🏷️ Basic Information

Make:

BMW

Model:

7 Series

Model Designation:

E32

Specific Models Covered:

735iL, 750iL

Model Years Covered:

1990-1991

Chassis Code:

E32

Engine Codes Likely Covered:

M30B35 (735iL), M70B50 (750iL)

👋 Introduction

Target Audience:

BMW owners, independent repair shops, automotive technicians specializing in European vehicles.

Value Proposition:

Enables significant cost savings on repairs by empowering DIY diagnostics and repairs, mirroring professional workshop resources.

Usability:

Designed for understanding by individuals with basic mechanical knowledge, featuring clear explanations and illustrations.

Content Type:

Technical information, illustrations, diagrams, and step-by-step procedures.

📋 Manual Details

Overall Coverage:

Comprehensive electrical systems troubleshooting and repair for the specified BMW E32 models.

Specific Systems Coverage:

Power distribution, fuses, ground distribution, engine control, charging, starting, transmission control, supplementary restraint system (SRS), ABS, power mirrors, central locking, power windows, power seats, heated seats, power sunroof, horn, wiper/washer systems, headlight washers, windshield washer jet heaters, instrument cluster, multi-function clock, lighting systems (headlights, fog lights, turn signals, hazard lights, parking/tail/underhood lights, license plate/luggage compartment lights, backup lights, brake lights, interior lights, glove box light, cassette box/ashtray lights, charging socket), crash control module, parking/ventilation (HKR), rear window defogger, climate control, audio systems (radio/CD player, radio/Hi-Fi), cellular telephone, cruise control, anti-theft system, onboard computer, component locations, splice locations, connector views.

Estimated Page Count:

Likely 100-300 pages (typical for dedicated electrical troubleshooting manuals).

Type:

Electrical Troubleshooting Manual / Repair Manual

Language:

English (inferred from description, likely originally German for a BMW manual).

Format:

Digital (PDF) or Printed Copy (as suggested by 'what will be send to you').

📖 Manual Coverage

Electrical Systems:

All major electrical and electronic systems as detailed in 'specific_systems_coverage'.

Troubleshooting Methodology:

Step-by-step troubleshooting guides, diagnostic procedures, wiring diagram interpretation.

Repair Instructions:

Detailed repair steps for electrical components and circuits.

Maintenance Procedures:

Electrical system checks and basic maintenance tasks.

Diagnostic Capability:

Advanced diagnostic information, including fault code interpretation (if applicable to the era's systems) and signal tracing.

Component Level Detail:

Detailed explanations of component functions, operation, and testing.

Wiring Diagrams:

Inclusion of comprehensive wiring diagrams, power distribution charts, and component location views.

📊 Manual Specifications

Digital Quality:

Searchable text (ideal for PDF), high-resolution clear diagrams and illustrations.

Printed Materials:

High-quality paper, durable binding (likely perfect binding or spiral for ease of use in a workshop).

Physical Format:

Perfect bound or Spiral bound (for shop use).

Paper Quality:

Durable, likely semi-gloss or matte finish paper suitable for workshop environments.

⚙️ Engine Specifications

735Il Engine:

3.5L Inline-6 SOHC (M30B35)

750Il Engine:

5.0L V12 SOHC (M70B50)

735Il Horsepower:

~208 hp @ 5700 rpm

735Il Torque:

~214 lb-ft @ 4000 rpm

750Il Horsepower:

~295 hp @ 5200 rpm

750Il Torque:

~332 lb-ft @ 3900 rpm

Fuel Delivery:

Bosch Motronic electronic fuel injection (EFI) for both models.

🔧 Transmission

735Il Transmission:

4-speed automatic (e.g., ZF 4HP-22)

750Il Transmission:

4-speed automatic (e.g., ZF 4HP-24)

735Il Transmission Optional:

5-speed manual (less common in North America)

Electronic Control:

Electronic transmission control (ETC) present on automatic transmissions, managed by a dedicated control unit.

📐 Dimensions

Wheelbase 735Il:

117.4 inches (3.0 m)

Wheelbase 750Il:

120.1 inches (3.05 m)

Curb Weight 735Il:

approx. 3,900 lbs (1,769 kg)

Curb Weight 750Il:

approx. 4,500 lbs (2,041 kg)

🛡️ Safety Features

ABS:

Anti-lock Braking System (ABS) standard on both models.

Airbags:

Driver's airbag standard; passenger airbag may have been optional or introduced later in the E32 run.

Srs:

Supplementary Restraint System (SRS) management for airbags.

💡 Technology Features

Audio Systems:

BMW Bavaria or BMW Professional radio/cassette systems, optional CD player, optional Hi-Fi sound systems.

Cruise Control:

Cruise Control ('Tempomat') is a standard feature.

Climate Control:

Integrated climate regulation, often dual-zone or multi-zone, with automatic temperature control.

Telephone:

Optional integrated cellular telephone system.

Onboard Computer:

On-Board Computer (OBC) providing vehicle status, trip data, and diagnostic information.

🔧 Maintenance

Oil Change Interval:

Typically every 7,500-10,000 miles or 12 months (refer to specific owner's manual for exact recommendation).

Engine Oil 735Il:

SAE 15W-40 or 10W-40 API SG or higher (check for specific BMW LL-98 or LL-01 approvals for later models, but for 90-91, SG is typical).

Engine Oil 750Il:

SAE 15W-50 or 10W-40 API SG or higher (V12 may prefer slightly heavier oil due to its complexity).

Transmission Fluid Automatic:

Dexron III or equivalent for ZF 4HP-22/24 transmissions.

Electrical Common Problems:

Corrosion in wiring harnesses (especially at connectors), failing ABS sensors and modules, EML (Electronic Throttle Control) issues (if applicable, though less common on these specific models compared to later ones), headlight wiper motor failures, OBC (On-Board Computer) pixel degradation, power seat module failures, door lock actuator issues.

Engine Common Problems:

Head gasket leaks, oil pan gasket leaks, cooling system component degradation (hoses, thermostat), timing chain wear (M70 V12).

📚 Vehicle History

Bmw Philosophy:

BMW's reputation for performance, luxury, and engineering excellence.

E32 Introduction:

The E32 generation replaced the E23 7 Series and was produced from 1986 to 1994. The 1990-1991 models represent early to mid-production variants.

Manufacturing Location:

Dingolfing, Germany.

🏆 Awards & Recognition

Model Recognition:

The E32 7 Series was critically acclaimed for its advanced technology, luxury, and driving dynamics, often being considered a benchmark for executive sedans of its era.