🏷️ Basic Information

Make:

BMW

Model:

7 Series

Model Variant:

735iL, 750iL

Chassis Code:

E32

Production Years Covered:

1989-1990

Manual Title:

BMW 735iL, 750iL (E32) 1989-1990 Electrical Troubleshooting Manual

Manual Type Code:

ETM

👋 Introduction

Segment:

Full-size luxury sedan.

Prestige:

Represents BMW's flagship luxury offering, emphasizing performance, comfort, and advanced technology for its era.

Competitors:

Mercedes-Benz S-Class (W126/W140), Jaguar XJ, Audi V8 Quattro.

Luxury Appointments:

Spacious interior, high-quality materials, advanced comfort features (e.g., heated/power seats, climate control).

Performance Heritage:

BMW's renowned driving dynamics applied to a large luxury platform.

Electrical Complexity:

One of the most electronically sophisticated vehicles of its time, necessitating detailed electrical documentation.

📋 Manual Details

Primary Focus:

Electrical Systems and Troubleshooting

Vehicle Range:

Front to back of the car, covering all electrical components.

Estimated Pages:

Extensive (specific count not provided, but described as comprehensive for all repairs).

Type:

Electrical Troubleshooting Manual (ETM) / Repair Manual

Language:

English (implied by product description context and standard for such manuals).

Format:

Likely digital (PDF) for widespread distribution, though historically printed.

📖 Manual Coverage

Power Distribution:

Detailed charts and explanations of power flow.

Fuses:

Fuse charts, fuse details, and power distribution related to fuses.

Grounding:

Ground distribution diagrams and explanations.

Data Link Connector:

Information regarding the vehicle's diagnostic data link.

Engine Management:

Engine Control System diagnostics and troubleshooting.

Charging System:

Complete coverage of the charging system components and operation.

Starting System:

Troubleshooting and repair of the starting system.

Transmission Control:

Electronic transmission control systems.

Supplemental Restraint System:

Airbag system (SRS) details and troubleshooting.

Slip Control:

Anti-lock Braking System (ABS) operation and diagnostics.

Convenience Features Power:

Power mirrors, central locking, power windows, power seats, heated seats.

Convenience Features Other:

Power sunroof, horn, wiper/washer system, headlight washers, windshield washer jet heaters.

Instrumentation:

Instrument cluster, multi-function clock.

Lighting:

Light switch details, headlights, fog lights, turn/hazard lights, park/tail/underhood lights, license plate/luggage compartment lights, back-up lights, brake lights, interior lights, glove box/cassette box/ashtray lights, charging socket.

Climate Control:

Integrated climate regulation, Park/Ventilation with HKR (Headlight/Klimaregelung), Rear window defogger.

Audio Telematics:

Radio/CD player, Radio/Hi-Fi systems, Cellular Telephone.

Driver Aids:

Cruise Control (Tempomat), On-Board Computer.

Security:

Anti-Theft System.

Crash Control:

Crash Control module.

Troubleshooting:

Step-by-step explanations for diagnosing and resolving electrical faults.

Diagnosis:

Technical information needed to get cars running in 100% condition.

Component Location:

Component Location Charts, Component Location Views, Splice Location Views, Connector Views.

Diagrams:

Includes electrical diagrams and wiring schematics.

Depth:

Depth illustrations and technical specifications for detailed understanding.

Accessibility:

Understandable even for those with basic mechanical knowledge, ensuring safety and ease of servicing.

📊 Manual Specifications

File Type:

Likely PDF, facilitating searchability and printing.

Quality:

High, with illustrations and diagrams for clarity.

Binding:

N/A (if digital). If printed, typically a professional perfect binding or spiral binding for workshop use.

Paper:

N/A (if digital). If printed, typically durable, coated paper for workshop environments.

⚙️ Engine Specifications

Engine Type:

Naturally Aspirated V8

Engine Code:

M60B35

Displacement:

3.5 liters (3495 cc)

Bore X Stroke:

84.0 mm x 77.6 mm

Compression Ratio:

8.8:1

Horsepower:

Approx. 208 hp @ 5700 rpm

Torque:

Approx. 225 lb-ft @ 4000 rpm

Engine Type:

Naturally Aspirated V12

Engine Code:

M70B50

Displacement:

5.0 liters (4988 cc)

Bore X Stroke:

84.0 mm x 75.0 mm

Compression Ratio:

8.8:1

Horsepower:

Approx. 296 hp @ 5200 rpm

Torque:

Approx. 332 lb-ft @ 3900 rpm

Fuel Delivery:

Bosch Motronic electronic fuel injection.

Acceleration 0 60 Mph 735Il:

Approx. 7.8 seconds

Acceleration 0 60 Mph 750Il:

Approx. 6.5 seconds

🔧 Transmission

Type:

4-speed automatic

Transmission Code:

ZF 4HP22

Type:

4-speed automatic

Transmission Code:

ZF 4HP24

Shift Modes:

Includes Sport and Economy (or similar) modes depending on the specific transmission and options.

Fluid Type:

BMW ATF Dexron II or equivalent (confirm with specific vehicle VIN for exact specification).

📐 Dimensions

Length:

Approx. 198.1 inches (5032 mm)

Length:

Approx. 198.1 inches (5032 mm)

Wheelbase:

Approx. 117.4 inches (2982 mm)

Width:

Approx. 70.5 inches (1791 mm)

Height:

Approx. 55.8 inches (1417 mm)

Curb Weight 735Il:

Approx. 3,740 lbs (1700 kg)

Curb Weight 750Il:

Approx. 4,160 lbs (1890 kg)

Standard Tire Size 735Il:

215/65R15

Standard Tire Size 750Il:

225/60R15

Wheel Bolt Pattern:

5x120

🛡️ Safety Features

NHTSA Frontal Impact:

Not extensively rated by modern standards, but built to high safety standards for its era.

ABS:

Standard Anti-lock Braking System (ABS).

Airbags:

Driver's airbag (standard in later production and likely 1989-90 models), Passenger airbag optional or standard depending on market and build date.

Seatbelts:

Three-point seatbelts with pretensioners.

Body Structure:

Reinforced safety cage and crumple zones.

💡 Technology Features

Audio Systems:

Original BMW Bavaria C, Business CD, or high-end Hi-Fi systems with speaker upgrades available.

Cruise Control:

Electronic cruise control (Tempomat) for highway driving comfort.

Onboard Computer:

On-Board Computer (OBC) providing trip data, fuel consumption, and system checks.

Telephone:

Optional integrated cellular telephone system (early mobile phone technology).

Climate Control:

Dual-zone automatic climate control and integrated HVAC system.

🔧 Maintenance

Oil Change:

Typically every 7,500-10,000 miles or 12-18 months, depending on driving conditions (refer to specific owner's manual or diagnostic service indicators).

Coolant Change:

Every 2 years or as recommended by BMW for the specific coolant type used.

Spark Plugs:

Approximately every 30,000 miles for standard plugs, or longer for platinum/iridium plugs (refer to manual for specific recommendations).

Engine Oil Capacity 735Il:

Approx. 6.5 liters (with filter).

Engine Oil Capacity 750Il:

Approx. 7.5 liters (with filter).

Engine Oil Viscosity:

Likely 5W-30 or 10W-40 synthetic or semi-synthetic (verify with manual).

Coolant:

BMW Blue Coolant (G48) or equivalent ethylene glycol-based coolant with corrosion inhibitors.

Brake Fluid:

DOT 4 or DOT 5.1 (verify specific type needed).

Electrical Reliability:

Given the age and complexity, common issues can include wiring harness degradation, sensor failures (e.g., ABS sensors, O2 sensors), control module failures, and battery drain issues. This manual is crucial for addressing these.

Cooling System:

Potential for coolant leaks from hoses, water pump, or radiator, especially given age.

Idle Control:

Issues with Idle Control Valve (ICV) or vacuum leaks can affect idle quality.

V12 Specific:

The M70 V12 engine, while smooth, can be complex; individual throttle bodies and ignition systems require careful maintenance.

📚 Vehicle History

Bmw Legacy:

BMW's long-standing reputation for engineering, performance, and luxury vehicles.

E32 Introduction:

The E32 generation of the 7 Series succeeded the E23 and was produced from 1986 to 1994, with the 1989-1990 models representing early production of this sophisticated platform.

Technical Advancements:

Introduced significant technological advancements for BMW, including multi-link front suspension, CAN bus integration (in later models), and advanced engine management.

Manufacturing Location:

Dingolfing, Germany.

🏆 Awards & Recognition

Industry Acclaim:

Consistently praised by automotive journalists of the era for its refinement, technology, and driving dynamics, often winning comparisons against its luxury peers.

Engineering Excellence:

Recognized for its innovative engineering, particularly the V12 engine in the 750iL, which was a benchmark for automotive smoothness and power.