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!
My “new” 1973 2002tii needs a new battery. Any suggestions for a good, maintenance free battery? I remember the “Varta” brand as the OEM battery when I had my original 2002 as well as a few later BMW’s but I don’t think that Varta is sold in the US anymore. Anyone have a battery that could suggest?
Jim Gerock writes: When I bought my 73tii, the previous owner had installed an Interstate brand MT-42 60 Month battery. It’s a tight fit, but it works. Keith Kreeger writes: The original VARTA type battery is still available from any BMW dealer. The BMW part number is 61 21 1 362 314, which is a 55 amp hour battery according to the most recent parts CD we have. Last update: 2007-06-10 19:27 Author: Jim Gerock, Keith Kreeger
After removing my alternator for bushing replacement, I took it to (2) places before I was able to have it tested. The newest computerized charging system tester stations do not list this car in their database. Some places don’t have the correct connector. I first took my original 73 unit to a local Pep Boys service center. They had a fancy new machine that didn’t have the older BMW’s listed. The second place was an Advanced Auto Parts store.
They had a slightly older tester that was used on my alternator – but they claimed the output was too low under load. I neglected to ask “how bad is it”. They also tried to sell me the standard top mount non-tii remanufactured unit!. I finally ended up in a very old Auto/Marine Electric shop very close to my workplace. They tested the alternator and said it worked fine but the bearings were going bad. I decided to order a Bosch AL-40X (still on backorder). After waiting 4 weeks! – my new alternator arrived. It even came with a new black pulley/fan and resistor! Notes regarding the red urethane bushings sold by several companies: They are too thick and the stock washer will not fit under the circlip. Trim the leading edges before installing them. Last update: 2009-06-24 19:01 Author: Jim Gerock