Jeep Wrangler 2000 User Manual

jeep :: Jeep Truck Wrangler L6-4.0L VIN S (2000)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Accessory Delay Relay > Component Information > Description and Operation

Accessory Delay Relay: Description and Operation
ACCESSORY RELAY

The accessory relay is an electromechanical device that switches fused battery current to the standard factory-installed cigar lighter when theignition switch is turned to the Accessory or ON positions. The accessory relay is located in a wire harness connector that is secured to the100-way connector bracket under the driver side of the instrument panel, near the cowl side inner panel in the passenger compartment.

The accessory relay is a International Standards Organization (ISO) relay. Relays conforming to the ISO specifications have common physicaldimensions, current capacities, terminal patterns, and terminal functions.
The accessory relay cannot be repaired or adjusted and, if faulty or damaged, it must be replaced.

The ISO relay consists of an electromagnetic coil, a resistor or diode, and three (two fixed and one movable) electrical contacts. The movable(common feed) relay contact is held against one of the fixed contacts (normally closed) by spring pressure. When the electromagnetic coil isenergized, it draws the movable contact away from the normally closed fixed contact, and holds it against the other (normally open) fixed contact.

When the electromagnetic coil is de-energized, spring pressure returns the movable contact to the normally closed position. The resistor or diode isconnected in parallel with the electromagnetic coil in the relay, and helps to dissipate voltage spikes that are produced when the coil isde-energized.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Locations

Sentry Key Immobilizer Module

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Locations > Page 11

Sentry Key Immobilizer Module

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Locations > Page 12

Alarm Module: Description and Operation
SENTRY KEY IMMOBILIZER MODULE

The Sentry Key Immobilizer Module (SKIM) contains a Radio Frequency (RF) transceiver and a central processing unit, which includes theSentry Key Immobilizer System (SKIS) program logic. The SKIS programming enables the SKIM to program and retain in memory the codes ofat least one, but no more than eight electronically coded Sentry Key transponders. The SKIS programming also enables the SKIM to communicateover the Chrysler Collision Detection (CCD) data bus network with the Power- train Control Module (PCM), the instrument cluster and/or theDRB III scan tool.

eight millimeters (0.31 inches)

The SKIM transmits and receives RF signals through a tuned antenna enclosed within a molded plastic ring formation that is integral to the SKIMhousing. When the SKIM is properly installed on the steering column, the antenna ring is oriented around the circumference of the ignition lockcylinder housing. This antenna ring must be located within of the Sentry Key in order to ensure proper RFcommunication between the SKIM and the Sentry Key transponder.

For added system security, each SKIM is programmed with a unique "Secret Key" code and a security code (PIN). The SKIM keeps the "SecretKey" code in memory. This "Secret Key" code must be transferred to the PCM memory during the initialization/programming of the SKIS whenthe vehicle is manufactured, and each time the PCM is replaced during vehicle service by the dealer technician. The SKIM also transfers the"Secret Key" code to the memory of each of the Sentry Key transponders during new key programming. The security code is used by the assemblyplant to access the SKIS for initialization, or by the dealer technician to access the system for service. The SKIM also stores in its memory theVehicle Identification Number (VIN), which it learns through a CCD data bus message from the PCM during initialization.

The SKIM and the PCM both use software that includes a rolling code algorithm strategy, which helps to reduce the possibility of unauthorizedSKIS disarming. The rolling code algorithm ensures security by preventing an override of the SKIS through the unauthorized substitution of theSKIM or the PCM. However, the use of this strategy also means that replacement of either the SKIM or the PCM units will require a systeminitialization procedure to restore system operation.

When the ignition switch is turned to the ON or START positions, the SKIM transmits an RF signal to excite the Sentry Key transponder. TheSKIM then listens for a return RF signal from the transponder of the Sentry Key that is inserted in the ignition lock cylinder. If the SKIM receivesan RF signal with valid "Secret Key" and transponder identification codes, the SKIM sends a "valid key" message to the PCM over the CCD databus. If the SKIM receives an invalid RF signal or no response, it sends "invalid key" messages to the PCM. The PCM will enable or disable engineoperation based upon the status of the SKIM messages.

three seconds

The SKIM also sends messages to the instrument cluster over the CCD data bus network to control the SKIS indicator lamp. The SKIM sendsmessages to the instrument cluster to turn the lamp on for about when the ignition switch is turned to the ON position as a bulb test.After completion of the bulb test, the SKIM sends bus messages to keep the lamp off for a duration of about one second. Then the SKIM sendsmessages to turn the lamp on or off based upon the results of the SKIS self-tests. If the SKIS indicator lamp comes on and stays on after the bulbtest, it indicates that the SKIM has detected a system malfunction and/or that the SKIS has become inoperative.

If the SKIM detects an invalid key when the ignition switch is turned to the ON position, it sends messages to the instrument cluster to flash theSKIS indicator lamp. The SKIM can also send messages to the instrument cluster to flash the lamp and to generate a single audible chime tone.These functions serve as an indication to the customer that the SKIS has been placed in its "Customer Learn" programming mode. See Sentry KeyImmobilizer System Transponder Programming for more information on the "Customer Learn" programming mode.

For diagnosis or initialization of the SKIM and the PCM, a DRB III scan tool and the proper Diagnostic Procedures are required. The SKIMcannot be repaired and, if faulty or damaged, the unit must be replaced.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Service and Repair > Sentry Key Immobilizer Module Replacement

Alarm Module: Service and RepairSentry Key Immobilizer Module Replacement

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.

1. Disconnect and isolate the battery negative cable.2. Remove the knee blocker from the instrument panel.

Steering Column Shrouds Remove/Install

with the optional tilt steering column, move the tilt steering column to the fully lowered position.

5. Remove both the upper and lower shrouds from the steering column.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Service and Repair >

Sentry Key Immobilizer Module Replacement > Page 15

Wrangler L6-4.0L VIN S (2000)

3. Remove the three screws that secure the lower steering column shroud to the upper shroud.4. If the vehicle is equipped with a standard non-tilt steering column, loosen the two upper steering column mounting nuts. If the vehicle is equipped

Smart Key Immobilizer Module Remove/Install

6. Disengage the steering column wire harness retainer from the tab on the top of the Sentry Key Immobilizer Module (SKIM) mounting bracket.7. Unplug the wire harness connector from the SKIM receptacle.8. The SKIM mounting bracket features a clip formation that secures the SKIM to the inboard lower flange of the steering column jacket. Pull
downward on the connector end of the SKIM mounting bracket to release this clip from the steering column jacket.

9. Rotate the SKIM and its mounting bracket downwards and then to the side away from the steering column to slide the SKIM antenna ring from
around the ignition switch lock cylinder housing.

10. Remove the SKIM from the vehicle.11. Reverse the removal procedures to install. Tighten the non-tilt steering column mounting nuts to and the steering column22 Nm (200 in. lbs.)
shroud mounting screws to .2 Nm (18 in. lbs.)

NOTE:

If the SKIM is replaced with a new unit, a DRB III scan tool and the proper Diagnostic Procedures MUST be used to initialize the newSKIM and to program at least two Sentry Key transponders.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Service and Repair > Sentry Key Immobilizer Module Replacement > Page

16

Alarm Module: Service and RepairProgramming the Sentry Key Immobilizer Module
PROGRAMMING THE SENTRY KEY IMMOBILIZER MODULE

NOTE:

IF THE PCM AND THE SKIM ARE REPLACED AT THE SAME TIME, PROGRAM THE VIN INTO THE PCM FIRST. ALLVEHICLE KEYS WILL THEN NEED TO BE REPLACED AND PROGRAMMED TO THE NEW SKIM.

1. Turn the ignition ON (transmission in Park/Neutral).2. Use the DRB and select "THEFT ALARM", "SKIM" then "MISCELLANEOUS".3. Select "SKIM MODULE REPLACEMENT (GASOLINE)".4. Program the vehicle four-digit PIN into the SKIM.5. Select "COUNTRY CODE" and enter the correct country.

NOTE:

BE SURE TO ENTER THE CORRECT COUNTRY CODE. IF THE INCORRECT COUNTRY CODE IS PROGRAMMED INTO SKIM, THE SKIM MUST BE REPLACED.

6. Select "UPDATE VIN" (the SKIM will learn the VIN from the PCM).7. Press "ENTER" to transfer the VIN (the PCM will send the VIN to the SKIM).8. The DRB will ask if you want to transfer the secret key. Select "ENTER" to transfer secret key from the PCM. This will ensure the current
vehicle ignition keys will still operate the SKIS system.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Service and Repair > Sentry Key Immobilizer Module Replacement > Page

17

Alarm Module: Service and RepairProgramming Ignition Keys to the Sentry Key Immobilizer Module
PROGRAMMING THE IGNITION KEYS TO THE SENTRY KEY IMMOBILIZER MODULE

1. Turn the ignition ON (transmission in Park/Neutral).2. Use the DRB and select "THEFT ALARM", "SKIM" then "MISCELLANEOUS".3. Select "PROGRAM IGNITION KEYS".4. Enter secured access mode by entering the vehicle four-digit PIN.

NOTE:

A MAXIMUM OF EIGHT KEYS CAN BE LEARNED TO EACH SKIM. ONCE A KEY IS LEARNED TO A SKIM IT (THE KEY)CANNOT BE TRANSFERRED TO ANOTHER VEHICLE.
If ignition key programming is unsuccessful, the DRB will display one of the following messages:

The DRB attempts to read the programmed key status and there are no keys programmed in the SKIM memory.Programming Not Attempted

Programming Key Failed

(Possible Used Key From Wrong Vehicle) - SKIM is unable to program key due to one of the following:-

faulty ignition key transponder

- ignition key is programmed to another vehicle.

8 Keys Already Learned, Programming Not Done

SKIM transponder ID memory is full.1. Obtain ignition keys to be programmed from customer (8 keys maximum).2. Using the DRB, erase all ignition keys by selecting "MISCELLANEOUS" and "ERASE ALL CURRENT IGN. KEYS".3. Program all ignition keys.

Ignition key transponder ID is currently programmed in SKIM memory.Learned Key In Ignition

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations

8w-10-2

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 22

ABS Main Relay: Diagrams

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 23

Wrangler L6-4.0L VIN S (2000)

Power Distribution Center

ABS Pump Motor Relay

ABS System Relay

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Specifications

Controller Antilock Brake: Specifications

Mounting Bolts 60-80 in.lb

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Specifications > Page 27

Controller Antilock Brake

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Specifications > Page 28

Controller Antilock Brake: Diagrams

Controller Anti-lock Brake C1 Gray 12 Way

Controller Anti-Lock Brake C1 Gray 12 Way

Controller Anti-lock Brake C2 Gray 18 Way

Controller Anti-Lock Brake C2 Gray 18 Way

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Specifications > Page 29

Controller Antilock Brake: Description and Operation

DESCRIPTION

Fig. 1

The CAB operates the ABS system and is separate from other vehicle electrical circuits. The CAB is located under the instrument panel to the rightside of the steering column. It is mounted to bracket with one bolt. The bracket is mounted to the front upper cowl panel.

OPERATION

The CAB voltage source is through the ignition switch in the RUN position. The CAB contains dual microprocessors. A logic block in eachmicroprocessor receives identical sensor signals. These signals are processed and compared simultaneously. The CAB contains a self check programthat illuminates the ABS warning light when a system fault is detected. Faults are stored in a diagnostic program memory and are accessible with theDRB scan tool. ABS faults remain in memory until cleared, or until after the vehicle is started approximately 50 times. Stored faults are not erased ifthe battery is disconnected.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Controller Antilock Brake <--> [Electronic Brake Control Module] > Component Information > Specifications > Page 30

Controller Antilock Brake: Service and Repair

REMOVAL

1. Remove negative battery terminal.

Fig. 5

2. Remove the harness connector from the CAB located underneath the instrument panel.3. Remove mounting bolt and remove the CAB.

INSTALLATION

7 - 9 Nm (60 - 80 in. lbs.)

1. Install the controller and install the mounting bolt.2. Tighten the mounting bolt to .3. Plug in the harness connector into the controller.4. Install negative battery cable.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations

Blower Motor Relay: Locations

Blower Motor Relay

The blower motor relay is located in a wire harness connector that is secured to the Heater-A/C housing behind the glove box on the passenger side ofthe vehicle, next to the Heater-A/C wire harness connector in the passenger compartment.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 35

Blower Motor Relay: Description and Operation
BLOWER MOTOR RELAY

The blower motor relay is a International Standards Organization (ISO)-type relay. The relay is a electromechanical device that switches battery currentto the blower motor.

When the blower motor switch is in any position except off, and the ignition is turned on, the blower motor relay is energized and provides battery feedto the blower motor from a fuse in the fuse block module through the blower motor resistor.
The blower motor relay coil is controlled by a voltage signal from the blower motor switch.

The blower motor relay is installed in a wire harness connector located near the passenger side outboard end of the Heater-A/C housing in the passengercompartment, next to the Heater-A/C wire harness connector.
The blower motor relay cannot be repaired and, if faulty or damaged, it must be replaced.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Testing and Inspection > Relay Circuit Test

Blower Motor Relay: Testing and InspectionRelay Circuit Test

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.

1. The relay common feed terminal cavity (30) is connected to the blower motor. This terminal supplies fused battery feed directly from a fuse in the

Power Distribution Center (PDC) when the relay is energized, and ignition switched battery feed from a fuse in the fuse block module through theblower motor resistor when the relay is de-energized. There should be continuity between this cavity and the blower motor feed circuit cavity ofthe blower motor wire harness connector at all times. If OK, go to Step 2. If not OK, repair the open circuit as required.

2. The relay normally closed terminal cavity (87A) is connected to the blower motor resistor output. When the relay is de-energized, terminal 87A is

connected to terminal 30 and provides the blower motor resistor output to the blower motor feed circuit. There should be continuity between thiscavity and the blower resistor outputs circuit cavity of the blower motor resistor wire harness connector at all times. If OK, go to Step 3. If not OK,repair the open circuit as required.

3. The relay normally open terminal cavity (87) is connected to a fused battery feed from the PDC. When the relay is energized, terminal 87 is
connected to terminal 30 and provides full battery current to the blower motor feed circuit. There should be battery voltage at this cavity at alltimes. If OK, go to Step 4. If not OK, repair the open circuit to the PDC as required.

4. The coil battery terminal cavity (86) is connected to the high speed output contacts of the blower motor switch. When the blower motor switch is

placed in the high speed position, fused ignition switch output is directed to the relay electromagnetic Coil to energize the relay. There should becontinuity between the cavity for relay terminal 86 and the high blower motor relay control circuit cavity of the blower motor switch wire harnessconnector at all times. If OK, go to Step 5. If not OK, repair the open circuit as required.

5. The coil ground terminal cavity (85) is connected to ground. This terminal supplies the ground for the relay electromagnet coil. There should be
continuity between the cavity for relay terminal 85 and a good ground at all times. If not OK, repair the open circuit as required.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Testing and Inspection > Relay Circuit Test > Page 38

Blower Motor Relay: Testing and InspectionRelay Test

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.

Blower Motor Relay

The blower motor relay is located in a wire harness connector that is secured to the Heater-A/C housing behind the glove box on the passenger side ofthe vehicle, next to the Heater-A/C wire harness connector in the passenger compartment. Remove the relay from its connector to perform the followingtests:

1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,
go to Step 2. If not OK, replace the faulty relay.

75 5 ohms

2. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 3. If not OK, replace the faulty relay.3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, see the Relay Circuit Test procedure. If not OK, replace the faulty relay.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Testing and Inspection > Page 39

Blower Motor Relay: Service and Repair

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.
REMOVAL

1. Disconnect and isolate the battery negative cable.2. Remove the glove box from the instrument panel.

Blower Motor Relay Remove/Install

3. Locate the blower motor relay through the instrument panel glove box opening. The relay is mounted upright and to the right of the instrument
panel harness.

4. Unplug the blower motor relay from its wire harness connector.

INSTALLATION

1. Install the blower motor relay by aligning the relay terminals with the cavities in the wire harness connector and pushing the relay firmly into
place.

2. Reinstall the glove box in the instrument panel.3. Connect the battery negative cable.4. Test the relay operation.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations

Compressor Clutch Relay: Locations

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 43

Wrangler L6-4.0L VIN S (2000)

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Compressor Clutch Relay

The compressor clutch relay is located in the Power Distribution Center (PDC).

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 44

Compressor Clutch Relay: Diagrams

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 45

Wrangler L6-4.0L VIN S (2000)

Power Distribution Center

A/C Compressor Clutch Relay

8w-10-2

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 46

Compressor Clutch Relay: Description and Operation
COMPRESSOR CLUTCH RELAY

The compressor clutch relay is a International Standards Organization (ISO) micro-relay. The terminal designations and functions are the same as aconventional ISO relay. However, the micro-relay terminal orientation (footprint) is different, the current capacity is lower, and the relay casedimensions are smaller than those of the conventional ISO relay.

The compressor clutch relay is located in the Power Distribution Center (PDC) in the engine compartment. Refer to the PDC label for relay identificationand location.

The compressor clutch relay is a electromechanical device that switches battery current to the compressor clutch coil when the Powertrain ControlModule (PCM) grounds the coil side of the relay. The PCM responds to inputs from the heater-A/C mode control switch, the low pressure cycling clutchswitch, and the high pressure cut-off switch.
The compressor clutch relay cannot be repaired and, if faulty or damaged, it must be replaced.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Testing and Inspection > Relay Circuit Test

Compressor Clutch Relay: Testing and InspectionRelay Circuit Test

1. The relay common feed terminal cavity (30) is connected to fused battery feed. There should be battery voltage at the cavity for relay terminal 30
at all times. If OK, go to Step 2. If not OK, repair the open circuit to the fuse in the PDC as required.

2. The relay normally closed terminal (87A) is not used in this application. Go to Step 3.3. The relay normally open terminal cavity (87) is connected to the compressor clutch coil. There should be continuity between this cavity and the
A/C compressor clutch relay output circuit cavity of the compressor clutch coil wire harness connector. If OK, go to Step 4. If not OK, repair theopen circuit as required.

4. The relay coil battery terminal (86) is connected to the fused ignition switch output (run/start) circuit. There should be battery voltage at the cavity
for relay terminal 86 with the ignition switch in the ON position. If OK, go to Step 5, If not OK, repair the open circuit to the fuse in the fuseblockmodule as required.

5. The coil ground terminal cavity (85) is switched to ground through the Powertrain Control Module (PCM). There should be continuity between
this cavity and the A/C compressor clutch relay control circuit cavity of the PCM wire harness connector C (gray) at all times. If not OK, repair theopen circuit as required.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Testing and Inspection > Relay Circuit Test > Page 49

Compressor Clutch Relay: Testing and InspectionA/C Compressor Clutch Relay

Compressor Clutch Relay

The compressor clutch relay is located in the Power Distribution Center (PDC). Refer to the PDC label for relay identification and location. Remove therelay from the PDC to perform the following tests:

1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,
go to Step 2. If not OK, replace the faulty relay.

75 5 ohms

2. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 3. If not OK, replace the faulty relay.3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, see the Relay Circuit Test procedure. If not OK, replace the faulty relay.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Testing and Inspection > Page 50

Compressor Clutch Relay: Service and Repair
REMOVAL AND INSTALLATION

1. Disconnect and isolate the battery negative cable.

Power Distribution Center

2. Remove the cover from the Power Distribution Center (PDC).3. Refer to the label on the PDC for compressor clutch relay identification and location.4. Unplug the compressor clutch relay from the PDC.5. Install the compressor clutch relay by aligning the relay terminals with the cavities in the PDC and pushing the relay firmly into place.6. Install the PDC cover.7. Connect the battery negative cable.8. Test the relay operation.

> Relays and Modules> Relays and Modules - Instrument Panel > Cigarette Lighter Relay > Component Information > Description and Operation

Cigarette Lighter Relay: Description and Operation
ACCESSORY RELAY

The accessory relay is an electromechanical device that switches fused battery current to the standard factory-installed cigar lighter when theignition switch is turned to the Accessory or On positions. The accessory relay is located in a wire harness connector that is secured to the 100-wayconnector bracket under the driver side of the instrument panel, near the cowl side inner panel in the passenger compartment.

The accessory relay is a International Standards Organization (ISO) relay. Relays conforming to the ISO specifications have common physicaldimensions, current capacities, terminal patterns, and terminal functions.
The accessory relay cannot be repaired or adjusted and, if faulty or damaged, it must be replaced.

The ISO relay consists of an electromagnetic coil, a resistor or diode, and three (two fixed and one movable) electrical contacts. The movable(common feed) relay contact is held against one of the fixed contacts (normally closed) by spring pressure. When the electromagnetic coil isenergized, it draws the movable contact away from the normally closed fixed contact, and holds it against the other (normally open) fixed contact.

When the electromagnetic coil is de-energized, spring pressure returns the movable contact to the normally closed position. The resistor or diode isconnected in parallel with the electromagnetic coil in the relay, and helps to dissipate voltage spikes that are produced when the coil isde-energized.

> Relays and Modules > Relays and Modules - Instrument Panel > Cigarette Lighter Relay > Component Information > Description and Operation > Page 55

Cigarette Lighter Relay: Testing and Inspection

Accessory Relay

The accessory relay is located in a wire harness connector that is secured to the 100-way connector bracket under the driver side of the instrument panel,near the cowl side inner panel in the passenger compartment. For complete circuit diagrams, refer to Horn/Cigar Lighter in the Contents of WiringDiagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.

1. Remove the accessory relay from its wire harness connector. Refer to Accessory Relay for the procedures.2. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,
go to Step 3. If not OK, replace the faulty relay.

75 5 ohms

3. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 4. If not OK, replace the faulty relay.4. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, perform the Relay Circuit Test that follows. If not OK, replace the faulty relay.

Relay Circuit Test

1. The relay common feed terminal (30) is connected to battery voltage and should be hot at all times. Check for battery voltage at the fused B(+)
circuit cavity of the accessory relay wire harness connector. If OK, go to Step 2. If not OK, repair the fused B(+) circuit to the fuse in the PowerDistribution Center (PDC) as required.

2. The relay normally closed terminal (87A) is connected to terminal 30 in the de-energized position, but is not used for this application. Go to Step

3.

3. The relay normally open terminal (87) is connected to the common feed terminal (30) in the energized position. This terminal supplies battery

voltage to the cigar lighter when the relay is energized by the ignition switch. There should be continuity between the accessory relay wire harnessconnector cavity for relay terminal 87 and the accessory relay output circuit cavity in the cigar lighter wire harness connector at all times. If OK,go to Step 4. If not OK,repair the open accessory relay output circuit to the cigar lighter wire harness connector as required.

4. The coil battery terminal (86) is connected to the electromagnet in the relay. The accessory relay wire harness connector cavity for this terminal
should have continuity to ground at all times. If OK, go to Step 5. If not OK, repair the open ground circuit to ground as required.

5. The coil ground terminal (85) is connected to the electromagnet in the relay. It receives battery feed to energize the accessory relay when the

ignition switch is in the Accessory or On positions. Turn the ignition switch to the On position. Check for battery voltage at the fused ignitionswitch output (ace/run) circuit cavity of the accessory relay wire harness connector. If not OK, repair the open fused ignition switch output(ace/run) circuit to the ignition switch as required.

> Relays and Modules > Relays and Modules - Instrument Panel > Cigarette Lighter Relay > Component Information > Description and Operation > Page 56

Cigarette Lighter Relay: Service and Repair

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.
REMOVAL

1. Disconnect and isolate the battery negative cable.

Accessory Relay Remove/Install

2. Reach up under the instrument panel outboard of the steering column to access the accessory relay and the accessory relay wire harness connector,
which is secured to the 100-way wire harness connector mounting bracket.

3. Disconnect the accessory relay from the accessory relay wire harness connector.4. Remove the accessory relay from under the instrument panel.

INSTALLATION

harness connector.

4. Reconnect the battery negative cable.

1. Position the accessory relay to the accessory relay wire harness connector under the instrument panel.2. Align the terminals of the accessory relay with the cavities in the accessory relay wire harness connector.3. Push on the accessory relay case firmly and evenly until all of the relay terminals are fully seated within the cavities of the accessory relay wire

> Relays and Modules > Relays and Modules - Lighting and Horns > Daytime Running Lamp Control Unit > Component Information > Description and Operation

Daytime Running Lamp Control Unit: Description and Operation

DAYTIME RUNNING LAMP MODULE

The Daytime Running Lights (Headlamps) System is installed on vehicles manufactured for sale in Canada only. A separate module, mounted on thecowl, controls the DRL.

3 kph 2 mph

1meter 3 feet

Battery positive voltage is supplied to the Daytime Running Lamp (DRL) module through a circuit breaker and a fuse in the PDC. Ignition positivevoltage is supplied to the DRL module through a fuse in the fuse block. The DRL module also utilizes a VSS input, high and low beam sense circuits andhigh beam indicator driver. The DRL module is grounded to the chassis. Once the vehicle reaches a speed of () and travels more than () with the headlamp switch in the off position, the DRL module will activate the HIGH beams at a reduced intensity (36% of full intensity).When the headlamp switch is placed in the LOW beam position the DRL will turn off. When the headlamp switch is turned to the HIGH beam position,the high beams will operate normally (full intensity) and the DRL module will also illuminate the HIGH BEAM indicator in the instrument cluster.

> Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations

Horn Relay: Locations

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 67

Wrangler L6-4.0L VIN S (2000)

8w-10-2

Horn Relay

The horn relay is located in the Power Distribution Center (PDC) behind the battery on the driver side of the engine compartment.

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 68

Horn Relay: Diagrams

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 69

Wrangler L6-4.0L VIN S (2000)

8w-10-2

Power Distribution Center

Horn Relay

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 70

Horn Relay: Service Precautions

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 71

Horn Relay: Description and Operation

The horn relay is a electromechanical device that switches battery current to the horn when the horn switch grounds the relay coil. The horn relay islocated in the Power Distribution Center (PDC) in the engine compartment. If a problem is encountered with a continuously sounding horn, it can usuallybe quickly resolved by removing the horn relay from the PDC until further diagnosis is completed. See the fuse and relay layout label affixed to theinside surface of the PDC cover for horn relay identification and location.

The horn relay is a International Standards Organization (ISO) micro-relay. Relays conforming to the ISO specifications have common physicaldimensions, current capacities, terminal patterns, and terminal functions. The ISO micro-relay terminal functions are the same as a conventional ISOrelay. However, the ISO micro-relay terminal pattern (or footprint) is different, the current capacity is lower, and the physical dimensions are smallerthan those of the conventional ISO relay.
The horn relay cannot be repaired or adjusted and, if faulty or damaged, it must be replaced.

The ISO relay consists of an electromagnetic coil, a resistor or diode, and three (two fixed and one movable) electrical contacts. The movable (commonfeed) relay contact is held against one of the fixed contacts (normally closed) by spring pressure. When the electromagnetic coil is energized, it draws themovable contact away from the normally closed fixed contact, and holds it against the other (normally open) fixed contact.

When the electromagnetic coil is de-energized, spring pressure returns the movable contact to the normally closed position. The resistor or diode isconnected in parallel with the electromagnetic coil in the relay, and helps to dissipate voltage spikes that are produced when the coil is de-energized.

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 72

Horn Relay: Testing and Inspection

Horn Relay

The horn relay is located in the Power Distribution Center (PDC) behind the battery on the driver side of the engine compartment. If a problem isencountered with a continuously sounding horn, it can usually be quickly resolved by removing the horn relay from the PDC until further diagnosis iscompleted. See the fuse and relay layout label affixed to the inside surface of the PDC cover for horn relay identification and location.

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFOREATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLEPERSONAL INJURY.
Relay Test

1. Remove the horn relay from the PDC.2. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,
go to Step 3. If not OK, replace the faulty relay.

75 5 ohms

3. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 4. If not OK, replace the faulty relay.4. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, perform the Relay Circuit Test that follows. If not OK, replace the faulty relay.

Relay Circuit Test

1. The relay common feed terminal cavity (30) is connected to battery voltage and should be hot at all times. If OK, go to Step 2. If not OK, repair
the open circuit to the fuse in the PDC as required.

2. The relay normally closed terminal (87A) is connected to terminal 30 in the deenergized position, but is not used for this application. Go to Step 3.3. The relay normally open terminal (87) is connected to the common feed terminal (30) in the energized position. This terminal supplies battery
voltage to the horn(s). There should be continuity between the cavity for relay terminal 87 and the horn relay output circuit cavity of each hornwire harness connector at all times. If OK, go to Step 4. If not OK, repair the open circuit to the horn(s) as required.

4. The coil battery terminal (86) is connected to the electromagnet in the relay. It is connected to battery voltage and should be hot at all times. Check
for battery voltage at the cavity for relay terminal 86. If OK, go to Step 5. If not OK, repair the open circuit to the fuse in the PDC as required.

5. The coil ground terminal (85) is connected to the electromagnet in the relay. It is grounded through the horn switch when the horn switch is
depressed. Check for continuity to ground at the cavity for relay terminal 85. There should be continuity with the horn switch depressed, and nocontinuity with the horn switch released.

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 73

Horn Relay: Service and Repair
REMOVAL

1. Disconnect and isolate the battery negative cable.

Power Distribution Center

2. Unlatch and open the cover on the Power Distribution Center (PDC).3. See the fuse and relay layout label on the underside of the PDC cover for horn relay identification and location.4. Remove the horn relay from the PDC.

INSTALLATION

1. Position the horn relay in the proper receptacle in the PDC.2. Align the horn relay terminals with the terminal cavities in the PDC receptacle.3. Push down firmly on the horn relay until the terminals are fully seated in the terminal cavities in the PDC receptacle.4. Close and latch the cover onto the PDC.5. Reconnect the battery negative cable.

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Fuse Block

Relay Box: LocationsFuse Block

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Fuse Block > Page 79

Wrangler L6-4.0L VIN S (2000)

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Fuse Block > Page 80

Relay Box: LocationsPower Distribution Center

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Fuse Block > Page 81

Wrangler L6-4.0L VIN S (2000)

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block

Relay Box: Application and IDFuse Block

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block > Page 84

Wrangler L6-4.0L VIN S (2000)

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block > Page 85

Relay Box: Application and IDPower Distribution Center

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block > Page 86

Wrangler L6-4.0L VIN S (2000)