🏷️ Basic Information

Make:

BMW

Model:

7 Series

Model Variant:

E32 735i, 735iL, 750iL

Year:

1989-1990

Chassis Code:

E32

Engine Codes:

M30B35 (735i/iL), M70B50 (750iL)

👋 Introduction

E32 Positioning:

The E32 7 Series represented BMW's flagship luxury sedan, competing with other high-end marques by offering advanced technology, superior driving dynamics, and a focus on driver engagement.

Competitors:

Mercedes-Benz W126 S-Class, Jaguar XJ, Lexus LS 400 (later models).

E32 Luxury:

Emphasis on occupant comfort, sophisticated interior design, and a quiet ride, particularly in the long-wheelbase 'iL' variants.

E32 Performance:

Powerful inline-six (735i/iL) and V12 (750iL) engines, refined suspension, and stable handling characteristics that defined BMW's 'Ultimate Driving Machine' ethos.

Usefulness:

Essential for diagnosing and repairing the complex electronic systems that were a hallmark of this era of BMW luxury vehicles. Addresses common electronic gremlins and ensures proper system function.

📋 Manual Details

Primary Coverage:

Electronic Systems Troubleshooting

Secondary Coverage:

Engine management, ignition, fuel injection, ABS, climate control, body electronics

Estimated Pages:

Extensive (Exact count not provided, typical for troubleshooting manuals covering multiple systems)

Type:

Electronic Troubleshooting Manual / Service Manual Supplement

Language:

English

Format:

Digital (likely PDF, based on product description)

📖 Manual Coverage

Engine Management:

DME (Digital Motor Electronics) systems for 735i/iL and DME/DWS for 750iL, including sensors, actuators, and control modules.

Ignition System:

Ignition coil operation, control signals, troubleshooting of ignition faults.

Fuel System:

Fuel injection system (Bosch Motronic), injector operation, fuel pump control, fuel pressure regulation troubleshooting.

ABS System:

ABS (Anti-lock Braking System) control module, wheel speed sensors, hydraulic unit, troubleshooting of ABS warning lights and malfunctions.

Climate Control:

Automatic climate control (IHKA), HVAC control modules, blower motor control, flap actuator diagnostics, sensor troubleshooting.

Body Electronics:

Central locking, power windows, sunroof, mirrors, instrument cluster warnings, interior lighting, OBC (On-Board Computer) diagnostics.

Lighting Systems:

Headlight control, fog lights, brake lights, turn signals, and associated control modules/relays.

Diagnostic Tools:

Information on using BMW's diagnostic connectors (e.g., 20-pin under hood) and interpreting diagnostic codes.

Troubleshooting Methodology:

Systematic approach to diagnosing electrical faults, including symptom analysis and diagnostic tree usage.

Wiring Diagrams:

Detailed electrical wiring schematics for all covered systems, crucial for tracing circuits and identifying faults.

Component Testing:

Procedures for testing individual electronic components, sensors, and actuators using multimeters and oscilloscopes.

Diagnostic Code Interpretation:

Explanation of BMW diagnostic trouble codes (DTCs) and their associated fault descriptions.

Connector Pinouts:

Detailed pin assignments for various electronic control modules and connectors.

Fuse Relay Locations:

Identification and function of fuses and relays related to the electrical systems.

Depth:

Advanced Diagnostics and Troubleshooting

Focus:

Diagnosing faults that may not be apparent through basic visual inspection or simple checks.

Target Audience:

Professional mechanics, advanced DIY enthusiasts, automotive technicians.

📊 Manual Specifications

Digital Format:

PDF (Portable Document Format)

Searchability:

Likely text-searchable, allowing quick access to specific topics.

Reproducibility:

Designed for clear viewing of diagrams and text, printable.

Physical Binding:

N/A (Digital Product)

Physical Paper:

N/A (Digital Product)

⚙️ Engine Specifications

Engine Type:

Inline 6-cylinder, SOHC

Displacement:

3.430 cc (3.4 Liters)

Bore X Stroke:

92 mm x 86 mm

Compression Ratio:

8.5:1

Horsepower:

208 hp @ 5,700 rpm

Torque:

290 Nm (214 lb-ft) @ 4,000 rpm

Fuel System:

Bosch Motronic ML-S (Electronic Fuel Injection and Ignition)

Engine Type:

V12, SOHC

Displacement:

4.988 cc (5.0 Liters)

Bore X Stroke:

84 mm x 75 mm

Compression Ratio:

8.8:1

Horsepower:

296 hp @ 5,200 rpm

Torque:

470 Nm (347 lb-ft) @ 3,900 rpm

Fuel System:

Bosch Motronic M3.3 (Dual ECUs for V12 engine)

🔧 Transmission

Type:

4-speed Automatic (ZF 4HP22)

Type:

5-speed Manual (Getrag 265)

Type:

4-speed Automatic (ZF 4HP24)

E32 Auto Modes:

Comfort and Sport modes for adaptive shift points.

Automatic Transmission Fluid:

BMW ATF Dexron II (e.g., Pentosin ATF 1 or equivalent specification)

📐 Dimensions

Length:

4,910 mm (193.3 in)

Length:

5,024 mm (197.8 in)

Length:

5,024 mm (197.8 in)

Wheelbase Short Wheelbase:

2,830 mm (111.4 in)

Wheelbase Long Wheelbase:

2,945 mm (116.0 in)

Curb Weight 735I:

approx. 1,650 kg (3,638 lbs)

Curb Weight 750Il:

approx. 1,910 kg (4,211 lbs)

🛡️ Safety Features

NHTSA Rating:

Not officially rated by NHTSA in the modern sense, but designed to high European safety standards.

ABS:

Standard on all models (ASC - Automatic Stability Control optional on some later 735iL/750iL).

Airbags:

Driver's airbag standard from late 1989/early 1990 models onwards. Passenger airbag not typically available for these model years.

Seatbelts:

Front and rear seatbelts with pre-tensioners on front belts.

Body Structure:

Reinforced passenger cell with crumple zones.

💡 Technology Features

Onboard Computer:

BMW On-Board Computer (OBC) providing fuel consumption, range, and diagnostic messages.

Audio System:

Premium Hi-Fi audio systems, often with cassette player and optional CD changer.

Cruise Control:

Standard electronic cruise control.

Traction Control:

ASC (Automatic Stability Control) available on later models, especially 750iL.

Diagnostic Port:

Early OBD-I compliant, with a specific 20-pin diagnostic connector located in the engine bay for accessing fault codes.

🔧 Maintenance

Oil Change Interval:

Every 10,000-15,000 km (6,000-9,000 miles) or annually, whichever comes first, depending on driving conditions.

Spark Plug Replacement:

Approximately 40,000-60,000 km (25,000-37,000 miles) for standard plugs, longer for platinum/iridium.

Transmission Fluid Change:

Recommended every 50,000-80,000 km (30,000-50,000 miles).

Engine Oil Type:

API SG or higher, SAE 5W-30, 5W-40, or 10W-40 depending on ambient temperature. Consult manual for exact specification.

Coolant:

BMW Blue or Green antifreeze coolant mixture (50/50) with distilled water.

Brake Fluid:

DOT 4 (e.g., ATE TYP 200 or equivalent).

Cooling System:

Plastic coolant expansion tanks can become brittle and crack. Water pump failure is also common.

Electrical Gremlins:

Corrosion on connectors, failing O-rings in the SRS system, pixelation on the instrument cluster OBC display, and issues with the central locking vacuum system.

Fuel System 750:

Potential issues with the dual airflow meters and lambda sensors on the V12 engine.

Suspension:

Worn control arm bushings and rear self-leveling suspension issues (on some models) can occur.

📚 Vehicle History

Bmw Legacy:

BMW has a long history of producing premium, performance-oriented luxury sedans, building on the success of models like the E23 7 Series.

E32 Introduction:

Introduced in 1986 as a successor to the E23, the E32 represented a significant leap forward in automotive design and technology for BMW.

E32 Variants:

The range expanded to include the 735i (standard and long wheelbase 'iL') and the prestigious V12-powered 750iL, which was the first mass-produced V12 engine in a European passenger car.

Production Years:

1986-1994 (for E32 chassis)

Manufacturing:

Dingolfing, Germany

🏆 Awards & Recognition

Automotive Journalism:

The E32 7 Series was generally well-received by automotive press for its engineering, performance, and refinement, often cited as a benchmark in the luxury sedan segment of its era.

Design Awards:

Recipient of various design accolades for its aerodynamic and timeless styling, penned by Claus Luthe.

Technical Standard:

Manufactured to rigorous German engineering and quality standards.