Originally Posted by
ccaarmerciill
My Wife's 2006 BMW 330i battery died on us awhile back. After testing the alternator (which was fine) we replaced her battery. A few months later we went on a trip for 2 weeks and when we got back the new battery was dead. After a jump start the car ran fine, but I did some testing to determine the car has a parasitic battery drain. The only aftermarket electric equipment on the car is a laser jammer/ detector which I confirmed pulls no amps when car is off. After testing, the car showed a 220 ma (.22 amp) drain when car goes into "sleep" mode (16 minutes after key fob is far enough away). The fuse that made the biggest difference when pulled 190 ma (.19 amps) was fuse #51 (start stop fuse). What exactly does this control? Comfort access? Just the ignition? I know what circuit I now need to troubleshoot but can't find any information on where to start.
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