’02 Factory Diagnostic Plug – What’s that for?

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BMW 2002 Series – Factory Diagnostic Plug

Have you ever seen this plug on your fender near the fuse box, and wondered what it did?  Well BMW had the best intentions to maintain the car with it.

As shown in the photos from the original 1974 era sales brochure, BMW had their own diagnostic system to read the car’s systems and conduct service.  Fortunately in today’s world you can do this with an inexpensive hand held automotive multi-tester unit.

With that in mind, here’s the diagram you want. You can use this for your own needs in diagnosing and maintaining the car.  If you’re handy with a volt meter and electronics, you have a new project!