Mercedes S 420 1996 4.2L Workshop Manual

mercedesbenz :: Mercedes Benz S 420 (140.043) V8

-4.2L (119.981) (1996)

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

Alarm Module: Locations

Figures 11 thru 15

Figure

12

Component Name

ATA control module

Component ID

N26

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Service and Repair > Remove/Install Infrared Motion Sensor Control Unit

Alarm Module: Service and RepairRemove/Install Infrared Motion Sensor Control Unit

Replacing Infrared Interior Motion Sensor Control Module (N26/3)

Trim (1) in right of trunk

remove, install.

Screw (arrow)

unscrew, screw in.

Infrared interior motion sensor control module (N26/3)

remove, install.

Electrical connectors (2-4).

unplug, plug in.

Perform function check.NOTE:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Service and Repair > Remove/Install Infrared Motion Sensor Control Unit >

Page 9

Alarm Module: Service and RepairRemove/Install ATA Control Module

Trim (1) in right of trunk

remove, install.

Plastic nuts or screws (arrows at N26)

unscrew, screw on.

Anti-theft alarm system (ATA) control unit (N26)

remove, install.

Electrical connector

unplug, plug in.

Perform function check.NOTE:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Audio Control Relay > Component Information > Locations

Audio Control Relay: Locations

Figures 26 and 28

Figure

28

Component Name

Audio switchover relay module

Component ID

A35/2

Component ID Component Name

A35 CTEL transmitter-receiver
A35/2 Audio switchover relay module
N2/4 Seat belt warning module (USA)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Diagrams > Diagram Information and Instructions

Emergency Contact Module: Diagram Information and Instructions

Diagram System

Wiring diagrams are divided into systems. The layout of the system diagram contains all components of the system (ie: control modules, sensors, voltagesupply, fuse connection, etc.).

For easier comprehension, some system diagrams may be depicted in multiple articles (Part 1, Part 2, etc.). In addition, the subsequent diagrams mayshow wire leads which direct you, by means of an arrow, to a different "part" within that system.

For example: X4/25 (2) II

The X4/25 (2) indicates that the wire continues to component/connector X4/25, pin 2 and the Roman Numeral II indicates that this component and it'swiring may be found in Part 2 of the diagram for the same component/system. (III would direct you to part 3 and so forth.)

Variations in wiring or componentry which are model specific, or due to engine variations or equipment levels are enclosed by a dashed box.
Phase-in changes in variations are denoted with (1) and (2).

Components/wiring for California vehicles are indicated by the callout U2 in the upper left hand corner of a dashed box. The callout U2 is thenreferenced in the legend (component index) as valid for USA California.

Connector sleeves (Z) are replaced by a twin-connection when applicable.Z1 and Z2 are parallel Z splices with the same voltage potential.Actual cross section of wire may differ from values shown in wiring diagram.Changes in cross section of wire will be shown framed.The information for option variations (i.e. ->95 and 96->) denotes: end of MY 1995 and beginning of MY 1996 (respectively).

Vehicles Identification Numbers (VIN) are valid for vehicles built during main production run.Vehicles built during production phase-in or production start-up may have lower Vehicle Identification Numbers.
Coordination of acronym to function is listed in "Acronyms".

Components which include a slash mark in their description, (ie: N47-1 ASR/SPS control module) indicates that the component is applicable to eitherboth systems or just one of the systems.
Example: N47-1 ASR/SPS control module
Model 129 is not equipped with SPS, therefore on a model 129 vehicle, the control module is applicable only for ASR.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Diagrams > Diagram

Information and Instructions > Page 17

S 420 (140.043) V8-4.2L (119.981) (1996)

Model 140 is equipped with SPS, therefore on a model 140 vehicle, the control module is applicable for both ASR and SPS.

Finding the Location of a Connector, Component, Splice or Ground

Abbreviations used within diagrams:X = Connector (example, connector X18)Z = Connector sleeve (Splice)(example, connector sleeve Z49)W = Ground (example, ground W11)

If locations of components, connectors, splices and grounds cannot be found at the system level or component level, they may be found at locations at thevehicle level. See: Locations

Wiring Diagram System: System Diagram Layout Explanation

Acronyms Used

Acronym/Abbrev./ Definition
Symbol

A/C (Automatic) Air Conditioning (Automatic)
AB AirBag
ABS Anti-lock Brake System
ACSR Automatic Child Seat Recognition
ADM Automatic Dimming inside rearview Mirror
ADS Adaptive Damping System
AIR Secondary AIR injection
AP Accelerator Pedal
AS Antenna Systems
ASD Automatic locking differential
ASR Acceleration Slip Regulation
AT Automatic Transmission
ATA Anti-Theft Alarm
B+ Generator output voltage, hot when engine is running
BA Backup Assist
BARO BAROmetric pressure
BAS Brake Assist
BCAPC Barometric pressure-Charge Air Pressure Compensation
BDC Bottom Dead Center
BF Front passenger
BK Black
BLS Brake Lamp Switch
BLS (NC) Brake Lamp Signal (normally closed switch)
BLS (NO) Brake Lamp Signal (normally open switch)
BM Base Module
BN BrowN
BPC Barometric Pressure Compensation
BU Blue

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Diagrams > Diagram

Information and Instructions > Page 18

S 420 (140.043) V8-4.2L (119.981) (1996)

CA Closing Assist
CAN Controller Area Network

CAN H Engine CAN-Bus High signal
CAN IH Interior CAN-Bus High signal
CAN IL Interior CAN-Bus Low signal
CAN L Engine CAN-Bus Low signal
CC Cruise Control
CCM Combination Control Module
CCS Climate Sontrolled Seat
CDC CD Changer
CF Convenience Feature
CFI Continuous Fuel Injection system (electronic)

CKA CranK Angle
CKP CranKshaft Position
CL Central Locking
CLUS Instrument CLUSter
CMP Camshaft position
CTEL Cellular TELephone
CTP Closed Throttle Position (idle)
D+ Generator 'running' signal (same as 61)
DAS Drive Authorization System
DFA Speed signal output
DFAHL Left rear VSS output
DFAVL Left front VSS output
DFHL Left rear VSS sensor
DFHR Right rear VSS output
DFVL Left front VSS output
DFVR Right front VSS output
DI Distributor Ignition system
DIAG DIAGnostic connection
DIAGN DIAGNostic connection
DM Diagnostic Module
DSV Drive authorization System shut-off Valve
DTC Diagnostic Trouble Code
EA Electronic Accelerator
EBR Engine Braking Regulation
ECL Engine Coolant Level
ECT Engine Coolant Temperature
EDC Electronic Diesel Control
EDR Electronic Diesel Regulation
EDS Electronic Diesel System
EGR Exhaust Gas Recirculation
EIFI Electric In-line Fuel Injection
EMSC Electric Mirror, Steering Column adjustment, heated mirrors
EPC Electronic Powertrain Control
ESA Electric Seat Adjustment
ESC Electric Steering Column adjustment
ESCM Engine Systems Control Module
ESP Electronic Stability Program
ETC Electronic Transmission Control
ETR Emergency Tensioning Retractor
ETS Electronic Traction System
EVAP EVAPorative emission control system
FA Driver
FAN FANfare horns
FF5 Frame Floor System
FP Fuel Pump
FSA+ Hands-free speaker plus
FSA- Hands-free speaker minus
GD GolD
GES Vehicle speed signal (VSS)
GIM Governor Impulse Method
GN GreeN
GS Seat belt ETR
GY GreY

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Diagrams > Diagram

Information and Instructions > Page 19

S 420 (140.043) V8-4.2L (119.981) (1996)

HCS Headlamp Cleaning System
HFM-SFI HFM Sequential multiport Fuel Injection/ignition system

HFS Hands Free System
HHT Hand-Held Tester
HORN HORN signal system
HS Heated Seats
IAT Intake Air Temperature
IC Instrument Cluster
IDC In-Dash Controller
IFI Electronic In-line Fuel Injection (Diesel)
IND INDicator
INTERV Intermittent wipe
INFO INFOrmation center

IPS Actual value potentiometer signal
IR InfraRed
IRCL Infrared Remote Central Locking
SC Idle Speed Control
IV Input Valve
KS Knock Sensor
KSK Control contact
KSS Knock Sensor System
KU + Clutch +
KU - Clutch ­LA Lamp output (preglow relay)
LED G Green feedback LED
LED R Red feedback LED
LF Left Front
LHS LeftHand Steering
LH-SFI LH-Sequential multiport Fuel Injection system
LS Loudspeaker System
LSK Idle speed safety contact
M + Motor +
M - Motor ­MAF Mass Air Flow
MAP Manifold Absolute Pressure
MB-ISO Diagnostic connector
ME-SFI ME Sequential multiport Fuel Injection/ignition system
MIL Malfunction Indicator Lamp
MOT Motor
MSC Mirror, Steering Column adjustment, heated mirrors
MSK Open throttle safety contact
MUTE Radio MUTE signal
MVA Manifold Vacuum Assist
N Neutral position
O2S Oxygen (02) Sensor
OBD On-Board Diagnostics
OC Oxidation Catalytic converter
OG OranGe
OSB Orthopedic Seat Backrest
OV Output Valve
P Park position
P + Potentiometer + reference
P - Potentiometer - reference
PA Parking Assist
PARK SW PARKing brake SWitch
PK PinK
PL Power Locking
PMP Partial intake Manifold Preheater
PNP Park/Neutral Position
POS POSition
PS Power Steering
PSE Pneumatic System Equipment
PTS ParkTronic System
PWM Pulse Width Modulation
R50 Starter solenoid signal (after starter lockout switch)
RCL Remote Central Locking

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Diagrams > Diagram

Information and Instructions > Page 20

S 420 (140.043) V8-4.2L (119.981) (1996)

RD RaDio
RD ReD

REST Residual engine heaT utilization
RF Right Front
RFCL Radio Frequency Central Locking
RHR Retractable rear Head Restraints
RHS Rear Heated Seats
RPM Revolutions Per Minute (engine speed)
RR Right Rear
RTG Retractable Trunk lid Grip
RTN ReTurN line
RTR Remote Trunk Release
RX Receive

S Shield (unspecified)
S+B Set - Accelerate
S-B Set - Decelerate
SBE Seat Belt Extender
SLO Starter Lock-Out
SMS Service Microfiche System
SN1 Unlocking signal
SN2 Locking signal
SOV SwitchOver Valve
SPS Speed-sensitive Power Steering
SR SilveR
SR Sliding/pop-up sunRoof
SRS Supplemental Restraint System
SS Speed Sensor
SW SWitch
T Temperature input (preglow relay)
TAF Trunk lid Auxiliary Fuse
TAV Tank Aeration Valve
TB Throttle Body
TC TurboCharger
TCM Transmission Control Module
TD Speed signal (Time Division)
TDC Top Dead Center
TELE TELEscoping
TK Door contact
TN Engine RPM signal (unmodified)
TN Speed signal (EZL/AKR)
TNA Engine RPM signal (re-formed)
TQ TurQuoise
TRAP TRAP oxidizer
TRIP TRIP computer
TS Towing Sensor
TRU Transmit-Receive Unit
TVV Tank Vent Valve
TWC Three Way Catalytic converter
TX Transmit
ULLKS Idle speed contact (+ side)
USK Safety contact +
VAF Volume Air Flow
VL Left front
VR Right front
VSS Vehicle Speed Signal
VT VioleT
WA Memory recall (resume)
WH WHite
WOT Wide Open Throttle (full load)
YE YEllow

- Minus
+ Plus
12 VDC Battery voltage or regulator voltage when engine is running
15 Swtiched battery power, hot in positions 2 & 3
15C Switched battery voltage, hot until key is removed

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Diagrams > Diagram

Information and Instructions > Page 21

S 420 (140.043) V8-4.2L (119.981) (1996)

15DIA15g Switched battery voltage, fused
15R Switched battery voltage, hot in positions 1, 2 & 3

15u Switched battery voltage, unfused
15X Switched battery voltage, hot in position 2
15Z Switched battery voltage, hot in positions 2 & 3
30 Unswitched battery power
30a Unswitched battery voltage
30A Unswitched battery voltage, 'A' side
30B Unswitched battery voltage, 'B' side
30E Unswitched battery voltage, for electronics
30Z Switched battery voltage, hot in positions 2 & 3
31 Ground
31e Ground for electronics

49 Flasher signal
49a Pulsed flasher signal
50 Starter solenoid signal
53 Wiper speed low
53b Wiper speed high
54 Brake light signal
54 Brake lamp circuit
56 Tail/parking lamp circuit
56a High beam circuit
56b Low beam circuit
58 General lighting circuit
58d Instrument illumination
58k Instrument illumination, unprocessed
61 Generator 'running' signal
61e Generator 'running' signal
81 Reverse gear signal
81a Reverse gear signal (after transmission switch)
85 Relay control signal
85EDC IFI relay control
85EDC Relay control signal, Electronic Diesel Control
85F Horn relay control
85LP Air pump relay control
86 Relay control signal
86KP Fuel pump relay control
87 Relay output (unspecified)
87ABS Power supply for ABS
87EGAS EA voltage supply
87GES Voltage supply fused
87KP Fuel pump voltage supply
87LP Air pump voltage supply
87MOTR ME-SFI voltage supply
87SA Power supply for optional equipment
87UG Relay output, unfused
87Z Relay output, fused

- 4 -> Indicates number of wires connected to the appropriate terminal block or connector sleeve
* Asterisk marks connector sleeve with not all wires shown

Wiring

CODE COLOR

BK black
BR brown
BU blue
IV ivory
GN green
GY grey
TR neutral/transparent
OR orange
PK pink
RD red
VI purple
WT white

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Diagrams > Diagram

Information and Instructions > Page 22

S 420 (140.043) V8-4.2L (119.981) (1996)

YL yellow

Vacuum

bl = blue
hbl = light blue
drt = dark red
ge = yellow
mgn = medium green
gr = grey
rt = red
ws = white
sw = black

dgn = dark green
gn = green

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Service and Repair

Global Positioning System Module: Service and Repair

Up to 11/96

As of approx. 12/96 the GPS control module (N14/2) is integrated into the navigation module / processor. NOTE:

Quiescent current retention unit

disconnect, connect.

Ground lead on battery

disconnect, connect.

Holder (1)

remove, install.

Electrical connections on control module (N41/2)

disconnect, connect.

Control module (N41/2)

remove from holder (1), install.

Commercially available tester

Quiescent current retention unit e.g. Hans Zeheter CMP 12.2

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Ignition Shut Down Relay (For Antitheft) > Component Information > Locations

Ignition Shut Down Relay (For Antitheft): Locations

Figures 29 thru 33

Figure

29/32/33

Component Name

Starter lock-out relay module

Component ID

K38

Component ID Component Name

K38 Starter lock-out relay module
N42 Left SBE control module
N54 RCL control module

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations

Keyless Entry Module: Locations

Figures 11 thru 15

Figure

12

Component Name

RCL control module

Component ID

N54

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 32

S 420 (140.043) V8-4.2L (119.981) (1996)

Component ID Component Name

K13/1 Rear window defroster relay module
K27 FP relay module
N26 ATA control module
N32/1 Left front ESA control module (with memory)
N32/2 Right front ESA control module (with memory)
N32/12 RHR control module
N40/3 Left/right audio power amplifier
N49/1 SPS control module (engine 120 USA only and California version engines 104/119)
N54 RCL control module
N57 CF control module (power windows, sliding/pop-up roof)

Figures 29 thru 33

Figure

31/32

Component Name

RCL control module

Component ID

N54

Component ID Component Name

K38 Starter lock-out relay module
N42 Left SBE control module

N54 RCL control module

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 33

Keyless Entry Module: Description and Operation

Infrared remote control module (N54) up to 08/95

The control module in the sedan is located on the reinforcement on the right of the trunk. The control module in the coupe is positioned below the leftrear seat. The electrical connection is provided with a plug-in and withdrawal aid. To withdraw, press locking lug and pull up coupling on the cable side.When replacing the control module or the transmitter, always indicate the locking mechanism number since both parts are matched to one another.

Infrared remote control module (N54) as of 09/95

The control module is located at the front right of the firewall behind the passenger airbag (behind airduct).The 12-pin electrical connection is provided with a plug-in and withdrawal aid. To withdraw, press locking lug and fold over clamp. The 2-pin electricalconnection is secured with a lock. Press locking lug and push lock to the side.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 34

Keyless Entry Module: Service and Repair

2nd version as of 09/95

A pillar trim in bottom of passenger footwell

Remove, install.

Cover with recirculated air filter (2)

Remove, install.

Screw (arrow)

Take off, screw on.

Electric couplings

Disconnect, connect

NOTE

: The 12-pin connector is provided with a plug-in and withdrawal aid. To withdraw, press locking catch and fold over bar.The 2-pin connector is secured with a lock. To disconnect, press locking catch and push lock to the side.

Control module (N54)

Remove, insert.

NOTE:

When replacing the control module or the transmitter key, always quote the locking mechanism number, since these two components are tunedto each other.After replacing the control module, perform version coding as stated in diagnosis manual.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Navigation Module > Component Information > Service and Repair

Navigation Module: Service and Repair

Navigation processor up to approx. 11/96

Navigation processor as of approx. 12/96

CD-ROM in navigation processor

remove (only when replacing navigation processor).

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Navigation Module > Component Information > Service and Repair > Page 38

S 420 (140.043) V8-4.2L (119.981) (1996)

Quiescent current retention unit

disconnect, connect.

Ground cable at battery

disconnect, connect.

Holder (1)

remove, install.

Electrical connections on rear of navigation processor (A2/3O)

disconnect, connect.(only for vehicles as of approx. 12/96)

Electrical connections on control module

disconnect, connect.(only for vehicles up to approx. 11/96)

Navigation processor

remove from holder (1) together with CD-ROM drive (A2/30), install

Before installing a new navigation processor with CD-ROM drive, remove transport lock.NOTE:
NOTE:

When replacing the navigation processor with CD-ROM drive (A2/3O) the system must be put into operation, because it is necessary tostore specific vehicle data. For vehicles with navigation processor up to 11/96 a test CD is required for this purpose.

Activation of the language requires approx. .30 minutes

Commercially available tester

Quiescent current retention unit e.g. Hans Zeheter CMP 12.2

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Parking Assist Control Module > Component Information > Service and Repair

Parking Assist Control Module: Service and Repair

Quiescent current retention unit

disconnect, connect.

Ground lead on battery

disconnect, reconnect

Rear seat

remove, install

Control module (N62)

remove, install.

Erase fault memory and/or code control module.NOTE:

Commercially available tester

Quiescent current retention unit

e.g. Hans Zeheter CMP 12.2

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Turn Signals/Headlamps ON, Ignition Turned OFF

Relay Module: Technical Service BulletinsTurn Signals/Headlamps ON, Ignition Turned OFF

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Turn Signals/

Headlamps ON, Ignition Turned OFF > Page 46

S 420 (140.043) V8-4.2L (119.981) (1996)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Page 47

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations

Keyless Entry Module: Locations

Figures 11 thru 15

Figure

12

Component Name

RCL control module

Component ID

N54

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 52

S 420 (140.043) V8-4.2L (119.981) (1996)

Component ID Component Name

K13/1 Rear window defroster relay module
K27 FP relay module
N26 ATA control module
N32/1 Left front ESA control module (with memory)
N32/2 Right front ESA control module (with memory)
N32/12 RHR control module
N40/3 Left/right audio power amplifier
N49/1 SPS control module (engine 120 USA only and California version engines 104/119)
N54 RCL control module
N57 CF control module (power windows, sliding/pop-up roof)

Figures 29 thru 33

Figure

31/32

Component Name

RCL control module

Component ID

N54

Component ID Component Name

K38 Starter lock-out relay module
N42 Left SBE control module

N54 RCL control module

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 53

Keyless Entry Module: Description and Operation

Infrared remote control module (N54) up to 08/95

The control module in the sedan is located on the reinforcement on the right of the trunk. The control module in the coupe is positioned below the leftrear seat. The electrical connection is provided with a plug-in and withdrawal aid. To withdraw, press locking lug and pull up coupling on the cable side.When replacing the control module or the transmitter, always indicate the locking mechanism number since both parts are matched to one another.

Infrared remote control module (N54) as of 09/95

The control module is located at the front right of the firewall behind the passenger airbag (behind airduct).The 12-pin electrical connection is provided with a plug-in and withdrawal aid. To withdraw, press locking lug and fold over clamp. The 2-pin electricalconnection is secured with a lock. Press locking lug and push lock to the side.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 54

Keyless Entry Module: Service and Repair

2nd version as of 09/95

A pillar trim in bottom of passenger footwell

Remove, install.

Cover with recirculated air filter (2)

Remove, install.

Screw (arrow)

Take off, screw on.

Electric couplings

Disconnect, connect

NOTE

: The 12-pin connector is provided with a plug-in and withdrawal aid. To withdraw, press locking catch and fold over bar.The 2-pin connector is secured with a lock. To disconnect, press locking catch and push lock to the side.

Control module (N54)

Remove, insert.

NOTE:

When replacing the control module or the transmitter key, always quote the locking mechanism number, since these two components are tunedto each other.After replacing the control module, perform version coding as stated in diagnosis manual.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Technical Service Bulletins > Alarm - DAS/Non-DAS Vehicles Diagnosis

Technical Service Bulletin # 80_006

Alarm - DAS/Non-DAS Vehicles Diagnosis

REF. NO. MBNA 80/6
DATE: February 1996
TO: ALL MERCEDES-BENZ PASSENGER CAR DEALERS

SUBJECT: MODEL YEAR 1996 VEHICLESA.

MODELS 140, 210 WITHOUT DRIVE AUTHORIZATION SYSTEM (DAS)Hand-Held Tester (HHT) DiagnosisRemote Central Locking (RCL) Control Module (N54) NotesReplacing Engine Control Module

B.

MODELS 129, 140, 202, 210 WITH DASOperational Description - DASTroubleshooting Flowchart - Engine Does Not StartTroubleshooting Chart - RCL

Parts Information
^

When replacing the engine control module on vehicles without DAS, both engine control module and RCL control module must be replaced. Refer topart numbers.

^ When replacing RCL control module only, replace with the same part number RCL control module removed from vehicle.

In Case of Warranty

A. Vehicles Without Drive Authorization System (DAS)

A limited number of early Model Year 1996 model 140 and 210 vehicles were produced without DAS. In these vehicles, both the engine control module(HFM-SFI [N3/4], ME-SF [N3/10], or IFI [N3/7]) and the RCL control module (N54) are different from the versions used in vehicles equipped withDAS.

Effective Serial Number

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Technical Service Bulletins > Alarm - DAS/

Non-DAS Vehicles Diagnosis > Page 59

S 420 (140.043) V8-4.2L (119.981) (1996)

As of the chassis numbers listed (approx. 9/95), the engine control module (HFM-SFI, ME-SFI, or F1) and remote central locking (RCL) controlmodules installed in production may be different from the standard version having DAS. (The vehicles with these differences are positively identified bylocking vehicle with RCL remote control from the inside of the vehicle, if the vehicle does not start it is equipped with DAS. On new vehicles, a $ 475credit is shown on the Monroney label if the vehicle is NOT equipped with DAS.)
The ending VIN's for this change have not yet been established, as the program remains in effect at the factory.

Hand-Held Tester (HHT) Diagnosis
The following DTC's are set, and cannot be erased, on vehicles not equipped with DAS (verified as mentioned in subject A):
RCL B1102, B1703

HFM-SFI 116
ME-SFI P1 570

Additionally, in the HFM-SFI, ME-SFI and IFI systems, the Actual Values for the DAS system should be ignored and the "Identification" procedure(refer to "Operational Description of DAS", subject B) cannot be performed.
Remote Central Locking (RCL) Control Module (N54) Notes

In event the HHT cannot access the version coding menu (error message: the vehicle is locked via RCL) after replacing the RCL module (N54), accesscan be restored by performing the version coding on the engine control module. Enter the version coding screen for the engine control module, writedown the information and perform all steps as if the module was being replaced. Enter the version code (also available from the parts microfiche/EPC)and VIN (without the WDB) as directed and answer Yes to "Perform Identification?". Once this step is completed, the RCL version coding can beperformed. When performing diagnosis according to the Diagnostic Manual (Body & Accessories, Volume 1, Section 4.5), first check the part number ofthe RCL control module (N54) using the HHT. If part number 210 820 28 26 is installed, diagnosis differs as follows:
^

The red and green feedback lamps flash only once alternately, not for 30 seconds when the vehicle is locked, as described in chapter 11 of theDiagnostic Manual.
^ Data is not transmitted between the engine control module and RCL as described in chapter 12.
^ The engine control module and RCL module are not connected via CAN as described in chapter 21.
^ The following test steps are not valid:
Chapter 11, steps 5.0 and 6.0 Chapter 23, steps 21.0 through 30.0

:Note

If the RCL control module is identified as 210 820 27 26, these differences do not apply. When replacing only the RCL control module (i.e. not inconjunction with the engine control module), order the same part number as is installed in the vehicle. As these modules are programmed to thespecific VIN, delivery may take 2-3 weeks. When replacing the engine control module, please refer to the procedure below.
Replacing Engine Control Module

:Note

Installation of the new RCL and engine control module will result in equipping the vehicle with DAS.
Removing and Installing RCL control module.

(Model 210 shown. In Model 140, RCL module located high in right upper corner of passenger footwell, forward of passenger A/C vent, againstfirewall.)

:Note

This procedure is only necessary when replacing the RCL control module in conjunction with the engine control module. When replacing only theRCL module, use all original connectors.

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Non-DAS Vehicles Diagnosis > Page 60

S 420 (140.043) V8-4.2L (119.981) (1996)

In the event an engine control module must be replaced in a vehicle produced without DAS (verified as mentioned in subject A), a new engine controlmodule with a different part number, along with a new RCL control module, also with a different part number (210 820 27 26) coded to the specificVIN, must be ordered. Both control modules must be replaced simultaneously. Refer to the parts microfiche/EPC to determine the correct replacementparts.

1. Press down on locking tab (1, Figure 1) and slide lock (2) to the side.

2.

Disconnect 2-pole connector (3, Figure 1) from RCL control module (N54), insulate and tie back (this connector is no longer used). Remove mainRCL connector

3.

Remove original RCL control module (part no. 210 820 2826) and install new RCL control module (part no. 210 820 2726). Connect main RCLconnector.

4.

Expose the 2-pole CAN bus connector (5, Figure 2) which is tied back in the area of the RCL control module, or beneath the module box. Thisconnector looks like the one removed in Step 2, but has a terminating resistor plug on it.

5. Disconnect the bus terminating resistor plug (4, Figure 2) from the 2-pole CAN Bus connector and discard.

6. Connect the 2-pole CAN Bus connector (5, Figure 2) to the new RCL control module.

7.

Perform variant coding of the RCL control module via the HHT. In event the HHT does not access the version coding menu, refer to RCL ControlModule Notes under subject A.

8.

After installing new engine control module, perform version coding, enter VIN, and perform "identification procedure". Verify that vehicle startswhen unlocked, and does not start when locked with RCL or key.

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Non-DAS Vehicles Diagnosis > Page 61

S 420 (140.043) V8-4.2L (119.981) (1996)

B. Vehicles With DAS

As of Model Year 1996, all models (excluding models mentioned, under subject A) are equipped with the Drive Authorization System (DAS). Thissystem increases the theft resistance of the vehicle by disabling fuel injection if the vehicle is not properly unlocked, either via the RCL system or withthe key. This system uses the CAN Bus to transfer data from the RCL control module to the engine control module during each starting attempt.
Operational Description - DAS

This operational description applies to all vehicles with DAS. Vehicles described under subject A are not equipped with DAS, therefore this descriptiondoes not apply.
The RCL module is programmed by the manufacturer with a specific Identification (ID) number, which is cross-referenced by Mercedes-Benz to a

specific Vehicle Identification Number (VIN). This ID number remains with a specific VIN for the life of the vehicle, and must not be changed (forexample, by installing the module from another vehicle to expedite a repair). From this ID number, a certain code number is calculated.

When first installed, the engine control module has no information about the RCL system's code. At the time of installation, the engine control modulemust be version coded, which includes a 9-digit engine type code (obtained from the old module, or the parts microfiche/EPC), and the vehicle's VIN(without the WDB). Once the version coding (performed with the HHT) is completed, the identification process must be performed. This procedure isperformed by following the screen prompts on the HHT. In this identification procedure, the engine control module learns the RCL code number. If"Identification" is not performed, the vehicle will not start.

After "Identification", the engine control module begins counting the number of engine starts (where the engine speed exceeds approx. 500 RPM - notstarting attempts). When this count reaches a specified number (40), the engine control module stores the RCL code permanently, and then ispermanently "married" to that specific vehicle. If desired, the "marriage" can be forced to occur immediately, using the HHT. Until the marriage processis complete, the module can be version coded for another vehicle as often as desired. At each recoding, the counter begins again from zero.

Once the engine control module has completed the identification process, the DAS system is operational. The process followed by DAS for authorizing astarting attempt proceeds as follows:

When circuit 15 (ignition) is switched on, the engine control module generates a random number. This number is sent to the RCL module via the CANBus. The engine control module uses this random number along with the code number to calculate an authorization number. At the same time, the RCLmodule performs the same calculation with the random number and the code number. The RCL sends the resulting authorization number back to theengine control module, which compares it with the number it calculated. If the authorization numbers match (meaning the code numbers also match), thestarting attempt is "authorized", and fuel injection is permitted, allowing the engine to start. At the same time, if the numbers match, the engine controlmodule sends a message via CAN Bus to the RCL, confirming that the start is authorized.

If the numbers did not match, fuel injection is disabled (the engine will not start), and no message is sent to RCL. When the RCL sees circuit 50 (startersolenoid signal), it checks if a message was received authorizing the start, and if no message was received, the red and green lamps in the rearview mirrorare flashed alternately. Of course, if the start is authorized, then the RCL takes no action.
Troubleshooting Flowchart - Engine Does Not Start

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Non-DAS Vehicles Diagnosis > Page 62

S 420 (140.043) V8-4.2L (119.981) (1996)

Use this troubleshooting flowchart to determine which vehicle system (engine control module [ECM] or RCL) must be diagnosed to resolve complaintsof "Engine Cranks but Does Not Start". Refer tot he Diagnostic Manual for complete diagnostic tests.

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S 420 (140.043) V8-4.2L (119.981) (1996)

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Non-DAS Vehicles Diagnosis > Page 66

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Troubleshooting Chart - RCLUse this troubleshooting table to determine with specific portion of the RCL system may have a fault.

> Relays and Modules > Relays and Modules - Body and Frame > Power Mirror Control Module > Component Information > Locations

Power Mirror Control Module: Locations

Figures 1 thru 5

Figure

1

Component Name

MSC control module (with memory)

Component ID

N32/9

Component ID Component Name

A7 ABS hydraulic unit
A7k1 Solenoid valve relay
A7k2 Return pump/pressure pump relay
A7/3 ASR/ETS/ESP hydraulic unit
A7/3k1 Solenoid valve relay
A7/3k2 High-pressure/return pump relay
K26 Wiper system relay module
N2/1 ETR control module
N2/2 SRS control module
N32/9 MSC control module (with memory)

> Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Locations > ESA Control Module

Power Seat Control Module: LocationsESA Control Module

Left Front

Figures 11 thru 15

> Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Locations > ESA Control Module > Page 74

S 420 (140.043) V8-4.2L (119.981) (1996)

Figure

14

Component Name

Left front ESA control module (with memory)

Component ID

N32/1

Component ID Component Name

K13/1 Rear window defroster relay module
K27 FP relay module
N26 ATA control module
N32/1 Left front ESA control module (with memory)
N32/2 Right front ESA control module (with memory)
N32/12 RHR control module
N40/3 Left/right audio power amplifier

N49/1 SPS control module (engine 120 USA only and California version engines 104/119)
N54 RCL control module
N57 CF control module (power windows, sliding/pop-up roof)

Right Front

Figures 11 thru 15

> Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Locations > ESA Control Module > Page 75

S 420 (140.043) V8-4.2L (119.981) (1996)

Figure

11

Component Name

Right front ESA control module (with memory)

Component ID

N32/2

Component ID Component Name

K13/1 Rear window defroster relay module
K27 FP relay module
N26 ATA control module
N32/1 Left front ESA control module (with memory)
N32/2 Right front ESA control module (with memory)
N32/12 RHR control module
N40/3 Left/right audio power amplifier

N49/1 SPS control module (engine 120 USA only and California version engines 104/119)
N54 RCL control module
N57 CF control module (power windows, sliding/pop-up roof)

With Right Front Seat Adjustment Feature

Figures 16 thru 20

Figure

20

Component Name

Right rear ESA control module (with right front seat adjustment feature)

Component ID

N32/11

Component ID Component Name

K18/4 Left front seat belt comfort feature solenoid
K18/5 Right front seat belt comfort feature solenoid
K18/6 Left rear seat belt comfort feature solenoid
N29/2 Rear electronic blower regulator
N32/11 Right rear seat adjustment control module (with right front seat adjustment feature)
K18/7 Right rear seat belt comfort feature solenoid

> Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Locations > ESA Control Module > Page 76

Power Seat Control Module: LocationsRHR Control Module

Figures 11 thru 15

Figure

15

Component Name Rear Retractable Head Rest () control moduleRHR
Component ID

N32/12

> Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Locations > ESA Control Module > Page 77

S 420 (140.043) V8-4.2L (119.981) (1996)

Component ID Component Name

K13/1 Rear window defroster relay module
K27

Fuel Pump () relay moduleFP

N26

Anti-theft Alarm () control moduleATA

N32/1

Left front Electric Seat Adjustment () control module (with memory)ESA

N32/2

Right front Electric Seat Adjustment () control module (with memory)ESA

N32/12 RHR control module
N40/3 Left/right audio power amplifier
N49/1 SPS control module (engine 120 USA only and California version engines 104/119)
N54

Remote Central Locking () control moduleRCL

N57

Convenience Feature () control module (power windows, sliding/pop-up roof)CF

Figures 21 thru 23

Figure

21

Component Name

RHR control module

Component ID

N32/12

Component ID Component Name

A37

Pneumatic control module (pneumatic retractable rear head restraints, central locking, backup assist, retractable trunk lid grip,orthopedic seat backrest and vacuum)
A37/1 Pneumatic control module (central locking, backup assist, retractable trunk lid grip, orthopedic seat backrest and vacuum)
K27/1 Fuel pump 1 and 2 relay module 1
K27/2 Fuel pump 1 and 2 relay module 2
N25/5 Front seat heater control module
N25/6 Rear seat heater control module
N32/12 Rear head restraint control module

> Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Locations > ESA Control Module > Page 78

S 420 (140.043) V8-4.2L (119.981) (1996)

Figures 42 thru 45

Figure

44

Component Name

RHR control module

Component ID

N32/12

Component ID Component Name

A37 PSE control moduleK13/1 Rear window defroster relay module
K27/1 FP 1 and 2 relay module 1
K27/2 FP 1 and 2 relay module 2
N25/5 Front HS control module
N25/6 Rear HS control module
N32/12 RHR control module
N57 CF control module (power windows, sliding/pop-up roof)
N62 Ultrasonic PTS control module
N65/1 AIR control module

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Locations > Front

Seat Heater Control Module: LocationsFront

Figures 21 thru 23

Figure

21

Component Name

Front HS control module

Component ID

N25/5

Component ID Component Name

A37

Pneumatic control module (pneumatic retractable rear head restraints, central locking, backup assist, retractable trunk lid grip,orthopedic seat backrest and vacuum)
A37/1 Pneumatic control module (central locking, backup assist, retractable trunk lid grip, orthopedic seat backrest and vacuum)
K27/1 Fuel pump 1 and 2 relay module 1
K27/2 Fuel pump 1 and 2 relay module 2
N25/5 Front seat heater control module

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Locations > Front > Page 83

S 420 (140.043) V8-4.2L (119.981) (1996)

N25/6 Rear seat heater control module

N32/12 Rear head restraint control module

Figures 42 thru 45

Figure

44

Component Name

Front HS control module

Component ID

N25/5

Component ID Component Name

A37 PSE control moduleK13/1 Rear window defroster relay module
K27/1 FP 1 and 2 relay module 1
K27/2 FP 1 and 2 relay module 2
N25/5 Front HS control module
N25/6 Rear HS control module
N32/12 RHR control module
N57 CF control module (power windows, sliding/pop-up roof)
N62 Ultrasonic PTS control module
N65/1 AIR control module

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Locations > Front > Page 84

Seat Heater Control Module: LocationsRear

Figures 21 thru 23

Figure

21

Component Name

Rear HS control module

Component ID

N25/6

Component ID Component Name

A37

Pneumatic control module (pneumatic retractable rear head restraints, central locking, backup assist, retractable trunk lid grip,orthopedic seat backrest and vacuum)
A37/1 Pneumatic control module (central locking, backup assist, retractable trunk lid grip, orthopedic seat backrest and vacuum)
K27/1 Fuel pump 1 and 2 relay module 1
K27/2 Fuel pump 1 and 2 relay module 2
N25/5 Front seat heater control module

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Control Module > Component Information > Locations > Front > Page 85

S 420 (140.043) V8-4.2L (119.981) (1996)

N25/6 Rear seat heater control module

N32/12 Rear head restraint control module

Figures 42 thru 45

Figure

44

Component Name

Rear HS control module

Component ID

N25/6

Component ID Component Name

A37 PSE control moduleK13/1 Rear window defroster relay module
K27/1 FP 1 and 2 relay module 1
K27/2 FP 1 and 2 relay module 2
N25/5 Front HS control module
N25/6 Rear HS control module
N32/12 RHR control module
N57 CF control module (power windows, sliding/pop-up roof)
N62 Ultrasonic PTS control module
N65/1 AIR control module

> Relays and Modules > Relays and Modules - Body and Frame > Sunroof / Moonroof Module > Component Information > Locations

Sunroof / Moonroof Module: Locations

Figures 11 thru 15

Figure

12

Component Name

CF control module (power windows, sliding/pop-up roof)

Component ID

N57

> Relays and Modules > Relays and Modules - Body and Frame > Sunroof / Moonroof Module > Component Information > Locations > Page 89

S 420 (140.043) V8-4.2L (119.981) (1996)

Component ID Component Name

K13/1 Rear window defroster relay module
K27 FP relay module
N26 ATA control module
N32/1 Left front ESA control module (with memory)
N32/2 Right front ESA control module (with memory)
N32/12 RHR control module
N40/3 Left/right audio power amplifier
N49/1 SPS control module (engine 120 USA only and California version engines 104/119)
N54 RCL control module
N57 CF control module (power windows, sliding/pop-up roof)

Figures 42 thru 45

Figure

42

Component Name

CF control module (power windows, sliding/pop-up roof)

Component ID

N57

Component ID Component Name

A37 PSE control module
K13/1 Rear window defroster relay module
K27/1 FP 1 and 2 relay module 1
K27/2 FP 1 and 2 relay module 2
N25/5 Front HS control module
N25/6 Rear HS control module
N32/12 RHR control module
N57 CF control module (power windows, sliding/pop-up roof)
N62 Ultrasonic PTS control module
N65/1 AIR control module

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