This comprehensive electronic troubleshooting manual is specifically designed for BMW E32 7 Series models, including the 735i, 735iL, and 750iL, covering the years 1989 and 1990. It is a valuable resource for technicians and mechanics, providing in-depth information on diagnosing and resolving a wide range of electrical and electronic issues. The manual offers detailed wiring diagrams, component location charts, and step-by-step troubleshooting procedures for various systems, including the engine control unit (ECU), ABS, air conditioning, audio system, and more. This manual is an essential tool for anyone working on these BMW models, enabling them to efficiently identify and address electrical problems with confidence.

The BMW E32, launched in 1986 and produced until 1994, represented a significant evolution for the 7 Series, shifting the luxury sedan towards a more aerodynamic and modern design. The E32 735i, 735iL, and 750iL models, specifically those manufactured in 1989 and 1990, were prime examples of this transformation. Sporting a sharp, angular exterior with a low-slung profile, the E32 boasted sleek lines and a distinctive grille that became synonymous with the brand. The interior further emphasized luxury with its plush leather seats, wood trim, and advanced features like an optional digital instrument cluster. Underneath the hood, the 735i and 735iL models housed a powerful 3.4-liter inline-six engine, while the 750iL showcased a potent 5.0-liter V12, offering exceptional performance and driving experience. These models were also equipped with innovative technology for the time, including Anti-lock Braking System (ABS), Automatic Stability Control (ASC), and an optional electronically controlled suspension. The 1989 and 1990 E32 7 Series models, as with any complex mechanical and electronic system, occasionally experience issues that require troubleshooting. This is where a dedicated troubleshooting manual becomes indispensable. A comprehensive manual provides detailed diagrams, flowcharts, and step-by-step instructions to guide technicians and even knowledgeable owners through diagnosing and resolving electronic problems. It covers a wide range of potential issues, from faulty sensors and actuator failures to wiring problems and software malfunctions. Armed with such a manual, individuals can accurately identify symptoms, pinpoint the source of the issue, and effectively restore the vehicle's functionality. For the discerning BMW enthusiast or professional mechanic, this troubleshooting manual is a valuable asset for maintaining the E32 7 Series's performance and ensuring a smooth and enjoyable driving experience.