Quote:
Originally Posted by nemo
Congratulations! Hopefully it does not return or you may be looking for what shorted to cause the blown fuse. Another extra fuse in the glove box and showing your daughter which it is might be worth the effort.
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Good points. I did explain the failure fully to her, and she has a set of extra fuses in the car. She has done lots of the work with me, so she could do this if it failed again, probably needing me oon the phone with her.
I have assumed that the failure scenario was like this: she rode pretty hard over a curb with the rear passenger wheel. Inside the trunk, above that wheel, is the battery. The battery has an "intelligent battery sensor" on it that helps the car monitor and regulate power flow (lows and highs). I found the sensor unplugged because the car was throwing "BMW specialty codes" as if it were "missing." My daughter said the failure of traction control, ABS, and the tire pressure monitor system occurred about 7 miles after the impact, when she was almost home. My theory is that the curb bump detached or almost detached the battery sensor, and when it detached it set up the possibility of a power surge at some point. When a surge happened in the traction control while driving, it finished off a possibly already failing fuse. Bad theory?