Start / Stop parasitic battery drain

[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.

[ccaarmerciill]

Did more testing today, unplugged and removed the Final Stage Resistor for the blower (common issue) with no change to the amps being drawn from the battery. I did however notice the amps drop to .08 (80 ma) when I unplugged the Kl. 30g relay (which also was very hot) I read up on this relay and apparently it controls the functions to many systems. So my hope of narrowing this down is proving painful.

In short I have a parasitic battery drain. Pulled every fuse, only one that lowers the amps enough is the "start / stop" fuse #51. The relay for the CAS system also lowers the amps. But this has no narrowed down what specific system I need to troubleshoot (CAS is a big system)

[Kingx27]

I have that same issue. Have you found any fixes??
My vehicle is a BMW 325i 2006 - E90

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[Pcguru7]

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.

Hello Sir I have the same issue with my 2006 BMW 330i Please Please let me know if you find a fix for this issue. I have been dealing with this for a long time.

Thanks