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      05-28-2022, 09:56 PM   #19
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Drives: 2011 328i Xdrive
Join Date: Apr 2022
Location: us

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Originally Posted by Mike K View Post
Any tips on how not to deep six the FRM when disconnecting the battery for other maintenance?
Yeah I've thought about it. I disconnected the battery many-many times without issues. Negative first, then the positive terminal. The most important part in my experience, is the health level of battery. Always keep a healthy battery that is replaced promptly when you notice sluggish starts and/or welcome lights go off too soon.
My guess is that this happened to my FRM because the battery deeply discharged, maybe below 11.5 volts while I was working on the car with the trunk open a long time, car unlocked. Then I tried to recharge the battery, but at this point I think the damage was already done. This discharged battery was already 5 years old (basically absolute age limit for BMW).
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Mike K152.50