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WANTED Base Module / General Module (BM/GM)
- Thread starter Rfreeman
- Start date
What year / model car are you working on? This forum is for the W124 chassis only, and there is no gateway control module on the W124.
1991 500 E my battery keeps going dead the shop said when they unplugged the gateway module Under the hood it stoped ./ dropped?
Your shop is likely referring to the Base Module / General Module (BM/GM) and incorrectly called it "Gateway" module. Thread title updated.
It's unlikely the BM/GM has failed and is causing the power drain which is killing your battery. The BM/GM is the power supply for all the other computer modules, it could be a different module that has a problem, and pulling the BM/GM is simply removing power from the other module. You can try a replacement BM/GM but don't get your hopes up that this will fix the problem.
Also, a corroded 38-pin connector can cause this exact same problem, and removing the BM/GM will appear to "fix" the problem, but a new one won't help. Details & diagnostic instructions are here.
Additional diagnosis is needed. Sounds like your local shop is not intimately familiar with these cars. Depends how many parts / much money you want to throw at it, vs diagnosing the root cause & fixing that...
