The BMW M3 (E30), produced between 1987 and 1991, stands as a legendary compact executive sports sedan and coupe, born from a need for racing homologation. This iconic model, powered by a purpose-built, high-revving 2.3-liter S14 inline-4 engine, is renowned for its exceptional handling dynamics, precise steering, and a driver-focused experience enhanced by distinctive aerodynamic revisions. Its motorsport pedigree is evident in its design and performance, making it a highly sought-after vehicle that competed against esteemed marques like Porsche and Mercedes-Benz.

This comprehensive Wiring Diagram Manual provides detailed electrical schematics and diagnostic information for the BMW M3 (E30) models from 1987-1991. It covers a wide array of systems, including engine management, ABS, climate control, lighting, and instrumentation, offering clear component identification, connector pinouts, and fuse/relay locations. The manual is designed to assist owners, mechanics, and technicians in accurately troubleshooting and repairing the vehicle's complex electrical systems, ensuring optimal performance and longevity.