[Northsea]

Hi,

I have problem.

320d Xdrive GT 2016.

New battery installed by BMW may 2023.
No comfort access.
After delivery new Gladen loud system and Defa alarm installed.

Last months - the battery was drained 2 times, last time the car was parked 3 days. A mechanic checked, he thought it was the DSP to the sound system. The fuse is out now. Worked well after the car was parked 9 days this time.

I went for a ride today, then start and stop was activated and when I released the brake the car did not start - it was like a Christmas tree in the display. I pushed 4 times on start and then it started without any fault message in the idrive. Then the car was normal.


Before I leave it to BMW - do somebody have suggestion what I can check? Is there an another battery for start and stop that can fail?

[Billfitz]

There are many potential sources of parasitic power drain. A common one is the dash display. Step 1 is to read the error codes. If that doesn't reveal the problem you have to track down the source of the parasitic drain. Google it.

[Oksamit78]

Highly likely it is the DEFA alarm system that is causing parasitic power drain. I've had similar battery drain issues on my other car with aftermarket alarm/remote start system until it was unplugged completely.

Suggest to consider battery tender for all times you have car parked if possible.