1991 BMW 850i E31 Wiring Diagram

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🏷️ Basic Information Identification Make: BMW Model: 850i Chassis Code: E31 Year: 1991 👋 Introduction Market Position Positioning: The BMW 850i (E31) was positioned as a luxurious and technologically advanced...

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Taper: Car

Distributeur:

UGS: 283588

Mots clés: 1991 850i E31 BMW Car Cars Wiring Diagrams

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Model:

Chassis Code:

Year:

👋 Introduction

Market Position

Positioning:

The BMW 850i (E31) was positioned as a luxurious and technologically advanced grand tourer, representing BMW's flagship coupe of the era.

Competitive Analysis

Competitors:

Competed against other high-end GT cars such as the Mercedes-Benz SEC models, Porsche 928, and Aston Martin Virage.

Key Features

Design:

Striking, aerodynamically efficient 'flame surfacing' design, pop-up headlights, and a low-slung silhouette.

Powertrain:

Technology:

Incorporated advanced features for the period, including electronic throttle control, self-leveling suspension (optional), and a sophisticated CAN bus system for diagnostics.

📋 Manual Details

Coverage Areas

Coverage Type:

Complete Wiring Diagram

Page Count

Estimated Pages:

Varies (typical for E31 wiring diagrams)

Manual Type

Type:

Electrical System Wiring Diagram

Language

Language:

English

Format

Format:

Downloadability:

Yes (Instant Download)

Compatibility

Operating Systems:

All Versions of Windows & Mac

Requirements

Software Required:

Adobe PDF Reader

📖 Manual Coverage

Systems Covered

Electrical System:

Comprehensive coverage of all electrical circuits

Engine Management:

Wiring for Motronic engine management system (ME V1.1)

Ignition System:

Wiring diagrams for ignition control and components

Fuel System:

Electrical schematics for fuel pump, injectors, and sensors

Transmission Control:

Wiring for automatic transmission control unit (e.g., 4HP24)

Lighting System:

Headlights, taillights, interior lighting, fog lights

Instrument Cluster:

Wiring for all gauges, warning lights, and indicators

Climate Control:

Wiring for HVAC blower, A/C compressor, sensors, and controls

Audio System:

Wiring for factory radio, amplifier, and speakers

Power Accessories:

Power windows, door locks, mirrors, sunroof, seats

Safety Systems:

Wiring for ABS, traction control (ASC+T on some models), airbags (if applicable for '91)

Cruise Control:

Wiring for cruise control system components

Anti Theft System:

Wiring for factory alarm system

Diagnostic Ports:

Location and wiring for diagnostic connectors (e.g., OBD-I)

Procedures Included

Troubleshooting:

Facilitates electrical troubleshooting by tracing circuits

Component Replacement:

Guides on locating and connecting electrical components

Wiring Repair:

Aids in repairing damaged wiring harnesses and connections

Technical Depth

Depth:

Detailed schematic representation of every circuit, connector, wire gauge, and component

Component Identification:

Clear labeling of all electrical components and their functions

Connector Diagrams:

Illustrations and pin-outs for various electrical connectors

Fuse Relay Locations:

Identification of fuse boxes, relay locations, and circuit protection

📊 Manual Specifications

File Format

Format:

Searchability:

Likely text-searchable within the PDF document

Print Quality

Printability:

All pages are printable

Binding Type

Binding:

Digital (No physical binding)

Paper Type

Paper Type:

N/A (Digital)

⚙️ Engine Specifications

Primary Engine

Engine Code:

M70 B50

Configuration:

60-degree V12

Displacement:

4988 cc (5.0 Liters)

Bore X Stroke:

84.0 mm x 75.0 mm

Compression Ratio:

8.8:1

Performance

Horsepower:

295 hp @ 5200 rpm

Torque:

332 lb-ft (450 Nm) @ 4100 rpm

Fuel System

Fuel Delivery:

Bosch Motronic M1.2 (later M1.3) fuel injection with two injectors per cylinder

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Engine Management

Motronic M1.2 / M1.3, featuring electronic throttle control (ETC)

Cooling System

Coolant Capacity:

Approx. 13.5 Liters (may vary slightly)

Coolant Type:

BMW Blue Coolant (G48) or equivalent

🔧 Transmission

Standard

Transmission Type:

4-speed automatic (ZF 4HP24)

Optional

Transmission Type:

6-speed manual (S6S-310Z) - available in limited markets

Features

Automatic Features:

Sport and Economy modes (on some versions), electronic control

Fluid Specifications

Automatic Transmission Fluid:

Dexron III or equivalent (check specific BMW recommendation)

Fluid Capacity

Automatic Transmission Capacity:

Approx. 8.0 Liters (dry fill)

📐 Dimensions

Exterior

Length:

4780 mm (188.2 in)

Width:

1855 mm (73.0 in)

Height:

1370 mm (53.9 in)

Wheelbase:

2634 mm (103.7 in)

Front Track:

1550 mm (61.0 in)

Rear Track:

1528 mm (60.2 in)

Weights

Curb Weight:

Approx. 1850 kg (4079 lbs) for automatic transmission

Gross Weight Rating:

Approx. 2300 kg (5070 lbs)

Weight Distribution:

Close to 50/50 front/rear

Cargo

Trunk Capacity:

Approx. 340 Liters (12.0 cu ft)

🛡️ Safety Features

Ratings

Crash Test Ratings:

No standardized crash test ratings (NHTSA/IIHS) available for this era of European vehicles.

Active Features

Standard Anti-lock Braking System (ABS)

Traction Control:

Automatic Stability Control (ASC) or ASC+T (Traction Control) optional/standard depending on market and build date.

Passive Features

Airbags:

Driver's side airbag standard, passenger airbag optional/later availability.

Seatbelts:

Front and rear seatbelts

Body Structure:

Reinforced safety cell, crumple zones.

💡 Technology Features

Infotainment

Audio System:

Factory BMW E32/E34 derived radio system, often with optional amplifier and CD changer preparation. Sound quality can be dated.

Display:

Basic LCD display for radio and climate control information.

Driver Assistance

Cruise Control:

Electronic cruise control system.

Automatic Headlights:

Pop-up headlight system controlled manually or by light sensor on some later models.

Connectivity

Original Connectivity:

Limited to basic cellular phone preparation kits in some markets. No modern connectivity features.

Diagnostics

Diagnostic Interface:

OBD-I (On-Board Diagnostics first generation) with specific BMW proprietary connectors for diagnostic tools.

Diagnostic System:

BMW's proprietary diagnostic system, accessible via specific ports, requiring specialized tools for comprehensive fault code reading and analysis.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 7,500-10,000 miles or annually, whichever comes first (consult owner's manual or service history).

Coolant Flush:

Every 2-3 years or as recommended by BMW.

Transmission Fluid Change:

Every 30,000-60,000 miles for automatic, though often considered 'lifetime' by older BMW standards, manual inspection recommended.

Fluid Specifications

Engine Oil Viscosity:

SAE 15W-50 or 10W-40 (synthetic recommended, consult owner's manual for exact BMW LL-xx specification).

Engine Oil Capacity:

Approx. 7.5 Liters (with filter)

Brake Fluid:

DOT 4 (low viscosity recommended for ABS systems)

Known Issues

Cooling System:

Plastic coolant expansion tanks can become brittle and crack. Water pump seals and thermostat housing can leak.

Electrical System:

Wire harness degradation, particularly in the engine bay (wire coating brittle). ABS wheel speed sensor failures. Door handle microswitches and central locking issues.

Engine M70:

Idles sensors (ISCV) can fail. VANOS seals (if applicable to early models) can degrade. Coil pack failures. Spark plug access is difficult (12 plugs).

Transmission:

Automatic transmission torque converter lock-up issues. Clutch wear on manual versions.

Suspension:

Hydraulic self-leveling suspension (if equipped) can develop leaks or pump issues. Ball joints and tie rod ends wear.

Bodywork:

Corrosion can affect wheel arches, sills, and subframes. Headliner sagging. Pop-up headlight mechanism motors can fail.

Parts Availability

Parts Status:

Many specialized parts can be scarce and expensive, requiring dedicated sourcing.

📚 Vehicle History

Brand Heritage

Heritage:

BMW has a long-standing reputation for building driver-focused luxury vehicles with advanced engineering and performance.

Model Evolution

E31 Introduction:

The E31 8 Series was introduced in 1989 as a successor to the E24 6 Series, aiming to compete in the luxury grand tourer segment.

E31 Development:

Developed over a period of seven years, featuring advanced aerodynamics and engineering, including the first V12 engine in a BMW production car.

E31 Engine Options:

Initially launched with the 5.0L V12 (850i), later joined by a 4.0L V8 (840i) and an uprated 5.6L V12 (850CSi).

Production

Production Years:

1989-1999

Manufacturing Location:

Dingolfing, Germany

Total Production E31:

Approximately 30,600 units across all variants.

1991 Production:

Significant production year for the initial V12 models.

🏆 Awards & Recognition

Recognitions

Automotive Design:

Frequently cited for its groundbreaking and timeless aerodynamic design, influencing automotive styling for years to come.

Engineering Excellence:

The V12 engine was celebrated for its smoothness, power delivery, and technological sophistication, earning it accolades in the automotive press.