Volvo 850 (1994) Wiring Diagrams

Contents
How to use the diagrams ................................................................ 2
Fuses ............................................................................................... 4
Ignition switch and central electrical unit ......................................... 5
Relays outside the central electrical unit ......................................... 6
Connectors ...................................................................................... 7
Wiring harness and connectors
Overview, LHD cars ......................................................................... 26
Wiring harness and connectors
Overview, RHD cars ........................................................................ 27
Harness placement in car ............................................................... 28
Ground connections ........................................................................ 34
Group 23/28
Multiport fuel injection (MFI), LH 3.2 & EZ 129 K ........................... 36
Multiport fuel injection (MFI) system, Fenix 5.2 .............................. 38
Sequential fuel injection (SFI) system, Motronic 4.3 ....................... 40
Group 26
Engine cooling fan (EZ 129 K DI) ................................................... 42
Engine cooling fan (Fenix 5.2, Motronic 4.3 SFI) ............................ 44
Group 27
Cruise control .................................................................................. 46
Group 32/33
Charging circuit and starting system ............................................... 48
Group 35
High and low beams ........................................................................ 50
High and low beams, DIM-DIP (GB) ............................................... 52
Beam width control .......................................................................... 54
Parking lights, tail lights and number plate lights, 4-door ................ 56
Parking lights, tail lights and number plate lights, 5-door ................ 58
Brake lights, 4-door ......................................................................... 60
Brake lights, 5-door ......................................................................... 62
Backup (reversing) lights ................................................................. 64
Rear fog lights ................................................................................. 66
Inside lighting, 4-door ...................................................................... 68
Inside lighting, 5-door ...................................................................... 70
Instrument and control lighting ........................................................ 72
Group 36
Turn signal / hazard lights, 4-door ................................................... 74
Turn signal / hazard lights, 5-door ................................................... 76
Horn ................................................................................................. 78
Windshield and headlight wash/wipe .............................................. 80
Tailgate wash/wipe .......................................................................... 82
Cigar lighter ..................................................................................... 84
Anti-theft alarm, 4-door ................................................................... 86
Anti-theft alarm, 5-door ................................................................... 88
Group 37
Electrical circuitry ............................................................................ 90
On-board diagnostic system (OBD system) .................................... 92
Pre-routed wiring for accessories .................................................... 94
Group 38
Bulb malfunction indicator ............................................................... 96
Seat belt reminder ........................................................................... 98
Seat belt and key reminder, USA, Canada, Korea ..........................100
Combined instrument, VDO ............................................................102
Combined instrument, Yasaki ..........................................................106
Clock module/ambient temp. and clock module/trip computer
(combined instrument VDO) ............................................................110
Clock module/ambient temp. and clock module
(combined instrument Yasaki) ..........................................................112
Oil level and oil pressure sensors ...................................................114
Group 39
Radio, 4-door ...................................................................................116
Radio, 5-door ...................................................................................118
Group 43
AW 50-42 electronically controlled automatic transmission
(LH 3.2 & EZ 129 K MFI & DI) ........................................................120
AW 50-42 electronically controlled automatic transmission
(Fenix 5.2 MFI) ................................................................................122
AW 50-42 electronically controlled automatic transmission
(Motronic 4.3 SFI) ............................................................................124
P-shift lock, automatic transmission ................................................126
Group 59
ABS brake system and TRACS .......................................................128
Group 83
Power windows ................................................................................130
Central locking, 4-door ....................................................................132
Central locking, 5-door ....................................................................134
Central locking with deadlock, 4-door .............................................136
Central locking with deadlock, 5-door .............................................138
Power sunroof ..................................................................................140
Group 84
Heated rear window and door mirrors .............................................142
Power door mirrors ..........................................................................144
Group 85
Electrically heated seats ..................................................................146
Heated rear seat ..............................................................................148
Power seat with memory .................................................................150
Group 87
Heater fan ........................................................................................152
Manual climate unit MCC (LH 3.2 & EZ 129 K) ..............................154
Manual climate unit MCC (Fenix 5.2 MFI, Motronic 4.3 SFI) ..........156
Electronic climate unit ECC (LH 3.2 & EZ 129 K) ...........................158
Electronic climate unit EZZ (Fenix 5.2 MFI and Motronic 4.3 SFI) ....160
Exhaust temperature sensor (Japan) ..............................................162
Group 88
Supplemental Restraint System (SRS) ...........................................164
Supplemental Restraint System (SRS), USA/Canada ....................166
Comments .......................................................................................168
Component list (fold-out) .............................................. at end of book
Alphabetical index ......................................................... at end of book
Order no. TP 3903032 (UK) Order no. TP 3903202 (USA/CDN)
Supersedes TP 3903031 Supersedes TP 3903201
We reserve the right to make alterations without prior notification.
1

Alphabetical index
ABS brake system and TRACS ............................................................................. 128
Accessories ............................................................................................................ 94
Ambient temperature module ......................................................................... 110, 112
Anti-theft alarm .................................................................................................. 86, 88
Automatic transmission .......................................................................... 120, 122, 124
Backup (reversing) lights ........................................................................................ 64
Beam width control ................................................................................................ 54
Brake lights .........................................................................................................60, 62
Bulb malfunction indicator ...................................................................................... 96
Central electrical unit ............................................................................................. 5
Central locking .............................................................................. 132, 134, 136, 138
Charging circuit and starting system ..................................................................... 48
Cigar lighter ............................................................................................................ 84
Climate unit ................................................................................... 154, 156, 158, 160
Clock module .................................................................................................. 110, 112
Combined instrument ..................................................................................... 102, 106
Component list (fold-out) ............................................................... at the end of book
Connectors ................................................................................................... 7, 26, 27
Control lighting ....................................................................................................... 72
Cruise control ......................................................................................................... 46
DIM-DIP headlights ................................................................................................ 52
Electrical circuitry ................................................................................................... 90
Engine cooling fan ............................................................................................ 42, 44
Exhaust temperature sensor (Japan) ..................................................................... 162
EZ 129 K Distributor Ignition (DI) system .............................................................. 36
Fenix 5.2 (MFI) ....................................................................................................... 38
Fuel system ................................................................................................ 36, 38, 40
Fuses ..................................................................................................................... 4, 5
Ground connections ............................................................................................... 34
Hazard warning flashers .................................................................................... 74, 76
Headlight beam width control ................................................................................. 54
Headlight wash/wipe .............................................................................................. 80
Heated rear seats .................................................................................................. 148
Heated rear window and door mirrors ................................................................... 142
Heated seats .......................................................................................................... 146
Heater fan .............................................................................................................. 152
High beam ......................................................................................................... 50, 52
Horn ....................................................................................................................... 78
How to use the diagrams ....................................................................................... 2
Ignition lock and central electrical unit, fuses and relays ....................................... 5
Ignition system ............................................................................................ 36, 38, 40
Instrument and control lighting ............................................................................... 72
Interior courtesy lighting .................................................................................... 68, 70
Key warning .......................................................................................................... 100
LH-jetronic 3.2 ........................................................................................................ 36
Low beam ........................................................................................................... 50, 52
Motronic 4.3 ........................................................................................................... 40
Number plate lights ............................................................................................ 56, 58
Oil level and oil pressure sensors .......................................................................... 114
On-board diagnostic (OBD) system ....................................................................... 92
P-shift lock, automatic transmission ....................................................................... 126
Parking lights ..................................................................................................... 56, 58
Power door mirrors ................................................................................................. 144
Power seat ............................................................................................................. 150
Power sunroof ........................................................................................................ 140
Power supply .......................................................................................................... 48
Power windows ...................................................................................................... 130
Radio .............................................................................................................. 116, 118
Rear foglights ......................................................................................................... 66
Rear window wash/wipe ......................................................................................... 82
Relays .................................................................................................................... 5, 6
Seat belt reminder .......................................................................................... 98, 100
SRS Supplemental Restraint System .............................................................164, 166
Starting system ...................................................................................................... 48
Tail lights ............................................................................................................ 56, 58
TRACS ................................................................................................................... 128
Trip computer ......................................................................................................... 110
Turn signals ........................................................................................................ 74, 76
Windshield wash/wipe ............................................................................................ 80
Wiring harness location in the car ............................................................... 26, 27, 28