BMW 3 Series · E30 · 1987 Electrical Troubleshooting Manual
Every E30 wiring diagram, traceable.
The factory wiring diagrams, redrawn so you can follow them. Click any wire to light up its whole circuit, click a part to see every pin and where it goes, and search every page for a part or wire by name.
Find the circuit
Search by part or wire name, or browse by system below. Every page is one diagram from the manual.
Click a wire
The whole circuit lights up across splices and connectors, and the rest of the page dims so you can follow it.
Click a part
See every pin, what it does, and the wire colour, size and destination of each connection.
Troubleshooting guides
All guidesE30 No-Crank / No-Start Guide
Click through what the car is doing and be taken to the most likely cause, with the factory wiring pages for every circuit involved.
ReferenceRelay numbers, and how to jump a relay socket
What 30, 85, 86, 87 and 87a mean, the E30's key relays, and how to prove a fuel pump works by jumping its relay socket.