ILLUMINATION .......................................................................... 4-122

INSTRUMENTS ........................................................................................... 4-124

HORNS ........................................................................................................ 4-129

REMOTE DISPLAY / CLOCK ...................................................................... 4-130

CIGAR LIGHTER ......................................................................................... 4-131

ACCESSORY SOCKET ............................................................................... 4-132

AUDIO SYSTEM – LOW LINE ..................................................................... 4-133

AUDIO SYSTEM – MID LINE ....................................................................... 4-136

NAVIGATION SYSTEM ............................................................................... 4-140

FUEL PUMP ................................................................................................. 4-145

ROTARY COUPLER .................................................................................... 4-148

CONNECTOR ............................................................................... 5-1

CIRCUIT REFERENCE NUMBERS ................................................................. 5-1

2 FREELANDER 03MY

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INTRODUCTION

ABOUT THIS DOCUMENT

General

This document is intended to assist in diagnosing electrical faults, and should be used in conjunction with the Electrical Circuit Diagrams. The document is divided into the following sections.

1. INTRODUCTION – Includes Electrical Precautions, a list of Abbreviations and

general information on how to use this document.

2. FUSE DETAILS – Provides details of location, rating in Amperes, and circuit(s)

protected.

3. EARTH POINTS AND HEADERS – Provides details of earth points and earth

headers, including a plan view of the vehicle to aid location.

4. DESCRIPTION AND OPERATION – Provides an explanation of how each of the

systems operate.

5. CIRCUIT REFERENCE NUMBERS – Provides a list of circuit reference numbers

against a model or feature to which they apply.

6. CONNECTOR DETAIL – Details of connectors including a location photograph, face

view and pin-out table.

NOTE: Before starting electrical checks on the vehicle, ensure that relevant mechanical functions operate satisfactorily.

References

References to the LH or RH side given in this document are made when viewing the vehicle from the rear.

Operations covered in this document do not include reference to testing the vehicle after repair. It is essential that work is inspected and tested after completion and, if necessary, a road test of the vehicle is undertaken, particularly where safety related items are concerned.

CAUTION: Before undertaking any electrical work on a vehicle ALWAYS read the ELECTRICAL PRECAUTIONS.

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INTRODUCTION

Battery Voltage

Open Circuit Voltage Test

Before commencing diagnosis of electrical problems, verify the condition of the battery is acceptable by using the open circuit voltage test.

1. Switch off all electrical loads on the vehicle.

2. Adjust digital multimeter to read dc volts on the appropriate scale.

3. Connect test probes across battery terminals ensuring that polarity is correct and record the voltage displayed.

A reading of 12.3 V or more is acceptable; any battery which reads less than this will need charging.

NOTE: If the vehicle has been used within a period of 8 hours prior to the test, surface charge must be removed from the battery by switching the headlamps on for approximately 30 seconds. Wait a further 60 seconds before checking the open circuit voltage.

Battery voltage is used as a known reference for ascertaining whether or not circuits are receiving sufficiently high voltage for components to function correctly. This reference is only a guide since most electronic circuits are designed to function over a wide range of voltages. In addition, consideration must be given to readings affected by voltage drop across certain components and fluctuations due to cable lengths.

1.2 FREELANDER 03MY

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INTRODUCTION

ELECTRICAL PRECAUTIONS

General

The following guidelines are intended to ensure the safety of the operator whilst preventing damage to the electrical and electronic components fitted to the vehicle. Where necessary, specific precautions are detailed in the relevant sections of this document, reference of which should be made prior to commencing repair operations.

Equipment – Prior to commencing any test procedure on the vehicle, ensure that the relevant test equipment is working correctly and any harness or connections are in good condition. This particularly applies to mains lead or connections.

WARNING: Before commencing work on an ignition system, all high tension terminals, adaptors and diagnostic equipment for testing should be inspected to ensure that they are adequately insulated and shielded to prevent accidental personal contact and to minimise the risk of shock. Wearers of surgically implanted pacemaker devices should not work in close proximity to ignition circuits or diagnostic equipment.

Polarity – Never reverse connect the vehicle battery and always observe correct polarity when connecting test equipment.

High Voltage Circuits – Whenever disconnecting live ht circuits, always use insulated pliers and never allow the open end of the ht lead to come into contact with other components, particularly ECU's. Since high voltage spikes can occur on the terminals of the coil while the engine is running, exercise caution when measuring the voltage at these points.

Connectors and Harnesses – The engine compartment of a vehicle is a particularly hostile environment for electrical components and connectors. Always ensure these items are dry and oil free before disconnecting and connecting test equipment. Never force connectors apart either by using tools or by pulling on the wiring harness. Always ensure locking tabs are disengaged before removal and note orientation to enable correct reconnection. Ensure that any protective covers and substances are replaced if disturbed.

Before removing a faulty component, refer to the Workshop Manual for removal procedures. Ensure the ignition switch is turned to the 'OFF' position, the battery is disconnected (see Battery Disconnecting) and any disconnected harnesses are supported to avoid any undue strain at the terminals. When replacing the component keep oily hands away from electrical connection areas and push connectors home until any locking tabs fully engage.

FREELANDER 03MY 1.3

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INTRODUCTION

Battery Disconnecting

Before disconnecting the battery, switch off all electrical equipment. If the radio is to be serviced, ensure the security code has been deactivated. When the battery is disconnected, certain data such as radio code and clock time will be lost.

CAUTION: To prevent damage to electrical components, ALWAYS disconnect the battery when working on the vehicle electrical systems. The earth lead must be disconnected first and reconnected last. Always ensure that battery leads are routed correctly and are not close to any potential chafing points.

Battery Charging

Recharge the battery out of the vehicle and keep the top well ventilated. While being charged or discharged, and for approximately fifteen minutes afterwards, batteries emit hydrogen gas. This gas is inflammable.

Always ensure any battery charging area is well ventilated and that every precaution is taken to avoid flames and sparks.

Disciplines

Switch off ignition prior to making any connection or disconnection in the system as electrical surge caused by disconnecting 'live' connections can damage electrical components.

Ensure hands and work surfaces are clean and free of grease, swarf, etc. as grease collects dirt which can cause tracking or high-resistance contacts.

When handling printed circuit boards, treat them as you would a disc – hold by the edges only; note that some electrical components are susceptible to body static.

Connectors should never be subjected to forced removal or refit, especially inter-board connectors. Damaged contacts will cause short-circuit and open-circuit conditions.

Prior to commencing testing, and periodically during testing, touch a good earth, i.e. cigar lighter socket, to discharge body static as some electrical components are vulnerable to static electricity.

Grease for Electrical Connectors

Some under bonnet and under body connectors are protected against corrosion by the application of a special grease during production. Should connectors of this type be disturbed, repaired, or replaced, a grease of this type, available under part number BAU 5811, should again be applied. Do not apply grease to any connectors that do not have grease applied as standard.

NOTE: The use of other greases must be avoided as they can migrate into relays, switches, etc. contaminating the contacts and leading to intermittent operation or failure.

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ABBREVIATIONS

General

A Ampere ABS Anti-lock braking system ac Alternating current A/C Air Conditioning ATF Automatic transmission fluid BUS Databus CAN Controller area network Cav Cavity Cct Circuit CCU Central control unit CDL Central door locking CHMSL Centre high mounted stop lamp Col Colour dc Direct current DCU Diagnostic control unit EAT Electronic automatic transmission EBD Electronic braking force distribution ECM Engine control module ECT Engine coolant temperature ECU Electronic control unit EKA Emergency key access ETC Electronic traction control FFuse FL Fusible link HDC Hill descent control HFS Heated front screen HRW Heated rear window HT High tension ISO International Organisation for Standardisation LED Light emitting diode LH Left hand LHD Left hand drive MIL Malfunction indicator lamp NAS North American specification PTC Positive Temperature Co-efficient PWM Pulse width modulated

INTRODUCTION

FREELANDER 03MY 1.5

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INTRODUCTION

RRelay RF Radio frequency RH Right hand RHD Right hand drive ROW Rest of world SRS Supplementary restraint system VVolt VIN Vehicle identification number WWatt

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INTRODUCTION

HOW TO USE THIS DOCUMENT

Fuse Details

Contains information on fuse functions and values and should be used together with the power distribution circuit diagrams to establish which systems share a common power supply and to ensure that correct value fuses are fitted.

Earth Points and Headers

Shows a plan view of the vehicle with location of all earth points. Supporting photographs and connector detail information appear in the Connector section.

Description and Operation

Presented in the same order as the circuit diagrams in the Electrical Circuit Diagram folder, each of the descriptions contains a brief overview of the main system functions and includes reference to the appropriate wire colours. Always read this section before starting work on a system so that a good understanding of system functionality is obtained.

Connector Details

This section is effectively an index of every electrical connector on the vehicle, including headers and eyelets. A page is dedicated to each connector, with the information presented in a standard format. The connector number is displayed on each page header to ease reference. Connector information comprises:

z Connector Number – The assigned number, prefixed 'C'. z Connector Name – Usually derived from the component to which the connection is

made.

z Male/Female – If applicable, identifies the gender of the connector pins (NOT the

housing) as Male or Female. Generally, connectors mating directly into a component have Female pins.

z Colour – If applicable, the colour of the connector housing is shown. NATURAL is

used to describe connectors with a clear/translucent plastic finish.

z Location Statement – Used in conjunction with the photograph to determine the

location of the connector.

z Photograph – Shows the location of the subject connector. In most cases the

photograph will indicate the amount of trim removal necessary to reveal the connector. For convenience some photographs identify more than one connector.

z Face View – An outline of the connector housing, viewed from the front, showing pin

numbers (if applicable).

z Pin-out Table – A three column table, detailing the colour and position of each wire in

the connector:

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INTRODUCTION

Cav Col Cct

1GR ALL 2B ALL

1. Cav: The connector pin (cavity) number.

2. Col: The colour of wire populating the connector pin.

3. Cct: Identifies the model or feature which uses the wire. 'ALL' means applicable to all models in the range fitted with the feature or system in question. In instances where different models, features or systems require different colour wires to be fitted in a cavity, each instance of the cavity is included in the pin-out table.

NOTE: Wires may not be fitted to all cavities.

Example – 12 Pin Connector

Cav Col Cct

2G ALL 4GW 8 4GB 10 4GR 12 5LGB ALL 6GB 8 6GW 10 6GR 12 8B ALL

Where necessary, a table listing the circuit reference numbers against a description of the model or features which may or may not be fitted can be found at the beginning of the connector section. A sample of a typical table is shown below.

Cct Model or Feature

13 Door 25 Door 3LHD 4 RHD 5 Japanese vehicles only 6 NAS vehicles only 7 Australian vehicles only

1.8 FREELANDER 03MY

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INTRODUCTION

FAULT DIAGNOSIS

General

When diagnosing an electrical fault, follow the steps below:

1. Read the circuit description appropriate to the reported fault to ensure a good understanding of circuit operation.

2. Study the power distribution, fuse details and earth distribution diagrams and identify other circuits which share fuses and/or earth points. Check whether these circuits operate correctly.

3. Using the photographs contained in the Connector section, locate a point on the circuit (approximately half way between supply and earth) which is easily accessible.

4. Check that the pin-out details of the connector are correct and that the correct signals exist at the correct terminals.

5. Using the marker pen supplied (or other suitable non-permanent marker pen), mark the parts of the circuit you have verified.

6. Continue to the next point on the circuit which is easiest to access and repeat the above.

7. Continue with this approach until a fault is found, rectify the fault and then verify that the circuit operates correctly.

CAUTION: Never probe directly into the front face of a connector. This can damage the terminal and cause a failure. Always probe the back of a terminal, taking care not to damage the terminal or any seals.

Never probe wire insulation. On small diameter cables this can cut the conductors. It may also allow moisture into the cable, causing corrosion.

FREELANDER 03MY 1.9

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INTRODUCTION

WIRE COLOUR CODES

General

The following list contains wire colour codes used on the vehicle harness's.

Code Colour

BBlack GGreen KPink

LG Light green

NBrown OOrange PPurple RRed S Slate (Grey)

T Transparent UBlue

WWhite

YYellow

1.10 FREELANDER 03MY

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FUSE DETAILS

Introduction

Fuses are mounted in one of two fuse boxes. One fuse box is located in the LH rear side of the engine compartment, and the other is located behind the driver side cubby box.

The engine compartment fuse box contains three different types of fuse:

1. Blade type fuse – Small, pull out, male fuse, used to protect circuits from 5 A to 30 A.

2. J–case fuse – Square shaped, pull out, female fuse, used to protect circuits from 30

A to 60 A.

3. Bolt down fuse – Also known as a fusible link, used to protect circuits from 40 A to

250 A.

The passenger compartment fuse box contains blade type fuses only.

WARNING: Contained within the passenger compartment fuse box is the SRS fuse. This is identifiable by its yellow cover. Do not carry out any work on the SRS system before reading the SRS warnings, cautions, and notes contained within the Introduction section of the Workshop manual.

FREELANDER 03MY 2.1

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FUSE DETAILS

ENGINE COMPARTMENT FUSE BOX

Relays (R)

1. Fuel pump relay.

2. Starter relay.

3. HDC relay.

4. Main relay.

5. ECM relay (NAS only).

6. Horn relay.

7. A/C compressor clutch relay.

2.2 FREELANDER 03MY

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FUSE DETAILS

Link Rating Vehicle Function

FL1 150 A All Alternator, FL2, FL7, FL10, fuse 5, fuse 8 and fuse 9

of the engine compartment fuse box. FL2 60 A All Ignition switch. FL3 60 A All Ignition switch. FL4 80 A All CCU, window lift relay, auxiliary relay, HRW relay,

and fuse 9, fuse 13, fuse 14, fuse 15, fuse 30, fuse

31 and fuse 32 of the passenger compartment fuse

box. FL5 80 A A/C fitted Cooling fan control unit FL5 40 A Non A/C Cooling fan relay. FL6 100 A NAS Not used. FL6 100 A Td4 Glow plug relay. FL7 40 A All Starter relay. FL8 40 A All ABS ECU. FL9 40 A All Main/dipped beam relay, and fuse 21 and 22 of the

passenger compartment fuse box.

FL10 40 A All except

NAS FL10 40 A NAS ECM relay. FL11 40 A All ABS ECU. FL12 40 A All Lighting switch.

Not used.

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FUSE DETAILS

Fuse Rating Vehicle Function

F1 15 A Td4 Glow plug relay. F1 15 A K1.8 Purge control valve, HO2S F1 15 A KV6 HO2S, splice joint 14. F1 15 A NAS Fuel pump, splice joint 14. F2 20 A Td4 ECM. F2 20 A K1.8 ECM, fuel injectors, splice joint 1. F2 20 A KV6 ECM, fuel injectors, splice joint 15. F2 20 A NAS ECM, header 294. F3 15 A K1.8 Splice joint 2 F3 15 A KV6 Splice joint 13. F3 15 A NAS Header 294. F4 15 A Td4 Splice joint 51, A/C compressor clutch relay, E-Box

temperature sensor, cooling fan control unit.

F4 15 A K1.8 Splice joint 51, A/C compressor clutch relay, cooling

fan control unit, cooling fan relay, E-box temperature sensor.

F4 15 A KV6 Splice joint 51, A/C compressor clutch relay, cooling

fan control unit, E-box temperature sensor.

F4 15 A NAS Splice joint 51, A/C compressor clutch relay, E-box

temperature sensor. F5 20 A Td4 ECM, fuel burning heater. F5 20 A K1.8, KV6 &

NAS F6 15 A All Horn relay. F7 15 A All Splice joint 12. F8 30 A All Blower motor relay. F9 10 A All A/C compressor clutch relay.

F10 20 A Td4 Inertia switch. F10 10 A K1.8, KV6 &

NAS

ECM.

Inertia switch.

2.4 FREELANDER 03MY

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PASSENGER COMPARTMENT FUSE BOX

Relays (R)

1. Main/Dipped beam relay

2. HRW relay

3. Accessory socket relay

4. Auxiliary relay

5. Window lift relay

6. Flasher unit

FUSE DETAILS

FREELANDER 03MY 2.5

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FUSE DETAILS

Fuse Rating Vehicle Function

F1 15 A Td4, K1.8,

KV6, & NAS

F1 15 A Canada Rear washer switch, splice joint 45, daylight running

F2 15 A Td4 & K1.8 Reverse lamp switch, splice joint 16. F2 15 A KV6 & NAS Splice joint 16. F3 20 A All CCU, windscreen wash/wipe switch, windscreen

F4 25 A All Blower motor switch. F5 10 A All Splice joint 21. F6 10 A All ECM. F7 5 A All ABS ECU. F8 15 A All Hazard warning switch, instrument pack, CCU. F9 15 A Low Line

ICE

F9 15 A Low Line

ICE plus CD F9 15 A Mid-line ICE Audio system head unit. F9 15 A Mid-line ICE

plus power

amplifier

F9 15 A Navigation

System F10 15 A All Cigar lighter. F11 10 A All Splice joint 22. F12 15 A All Sunroof switch. F13 20 A All Accessory socket relay. F14 5 A 5 door Rear interior lamp, illumination relay, header 1000,

F14 5 A 3 door Interior lamp, illumination relay, header 1000, header

F15 20 A All CCU. F16 10 A Td4, K1.8 &

KV6 F16 10 A NAS CCU, splice joint 40, RH headlamp. F17 10 A All Mirror switch. F18 15 A All Instrument pack, RH headlamp. F19 10 A All Alternator

Rear washer switch, splice joint 45.

relay.

wiper motor.

Audio system head unit.

Splice joint 2.

Splice joint 4.

header 0285.

0285.

CCU, header 286, header 1000, splice joint 40.

2.6 FREELANDER 03MY

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FUSE DETAILS

Fuse Rating Vehicle Function

F20 15 A All LH headlamp. F21 15 A All Not used. F22 10 A All Rear fog lamp relay. F23 20 A All HRW, HRW switch. F24 10 A All LH headlamp. F25 10 A All RH headlamp. F26 20 A All LH window switch. F27 20 A All RH window switch. F28 10 A Td4, K1.8, &

KV6 F28 10 A NAS LH headlamp, LH tail lamp, trailer pick-up. F29 20 A All Splice joint 44. F30 10 A All Rear wiper relay. F31 20 A All Tail door window lift relay. F32 5 A All Engine immobilisation ECU. F33 20 A All Splice joint 28. F34 20 A All RH front window switch. F35 10 A All Header 292. F36 10 A All SRS DCU.

LH headlamp, LH headlamp levelling motor, LH tail lamp, trailer pick-up, headlamp levelling switch.

FREELANDER 03MY 2.7

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FUSE DETAILS

2.8 FREELANDER 03MY

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EARTH POINTS AND HEADERS

General

The following illustrations indicate the general position of each earth point and header on the vehicle. Refer to the Connector section for more information.

Refer to the Circuit Diagrams for details of electrical components and their associated earth points.

RHD

FREELANDER 03MY 3.21

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EARTH POINTS AND HEADERS

LHD

3.22 FREELANDER 03MY

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DESCRIPTION AND OPERATION

ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL)

DESCRIPTION

General

The anti-theft alarm system is controlled by the Central Control Unit (CCU), which is mounted on the rear of the passenger compartment fuse box. The alarm can be armed and disarmed using the vehicle key or remote handset. The two main features of the alarm system are:

z Perimetric protection. z Volumetric protection.

Perimetric Protection

Perimetric protection secures against intrusion through the bonnet, doors, tail door or roof. The CCU monitors the state of the hinged panels after the alarm system has been armed. If a panel is opened after the alarm has been armed, the alarm will be triggered.

Switches are incorporated into the door latch assemblies, the bonnet, and the tail door. Three door vehicles also have a 'roof on' switch, to inform the CCU if the hard back has been removed, or the soft back is opened.

Perimetric protection is initiated after a valid alarm request is received. If any panel is open when perimetric protection is activated (other than the roof), the alarm will enter a partially armed state.

Volumetric Protection

Volumetric protection provides protection for the vehicle interior. A volumetric sensor monitors the vehicle interior space and activates the alarm if unauthorised movement is detected. The volumetric sensor is located in a central position, behind the headlining.

A fifteen second delay is initiated after the alarm has been armed before signals from the volumetric sensor are interpreted as an intrusion. This precaution is included in the CCU software to avoid accidental or nuisance triggering of the alarm.

For a detailed description of the anti-theft alarm system, refer to the Security section of the System Description and Operation Workshop manual.

FREELANDER 03MY 4.1

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DESCRIPTION AND OPERATION

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to the horn relay, fuse 6, fuse 7, fuse 10, and fusible link 4 (C0632) on an R wire. All are located in the engine compartment fuse box. Fuse 10 (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. Fuse 7 (C0576) provides a constant battery feed to the hazard warning relay located in the passenger compartment fuse box (C0581) on an NO wire.

Fusible link 4 (C0574) provides a constant battery feed to the CCU (C0593) and fuse 14 of the passenger compartment fuse box (C0581) on an NW wire. Fuse 14 (C0589) provides a feed to the alarm LED located in the instrument pack (C0230) and the transponder coil mounted around the ignition barrel (C0049) on P wires. Fuse 14 (C0583) also provides a feed to the diagnostic socket (C0040) and the roof on switch (3 door vehicles only) (C0497) on P wires.

Door Switches

In order for the perimetric alarm system to operate, the CCU monitors the condition of the door switches (including the tail door switch). The door switches are open circuit when the doors are closed. When the doors are opened, the switches close and an earth path is created. The CCU (C0428) is connected to the door switches as follows:

z To the driver door switch (C0441) on a PS then PW wire. z To the passenger door switch (C0441) on a PW wire. z To the LH rear door switch (C0442) on a PW wire. z To the RH rear door switch (C0442) on a PW wire. z To the tail door switch (C0616) on a BO wire.

NOTE: Both front and both rear door switches have the same connector number as they utilise the same harness.

The CCU treats the passenger door, and both rear doors as a single item. All door switches are earthed on B wires.

Bonnet Switch

In addition to the door switches, the CCU also monitors the condition of the bonnet switch. The bonnet switch is a normally open switch. When the bonnet is opened, the switch closes and an earth path is created.

The CCU (C0428) provides a feed to the bonnet switch (C0007) on an RP wire. The switch (C0007) is earthed on a B wire. By monitoring the state of the bonnet switch, the CCU can determine if the bonnet has been opened illegally and sound the alarm if necessary.

4.2 FREELANDER 03MY

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DESCRIPTION AND OPERATION

Roof On Switch (3 Door Vehicles Only)

The roof on switch (C0497) is located on the RH 'D' post, and is provided a constant battery feed by fuse 14 of the passenger compartment fuse box (C0583) on a P wire. The roof on switch is closed when the hard back is fitted, or the soft back is in the fitted position. In this instance, current flows across the switch (C0497) to the CCU (C0428) on a PY wire.

If the hard back is removed (or the soft back is folded down) the roof on switch becomes open circuit, and the feed to the CCU is removed. By monitoring the state of the roof on switch, the CCU can determine if the roof has been opened illegally and sound the alarm if necessary.

Anti-theft Alarm LED

Fuse 14 of the passenger compartment fuse box (C0589) provides a constant battery feed to the anti-theft alarm LED mounted in the instrument pack (C0230) on a P wire. The earth path for the LED (C0235) is controlled by the CCU (C0592) on a UK wire. By switching the earth path on and off, the CCU can control the flashing sequence of the LED.

Inertia Switch

Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. The inertia switch (C0123) is connected to the CCU (C0428) via the engine compartment fuse box by a GU then UG wire.

When the inertia switch is tripped the switch opens, cutting the voltage supply to the CCU. Sensing this, the CCU unlocks all doors and cuts the electrical supply to the fuel pump.

NOTE: The CCU will only unlock all doors if the ignition is switched on, and the anti-theft alarm isn't armed.

For more information on the fuel pump, refer to the relevant Charging and Starting section of this manual.

+ CHARGING AND STARTING – Td4. + CHARGING AND STARTING – K SERIES. + CHARGING AND STARTING – KV6.

FREELANDER 03MY 4.3

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DESCRIPTION AND OPERATION

Volumetric Sensor

The CCU (C0429) provides a feed to the volumetric sensor (C0358 on 3 door vehicles, C1896 on 5 door vehicles) on a WB wire. When the alarm is armed, the volumetric sensor (C0358 on 3 door vehicles, C1896 on 5 door vehicles) returns a signal feed back to the CCU (C0428) on an NB wire. If the sensor detects movement within the vehicle, it withdraws the signal feed to the CCU. Sensing this, the CCU will sound the alarm.

The CCU (C0429) also provides a gain setting signal to the volumetric sensor (C0358 on 3 door vehicles, C1896 on 5 door vehicles) on an SW wire. This enables the volumetric sensor to determine if it is looking at the interior of a 3 door vehicle or a 5 door vehicle and adjust its sensitivity accordingly.

The volumetric sensor (C0358 on 3 door vehicles, C1896 on 5 door vehicles) is earthed on a B wire.

Radio Frequency (RF) Receiver

The CCU (C0429) provides a feed to the RF receiver (C0359) on a Y wire. The RF receiver (C0359) provides a 12 V feed back to the CCU (C0428) on an S wire. When an RF signal is received from the remote handset, the receiver switches the feed back to the CCU between 12 V and 0 V at high frequency.

The RF receiver (C0359) is earthed on a B wire.

Master Lock Switch

The master lock switch is a non-latching rocker switch mounted on the centre console, below the radio. When the bottom (lock) half of the switch is pressed, current is able to flow from the CCU (C0428) to the master lock switch (C0328) on a BN wire. Current flows across the closed switch contacts to earth on a B wire. The CCU will now lock all the doors.

NOTE: The alarm will not be armed when using the master lock switch.

When the top (unlock) half of the switch is pressed, current is able to flow from the CCU (C0428) to the master lock switch (C0328) on a BK wire. Current flows across the closed switch contacts to earth on a B wire. The CCU will now unlock all the doors.

Door Lock Motors

When the CCU receives a request to lock or unlock the doors, it powers the door lock motors as follows:

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DESCRIPTION AND OPERATION

Driver Door

To lock the driver door, the CCU (C0430) provides a feed to the driver door lock motor (C0441) on a K wire. The motor (C0441) is provided an earth path via the CCU (C0430) on an O wire. This enables the motor to drive the latch to the lock position.

To unlock the driver door, the CCU (C0430) provides a feed to the driver door lock motor (C0441) on an O wire. The motor (C0441) is provided an earth path via the CCU (C0430) on a K wire. This enables the motor to drive the latch to the unlock position.

Passenger Door

To lock the passenger door, the CCU (C0430) provides a feed to the passenger door lock motor (C0441) on a K wire. The motor (C0441) is provided an earth path via the CCU (C0430) on an O wire. This enables the motor to drive the latch to the lock position.

To unlock the passenger door, the CCU (C0430) provides a feed to the passenger door lock motor (C0441) on an O wire. The motor (C0441) is provided an earth path via the CCU (C0430) on a K wire. This enables the motor to drive the latch to the unlock position.

NOTE: The driver and passenger door lock motors have the same connector numbers as they utilise the same harness.

LH Rear Door

To lock the LH rear door, the CCU (C0430) provides a feed to the LH rear door lock motor (C0442) on a K wire. The motor (C0442) is provided an earth path via the CCU (C0430) on an O wire. This enables the motor to drive the latch to the lock position.

To unlock the LH rear door, the CCU (C0430) provides a feed to the LH rear door lock motor (C0442) on an O wire. The motor (C0442) is provided an earth path via the CCU (C0430) on a K wire. This enables the motor to drive the latch to the unlock position.

RH Rear Door

To lock the RH rear door, the CCU (C0430) provides a feed to the RH rear door lock motor (C0442) on a K wire. The motor (C0442) is provided an earth path via the CCU (C0430) on an O wire. This enables the motor to drive the latch to the lock position.

To unlock the RH rear door, the CCU (C0430) provides a feed to the RH rear door lock motor (C0442) on an O wire. The motor (C0442) is provided an earth path via the CCU (C0430) on a K wire. This enables the motor to drive the latch to the unlock position.

NOTE: The LH rear and RH rear door lock motors have the same connector numbers as they utilise the same harness.

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DESCRIPTION AND OPERATION

Tail Door

Operation of the tail door latch mechanism is only possible when the vehicle is stationary or travelling at speeds lower than 3 mph (5 km/h). To allow the tail door latch to operate, the CCU (C0430) provides a single voltage pulse to the tail door motor (C0617) on a PU wire. The motor (C0617) is earthed on a B wire.

The CCU receives a road speed signal from the ABS ECU. If road speed rises above 3 mph (5 km/h), the CCU will not provide a voltage pulse to the tail door motor, inhibiting operation of the tail door latch mechanism.

Superlocking

Superlocking inhibits the use of the interior door handles in addition to driving the door lock motors to the lock position. When the CCU receives a request to superlock the doors, it supplies the following outputs in addition to those detailed above in the Door Lock Motors description.

NOTE: The vehicle will not start if the vehicle is superlocked. For more information, refer to the 'Engine Immobilisation' section of this manual.

+ ENGINE IMMOBILISATION.

Driver Door

To superlock the driver door, the CCU (C0430) provides a feed to the driver door superlock motor (C0441) on an NK wire. The superlock motor (C0441) is provided an earth path via the CCU (C0430) on an O wire. This powers the superlock motor to the lock position, inhibiting the interior door handle.

To unlock the driver door from the superlock condition, the CCU (C0430) provides a feed to the driver door lock motor and the superlock motor (C0441) on an O wire. The driver door lock motor and the superlock motor (C0441) are provided an earth path via the CCU (C0430) on a K wire. This powers both motors to the unlock position.

Passenger Door

To superlock the passenger door, the CCU (C0430) provides a feed to the passenger door superlock motor (C0441) on an NK wire. The superlock motor (C0441) is provided an earth path via the CCU (C0430) on an O wire. This powers the superlock motor to the lock position, inhibiting the interior door handle.

To unlock the passenger door from the superlock condition, the CCU (C0430) provides a feed to the passenger door lock motor and the superlock motor (C0441) on an O wire. The passenger door lock motor and the superlock motor (C0441) are provided an earth path via the CCU (C0430) on a K wire. This powers both motors to the unlock position.

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DESCRIPTION AND OPERATION

LH Rear Door

To superlock the LH rear door, the CCU (C0430) provides a feed to the LH rear door superlock motor (C0442) on an NK wire. The superlock motor (C0442) is provided an earth path via the CCU (C0430) on an O wire. This powers the superlock motor to the lock position, inhibiting the interior door handle.

To unlock the LH rear door from the superlock condition, the CCU (C0430) provides a feed to the LH rear door lock motor and the superlock motor (C0442) on an O wire. The LH rear door lock motor and the superlock motor (C0442) are provided an earth path via the CCU (C0430) on a K wire. This powers both motors to the unlock position.

RH Rear Door

To superlock the RH rear door, the CCU (C0430) provides a feed to the RH rear door superlock motor (C0442) on an NK wire. The superlock motor (C0442) is provided an earth path via the CCU (C0430) on an O wire. This powers the superlock motor to the lock position, inhibiting the interior door handle.

To unlock the RH rear door from the superlock condition, the CCU (C0430) provides a feed to the RH rear door lock motor and the superlock motor (C0442) on an O wire. The RH rear door lock motor and the superlock motor (C0442) are provided an earth path via the CCU (C0430) on a K wire. This powers both motors to the unlock position.

Horns

If the anti-theft alarm is triggered, the CCU (C0430) provides an earth path for the horn relay coil (C0576) on a PY wire. The energised horn relay (C0570 & C0576) provides a feed to the LH (C0003) and RH (C0004) horns on PB wires. The horns are earthed on B wires.

By switching the earth path for the relay coil on and off, the CCU can control the operation of the horns.

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DESCRIPTION AND OPERATION

Direction Indicator/Hazard Warning Lamps

If the anti-theft alarm is triggered, the CCU (C0593) provides an earth path for the hazard warning relay coil. The energised hazard warning relay provides a feed to the following:

z The LH rear direction indicator lamp (C0121) on a GR wire z The RH rear direction indicator lamp (C0125) on a GW wire z The LH front direction indicator lamp (C0009) on a GR wire z The RH front direction indicator lamp (C0011) on a GW wire z The trailer pick-up (C0499) on a GR and GW wire.

All are earthed on B wires, except the trailer pick-up which is earthed on a W then B wire.

By switching the earth path for the relay coil on and off, the CCU can control operation of the direction indicator lamps. For more information, refer to the Direction Indicator/Hazard Warning Lamps section of this manual.

+ DIRECTION INDICATOR/HAZARD WARNING LAMPS.

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DESCRIPTION AND OPERATION

ENGINE IMMOBILISATION

DESCRIPTION

General

The function of the engine immobilisation system is to prevent unauthorised starting of the vehicle. The system is controlled by the immobilisation ECU, which is located behind the centre of the fascia. Re-mobilisation is achieved via a transponder in the vehicle key, which is read by a transponder coil when the ignition switch is turned to the 'auxiliary' position. The transponder coil is mounted around the ignition barrel.

For a detailed description of the engine immobilisation system, refer to the Security section of the System Description and Operation Workshop manual.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 32 of the passenger compartment fuse box (C0587) by an NW wire. Fuse 32 (C0584) provides a constant battery feed to the immobilisation ECU (C0059) on a PN wire.

Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028) to fuse 11 of the passenger compartment fuse box (C0588) on a PS wire. Fuse 11 (C0580) provides an auxiliary ignition feed to the Central Control Unit (CCU) (C0430) on an LGW wire.

When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire. Fuse 5 (C0581) provides a feed to the immobilisation ECU (C0059) on a WR wire. The immobilisation ECU (C0059) is earthed on a B wire.

Immobilisation ECU Inputs/Outputs

The immobilisation ECU receives inputs and outputs from a number of different components to ensure the right criteria are met before it will allow the engine to be started.

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DESCRIPTION AND OPERATION

Transponder Coil

The transponder coil (C0049) mounted around the ignition barrel, and is connected to the engine immobilisation ECU (C0059) by KB and KG wires. Both connections between the immobilisation ECU and the transponder coil switch between both inputs and outputs. The transponder coil reads the vehicle identification information contained within the key transponder and relays it to the immobilisation ECU. The immobilisation ECU (C0059) then compares this information with the vehicle identification information received from the Central Control Unit (CCU) (C0429) on a G wire.

Central Control Unit (CCU)

The CCU (C0429) outputs a locking status signal to the immobilisation ECU (C0059) on a KN wire. If the vehicle has been superlocked or the anti-theft alarm system is armed, the immobilisation ECU issues a request for the CCU to remove both before it will allow the engine to be cranked.

NOTE: When the CCU receives a 'remove superlock' signal from the immobilisation ECU, it will unlock the driver door. Superlocking will be removed from the remaining doors if single point entry is selected.

For more information on superlocking and the anti-theft alarm system, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

The CCU also outputs an ignition status signal, informing the immobilisation ECU when the ignition switch has been turned to the 'ignition' position. The CCU (C0428) transmits this signal to the immobilisation ECU (C0059) on an ON wire.

Gearbox Solenoid (Automatic Vehicles Only)

When the gear selector lever is in the Park (P) or Neutral (N) position, the gearbox solenoid (C0244) provides a feed to the immobilisation ECU (C0059) on a W wire. If the selector lever is moved to any other position, the feed is removed and the immobilisation ECU will not allow the engine to be cranked.

Engine Control Module (ECM)

If the correct re-mobilisation code is received from the remote handset, the immobilisation ECU (C0059) transmits a rolling code to the ECM (C0331 on Td4 vehicles, C0913 on K Series vehicles, C0371 on KV6 vehicles) on a YR wire. The ECM (C0603 on Td4 vehicles, C0913 on K Series vehicles, C0371 on KV6 vehicles) will now energise the main relay by providing an earth path for the relay coil (C0576) on a WK wire.

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DESCRIPTION AND OPERATION

Starter Relay

If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on an RW wire. The relay coil (C0576) is earthed on a B wire. The energised relay allows a feed from fusible link 7 to flow across the relay switch contacts (C0572) to the starter motor (C0179) on an NR wire (NR then B on Td4 vehicles). For more details of starter motor operation, refer to the Charging and Starting – Td4 , Charging and Starting – K Series or Charging and Starting – KV6 sections of this manual.

+ CHARGING AND STARTING – Td4. + CHARGING AND STARTING – K SERIES. + CHARGING AND STARTING – KV6.

Diagnostic Socket

The diagnostic socket (C0040) is connected to the immobilisation ECU (C0059) by a K wire, enabling the immobilisation ECU to be interrogated by TestBook or T4.

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DESCRIPTION AND OPERATION

WINDOWS

DESCRIPTION

Door Windows

The front and rear electrically operated windows are opened and closed by using the appropriate non-latching switch mounted on the centre console. Rear window switches (if fitted) are also located on the rear door trim casings. Rear window operation can be controlled by the driver by pressing the rear window inhibit switch, which is also mounted on the centre console.

The window lift system is controlled by the window lift ECU, which is located beneath the centre console, and will only operate when the ignition switch is in the 'ignition' position.

NOTE: When the ignition is switched off, the windows will still operate for approximately 40 seconds. This time out sequence will cease as soon as any of the doors are opened. This feature is not active on the tail door window.

Tail Door Window

The tail door window is opened and closed by using the non-latching switch mounted on the centre console, below the radio/cassette player. Tail door window operation is controlled by the Central Control Unit (CCU), and will only operate when the ignition switch is in the 'ignition' position.

NOTE: The 40 second time out function (see above) does not operate on the tail door window. Tail door window operation will cease as soon as the ignition is switched off.

The tail door window can also be lowered using the remote handset. Pressing and holding the unlock button for approximately 2 seconds will inform the CCU to fully lower the tail door window. The tail door window can be raised by inserting the key in the tail door lock and turning it clockwise.

NOTE: If the key is released before the tail door window has reached the top of its travel, the CCU will lower the window back to the fully open position.

When the tail door handle is operated, a switch in the door handle informs the CCU to delay opening the door and to lower the window approximately 17 mm. This prevents the tail door from being opened with the window still engaged in the seal recess. When the tail door is closed, the CCU lifts the window to engage with the seal recess.

NOTE: When the tail door is open, the tail door window can only be lowered. The window will only raise once the tail door is closed.

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DESCRIPTION AND OPERATION

If the rear wiper is operational, the tail door window will not lower until the wiper is on a downward stroke. When the window is in the lowered position, wiper operation will be suspended. The tail door window will be disabled if any of the following occur:

z The soft back is lowered. z The soft back is removed. z The hard back is removed.

Tail Door Window Calibration

When the CCU is changed from transit mode to a valid market mode, and after the vehicle battery has been disconnected, the tail door window must be calibrated to provide the CCU with a window position datum. When the CCU mode is changed to a valid market, or the battery reconnected, the CCU automatically begins the calibration process by energising the down contacts in the window lift relay module until the window lift motor stalls, to ensure the window is fully down. The calibration procedure is completed as follows:

1. Ensure the tail door is closed, the vehicle unlocked and the alarm disarmed.

2. On three door models, ensure the roof is on (hard back) or lowered and secured (soft back).

3. With the ignition on, use the console switch or the vehicle key in the tail door lock to raise the window until the motor stalls with the window fully closed.

4. Switch off the ignition.

NOTE: If the calibration procedure is unsuccessful, the CCU will sound a warning for approximately 0.8 seconds and fully lower the window.

OPERATION

Front Door Windows

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) provides a constant battery feed to the window lift relay (C0587) on an NW wire. Fusible link 4 (C0574) also provides a constant battery feed to the Central Control Unit (CCU) (C0592) on an NW wire. The CCU is mounted directly onto the rear of the passenger compartment fuse box.

Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 8 of the passenger compartment fuse box (C0588) on a G wire. Fuse 8 provides an ignition feed to the CCU (C0593).

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DESCRIPTION AND OPERATION

Window Lift Relay

The earth path for the window lift relay coil is controlled by the CCU (C0593). When the CCU (C0593) receives an 'ignition on' feed from fuse 8 of the passenger compartment fuse box, it will energise the window lift relay. The energised window lift relay provides a feed to fuse 33 and fuse 34, which are also located in the passenger compartment fuse box.

Driver Door Window – LHD Vehicles

Fuse 33 of the passenger compartment fuse box (C0586) provides a feed to the driver door window switch (C0321) and the window lift ECU (C0341) on RG wires. The window lift ECU (C0341) is earthed on a B wire.

When the driver door window switch is pressed to lower the window, current flows across the switch (C0321) to the window lift ECU (C0341) on an OG wire. The window lift ECU (C0341) now provides a feed to the driver door window lift motor (C0326) on an R then OR wire. Current flows across the motor (C0326) back to the window lift ECU (C0341) on an OU then U wire. The window lift ECU (C0341) is provided an earth path via the driver door window switch (C0321) on an OY wire.

The driver door window switch (C0321) is earthed on a B wire. The window will now move to the fully lowered position.

When the driver door window switch is pressed to raise the window, current flows across the switch (C0321) to the window lift ECU (C0341) on an OY wire. The window lift ECU (C0341) now provides a feed to the driver door window lift motor (C0326) on a U then OU wire. Current flows across the motor (C0326) back to the window lift ECU (C0341) on an OR then R wire. The window lift ECU (C0341) is provided an earth path via the driver window switch (C0321) on an OG wire.

The driver door window switch (C0321) is earthed on a B wire. The window will now move to the fully raised position.

Driver Door Window – RHD Vehicles

Fuse 34 of the passenger compartment fuse box (C0586) provides a feed to the driver door window switch (C0242) and the window lift ECU (C0341) on SO wires. The window lift ECU (C0341) is earthed on a B wire.

When the driver door window switch is pressed to lower the window, current flows across the switch (C0242) to the window lift ECU (C0341) on an OG wire. The window lift ECU (C0341) now provides a feed to the driver door window lift motor (C0326) on an R then OR wire. Current flows across the motor (C0326) back to the window lift ECU (C0341) on an OU then U wire. The window lift ECU (C0341) is provided an earth path via the driver door window switch (C0242) on an OY wire.

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DESCRIPTION AND OPERATION

The driver door window switch (C0242) is earthed on a B wire. The window will now move to the fully lowered position.

When the driver door window switch is pressed to raise the window, current flows across the switch (C0242) to the window lift ECU (C0341) on an OY wire. The window lift ECU (C0341) now provides a feed to the driver door window lift motor (C0326) on a U then OU wire. Current flows across the motor (C0326) back to the window lift ECU (C0341) on an OR then R wire. The window lift ECU (C0341) is provided an earth path via the driver door window switch (C0242) on an OG wire.

The driver door window switch (C0242) is earthed on a B wire. The window will now move to the fully raised position.

Front Passenger Door Window – LHD Vehicles

Fuse 34 of the passenger compartment fuse box (C0586) provides a feed to the front passenger door window switch (C0242) on an SO wire.

When the passenger door window switch is pressed to lower the window, current flows across the switch (C0242) to the passenger door window lift motor (C0326) on an OR wire. Current flows across the motor (C0326) and back to the passenger door window switch (C0242) on an OU wire. The motor is provided an earth path via the passenger door window switch (C0242) on a B wire. The passenger door window will now move downwards until the switch is released.

When the passenger door window switch is pressed to raise the window, current flows across the switch (C0242) to the passenger door window lift motor (C0326) on an OU wire. Current flows across the motor (C0326) and back to the passenger door window switch (C0242) on an OR wire. The motor is provided an earth path via the passenger door window switch (C0242) on a B wire. The passenger door window will now move upwards until the switch is released.

Front Passenger Door Window – RHD Vehicles

Fuse 33 of the passenger compartment fuse box (C0586) provides a feed to the front passenger door window switch (C0321) on an RG wire.

When the passenger door window switch is pressed to lower the window, current flows across the switch (C0321) to the passenger door window lift motor (C0326) on an R then OR wire. Current flows across the motor (C0326) and back to the passenger door window switch (C0321) on an OU then U wire. The motor is provided an earth path via the passenger door window switch (C0321) on a B wire. The passenger door window will now move downwards until the switch is released.

FREELANDER 03MY 4.15

Page 41

DESCRIPTION AND OPERATION

When the passenger door window switch is pressed to raise the window, current flows across the switch (C0321) to the passenger door window lift motor (C0326) on a U then OU wire. Current flows across the motor (C0326) and back to the passenger door window switch (C0321) on an OR then R wire. The motor is provided an earth path via the passenger door window switch (C0321) on a B wire. The passenger door window will now move upwards until the switch is released.

NOTE: The driver door window lift motor and the passenger door window lift motor have the same connector numbers as they utilise the same harness.

Rear Door Windows

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) provides a constant battery feed to the window lift relay (C0587) on an NW wire. The window lift relay is located in the passenger compartment fuse box. Fusible link 4 (C0574) also provides a constant battery feed to the Central Control Unit (CCU) (C0593) and the auxiliary relay on an NW wire. The CCU is mounted directly onto the rear of the passenger compartment fuse box.

Auxiliary Relay

In addition to controlling operation of the electric sunroof, the auxiliary relay also controls operation of the rear electric windows. The earth path for the auxiliary relay coil is controlled by the CCU. When the CCU (C0593) receives an 'ignition on' feed from fuse 8 of the passenger compartment fuse box, it will energise the auxiliary relay. The energised auxiliary relay provides a feed to fuse 26 and fuse 27, which are also located in the passenger compartment fuse box.

LH Rear Window

Fuse 26 of the passenger compartment fuse box (C0585) provides a feed to the console mounted LH rear window switch (C0264) on a WK wire.

When the LH rear console switch is pressed to lower the window, current flows across the switch (C0264) to the door mounted switch (C0732) on a GR then WR wire. The door mounted switch (C0732) now provides a feed to the window lift motor (C0304) on an R wire. Current flows across the motor (C0304) and back to the door mounted switch (C0732) on a U wire. The door mounted switch (C0732) is provided an earth path via the console mounted switch (C0264) on a WU then GU wire.

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DESCRIPTION AND OPERATION

The console mounted switch (C0264) is earthed on a B wire. The window will now move downwards until the switch is released.

When the LH rear console switch is pressed to raise the window, current flows across the switch (C0264) to the door mounted switch (C0732) on a GU then WU wire. The door mounted switch (C0732) now provides a feed to the window lift motor (C0304) on a U wire. Current flows across the motor (C0304) and back to the door mounted switch (C0732) on an R wire. The door mounted switch (C0732) is provided an earth path via the console mounted switch (C0264) on a WR then GR wire.

The console mounted switch (C0264) is earthed on a B wire. The window will now move upwards until the switch is released.

RH Rear Window

Fuse 27 of the passenger compartment fuse box (C0586) provides a feed to the console mounted RH rear window switch (C0263) on a WN wire.

When the RH rear console switch is pressed to lower the window, current flows across the switch (C0263) to the door mounted switch (C0732) on a WR wire. The door mounted switch (C0732) now provides a feed to the window lift motor (C0304) on an R wire. Current flows across the motor (C0304) and back to the door mounted switch (C0732) on a U wire. The door mounted switch (C0732) is provided an earth path via the console mounted switch (C0264) on a WU wire.

The console mounted switch (C0263) is earthed on a B wire. The window will now move downwards until the switch is released.

When the RH rear console switch is pressed to raise the window, current flows across the switch (C0263) to the door mounted switch (C0732) on a WU wire. The door mounted switch (C0732) now provides a feed to the window lift motor (C0304) on a U wire. Current flows across the motor (C0304) and back to the door mounted switch (C0732) on an R wire. The door mounted switch (C0732) is provided an earth path via the console mounted switch (C0264) on a WR wire.

The console mounted switch (C0263) is earthed on a B wire. The window will now move upwards until the switch is released.

NOTE: Both rear door window lift motors, and both rear door mounted switches have the same connector numbers as they utilise the same harness.

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DESCRIPTION AND OPERATION

Tail Door Window

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 14 and fuse 31 of the passenger compartment fuse box (C0587) by an NW wire. Fuse 31 (C0583) provides a constant battery feed to the tail door window lift relay (C0043) on a PN wire. Fuse 14 (C0583) provides a constant battery feed to the roof on switch (3 door vehicles only) (C0497) on a P wire.

Fusible link 4 (C0574) also provides a constant battery feed to the Central Control Unit (CCU) (C0593), via the passenger compartment fuse box (C0587) on an NW wire. The CCU (C0593) is earthed via the passenger compartment fuse box (C0587) on a B wire.

Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch to fuse 8 of the passenger compartment fuse box (C0588) on a G wire. Fuse 8 provides an ignition feed to the CCU (C0593).

Tail Door Wiper Motor

The CCU will not operate the tail door window if the rear wiper is operational. The CCU (C0428) monitors the condition of the rear wiper by providing a feed to the 'off screen' park switch (C0388) on an OB wire. The 'off screen' park switch is open circuit at all times except when the rear wiper is in the park position. When the wiper is in the park position, current flows across the switch contacts (C0388) to earth on a B wire. The CCU will only operate the tail door window when it registers this earth path.

The CCU (C0428) also monitors the position of the rear wiper by providing a feed to the 'on screen' switch (C0388) on an NG wire. The 'on' screen switch is open circuit at all times except when the rear wiper is at the top of its travel. At this point, the switch contacts close, and an earth path is created on a B wire.

NOTE: The rear wiper will not operate if the tail door glass has not been calibrated.

For more information on rear wiper operation, refer to the Wipers and Washers section of this manual.

+ WIPERS AND WASHERS.

4.18 FREELANDER 03MY

Page 44

DESCRIPTION AND OPERATION

Roof On Switch (3 Door Vehicles Only)

The roof on switch (C0497) is located on the RH 'D' post, and is provided a constant battery feed by fuse 14 of the passenger compartment fuse box (C0583) on a P wire. The roof on switch is closed when the hard back is fitted, or the soft back is in the fitted position. In this instance current flows across the switch (C0497) to the CCU (C0428) on a PY wire.

If the hard back is removed (or the soft back is folded down) the roof on switch becomes open circuit, and the feed to the CCU is removed. The CCU will now inhibit operation of the tail door window.

Tail Door Window Switch

The tail door window switch is located on the centre console. The CCU (C0428) provides feeds to the switch (C0354) on a BR wire and a BK wire. When the switch is moved to the down position, current supplied to the switch on the BR wire flows across the closed switch contacts to earth on a B wire. When the CCU registers this earth, it powers the tail door window down.

When the switch is moved to the up position, current supplied by the CCU on the BK wire flows across the closed switch contacts to earth on a B wire. When the CCU registers this earth, it powers the tail door window up.

When up operation of the tail door window is requested, the CCU (C0429) provides a feed to the window lift relay module (C0043) on an RU wire. The relay module (C0043) is now able to provide a feed to the window motor (C0612) on a UB wire. Current flows across the motor windings (C0612) and back to the relay module (C0043) on a UG wire. The relay module (C0043) is earthed on a B wire.

Down

When down operation of the tail door window is requested, the CCU (C0429) provides a feed to the window lift relay module (C0043) on an RG wire. The relay module (C0043) is now able to provide a feed to the window motor (C0612) on a UG wire. Current flows across the motor windings (C0612) and back to the relay module (C0043) on a UB wire. The relay module (C0043) is earthed on a B wire.

Tail Door Window Motor

The CCU needs to know the position of the tail door window at all times (see Description). To do this, the CCU (C0429) provides a feed to a hall effect sensor located within the tail door window motor (C0612) on an SP wire. The sensor (C0612) is provided an earth by the CCU (C0430) on a KB wire. The hall effect sensor (C0612) provides a signal feed to the CCU (C0429) on an SR wire, informing it of the position of the tail door window.

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DESCRIPTION AND OPERATION

Tail Door Open Switch

The CCU (C0428) monitors the condition of the tail door exterior handle by providing a feed to the tail door open switch (C0615) on an N wire. When the tail door handle is operated, current flows across the switch (C0615) to earth on a B wire. When the CCU registers this earth, it delays opening the tail door and lowers the tail door window approximately 17 mm.

The CCU (C0428) also monitors the condition of the tail door barrel switch (C0615) on a US wire. When the key is turned inside the barrel, current flows across the switch (C0615) to earth on a B wire. If the CCU registers a continuous earth path for approximately 2 seconds, it will lower the tail door glass.

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DESCRIPTION AND OPERATION

SUNROOF

DESCRIPTION

General

An electrically operated sunroof is fitted to 5 door vehicles only. The sunroof will only operate when the ignition switch is in the 'ignition' position, and is controlled via a non-latching rocker switch mounted on the centre console.

When the upper half of the switch is pressed and held, the sunroof will move to its tilt position. When the lower half of the switch is pressed and held, the sunroof will return to its closed position. If the lower half of the switch is pressed and held while the sunroof is in its fully closed position, the sunroof will slide to its fully open position. The sunroof is closed by pressing the upper half of the switch.

OPERATION

General

NOTE: The auxiliary relay also controls operation of the heated seats.

Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 8 of the passenger compartment fuse box (C0588) on an NW wire. Fuse 8 provides an ignition feed to the Central Control Unit (CCU) (C0593). The CCU is mounted directly onto the rear of the passenger compartment fuse box.

When the CCU receives an ignition feed from fuse 8, it energised the auxiliary relay by providing an earth path for the relay coil. The energised auxiliary relay provides a feed to fuse 12, which is also located in the passenger compartment fuse box. Fuse 12 (C0585) provides a feed to the sunroof switch (C0363) on an SR wire.

Open

When the bottom half of the sunroof switch is depressed (with the sunroof in the fully closed position), a feed is provided to the sunroof motor (C0614) from the switch (C0363) on a G wire. Current flows across the motor (C0614) and back to the switch (C0363) on an S wire. The switch (C0363) is earthed on a B wire. The motor will now power the sunroof back to the fully open position.

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DESCRIPTION AND OPERATION

When the top half of the sunroof switch is depressed (with the sunroof in the fully open position), a feed is provided to the sunroof motor (C0614) from the switch (C0363) on an S wire. Current flows across the motor (C0614) and back to the switch (C0363) on a G wire. The switch (C0363) is earthed on a B wire. The motor will now power the sunroof back to the fully closed position.

Tilt

When the top half of the sunroof switch is depressed (with the sunroof in the fully closed position), a feed is provided to the sunroof motor (C0614) from the switch (C0363) on an S wire. Current flows across the motor (C0614) and back to the switch (C0363) on a G wire. The switch (C0363) is earthed on a B wire. The motor will now power the sunroof to the tilt position.

When the bottom half of the switch is depressed (with the sunroof in the tilt position), a feed is provided to the sunroof motor (C0614) from the switch (C0363) on a G wire. Current flows across the motor (C0614) and back to the switch (C0363) on an S wire. The switch (C0363) is earthed on a B wire. The motor will now power the sunroof back to the fully closed position.

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DESCRIPTION AND OPERATION

DOOR MIRRORS

DESCRIPTION

General

The electrically operated door mirrors are controlled via the multi-directional switch mounted on the fascia adjacent the instrument pack. Rotating the switch to the left, allows movement of the LH door mirror. A movement in the switch position will now be replicated by the LH door mirror. Rotating the switch to the right allows movement of the RH door mirror in the same way. The central switch position inhibits operation of both door mirrors.

Both mirrors also feature a heating element. The heating elements operate automatically when the ignition switch is in the 'ignition' position, and are not controllable by the driver.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) provides a constant battery feed to the window lift relay (C0587) and the CCU (C0592) on an NW wire. The window lift relay is controlled by the CCU, which is mounted directly onto the rear of the passenger compartment fuse box. When energised, the window lift relay provides a feed to fuse 17, which is also located in the passenger compartment fuse box.

LH Door Mirror

Fuse 17 of the passenger compartment fuse box (C0589) provides a feed to the door mirror switch (C0066) on a G wire. When the door mirror switch is turned to the LH mirror position, it provides feeds and earth paths to the vertical and horizontal motors as follows:

When the door mirror switch is moved upwards, it provides a feed to the LH vertical motor (C0319) on a BY then BP wire. Current flows across the motor (C0319) and back to the switch (C0066) on an SW wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror upwards until the switch is released, or it reaches the end of its travel.

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DESCRIPTION AND OPERATION

Down

When the door mirror switch is moved downwards, it provides a feed to the LH vertical motor (C0319) on an SW wire. Current flows across the motor (C0319) and back to the switch (C0066) on a BP then BY wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror downwards until the switch is released, or it reaches the end of its travel.

Left

When the door mirror switch is moved to the left, it provides a feed to the LH horizontal mirror (C0319) on an SW wire. Current flows across the motor (C0319) and back to the switch (C0066) on a BN then BU wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror left until the switch is released, or it reaches the end of its travel.

Right

When the door mirror switch is moved to the right, it provides a feed to the LH horizontal mirror (C0319) on a BU then BN wire. Current flows across the motor (C0319) and back to the switch (C0066) on an SW wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror right until the switch is released, or it reaches the end of its travel.

RH Door Mirror

Fuse 17 of the passenger compartment fuse box (C0589) provides a feed to the door mirror switch (C0066) on a G wire. When the door mirror switch is turned to the RH mirror position, it provides feeds and earth paths to the vertical and horizontal motors as follows:

When the door mirror switch is moved upwards, it provides a feed to the RH vertical motor (C0319) on a BP wire. Current flows across the motor (C0319) and back to the switch (C0066) on an SW wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror upwards until the switch is released, or it reaches the end of its travel.

Down

When the door mirror switch is moved downwards, it provides a feed to the RH vertical motor (C0319) on an SW wire. Current flows across the motor (C0319) and back to the switch (C0066) on a BP wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror downwards until the switch is released, or it reaches the end of its travel.

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DESCRIPTION AND OPERATION

Left

When the door mirror switch is moved to the left, it provides a feed to the RH horizontal mirror (C0319) on an SW wire. Current flows across the motor (C0319) and back to the switch (C0066) on a BN wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror left until the switch is released, or it reaches the end of its travel.

Right

When the door mirror switch is moved to the right, it provides a feed to the RH horizontal mirror (C0319) on a BN wire. Current flows across the motor (C0319) and back to the switch (C0066) on an SW wire. The switch (C0066) provides the motor an earth path on a B wire. The motor will move the mirror right until the switch is released, or it reaches the end of its travel.

NOTE: Both the LH and RH door mirror motors have the same connector number as they utilise the same harness.

Door Mirror Heater Elements

Fuse 1 of the passenger compartment fuse box (C0581) provides an ignition feed to the LH and RH door mirror heater elements (C0319) on NG wires. The heater elements (C0319) are earthed on B wires.

NOTE: Both the LH and RH door mirror heater elements have the same connector number as they utilise the same harness.

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DESCRIPTION AND OPERATION

FOLDING DOOR MIRRORS

DESCRIPTION

General

Certain markets are fitted with folding door mirrors. When the centre of the multi-directional mirror switch is pressed, both door mirrors move to the folded position simultaneously. Pressing the switch a second time returns the mirrors to their original position.

For more information on door mirror operation, refer to the Door Mirrors section of this manual.

+ DOOR MIRRORS.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the passenger compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) provides a feed to the window lift relay and fuse 14 of the passenger compartment fuse box (C0587) on an NW wire. Fusible link 4 (C0574) also provides a feed to the CCU (C0592) on an NW wire.

Folding Mirror ECU

Fuse 14 of the passenger compartment fuse box (C0583) provides a constant battery feed to the folding mirror ECU (C0907) on a P then NS wire. The folding mirror ECU is located at the base of the passenger side 'A' post, and is earthed on a B wire.

The folding mirror ECU (C0907) monitors the condition of the door mirror switch (C0066) on a UB wire. When the switch is pressed, a momentary earth path is created on a B wire via the door mirror switch (C0066) and the passenger compartment fuse box (C0589 & C0587) on a B wire. When the folding mirror ECU senses this earth, it powers both folding mirror motors.

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DESCRIPTION AND OPERATION

Door Mirrors

When the folding mirror ECU senses the door mirror switch has been pressed, it provides a feed to the LH folding mirror motor (C0444) on a Y then R wire, and the RH folding mirror motor (C0444) on a Y then B wire. Current flows across the motors (C0444) and back to the folding mirror ECU on a B then O wire (LH) and an R then O wire (RH).

When the folding mirror ECU senses the door mirror switch has been pressed for a second time, it provides a feed to the LH folding mirror motor (C0444) on an O then B wire, and the RH folding mirror motor (C0444) on an O then R wire. Current flows across the motors (C0444) and back to the folding mirror ECU on an R then Y wire (LH) and a B then Y wire (RH).

NOTE: The LH and RH door mirrors have the same connector numbers as they utilise the same harness.

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DESCRIPTION AND OPERATION

HEATED SEATS

DESCRIPTION

General

The heated front seats are switched on and off by pressing either of the switches mounted on the centre console. The heated front seats are operated independently of each other. The switches also incorporate an illumination LED to show when the seat heaters are switched on.

OPERATION

General

Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 8 of the passenger compartment fuse box (C0588) on an OG wire. Fuse 8 provides an ignition feed to the CCU, which is mounted directly onto the rear of the passenger compartment fuse box.

When the CCU receives an ignition feed, it energises the auxiliary relay by providing an earth path for the relay coil. The energised auxiliary relay provides a feed to fuse 29, which is also located in the passenger compartment fuse box.

Fuse 29 (C0584) provides a feed to the LH heated seat switch (C0249) and the RH heated seat switch (C0250) on N wires.

LH Seat

When the LH heated seat switch is pressed, current flows across the switch contacts (C0249) to the LH heated seat relay (C1221) on a US then R wire. Operation of the heated seat relay (C1221) is controlled by the temperature sensor on a G wire. The temperature sensor is a normally closed switch. Current flows across the switch to earth on a G then N then B wire.

When the temperature of the seat is within acceptable levels, the heated seat relay (C1221) provides a feed to the seat heater elements on an RW wire. The elements are wired in series and earthed on an N then B wire.

If the temperature sensor detects the temperature of the seat is too high, it cuts the earth path for the heated seat relay. This de-energises the relay until seat heat temperature decreases to acceptable levels.

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DESCRIPTION AND OPERATION

RH Seat

When the RH heated seat switch is pressed, current flows across the switch contacts (C0250) to the RH heated seat relay (C1221) on a UK then R wire. Operation of the heated seat relay (C1221) is controlled by the temperature sensor on a G wire. The temperature sensor is a normally closed switch. Current flows across the switch to earth on a G then N then B wire.

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DESCRIPTION AND OPERATION

DIAGNOSTIC SOCKET

DESCRIPTION

General

The diagnostic socket is located behind the centre console, and is accessible from the drivers footwell on NAS vehicles, or the passenger footwell on all other vehicle derivatives. The socket is compliant with SAE directive J1962 standard, and allows attachment of TestBook, T4, or any other suitable diagnostic software tool. It allows detailed fault diagnosis checks to be carried out on the vehicle via an ISO 9141 K Line.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 14 of the passenger compartment fuse box (C0587) by an NW wire. Fuse 14 (C0583) provides a constant battery feed to the diagnostic socket (C0040) on a P wire.

The diagnostic socket is earthed on a pair of B wires.

The diagnostic socket (C0040) communicates with the following systems and components via the K line on K wires:

z The instrument pack (C0230). z The Central Control Unit (CCU) (C0429). z The ABS ECU (C0501). z The SRS DCU (C0256). z The cruise control ECU (KV6 ROW vehicles only) (C0239). z The Electronic Automatic Transmission Electronic Control Unit (EAT ECU) (Td4 and

KV6 vehicles only) (C0932).

z The Engine Control Module (ECM) (KV6 NAS vehicles only) (C0331). z The Engine Control Module (ECM) (KV6 ROW vehicles only) (C0371). z The ECM (K1.8 vehicles only) (C0913). z The ECM (Td4 vehicles only) (C0603). z The Fuel Burning Heater (FBH) (Td4 vehicles only) (C0925).

The diagnostic socket (C0040) also communicates with the immobilisation ECU (C0059) via the DS-2 bus on a K wire.

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DESCRIPTION AND OPERATION

CENTRAL CONTROL UNIT (CCU)

DESCRIPTION

General

For a full description of the CCU, refer to the Control Units section of the System Description and Operation Workshop manual.

OPERATION

General

For a full description of CCU operation, refer to the Control Units section of the System Description and Operation Workshop manual.

NOTE: The CCU is mounted directly onto the rear of the passenger compartment fuse box. As there is no harness connecting the passenger compartment fuse box to the CCU, connectors C0592 and C0593 are not shown in the 'Connector' section of this manual. For details on these connectors, refer to the 'Control Units' section of the System Description and Operation Workshop manual.

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DESCRIPTION AND OPERATION

CHARGING AND STARTING – Td4

DESCRIPTION

Starting

The starting system on the vehicle comprises a 12 volt starter motor which drives the engine to start the combustion process. The starter converts electrical energy into mechanical power. The vehicle electrical system must be capable of supplying sufficient power to enable the engine to be cranked.

Charging

The charging system comprises a battery and an alternator. The battery must be of a sufficient capacity to operate the starter motor and operate various electrical systems in the vehicle. The alternator charges the battery when the engine is running and increases its output as demand on the battery increases.

The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to the main relay, fusible link 1, fusible link 3, fusible link 6, and fuse 10 (C0632) on an R wire. All are located in the engine compartment fuse box. The battery (C0192) also supplies a constant feed to the starter motor solenoid (C0631) on an R wire.

Fusible link 1 is connected in series with fusible link 7, which is also located in the engine compartment fuse box.

When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.

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DESCRIPTION AND OPERATION

Starting

Main Relay

The earth path for the main relay coil (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. The energised main relay provides a feed to fuse 1 which is also located in the engine compartment fuse box. Fuse 1 (C0576) provides a feed to the glow plug relay (C0215) on an RW wire.

For a detailed description of main relay operation, refer to the Engine Management

Systems – EDC section of the System Description and Operation Workshop manual.

Inertia Switch

Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. If the inertia switch hasn't been tripped, current flows across the switch (C0123) to the fuel pump relay (C0575) on a GU wire.

The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a GU wire. For more information on the CCU, refer to the Control Units section of the Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual. + ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

Fuel Pump Relay

The fuel pump relay coil receives a feed from the energised main relay. The earth path for the relay coil (C0575) is controlled by the ECM (C0331) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 6 of the passeneger compartment fusebox (C0581) on a W wire.

The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0205) on a WP wire. The fuel pump (C0205) is earthed on a B wire.

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DESCRIPTION AND OPERATION

Glow Plug Relay

Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the ECM (C0603) on a W wire. If all criteria are met, the ECM (C0606) provides an earth path for the glow plug relay coil (C0215) on a BR wire.

Fusible link 6 of the engine compartment fuse box (C0577) provides a constant battery feed to the glow plug relay switch (C0215) on an NW wire. When the relay is energised, the switch contacts close, allowing the glow plug relay to provide a feed to the following:

z To glow plug number 1 (C0476) on a BG wire. z To glow plug number 2 (C0477) on a BP wire. z To glow plug number 3 (C0478) on a BY wire. z To glow plug number 4 (C0479) on a BR wire.

For more details of glow plug operation, refer to the Engine Management Systems – EDC section of the Workshop manual.

Starter Relay

Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch 'crank' feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on an RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A battery feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0178) on an NR then B wire.

For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.

+ ENGINE IMMOBILISATION.

Starter Motor and Starter Motor Solenoid

The starter motor solenoid coil (C0178) receives a feed from the energised starter motor relay (C0572) on an NR then B wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor.

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DESCRIPTION AND OPERATION

Central Control Unit (CCU)

The CCU (C0428) receives a feed from the inertia switch (C0123) on a GU wire. If this feed is removed due to the inertia switch being tripped, the CCU will unlock all of the doors. For more details of CCU operation, refer to the Control Units section of the Workshop manual. For more details of the Central Door Locking (CDL) system, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

NOTE: The CCU will only unlock all doors if the ignition switch is in the 'ignition' position.

The CCU (C0429) also provides a signal feed to the immobilisation ECU (C0059) on a KN wire. This signal feed informs the immobilisation ECU to energise the starter relay. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.

+ ENGINE IMMOBILISATION.

Charging

Alternator

The battery (C0192) provides a permanent feed to the alternator (C0183) via the starter motor (C0631) on an R then N wire. Fuse 19 of the passenger compartment fuse box (C0581) provides an ignition feed to the alternator (C0226) on a W then GN wire.

When the engine is turned over, the alternator (C0226) supplies the ECM (C0606) a Pulse Width Modulated (PWM) signal on a U wire. The ECM uses this PWM signal to calculate the electrical load on the alternator, and controls engine idle speed accordingly.

When the engine is started, the magnetised rotor within the stator windings generate 3 phase alternating current (ac) and voltage that rises rapidly with rotor speed. The field diodes in the rectifier pack convert the ac current into direct current (dc). Output current from the field diodes supplements the initial current flowing through the field windings. This causes an increase in the magnetic influence of the rotor, resulting in self-exitation of the alternator. The field current increases with rotor speed and thus increases the generated current and voltage until the alternator is fully excited. The alternator (C0183) charges the battery (C0192) by providing current on an N then R wire.

Ignition/No charge Warning Lamp

Fuse 8 of the passenger compartment fuse box (C0589) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a G wire. Illumination of the warning lamp (C0233) is controlled by the ECM (C0331) on an NY wire.

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DESCRIPTION AND OPERATION

CHARGING AND STARTING – K SERIES

DESCRIPTION

Starting

Charging

The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – MEMS section of the System Description and Operation Workshop manual.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, fuse 10 and the main relay (C0632) on an R wire. All are located within the engine compartment fuse box. The battery (C0192) also provides a feed to the starter motor solenoid (C0178) on an R wire.

Fusible link 1 is connected in series with fusible link 7, which is also located within the engine compartment fuse box.

When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.

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DESCRIPTION AND OPERATION

Starting

Main Relay

Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the Engine Control Module (ECM) (C0913) on a W wire. When the ECM receives this feed, it energises the main relay by providing an earth path for the relay coil (C0576) on a WK wire. The energised main relay is now able to provide a feed to the fuel pump relay. The fuel pump relay is also located in the engine compartment fuse box.

For a detailed description of main relay operation, refer to the Engine Management

Systems – MEMS section of the System Description and Operation Workshop manual.

Inertia Switch

The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a UG wire. For more information on the CCU, refer to the Control Units section of the Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

Fuel Pump Relay

The fuel pump relay coil receives a feed from the energised main relay (see above). The earth path for the relay coil (C0575) is controlled by the ECM (C0913) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 6 of the passenger compartment fuse box (C0581) on a W wire.

The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0114) on a WP wire. The pump (C0114) is earthed on a B wire.

Starter Relay

Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch 'crank' feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on a RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A battery feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0179) on an NR wire.

For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.

+ ENGINE IMMOBILISATION.

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DESCRIPTION AND OPERATION

Starter Motor and Starter Motor Solenoid

The starter motor solenoid coil (C0179) receives a feed from the energised starter motor relay (C0572) on an NR wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor.

Central Control Unit (CCU)

The CCU (C0428) receives a feed from the inertia switch (C0123) via the engine compartment fuse box (C0576) on a UG wire. If this feed is removed due to the inertia switch being tripped, the CCU will unlock all of the doors. For more details of the Central Door Locking (CDL) system, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

NOTE: The CCU will only unlock all doors if the ignition switch is in the 'ignition' position.

+ ENGINE IMMOBILISATION.

Charging

Alternator

Fusible link 1 of the engine compartment fuse box (C0826) provides a constant battery feed to the alternator (C0183) on an R wire. Fuse 19 of the passenger compartment fuse box (C0581) provides an ignition feed to the alternator (C0185) on a W wire.

When the engine is running, the alternator (C0185) supplies the ECM (C0914) with a Pulse Width Modulated (PWM) signal on a WR wire. The ECM uses the PWM signal to calculate electrical load on the alternator, and controls idle speed accordingly.

The alternator (C0183) charges the battery by providing current via fusible link 1 of the engine compartment fuse box (C0826 & C0632) to the battery positive terminal (C0192) on an R wire.

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DESCRIPTION AND OPERATION

Ignition/No Charge Warning Lamp

Fuse 8 of the passenger compartment fuse box (C0589) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a G wire. Current flows across the lamp (C0233) and is provided an earth path by the alternator (C0185) on an NY wire. The warning lamp will now illuminate.

When the alternator is charging, it provides a feed to the warning lamp (C0233) on the NY wire. Because the potential difference across the bulb is 0 V, the lamp will now extinguish.

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DESCRIPTION AND OPERATION

CHARGING AND STARTING – KV6

DESCRIPTION

Starting

Charging

The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – Siemens (All Except NAS) section of the System Description and Operation Workshop manual.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, fuse 10, and the main relay (C0632) on an R wire. All are located in the engine compartment fuse box. The battery (C0192) also provides a feed to the starter motor solenoid (C0178) on an R wire.

Fusible link 1 is connected in series with fusible link 7, which is also located in the engine compartment fuse box.

When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.

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DESCRIPTION AND OPERATION

Starting

Main Relay

Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the Engine Control Module (ECM) (C0371) on a W wire. When the ECM receives this feed, it energises the main relay by providing an earth path for the relay coil (C0578) on a WK wire. The energised main relay is now able to provide a feed to the fuel pump relay. The fuel pump relay is also located in the engine compartment fuse box.

Inertia Switch

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

Fuel Pump Relay

The fuel pump relay coil receives a feed from the energised main relay (see above). The earth path for the relay coil (C0575) is controlled by the ECM (C0371) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 6 of the passenger compartment fuse box (C0581) on a W wire.

The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0114) on a WP wire. The fuel pump (C0114) is earthed on a B wire.

Starter Relay

Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch 'crank' feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on a RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0179) on an NR wire.

For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.

+ ENGINE IMMOBILISATION.

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DESCRIPTION AND OPERATION

Starter Motor and Starter Motor Solenoid

The starter motor solenoid coil (C0179) receives a feed from the energised starter relay (C0572) on an NR wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor.

Central Control Unit (CCU)

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

NOTE: The CCU will only unlock all doors if the ignition switch is in the 'ignition' position.

+ ENGINE IMMOBILISATION.

Charging

Alternator

When the engine is turned over, the alternator (C0053) supplies the ECM (C0371) with a Pulse Width Modulated (PWM) signal on a GK wire. The ECM uses this PWM signal to calculate the electrical load on the alternator, and controls engine idle speed accordingly.

The alternator (C0183) charges the battery by providing current via fusible link 1 of the engine compartment fuse box (C0826 & C0632) to the battery positive terminal (C0192) on an R wire.

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DESCRIPTION AND OPERATION

Ignition/No Charge Warning Lamp

Fuse 8 of the passenger compartment fuse box (C0589) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a G wire. Current flows across the lamp (C0233) and is provided an earth path by the alternator (C0053) on an NY wire. The warning lamp will now illuminate.

When the alternator is charging, it provides a feed to the warning lamp (C0233) on the NY wire. Because the potential difference across the bulb is 0 V, the lamp will now extinguish.

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DESCRIPTION AND OPERATION

CHARGING AND STARTING – KV6 (NORTH AMERICA)

DESCRIPTION

Starting

Charging

The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – Siemens (NAS) section of the System Description and Operation Workshop manual.

OPERATION

General

Fusible link 1 is connected in series with fusible link 7, which is also located in the engine compartment fuse box.

When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.

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DESCRIPTION AND OPERATION

Starting

Main Relay

Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the Engine Control Module (ECM) (C0603) on a W wire. When the ECM receives this feed, it energises the main relay by providing an earth path for the relay coil (C0578) on an NG wire. The energised main relay is now able to provide a feed to the fuel pump relay. The fuel pump relay is also located in the engine compartment fuse box.

Inertia Switch

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

Fuel Pump Relay

The fuel pump relay coil receives a feed from the energised main relay (see above). The earth path for the relay coil (C0575) is controlled by the ECM (C0331) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 6 of the passenger compartment fuse box (C0581) on a W wire.

The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0114) on a WP wire. The fuel pump (C0114) is earthed on a B wire.

Starter Relay

Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch 'crank' feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on a RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0179) on an NR wire.

For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.

+ ENGINE IMMOBILISATION.

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DESCRIPTION AND OPERATION

Starter Motor and Starter Motor Solenoid

Central Control Unit (CCU)

+ ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

NOTE: The CCU will only unlock all doors if the ignition switch is in the 'ignition' position.

+ ENGINE IMMOBILISATION.

Charging

Alternator

When the engine is turned over, the alternator (C0053) supplies the ECM (C0331) with a Pulse Width Modulated (PWM) signal on a GK wire. The ECM uses this PWM signal to calculate the electrical load on the alternator, and controls engine idle speed accordingly.

The alternator (C0183) charges the battery by providing current via fusible link 1 of the engine compartment fuse box (C0826 & C0632) to the battery positive terminal (C0192) on an R wire.

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DESCRIPTION AND OPERATION

Ignition/No Charge Warning Lamp

Fuse 8 of the passenger compartment fuse box (C0589) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a G wire. Current flows across the lamp (C0233) and is provided an earth path by the alternator (C0053) on an NY wire. The warning lamp will now illuminate.

When the alternator is charging, it provides a feed to the warning lamp (C0233) on the NY wire. Because the potential difference across the bulb is 0 V, the lamp will now extinguish.

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DESCRIPTION AND OPERATION

CRUISE CONTROL – TD4 & KV6 (NORTH AMERICA)

DESCRIPTION

General

Cruise control is switched on by pressing the cruise control master switch mounted on the centre console. The 'Set +' and 'Res' switches mounted on the steering wheel allow the driver to either set the vehicle speed as required or resume the last cruising speed set.

The cruise control system uses mechanical, electrical and vacuum operated devices to maintain vehicle speed at a setting selected by the driver. As vehicle speed changes due to changes in road gradients, so the cruise control ECU operates the cruise control pump, continually moving the cruise control actuator to maintain the set vehicle speed.

Should the driver wish to increase the speed of the vehicle, the 'Set +' switch should be pressed and held. The vehicle will accelerate until the switch is released. As the 'Set +' switch is released, the cruise control ECU will store the new cruise speed in its memory.

With cruise control switched on, it is possible to press the accelerator pedal and accelerate through the memorised set speed. When the accelerator is released, the cruise control ECU will automatically return the vehicle to its set speed.

Note: The cruise control system will only operate between speeds of 22 mph (35 kph) and 125 mph (201 kph).

Cruise control operation can be suspended by one of the following ways:

z By pressing the 'Res' switch. z By pressing the brake pedal. z The gearbox is placed in park, neutral, or reverse. z Hill Descent Control (HDC) is active. z Engine rev's are too high.

Under all these conditions, the cruise control set speed will be memorised. Cruise control operation can be resumed by pressing the 'Res' switch.

Cruise control operation can be cancelled in one of two ways:

z By pressing the cruise control master switch located on the centre console. z By switching the ignition off.

In both these cases, the cruise control set speed will be lost.

Warning: Do not switch off the vehicle ignition unless the vehicle is stationary and the handbrake is applied.

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DESCRIPTION AND OPERATION

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to the main relay, the horn relay, and fusible link 3 (C0632) on an R wire. All are located in the engine compartment fuse box.

The earth path for the main relay (C0578) is controlled by the ECM (C0604) on an NG wire. The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. For more information on main relay operation, refer to the Engine Management System – EDC or Engine Management System – Siemens (NAS) section of the System Description and Operation Workshop manual.

Cruise Control Master Switch

Cruise control is switched on and off by pressing the master switch mounted on the centre console. Fuse 35 of the passenger compartment fuse box (C0580) supplies the cruise control master switch (C0749) an ignition feed on a W wire. When the switch is pressed, current flows across the switch contacts (C0749) to the cruise control interface unit (C1959) on a WY wire.

NOTE: When the cruise control system is switched off using the master switch, any stored road speed values will be lost.

Cruise Control Interface Unit

Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the cruise control interface unit (C1959) on an NK wire. The interface unit (C1959) is earthed on a B wire. To enable it to control the cruise control system, the ECU receives a number of inputs from various sources as follows:

ABS ECU

The ABS ECU (C0501) provides a road speed signal to the cruise control interface unit (C1959) via the CAN-BUS on YN (Low) and YB (High) wires. For more information on the CAN-BUS road speed signal, refer to the Communication Databuses section of the System Description and Operation Workshop manual.

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DESCRIPTION AND OPERATION

Set + Switch

A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. The 'Set +' switch is a normally open, non-latching switch. When the switch is pulled forward, the switch contacts close. Current flows across the switch back to the rotary coupler. The rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by an RW wire.

The interface unit (C1959) converts the signals received from the 'Set +' switch, and relays information to the Engine Control Module (ECM) (C0331) on an RG wire. The signal provided by the interface unit is a continuous, pulsed voltage, varying from approximately 6 V to 8 V. By measuring the frequency of the pulses, the ECM is able to control vehicle speed in accordance to requests from the 'Set +' switch.

Res switch

A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. The 'Res' switch is a normally open, non-latching switch. When the switch is pulled forward, the switch contacts close. Current flows across the switch back to the rotary coupler. The rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by a UW wire.

The interface unit (C1959) converts the signals received from the 'Res' switch, and relays information to the ECM (C0331) on an RG wire. The signal provided by the interface unit is a continuous, pulsed voltage, varying from approximately 6 V to 8 V. By measuring the frequency of the pulses, the ECM is able to control vehicle speed in accordance to requests from the 'Res' switch.

Brake Pedal Switch

Fuse 35 of the passenger compartment fuse box (C0580) provides an ignition feed to the hall effect brake pedal switch (C0652) on a W wire. The brake pedal switch (C0652) is earthed on a B wire.

When the brake pedal is in the rest position, only a nominal voltage (between approximately 0V and 2V) is supplied to the ECM (C0331) on GR and PG wires. When the brake pedal is pressed, this voltage rises to between approximately 6V and battery voltage. Sensing this increase, the ECM suspends cruise control operation.

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DESCRIPTION AND OPERATION

Electronic Automatic Transmission (EAT) ECU

When cruise control is active, the cruise control interface unit (C1959) provides a feed to the EAT ECU (C0932) on a WU wire. When the EAT ECU receives this feed, it enters its cruise control mode. For more information on EAT operation, refer to the Electronic Automatic Transmission (EAT) section of this manual.

+ ELECTRONIC AUTOMATIC TRANSMISSION (EAT).

Instrument Pack

When cruise control is operational, the cruise control interface unit (C1959) sends a 'cruise active' message to the instrument pack (C0230) via the CAN-BUS on YN (low) and YB (high) wires. This message is used to illuminate the cruise control lamp housed within the instrument pack.

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DESCRIPTION AND OPERATION

CRUISE CONTROL – KV6

DESCRIPTION

General

Note: The cruise control system will only operate between speeds of 22 mph (35 km/h) and 125 mph (200 km/h).

Cruise control operation can be suspended by one of the following ways:

z By pressing the 'Res' switch. z By pressing the brake pedal. z The gearbox is placed in park, neutral, or reverse. z Hill Descent Control (HDC) is active. z Engine rev's are too high.

Under all these conditions, the cruise control set speed will be memorised. Cruise control operation can be resumed by pressing the 'Res' switch.

Cruise control operation can be cancelled in one of two ways:

z By pressing the cruise control master switch located on the centre console. z By switching the ignition off.

In both these cases, the cruise control set speed will be lost.

Warning: Do not switch off the vehicle ignition unless the vehicle is stationary and the handbrake is applied.

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DESCRIPTION AND OPERATION

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to the horn relay and fusible link 3 of the engine compartment fuse box (C0632) on an R wire. Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 35 of the passenger compartment fuse box (C0588) on a G wire. Fuse 35 (C0580) provides an ignition feed to the following:

z The cruise control master switch (C0749) on a W then WK wire. z The cruise control interface unit (C1959) on a W wire (via header 292). z The brake pedal sensor (C0652) on a W wire (via header 292).

The ignition switch (C0028) also provides a feed to fuse 2 of the passenger compartment fuse box (C0588) on an NW wire. Fuse 2 (C0580) provides an ignition feed to the brake pedal switch (C0075) on a G wire.

Cruise Control Master Switch

The cruise control master switch (C0749) is mounted in the centre console and is provided an ignition feed from fuse 35 of the passenger compartment fuse box (C0580) on a W then WK wire. When the switch is pressed, current flows across the switch contacts (C0749) to the cruise control interface unit (C1959) and the cruise control ECU (C0239) on WY wires.

NOTE: When the cruise control system is switched off using the master switch, any stored road speed values will be lost.

Cruise Control ECU

When cruise control is activated, the cruise control ECU (C0239) receives a feed from the cruise control master switch (C0749) on a WY wire. The ECU (C0239) is earthed on a B wire. To enable it to control the cruise control system, the ECU receives a number of inputs from various sources as follows:

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DESCRIPTION AND OPERATION

ABS ECU

The ABS ECU (C0501) provides a pulsed wheel speed signal to the cruise control ECU (C0239) on a WO wire. The rate of pulses provided by the ABS ECU increases by 2.22 Hz for every mile per hour speed increase (approximately 8,000 pulses per mile travelled). This enables the cruise control ECU to calculate the road speed of the vehicle. If vehicle speed is outside the operating limits (see Description), the cruise control ECU will not activate the system.

NOTE: If the Cruise Control ECU fails to receive a pulsed wheel speed signal from the ABS modulator, cruise control will not operate.

For more information on ABS ECU operation, refer to the Anti-lock Braking System (ABS) section of this manual.

+ ANTI-LOCK BRAKING SYSTEM (ABS).

Set + Switch

The non latching Set + switch (C1254) is provided a feed via the horn relay (C0576) on a PY wire. When the switch is pulled back against spring pressure, the switch contacts close and a feed is provided to the cruise control ECU (C0239) via the rotary coupler (C0082) on a RW wire.

If cruise control is active, and the switch is operated for the first time, the cruise control ECU will store the current vehicle speed in its memory and maintain that speed.

NOTE: The cruise control ECU will only store and maintain the vehicle speed if it is within the operating limits given in the 'Description' section above.

If the switch is tapped a second time, the ECU will increase the vehicle speed by 1 mph. If the switch is pulled back and held against spring pressure, the vehicle will accelerate until the switch is released. The final vehicle speed in both instances will be stored in the cruise control ECU memory.

Res Switch

The non latching Res switch (C1254) is provided a feed via the horn relay (C0576) on a PY wire. When the switch is pulled back against spring pressure, the switch contacts close and a feed is provided to the cruise control ECU (C0239) via the rotary coupler (C0082) on a UW wire.

If the Res switch is pulled back against spring pressure, the cruise control ECU will alter vehicle speed to reflect the vehicle speed held within its memory. If the Res switch is pulled back for a second time, cruise control operation will be suspended

NOTE: If a road speed value is not held within the cruise control ECU memory, the ECU will not respond to the Res switch input. To enter a vehicle speed into the ECU memory, refer to the 'Set + Switch' section above.

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DESCRIPTION AND OPERATION

Brake Pedal Sensor

The Hall effect brake pedal sensor (C0652) is provided an ignition feed from fuse 35 of the passenger compartment fuse box (C0580) on a W wire. The sensor (C0652) is earthed on a B wire. When the brake pedal is in its normal position, the sensor provides the cruise control interface unit (C1959) a low voltage (between approximately 0V and 2V) on a PG wire. When the brake pedal is pressed, this voltage rises to between approximately 6V and battery voltage. When the interface unit registers this rise in voltage, it suspends cruise control operation.

The brake pedal sensor (C0652) also provides a brake pedal status signal to the cruise control interface unit (C1959) on a GR wire.

Interface Unit

The interface unit (C1959) provides a feed to the cruise control ECU (C0239) on a PG wire if the following conditions exist:

z The cruise control master switch is depressed. z The brake pedal is not depressed. z HDC is not activated. z The gear selector lever is not in the park, neutral, or reverse positions. z Engine speed is below 6,496 rpm.

The cruise control ECU uses the feed provided by the interface unit to enable the cruise control pump. For more details on interface unit operation, refer to the Interface Unit section below.

Interface Unit

Fuse 35 of the passenger compartment fuse box (C0580) provides an ignition feed to the interface unit (C1959) on a W wire. The interface unit is earthed on a pair of B wires, and receives inputs from a number of different components as follows:

Cruise Control Master Switch

When the cruise control master switch is depressed, it provides a feed to the interface unit (C1959) on a WY wire.

Brake Pedal Sensor

When the brake pedal is in its normal position, the sensor (C0652) provides the interface unit (C1959) a low voltage (between approximately 0V and 2V) on GR and PG wires. When the brake pedal is pressed, this voltage rises to between approximately 6V and battery voltage.

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DESCRIPTION AND OPERATION

Engine Control Module (ECM)

The ECM (C0371) provides a feed to the interface unit (C1959) on a BU wire if the following conditions exist:

z HDC is not activated. z The gear selector lever is not in the park, neutral, or reverse positions. z Engine speed is below 6,496 rpm.

For more information on the Siemens ECM, refer to the Engine Management Systems – Siemens section of the System Description and Operation Workshop manual.

Cruise Control Pump

When all conditions for cruise control activation have been met, the cruise control ECU (C0239) provides a feed to the cruise control pump motor (C0228) on a WU wire. The pump motor creates a vacuum in the pump actuator. For a detailed description of actuator operation, refer to the Engine Management Systems – Siemens section of the Workshop manual.

Current flow across the pump motor is controlled by the ECU (C0239) providing a varying Pulse Width Modulated (PWM) signal to the other side of the pump motor (C0228) on a BR wire. When the correct vehicle speed has been reached, the ECU (C0239) replaces the PWM feed with a continuous feed. As the potential difference across the pump motor is now 0V, the pump motor stops operating.

To maintain the vacuum in the actuator, both the control and dump valves are closed by the ECU. To close the valves, the ECU (C0239) provides a feed to the control and dump valves (C0228) on a WU wire. Current flows across the control valve (C0228) to the ECU (C0239) on a PY wire. Current flows across the dump valve (C0228) to the ECU (C0239) on a BR wire.

NOTE: Both the control valve and the dump valve are normally open valves.

When a decrease in speed is requested, the control valve is opened to reduce the depression within the actuator. This is done by the ECU (C0239) providing a PWM signal to the control valve (C0228) on a PY wire. When the correct speed has been achieved, the PWM signal is withdrawn.

When cruise is cancelled, the ECU (C0239) withdraws the feed to the dump valve (C0228) on a WU wire. The dump valve now opens, allowing atmospheric pressure into the actuator.

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DESCRIPTION AND OPERATION

Brake Pedal Switch

As a safety feature, the dump valve is opened if the brake pedal is depressed. If cruise control is active and the brake pedal is pressed, the brake pedal switch (C0075) provides a feed to the dump valve (C0228) on a GP wire. As the potential difference across the valve is 0V, the valve opens allowing atmospheric pressure into the actuator.

Electronic Automatic Transmission (EAT) ECU

When all conditions for cruise control activation have been met, the cruise control ECU (C0239) provides a feed to the EAT ECU (C0932) on a WU wire. When the EAT ECU receives this feed, it enters its cruise control mode. For more information on EAT operation refer to the Electronic Automatic Transmission (EAT) section of this manual.

+ ELECTRONIC AUTOMATIC TRANSMISSION (EAT).

Instrument Pack

When all conditions for cruise control activation have been met, the cruise control ECU (C0239) provides a feed to the cruise control LED mounted within the instrument pack (C0230) on a WU wire. The cruise control LED is provided an earth by the instrument pack (C0230) on a B wire.

Diagnostic Socket

The diagnostic socket (C0040) is connected to the cruise control ECU (C0239) by a K wire, enabling the ECU to be interrogated by TestBook or T4.

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DESCRIPTION AND OPERATION

ELECTRONIC AUTOMATIC TRANSMISSION (EAT)

DESCRIPTION

General

The Jatco 5–speed automatic transmission fitted to Freelander is controlled by an Electronic Automatic Transmission Electronic Control Unit (EAT ECU). The EAT ECU is located inside the engine E-box, and receives information from the following sources to calculate when to operate the solenoid valves contained within the gearbox to enable quick, smooth, quiet gear changes;

z The Engine Control Module (ECM) via the CAN-BUS, z The instrument pack via the CAN-BUS, z The cruise control ECU, z The automatic transmission selector, z The brake pedal switch, z The automatic gearbox sensors.

The Jatco automatic gearbox also has a number of different operating modes. When the ignition switch is first turned to the 'ignition' position, the gearbox will always revert to the 'Normal' mode. For a full description of the 5–speed automatic transmission, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to the main relay and fusible link 3 (C0632) on an R wire. Both are located in the engine compartment fuse box.

The battery also provides a feed to fusible link 4 of the engine compartment fuse box (C0632) on vehicles fitted with an instrument dimmer switch. For more information, refer to the Interior Lamps section of this manual.

+ INTERIOR LAMPS.

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DESCRIPTION AND OPERATION

Operation of the main relay (C0576 on Td4 vehicles, C0578 on KV6 vehicles) is controlled by the Engine Control Module (ECM) (C0603 on Td4 vehicles, C0604 on KV6 NAS vehicles, C0371 on KV6 ROW vehicles) on a WK wire (NG on KV6 NAS vehicles). The energised main relay allows a battery feed to flow to fuse 4 of the engine compartment fuse box. Fuse 4 (C0575) provides a feed to the following:

z The Electronic Automatic Transmission Electronic Control Unit (EAT ECU) (C0932) on

a NK wire.

z The transmission selector (C0244) (vehicles without instrument dimmer only) on a NK

then a NR wire.

z The illumination relay (C1976) (vehicles with instrument dimmer only) on a NK then a

NR wire.

z The CommandShift switch (C0410) on a NK wire.

For further details of main relay operation, refer to the Engine Management – EDC ,

Engine Management – Siemens (NAS) or Engine Management – Siemens (All Except NAS) section of the System Description and Operation Workshop manual.

Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 35 of the passenger compartment fuse box (C0588) on a G wire. Fuse 35 (C0580) provides an ignition feed to the transmission inhibit switch (C0244) on a W wire.

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DESCRIPTION AND OPERATION

EAT ECU

The EAT ECU monitors the operation of the automatic gearbox via four sensors:

z The temperature of the automatic transmission fluid (ATF) is measured by the fluid

temperature sensor. The fluid temperature sensor (C0243) receives a feed from the EAT ECU (C0932) on a WK wire. The temperature sensor return (C0243) to the EAT ECU (C0932) is via a KB wire. As the temperature of the ATF rises, so the resistance of the sensor decreases. The EAT ECU registers this drop in resistance and calculates the temperature of the ATF accordingly. For more information on the fluid temperature sensor, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.

z Vehicle speed is measured by the vehicle speed sensor. The vehicle speed sensor

(C0243) is connected to the EAT ECU (C0932) by a U wire. The speed sensor creates a sinusoidal waveform, with each positive phase of the waveform representing one tooth on the parking gear (19 per engine revolution). The EAT ECU uses this waveform to calculate vehicle speed. The sensor return (C0243) to the EAT ECU (C0932) is via a W then KB wire. For more information on the vehicle speed sensor, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.

z Input shaft speed into the gearbox is measured by the turbine sensor. The turbine

sensor (C0243) is connected to the EAT ECU (C0932) by an R wire. The turbine sensor creates a sinusoidal waveform, with 16 positive phases representing one input shaft revolution. The EAT ECU uses this signal along with a vehicle speed signal to calculate if the correct gear has been selected. The sensor return (C0243) to the EAT ECU (C0932) is via a U then KB wire. For more information on the turbine sensor, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.

z The internal, or intermediate, transmission speed is measured by the intermediate

sensor. The intermediate sensor (C0243) is connected to the EAT ECU (C0932) by an R wire. The intermediate sensor creates a sinusoidal waveform, with each positive phase of the waveform representing one tooth of the output gear (49 per revolution). The EAT ECU uses this signal to ensure the correct gear is engaged, and to monitor the amount of slip within the gearbox. The sensor return (C0243) to the EAT ECU (C0932) is via a B then KB wire. For more information on the intermediate sensor, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.

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Park

When park is selected, a main relay feed is able to flow from the transmission selector/inhibit switch (C0244) to the EAT ECU (C0932) and the selector indicator (C0675) on a KO wire. The 'P' symbol on the selector housing will now illuminate.

NOTE: On Canadian specification vehicles, a feed is also provided to the Central Control Unit (CCU) (C0593) on a KO wire. This input is used by the CCU to extinguish the daylight running lamps.

Reverse

When reverse gear is selected, a main relay feed is able to flow from the transmission selector/inhibit switch (C0244) to the reverse lamp relay (C0935) on an NG wire. The reverse lamp relay (C0935) is earthed on a B wire and controls operation of the reverse lamps. For more information on reverse lamp operation, refer to the Brake and Reverse Lamps section of this manual.

+ BRAKE AND REVERSE LAMPS.

A main relay feed is also supplied to the EAT ECU (C0932) and the selector indicator (C0675) on NG wires. The 'R' symbol on the selector housing will now illuminate.

If the vehicle is travelling forwards at greater than 6 mph (10 kph), the EAT ECU (C0932) provides a feed to the Low Coast solenoid (C0243) on a K wire. The Low Coast solenoid (C0243) is earthed via the EAT ECU (C0932) on an SB wire. When the Low Coast solenoid receives this feed, it drains the transmission fluid from the reverse clutch, thus preventing reverse gear from being selected.

Neutral

When neutral is selected, a main relay feed is able to flow from the transmission selector/ inhibit switch (C0244) to the EAT ECU (C0932) and the selector indicator (C0675) on a WU wire. The 'N' symbol on the selector housing will now illuminate.

Drive

When drive is selected, a main relay feed is able to flow from the transmission selector/ inhibit switch (C0244) to the EAT ECU (C0932) and the selector indicator (C0675) on a WB wire. The 'D' symbol on the selector housing will now illuminate.

When drive is selected, the EAT ECU (C0932) receives signals from the vehicle speed sensor (C0243) housed within the gearbox on a U wire. The sensor (C0243) is earthed via EAT ECU (C0932) on a W then KB wire. The EAT ECU (C0932) also receives a throttle pedal signal from the ECM (C0331 on Td4 and KV6 NAS vehicles, C0371 on KV6 ROW vehicles) via the CAN-BUS on YN (Low) and YB (High) wires. The EAT ECU uses this information to select the appropriate gear by operating the gearbox shift solenoids as follows:

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1st Gear

To select first gear, shift solenoid B and shift solenoid C are operated. The EAT ECU (C0932) will provide a feed to shift solenoid B (C0243) on an O wire. Shift solenoid C (C0243) receives a feed from the EAT ECU (C0932) on an OU wire.

2nd Gear

To select second gear, shift solenoid A and shift solenoid B are operated. The EAT ECU (C0932) will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid B (C0243) receives a feed from the EAT ECU (C0932) on an O wire.

3rd Gear

To select third gear, only shift solenoid B is operated. The EAT ECU (C0932) will provide a feed to shift solenoid B (C0243) on an O wire.

4th Gear

To select fourth gear, only shift solenoid C is operated. The EAT ECU (C0932) will provide a feed to shift solenoid C (C0243) on an OU wire.

5th Gear

To select fifth gear, shift solenoid A and shift solenoid C are operated. The EAT ECU (C0932) will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid C (C0243) receives a feed from the EAT ECU (C0932) on an OU wire.

When 4 is selected, a main relay feed is able to flow from the transmission selector/inhibit switch (C0244) to the EAT ECU (C0932) and the selector indicator (C0675) on an RG wire. The '4' symbol on the selector housing will now illuminate.

When 4 is selected, only the lowest 4 gears will be operable. For more information, refer to the Drive section.

When 2 is selected, a main relay feed is able to flow from the transmission selector/inhibit switch (C0244) to the EAT ECU (C0932) and the selector indicator (C0675) on an OB wire. The '2' symbol on the selector housing will now illuminate.

When 2 is selected, only the lowest 2 gears will be operable. For more information, refer to the Drive section.

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When 1 is selected, a main relay feed is able to flow from the transmission selector/inhibit switch (C0244) to the EAT ECU (C0932) and the selector indicator (C0675) on a GY wire. The '1' symbol on the selector housing will now illuminate.

When 1 is selected, only first gear will be operable. For more information, refer to the Drive section.

Mode Selection

Sport Mode

The selector lever (C0410) is provided a main relay feed via fuse 4 of the engine compartment fuse box (C0575) on an NK wire. When the lever is moved across to the 'S/M' position, the selector lever (C0410) provides a feed to the EAT ECU (C0932) on an LGK wire. The EAT ECU will now enter sport mode. In sport mode, the gearbox still operates as a conventional automatic transmission, but the unit becomes more responsive to driver demands. The selector lever (C0410) is earthed on a B wire.

The selector lever (C0410) also provides a feed to the selector indicator (C0675) on an LGK wire, illuminating the 'S/M' symbol on the selector housing.

Manual (CommandShift) Mode

When in sport mode, if the selector lever is moved to the '+' or '-' positions, the gearbox will automatically enter manual (CommandShift) mode. When the selector lever is moved to the '-' position, it provides a feed to the EAT ECU (C0932) on a GK wire. When the selector lever is moved to the '+' position, it provides a feed to the EAT ECU (C0932) on a GB wire. Manual gear changes can now be performed sequentially using the selector lever.

Cruise Control Mode – Td4

The cruise control master switch is located on the centre console, below the radio. When cruise control is activated, the cruise control interface unit (C1959) provides a feed to the EAT ECU (C0932) on a WU wire. In cruise control mode, the EAT ECU uses a dedicated gearshift map to control the gearbox and assist the cruise control ECU in maintaining the vehicle speed at the required level.

For more information on cruise control operation, refer to the Cruise Control – Td4 & KV6 (North America) section of this manual.

+ CRUISE CONTROL – TD4 & KV6 (NORTH AMERICA).

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Cruise Control Mode – KV6

The cruise control master switch is located on the centre console, below the radio. When cruise control is activated, the cruise control ECU (C0239) provides a feed to the EAT ECU (C0932) on a WU wire. In cruise control mode, the EAT ECU uses a dedicated gearshift map to control the gearbox and assist the cruise control ECU in maintaining the vehicle speed at the required level.

For more information on cruise control operation, refer to the Cruise Control – KV6 section of this manual.

+ CRUISE CONTROL – KV6.

Hill Descent Control (HDC) Mode

In HDC mode, the EAT ECU applies engine braking to assist the ABS ECU in controlling the vehicles descent. HDC mode is activated if all of the following conditions exist:

z The gear selector lever is in position '1' or 'R'. z The HDC switch is depressed. z The throttle pedal is released.

The EAT ECU (C0932) communicates with the ABS ECU (C0501) via the CAN-BUS on YB (High) and YN (Low) wires. For more information on the CAN-BUS, refer to the Communication Databuses section of the System Description and Operation Workshop manual.

Fluid Pressure Control

Fluid pressure within the automatic gearbox is controlled by the Line Pressure duty solenoid. When required, the EAT ECU (C0932) provides a Pulse Width Modulated (PWM) signal to the Line Pressure duty solenoid (C0243) on a Y wire. The solenoid (C0243) is earthed via the EAT ECU (C0932) on an SB wire. For more details on fluid pressure control, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.

Torque Converter Lock-Up

When the gearbox is in 4th or 5th gear, and the EAT ECU registers a high vehicle speed combined with a small throttle angle, the EAT ECU will lock the torque converter. This will enable maximum power to be transmitted to the road wheels. When this occurs, the EAT ECU (C0932) provides a PWM signal to the Lock-Up duty solenoid (C0243) on a U wire. The solenoid (C0243) is earthed via the EAT ECU (C0932) on an SB wire. For more details on torque converter lock-up, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.

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Shift Interlock

When the ignition switch is in the 'ignition' position and the selector lever is in the 'Park', the EAT ECU (C0932) provides a feed to the shift interlock solenoid (C0268) on a GW wire locking the selector lever in the 'Park' position. When the brake pedal is pressed, the brake pedal switch (C0652) provides a feed to the EAT ECU (C0932) on a GR wire. Sensing the brake pedal has been pressed the EAT ECU withdraws the feed to the shift interlock solenoid, releasing the selector lever.

The shift interlock solenoid (C0268) is earthed on a B wire.

Diagnostic Socket

If the EAT ECU detects a failure in an associated component, a fault code will be stored in its memory. TestBook or T4 can be used via the diagnostic socket to retrieve these fault codes to identify the cause of the failure. The diagnostic socket (C0040) is connected to the EAT ECU (C0932) by a K wire.

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ANTI-LOCK BRAKING SYSTEM (ABS)

DESCRIPTION

General

The ABS is a full time, four channel system that gives individual speed control to all four wheels to provide the vehicle with anti-lock braking (ABS), Electronic Traction Control (ETC), and Hill Descent Control (HDC). The systems are controlled by the ABS ECU, which is mounted on the rear of the ABS modulator. The ABS ECU also controls the front to rear brake balance by Electronic Braking force Distribution (EBD). This maximises vehicle stability under braking.

For a detailed description of ABS, ETC HDC, and EBD, refer to the Brakes section of the System Description and Operation Workshop manual.

The ABS modulator uses the CAN-BUS to communicate with other ECU's to enable it to control braking more efficiently. For more information on the CAN-BUS, refer to the Communication Databuses section of the System Description and Operation Workshop manual.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, fusible link 8, and fusible 11 (C0632) on an R wire. All are located in the engine compartment fuse box.

Fusible link 8 (C0574) and fusible link 11 (C0570) provide constant battery feeds to the ABS modulator (C0501) on NK and NR wires respectively. The ABS modulator (C0501) is earthed on a pair of B wires.

Fusible link 1 is connected in series with fusible link 2, which is also located in the engine compartment fuse box. Fusible link 2 (C0571) provides a feed to the ignition switch (C0028) on an NR wire. Fusible link 3 (C0571) also provides a feed to the ignition switch (C0028) on an N wire.

When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 2 of the passenger compartment fuse box (C0588) on an NW wire. When in the 'ignition' position, the ignition switch (C0028) also provides a feed to fuse 7 and fuse 35 of the passenger compartment fuse box on a G wire.

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Fuse 2 of the passenger compartment fuse box (C0580) provides an ignition feed to the brake pedal switch (C0075) and the HDC relay (C0574) on G wires. Fuse 35 (C0580) provides an ignition feed to the hill descent switch (C0365 on manual transmission vehicles, C0878 on automatic transmission vehicles), and the hill descent relay (C0571) on W wires. Fuse 7 (C0582) provides an ignition feed to the ABS ECU (C0501) on a W wire.

Wheel Speed Sensors

The ABS ECU (C0501) supplies a feed to all four wheel speed sensors as follows:

z To the LH front wheel speed sensor (C0516) on an R wire. z To the RH front wheel speed sensor (C0517) on a Y wire. z To the LH rear wheel speed sensor (C0502) on a G wire. z To the RH rear wheel speed sensor (C0503) on a W wire.

The wheel speed sensors provide the ABS ECU with a square wave form signal. By measuring the frequency of the wave form, the ABS ECU can calculate the speed of the road wheel. The sensors provide the ABS ECU (C0501) with wheel speed signals as follows:

z From the LH front wheel speed sensor (C0516) on an RB wire. z From the RH front wheel speed sensor (C0517) on a YB wire. z From the LH rear wheel speed sensor (C0502) on a GB wire. z From the RH rear wheel speed sensor (C0503) on a WB wire.

If the ABS ECU detects wheel deceleration is too great, it will initiate the ABS. If the ABS ECU detects that wheel speed is greater than vehicle speed, it will initiate ETC. If HDC is operational, the ABS ECU will control vehicle speed at 7 mph (11 km/h) by applying the brakes where necessary. For more information on ABS, ETC, and HDC, refer to the Brakes section of the System Description and Operation Workshop manual.

ABS ECU

Td4 – Manual Transmission

The ABS ECU (C0501) provides a road wheel speed signal to the Engine Control Module (ECM) (C0331) via the CAN BUS on YN (low) and YB (high) wires.

Td4 – Automatic Transmission

The ABS ECU (C0501) provides a road wheel speed signal to the Electronic Automatic Transmission Electronic Control Unit (EAT ECU) (C0932) via the CAN BUS on YN (low) and YB (high) wires.

K1.8

The ABS ECU (C0501) provides a road wheel speed signal to the Engine Control Module (ECM) (C0913) via the CAN BUS on YN (low) and YB (high) wires.

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KV6

The ABS ECU (C0501) provides a road wheel speed signal to the EAT ECU (C0932) via the CAN BUS on YN (low) and YB (high) wires. This information is relayed to the ECM (C0371) via the CAN BUS on YN (low) and YB (high) wires.

For more information on the CAN BUS, refer to the Communication Databuses section of the System Description and Operation Workshop manual.

The ABS ECU (C0501) also provides a pulsed road speed signal to the CCU (C0428) on a WO wire.

Brake Pedal Switch

The brake pedal switch is a double contact mechanical switch, mounted at the top of the brake pedal adjacent the brake pedal sensor. The switch (C0075) is provided an ignition feed from fuse 2 of the passenger compartment fuse box (C0580) on a G wire. When the brake pedal is at rest, the switch (C0075) provides a feed to the ABS ECU (C0501) on a GR wire. When the brake pedal is pressed, the switch (C0075) informs the ABS ECU (C0501) by providing a feed on a GP wire.

When the brake pedal is pressed, the switch (C0075) also provides a feed to the following on GP wires:

z The LH brake lamp (C0121). z The RH brake lamp (C0125). z The Centre High Mounted Stop Lamp (CHMSL) (C0613).

For more information on brake lamp operation, refer to the Brake and Reverse Lamps section of this manual.

+ BRAKE AND REVERSE LAMPS.

Accelerometer

The accelerometer is mounted beneath the centre console adjacent the handbrake, and provides the ABS ECU additional information regarding vehicle motion. The ABS ECU (C0501) provides a feed to the accelerometer (C1220) on a Y wire. The sensor (C1220) returns a vehicle acceleration/deceleration signal to the ABS ECU (C0501) on an R wire.

The accelerometer (C1220) is provided an earth path via the ABS ECU (C0501) on a U wire.

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Brake Fluid Level Switch

The ABS ECU (C0501) provides a feed to the brake fluid level switch (C0026) on a BW wire. The switch is closed when the correct amount of brake fluid is present in the brake fluid reservoir. The switch (C0026) is earthed on a B wire. If the brake fluid level drops below the recommended level, the switch contacts open. When the ABS ECU registers the switch opening, it informs the instrument pack to illuminate the brake fluid warning lamp via the CAN-BUS.

For more information on warning lamp operation, refer to the Instruments section of this manual.

+ INSTRUMENTS.

Hill Descent Control (HDC)

HDC Switch (Manual Transmission)

The HDC switch (C0365) is mounted on the gear lever, and informs the ABS ECU (C0501) when HDC has been selected. When HDC is selected, the switch contacts close, and a feed is provided to the ABS ECU (C0501) on a PS wire. When the ABS ECU receives this feed, it energises the HDC relay.

HDC Switch (Automatic Transmission)

The HDC switch (C0878) is mounted on the centre console, and informs the ABS ECU (C0501) when HDC has been selected. When HDC is selected, the switch contacts close, and a feed is provided to the ABS ECU (C0501) on a PS wire. When the ABS ECU receives this feed, it energises the HDC relay.

NOTE: The ABS ECU will only initiate HDC if either 1st or reverse gear are selected, and

brake temperature doesn't exceed 400

C (752 °F).

1st Gear Switch (Manual Transmission)

The 1st gear switch (C0618) is mounted in the gearbox, and informs the ABS ECU (C0501) when 1st gear has been selected. The Instrument pack (C0230) provides a feed to the switch (C0618) on an RW wire (RW then GB on K1.8 vehicles). When 1st gear is selected, the instrument pack (C0230) informs the ABS ECU (C0501) via the CAN BUS on YN (low) and YB (high) wires. The switch (C0618) is earthed on a B wire.

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DESCRIPTION AND OPERATION

HDC Relay

The HDC relay (C0575) is located in the engine compartment fuse box, and is controlled by the ABS ECU (C0501) on a BR wire. When energised, the HDC relay (C0570) provides a feed to the following on GP wires:

z The ABS ECU (C0501). z The LH brake lamp (C0121). z The RH brake lamp (C0125). z The CHMSL (C0613).

Diagnostic Socket

The diagnostic socket (C0040) is connected to the ABS ECU (C0501) by a K wire, enabling the ABS ECU to be interrogated by TestBook or T4.

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SUPPLEMENTARY RESTRAINT SYSTEM (SRS)

DESCRIPTION

General

The Supplementary Restraint System (SRS) is designed to work in conjunction with the vehicle seat belts. The main components of the system are:

z Driver Airbag – Mounted in the steering wheel to provide added protection for the driver

during a frontal impact.

z Passenger airbag – Mounted in the fascia to provide added protection for the front seat

passenger during a frontal impact.

z Seat Belt Pre-tensioners – Mounted on the inner edge of both front seats within the

seat belt anchorage, to provide added protection during a front impact.

z Airbag Diagnostic Control Unit (DCU) – Mounted beneath the centre console, and used

detect crash conditions and control the SRS system.

z SRS LED – Mounted in the instrument pack, the LED acts as an indicator of system

status.

NOTE: The airbag DCU illuminates the SRS LED for 5 seconds when the ignition switch is turned to the 'ignition' position to inform the driver the SRS LED is functioning correctly.

WARNING: Before starting work on the SRS system, refer to the safety precautions contained within the Workshop manual.

For a detailed description of the SRS system and safety precautions to carry out before starting work, refer to the System Description and Operation Workshop manual.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 3 of the engine compartment fuse box (C0632) on an R wire. Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 8, and fuse 36 of the passenger compartment fuse box (C0588) on a G wire.

Fuse 36 (C0580) provides an ignition feed to the airbag DCU (C0256) on a G wire. The DCU (C0256) is earthed on a B wire. Fuse 8 (C0589) provides an ignition feed to the SRS LED (C0233) on a G wire.

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Driver Airbag

The airbag DCU (C0256) controls the feed to the driver airbag (C0545) via the rotary coupler (C0374) on a Y wire. The airbag DCU (C0256) controls the earth path for the driver airbag (C0545) via the rotary coupler (C0374) on an R wire.

Passenger Airbag

The airbag DCU (C0256) controls the feed to the passenger airbag (C0433) on a W wire. The earth path for the passenger airbag (C0433) is controlled by the airbag DCU (C0256) on a U wire.

Seat Belt Pre-tensioners

The airbag DCU (C0256) controls the feed to the RH pre-tensioner (C0254) on an N wire. The earth path for the RH pre-tensioner (C0254) is controlled by the airbag DCU (C0256) on an NR wire.

The airbag DCU (C0256) controls the feed to the LH pre-tensioner (C0252) on an O wire. The earth path for the LH pre-tensioner (C0252) is controlled by the airbag DCU (C0256) on an OU wire.

SRS LED

Fuse 8 of the passenger compartment fuse box (C0589) provides an ignition feed to the SRS LED (C0233) on a G wire. To illuminate the LED (C0233), an earth path is provided on a YR wire via the airbag DCU (C0256). To extinguish the LED, the airbag DCU withdraws the earth path.

Diagnostic Socket

The SRS system can be interrogated using TestBook or T4 via the diagnostic socket. The diagnostic socket (C0040) is connected to the airbag DCU (C0256) by a K wire.

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AIR CONDITIONING (A/C) – Td4

DESCRIPTION

General

The air conditioning (A/C) system will only operate when the engine is running. The A/C system is switched on and off by pressing the switch mounted on the centre console. When the switch is pressed, an LED mounted within the switch illuminates to inform the driver the system is operational. For more information on LED operation, refer to the Interior Illumination section of this manual.

+ INTERIOR ILLUMINATION.

The position of the rotary heater control determines the amount of warm air from the heater matrix blended with cool air from the A/C evaporator, and hence the temperature of the air output from the heater ducts.

NOTE: The blower switch must be in at least position 1 for the A/C system to operate.

The A/C system is automatically switched on when either the screen or screen/feet positions are selected via the rotary distribution control knob.

NOTE: The A/C LED will not illuminate under these conditions.

For more information on heater operation, refer to the Heater Blower section of this manual.

+ HEATER BLOWER.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 5, fusible link 1 and the main relay (C0632) on an R wire. All are located within the engine compartment fuse box.

The earth path for the main relay coil (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. For more details on main relay operation, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual.

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Fusible link 1 is connected in series with fusible link 2, fuse 8, and fuse 9 which are also located in the engine compartment fuse box. Fuse 8 (C0576) provides a constant battery feed to the heater blower relay (C0153) on a GN then GW wire. Fuse 9 provides a constant battery feed to the compressor clutch relay, which is also located in the engine compartment fuse box.

Fusible link 2 (C0571) is connected to the ignition switch (C0028) by an NR wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 4 of the passenger compartment fuse box (C0588) on an SU wire. Fuse 4 (C0586) provides an ignition feed to the following on G then LGS wires:

z The blower motor switch (C0058). z The fresh/recirculated air switch (C0750). z The fresh/recirculated air motor (C0006).

A/C Master Switch

When the blower switch (C0058) is turned to position 1 or higher, it provides a feed to the A/ C master switch (C0275) and the A/C microswitch (C2575) on SW then B wires. If A/C is requested, the switch (C0275) provides a feed to the instrument pack (C0233) via the microswitch (C2575) on a B then SK wire. When the instrument pack receives an A/C request from the switch, it informs the ECM (C0913 K Series vehicles, C0371 on KV6 vehicles) via the CAN BUS on YN (Low) and YB (High) wires. The A/C master switch is mounted on the centre console, and is earthed (C0275) on a B wire.

For more information on the CAN BUS, refer to the Communication Databuses section of the System Description and Operation Workshop manual.

A/C Microswitch

The A/C microswitch (C2575) is mounted on the rear of the heater distribution control knob, and switches the A/C on automatically when the screen or feet/screen position is selected. In this instance, the switch contacts close, allowing the blower motor switch (C0058) to provide a feed to the instrument pack (C0233) on an SW then SK wire, by-passing the A/C master switch.

Compressor

When the ECM (C0331) receives an A/C request signal via the CAN BUS, it will energise the A/C compressor clutch relay by providing an earth path for the relay coil (C0576) on a UB wire. A feed from fuse 9 of the engine compartment fuse box is now able to flow across the energised relay (C0575) to the compressor clutch (C0127) on an R wire.

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Instrument Pack

The instrument pack (C0230) acts as a gateway, relaying CAN messages to and from different components throughout the vehicle as follows:

Pressure Sensor

The pressure sensor is located in the high pressure A/C line adjacent the compressor, and replaces the more traditional trinary pressure switch. The instrument pack (C0230) provides a 5 V reference voltage to the pressure sensor (C1257) on a UO wire. The pressure sensor (C1257) is provided an earth path via the instrument pack (C0230) on a PB wire.

The pressure sensor (C1257) provides the instrument pack (C0230) a signal feed on a UG wire. The value of this signal feed is dependent upon the pressure within the A/C system. This signal is relayed by the instrument pack (C0230) to the ECM (C0331) via the CAN-BUS on YB (High) and YN (Low) wires. The ECM uses this signal to determine the pressure within the A/C system, enabling it to carry out the following tasks:

z To provide a safety cut-out function if the pressure within the A/C system goes either

too high or too low.

z To control the speed of the cooling and condenser fans via the cooling fan ECU. z To help control engine idle speed.

Evaporator Temperature Sensor

The evaporator temperature sensor is used to ensure the evaporator doesn't freeze. The instrument pack (C0230) provides a feed to the evaporator temperature sensor (C0417) on a GO wire. The sensor (C0417) is earthed on a B wire. The instrument pack relays the temperature reading to the ECM (C0331) via the CAN BUS on YB (High) and YN (Low) wires.

NOTE: The ECM also uses the evaporator temperature sensor signal in conjunction with the pressure sensor signal to help control engine idle speed.

For more information on CAN messages, refer to the Communication Databuses section of the System Description and Operation Workshop manual.

Cooling Fan Control Unit

Fusible link 5 of the engine compartment fuse box (C0573) provides a constant battery feed to the cooling fan control unit (C0208) on an NG wire. Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the cooling control unit (C1680) on an NK wire when the main relay is energised (see above). The cooling control unit (C0208) is earthed on a B wire.

To control cooling fan and condenser fan speed, the ECM (C0331) provides the cooling fan control unit (C1680) a Pulse Width Modulated (PWM) signal on a UW wire. The frequency of the pulses supplied by the ECM determines the speed the cooling fan control unit will drive the cooling fan and condenser fan motors.

FREELANDER 03MY 4.75

Land Rover Freelander (2003) Electrical Library

Specifications and Main Features

Frequently Asked Questions

User Manual

INTRODUCTION

ABOUT THIS DOCUMENT

ELECTRICAL PRECAUTIONS

ABBREVIATIONS

HOW TO USE THIS DOCUMENT

FAULT DIAGNOSIS

WIRE COLOUR CODES

FUSE DETAILS

ENGINE COMPARTMENT FUSE BOX

PASSENGER COMPARTMENT FUSE BOX

EARTH POINTS AND HEADERS

DESCRIPTION AND OPERATION

ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL)

ENGINE IMMOBILISATION

WINDOWS

SUNROOF

DOOR MIRRORS

FOLDING DOOR MIRRORS

HEATED SEATS

DIAGNOSTIC SOCKET

CENTRAL CONTROL UNIT (CCU)

CHARGING AND STARTING – Td4

CHARGING AND STARTING – K SERIES

CHARGING AND STARTING – KV6

CHARGING AND STARTING – KV6 (NORTH AMERICA)

CRUISE CONTROL – TD4 & KV6 (NORTH AMERICA)

CRUISE CONTROL – KV6

ELECTRONIC AUTOMATIC TRANSMISSION (EAT)

ANTI-LOCK BRAKING SYSTEM (ABS)

SUPPLEMENTARY RESTRAINT SYSTEM (SRS)

AIR CONDITIONING (A/C) – Td4