This comprehensive Electrical Troubleshooting Manual (ETM) is designed for the BMW 5 Series (E34) 525i and 535i models produced between 1988 and 1989. It provides detailed information and instructions for servicing, maintaining, and troubleshooting the electrical systems of these vehicles. This manual is the same one used by professional service shops, offering a complete and accurate resource for all models, engines, trims, and transmissions.

The ETM is organized into sections, each covering a specific electrical component or system. In addition to standard service procedures, each section includes detailed instructions for disassembling, inspecting, and reassembling each component. A clear table of contents at the beginning of each section helps you easily locate the information you need.

This manual provides comprehensive coverage of the electrical systems, including:

* **Gearbox & Clutch**
* **Electric Starter**
* **Crankshaft/Transmission/Balancer**
* **Wheels & Tyres**
* **Electrical System**
* **Braking System**
* **Suspension**
* **Periodic checks & Adjustments**
* **Wiring Diagrams**
* **Engine Lubrication and Cooling**
* **Ignition System**
* **Transmission System**
* **Troubleshooting**
* **Lubrication System**
* **Rear Wheel System**
* **Cylinder Head/Valves**
* **Cooling system**
* **Engine Removal and Installation**
* **General Information**
* **Battery/Charging System**
* **Chassis**
* **Technical Information & Specifications**
* **Lights/Meters/Switches**
* **Frame/Body Panels/Exhaust System**
* **Maintenance**
* **Alternator/Starter Clutch**
* **Fenders and Exhaust Pipe**
* **Front Wheel and Steering System**
* **Specifications**
* **Engine Fuel System**
* **Crankcase/Piston/Cylinder**
* **Engine Combustion System**
* **Fuel injection system**
* **Body & Fixtures**

This manual is ideal for garage owners, service repairers, MOT testers, parts advisors, collectors, and enthusiasts. It contains valuable technical solutions, including fault code diagnostics, specific torque settings, resetting service light indicators, fluid levels and grades, service intervals, general vehicle maintenance information, and much more.

The BMW 5 Series (E34) is a mid-size executive car that was produced by BMW from 1988 to 1996. It was the fourth generation of the 5 Series and marked a significant departure from its predecessor, the E28. The E34 was larger and more luxurious, offering a more comfortable and refined driving experience. It was also the first 5 Series to feature a four-wheel independent suspension system, which improved handling and ride quality. The 525i and 535i models, the focus of this Electrical Troubleshooting Manual (ETM), were powered by a 2.5-liter inline-six engine and a 3.5-liter inline-six engine respectively. Both engines were known for their smooth power delivery and refinement, making the E34 a popular choice among drivers seeking both performance and luxury.

This Electrical Troubleshooting Manual (ETM) is an essential tool for anyone who works on the electrical systems of the 1988-1989 BMW 5 Series (E34) 525i and 535i. It provides detailed information on the electrical components, wiring diagrams, troubleshooting procedures, and repair instructions. The manual covers a wide range of electrical systems, including the engine control unit (ECU), ignition system, fuel injection system, lighting, and climate control. The ETM is written in a clear and concise style, making it easy to understand and use. This manual is a valuable resource for automotive mechanics, technicians, and anyone who wants to learn about the electrical systems of the BMW 5 Series (E34). It can help to diagnose and repair electrical problems quickly and efficiently.