This comprehensive repair manual provides detailed instructions for all aspects of your 1989-1990 BMW 735i-Il 750Il (e32) vehicle. The manual is designed to be user-friendly, even for those with limited mechanical experience. It includes step-by-step explanations, illustrations, diagrams, and technical specifications, allowing you to understand and perform various repairs and maintenance tasks.

The manual covers a wide range of systems, including:

* **Engine Control System:** Diagnose and repair issues related to fuel injection, ignition, and emissions controls.
* **Charging System:** Troubleshoot and repair problems with the battery, alternator, and charging circuits.
* **Start System:** Understand the workings of the starter motor and related components.
* **Electronic Transmission Control:** Diagnose and adjust the automatic transmission system.
* **Supplement Restraint System:** Understand the operation and maintenance of the airbag system.
* **Slip Control ABS:** Learn about the anti-lock braking system and how to troubleshoot any issues.
* **Power Mirrors, Central Locking Module, Power Windows, Power Seats, Heated Seats, Power Sunroof, Horn, Wiperwasher Module, Headlight Washer, Windshield Washer Jet Heaters:** Covering all aspects of these electrical comfort and safety features.
* **Instrument Cluster, Multi Function Clock, Light Switch Details, Headlights/Fog Lights, Turnhazard Lights, Park/Tail/Underhood Lights, License Plate/Luggage Compartment Lights, Back up Lights, Brake Lights, Interior Lights, Glove Box Light/Cassete Box Ashtry Lights/Charging Socket:** Providing detailed information on all lighting systems.
* **Crash Control Module, Park, Ventilation with HKR, Rear Window Defogger, Integrated Climate Regulation:** Helping you understand the vehicle's climate control system.
* **Radio/CD Player, Radio/HiFi, Cellular Telephone, Cruise Control Tempomat, Anti Theft System, On Board Computer:** Providing detailed instructions on these features.
* **Component Location Chart, Component Location Views, Splice Location Views, Connector Views:** For easy identification and access to all electrical components.

With this manual, you can confidently tackle various repair and maintenance tasks, saving you time and money compared to relying on professional services.

The BMW 735i and 750i, both designated as the E32 chassis code, represent the third generation of the BMW 7 Series luxury sedan, produced between 1986 and 1994. These models marked a significant departure from their predecessors, featuring a more aerodynamic and angular design, a more refined interior, and an advanced range of engines and technology. The 735i was powered by a 3.4-liter inline-six engine, while the 750i featured a powerful 5.0-liter V12 engine, both paired with a smooth-shifting 5-speed automatic transmission. Notably, the E32 generation introduced several groundbreaking features for the time, including a fully digital instrument cluster, a first in a production car, and an advanced onboard computer system offering a range of functions. These features, combined with its distinctive design and luxurious interior, cemented the E32's reputation as one of the most technologically advanced and prestigious automobiles of its era.

While renowned for its luxury and performance, the E32 7 Series was not immune to electrical issues, particularly as these vehicles age. Electrical troubleshooting can be a complex endeavor, often requiring specialized diagnostic equipment and a deep knowledge of the vehicle's intricate wiring and systems. Common areas of concern include faulty sensors, relays, and switches, often manifesting in issues like starting problems, dashboard warning lights, malfunctioning power windows, and intermittent electrical failures. To successfully address these issues, a systematic approach is essential, starting with a thorough inspection of known problem areas and utilizing diagnostic tools to pinpoint the root cause. Understanding the vehicle's electrical system architecture, pinpointing electrical schematics, and conducting thorough circuit testing are crucial steps in resolving these electrical headaches.