Contents

How to use the diagrams ................................................................ 2

Central electrical unit:

Fuses ............................................................................................... 4

Relays .............................................................................................. 6

Connection on rails .......................................................................... 6

Location of relays outside the central electrical unit ....................... 7

Ignition switch .................................................................................. 7

Cable harnesses and connectors

Left-hand drive cards - Overview .................................................... 8

Cable harnesses and connectors

Right-hand drive cars - Overview .................................................... 9

Connectors ...................................................................................... 10

Routing of cable harnesses in the car ............................................. 25

Branching points .............................................................................. 32

Electrical distribution unit ................................................................. 48

Ground points .................................................................................. 50

Group 23/28

Multiport fuel injection (MFI) system, LH-jetronic 3.2

& EZ 129 K ...................................................................................... 54

Multiport fuel injection (MFI) system, Fenix 5.2 .............................. 56

Sequential fuel injection (SFI) system, Motronic 4.3

(B 5204 T, B 5234 T/T5) .................................................................. 60

Sequential fuel injection (SFI) system, Motronic 4.3

(B 5254 S) ....................................................................................... 64

Sequential fuel injection (SFI) system, Motronic 4.4

(B 5254 S) ....................................................................................... 68

Group 26

Engine cooling fan (EZ 129 K) ........................................................ 72

Engine cooling fan (Fenix 5.2, Motronic 4.3/4.4) ............................. 74

Group 27

Cruise control .................................................................................. 76

Group 32/33

Charging circuit and starting system ............................................... 78

Group 35

High and low beams ........................................................................ 80

High and low beams, DIM-DIP (GB) ............................................... 82

Beam length control ........................................................................ 84

Fog lights ......................................................................................... 86

Parking lights, tail lights and license plate lights,

4-door .............................................................................................. 88

Parking lights, tail lights and license plate lights,

5-door .............................................................................................. 90

Stop (brake) lights, 4-door ............................................................... 92

Stop (brake) lights, 5-door ............................................................... 94

Back-up (reversing) lights ................................................................ 96

Interior light, 4-door ......................................................................... 98

Interior light, 5-door .........................................................................100

Instrumentation and control lighting ................................................102

Group 36

Turn signal / hazard lights, 4-door ...................................................104

Turn signal / hazard lights, 5-door ...................................................106

Horn .................................................................................................108

Windshield and headlight wash/wipe ..............................................110

Tailgate wash/wipe ..........................................................................112

Cigar lighter .....................................................................................114

Basic alarm ......................................................................................116

Guard Alarm II, early type ..............................................................118

Guard Alarm II, late type .................................................................120

Electronic start inhibitor (Immobilizer) .............................................122

Group 37

On-board diagnostic system (OBD system) ....................................124

Wiring for accessories .....................................................................126

Group 38

Bulb failure warning sensor .............................................................128

Seat belt reminder ...........................................................................130

Seat belt and key reminder, USA, Canada, Korea ..........................132

Seat belt and key reminder, Australia ..............................................134

Combined instrument panel, VDO ...................................................136

Combined instrument panel, Yasaki ................................................140

Clock module/outside temp. and clock module/trip computer

(Combined instrument panel, VDO) ................................................144

Clock module/outside temp. and clock module

(Combined instrument panel, Yasaki) ..............................................146

Group 39

Radio, 4-door ...................................................................................148

Radio, 5-door ...................................................................................150

Radio with extra amplifier, 4-door ....................................................152

Radio with extra amplifier, 5-door ....................................................154

Group 43

AW 50-42 electronically controlled automatic transmission

(LH 3.2 & EZ 129 K) ........................................................................156

AW 50-42 electronically controlled automatic transmission

(Fenix 5.2, Motronic 4.3/4.4) ...........................................................158

P-shift lock, automatic transmission ................................................160

Group 59

ABS Brake system and TRACS ......................................................162

Group 83

Power windows, Left-hand drive cars ..............................................164

Power windows, Right-hand drive cars ...........................................166

Central locking, 4-door ....................................................................168

Central locking, 5-door ....................................................................170

2-stage central locking, 4-door ........................................................172

2-stage central locking, 5-door ........................................................174

Central locking with deadlock, 4-door .............................................176

Central locking with deadlock, 5-door .............................................178

Power sunroof ..................................................................................180

Group 84

Heated rear window and door mirrors .............................................182

Power door mirrors ..........................................................................184

Group 85

Electrically heated seats ..................................................................186

Heated rear seat ..............................................................................188

Power seat with memory .................................................................190

Group 87

Blower fan ........................................................................................192

Manual climate unit MCC (LH 3.2 & EZ 129 K) ..............................194

Manual climate unit MCC (Fenix 5.2, Motronic 4.3/4.4) ..................196

Electronic climate unit ECC (LH 3.2 & EZ 129 K) ...........................198

Electronic climate unit ECC (Fenix 5.2, Motronic 4.3/4.4) ..............200

Exhaust temperature sensor (Japan) ..............................................202

Group 88

SRS Supplemental Restraint System (SRS) ...................................204

Function diagrams ...........................................................................206

Comments .......................................................................................227

Component list (fold-out) ............................................... at end of book

Alphabetical index ......................................................... at end of book

Order no. TP 3911032 (UK) Order no. TP 3911202 (USA/CDN)

Supersedes TP 3911031 Supersedes TP 3911201

We reserve the right to make alterations without prior notification.

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Index

Accessory wiring .............................................................. 126

Anti-lock braking system ABS .......................................... 162

Automatic Transmission ............................................ 156, 158

Backup (reversing) lights ........................................ 88, 90, 96

Beam width control ............................................................. 84

Blower fan ......................................................................... 192

Branching points ................................................................. 32

Bulb failure warning sensor .............................................. 128

Cable harnesses ........................................................ 8, 9, 25

Car alarm ......................................................... 116, 118, 120

Central locking ......................... 168, 170, 172, 174, 176, 178

Central electronic module ..................................................... 4

Cigarette lighter ................................................................ 114

Climate control unit .................................. 194, 196, 198, 200

Clock module ............................................................ 144, 146

Combined instrument panel ..................................... 136, 140

Connectors ................................................................. 8, 9, 25

Controls lighting ................................................................ 102

Cruise control ..................................................................... 76

Diagnostics ....................................................................... 124

Distribution rails .................................................................... 6

Engine coolant fan FC .................................................. 72, 74

EZ 129 K ............................................................................ 54

Exhaust temperature sensor ............................................ 202

Fenix 5.2 ............................................................................. 56

Fog lights ............................................................................ 86

Fuel injection system ................................. 54, 56, 60, 64, 68

Functions diagram ............................................................ 206

Fuses .................................................................................... 4

Ground point ....................................................................... 50

Hazard flashers ........................................................ 104, 106

Headlamp wash/wipe ....................................................... 110

Heated door mirrors ......................................................... 182

Heated rear window .......................................................... 182

Heated rear seat ............................................................... 188

Heated seats .................................................................... 186

High beam .................................................................... 80, 82

Horn .................................................................................. 108

Ignition switch ....................................................................... 7

Ignition system ........................................... 54, 56, 60, 64, 68

Immobilizer, electronic start inhibitor ................................ 122

Instrument lighting ............................................................ 102

Interior lighting ............................................................ 98, 100

Key warning .............................................................. 132, 134

License (registration) plate lighting .............................. 88, 90

LH Jetronic 3.2 MFI ............................................................ 54

List of components ................................... see end of manual

Low beam (dipped headlights) ..................................... 80, 82

Motronic 4.3 .................................................................. 60, 64

Motronic 4.4 ........................................................................ 68

Outer temperature .................................................... 144, 146

Park/neutral position switch .............................................. 160

Parking lights ................................................................ 88, 90

Power distribution ............................................................... 48

Power windows ......................................................... 164, 166

Power door mirrors ........................................................... 184

Power seat ........................................................................ 190

Power sunroof ................................................................... 180

Power supply ...................................................................... 78

Radio ........................................................ 148, 150, 152, 154

Reduced low beam ............................................................. 82

Relays ............................................................................... 6, 7

Stop (brake) lights ........................................................ 92, 94

Seatbelt reminder ......................................................... 2, 134

SRS Supplementary Restraint System ............................ 204

Starter system .................................................................... 78

Tailgate wash/wipe ........................................................... 112

Trip computer .................................................................... 144

Turn signal indicator ................................................. 104, 106

TRACS .............................................................................. 162

Windshield wash/wipe ...................................................... 110