The BMW 850i (E31) is a luxury grand tourer produced from 1989 to 1999, with the 1991-1992 model years specifically covered. This flagship coupe, powered by a naturally aspirated V12 engine (M70 B50), was designed as a departure from BMW's traditional sporty sedans, emphasizing elegant, timeless styling and driver comfort for affluent individuals. It competed with luxury grand tourers like the Mercedes-Benz SL-Class and Jaguar XJ-S, offering a powerful yet smooth driving experience ideal for long-distance travel. The 850i represented BMW's engineering prowess, showcasing advanced technology and a focus on a refined, luxurious interior.
This comprehensive Electrical Troubleshooting Manual / Wiring Diagram Manual is designed to assist owners, mechanics, and technicians in diagnosing and repairing the complex electrical systems of the BMW 850i (E31) models from 1991-1992. It covers a wide array of systems, including power distribution, engine and transmission control, chassis and safety electronics, comfort and convenience features, instrumentation, and lighting. The manual provides detailed wiring schematics, component location charts, fuse and relay assignments, and step-by-step diagnostic procedures, with a primary focus on electrical systems troubleshooting and circuit analysis. Its advanced technical depth aims to empower users to efficiently resolve electrical faults.
Vehicle Produced 7/91 to 8/92
Index
Introduction
Symbols
Power Distribution Chart
Fuse chart
power Distribution
Fuse Details
Ground Distribution
Data Link
Engine Control System
Charging System
Start
Electronic transmission control
Supplement restraint system
Slip control ABS
Power Mirrors
Centrol locking module
Power Windows
Power Seats
Heated Seats
Power Sun Roof
Horn
Wiperwasher Module
Headlight Washer
Windshield washer jet heaters
Instrument cluster
Multi Function Clock
Light switch details
Headlights/Fog lights
Turnhazard lights
Park/Tail/Underhood lights
Licence plate/luggage compartment lights
Back up lights
Brake Lights
Interior Lights
Glove box light/cassete box ashtry lights/charging socket
Crash Control module
Park, ventilation with HKR
Rear Window defogger
Integrated climate regulation
Radio/Cd player
radio/hifi
Cellular Telephone
Cruise Control tempomat
Anti Theft system
on Board Computer
Component Location Chaart
Component Location Views
Splice Location views
Connector views
Vehicle Produced 7/91 to 8/92
Index
Introduction
Symbols
Power Distribution Chart
Fuse chart
power Distribution
Fuse Details
Ground Distribution
Data Link
Engine Control System
Charging System
Start
Electronic transmission control
Supplement restraint system
Slip control ABS
Power Mirrors
Centrol locking module
Power Windows
Power Seats
Heated Seats
Power Sun Roof
Horn
Wiperwasher Module
Headlight Washer
Windshield washer jet heaters
Instrument cluster
Multi Function Clock
Light switch details
Headlights/Fog lights
Turnhazard lights
Park/Tail/Underhood lights
Licence plate/luggage compartment lights
Back up lights
Brake Lights
Interior Lights
Glove box light/cassete box ashtry lights/charging socket
Crash Control module
Park, ventilation with HKR
Rear Window defogger
Integrated climate regulation
Radio/Cd player
radio/hifi
Cellular Telephone
Cruise Control tempomat
Anti Theft system
on Board Computer
Component Location Chaart
Component Location Views
Splice Location views
Connector views
