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      01-09-2020, 07:11 AM   #2
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Drives: 2011 E90 M3 ZCP
Join Date: Mar 2014
Location: Stockholm, Sweden

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Originally Posted by VrooM3 View Post
For a few days, the car would at times not unlock the door, and when i would do it manually with the key in the door, it would not have power locks etc, not turn anything on when i put the key in the ignition.

I was reading elsewhere that it may be the receiver for the FOB, wanted some insight from you guys before i ordered the part. Upon inspection, i noticed the battery area had flooded and submerged the battery halfway in water. I uninstalled the battery, drained the water and cleaned any rust buildup, the power lead to the starter had rusted and i cleaned and reinstalled it. I then checked all the fuses on top of the battery and all had continuity.

Anything else i should check or is it most likely the IBS or is it the CAS?

I let the battery charge while it was out and it held a full 13.5V, i then checked continuity from the engine bay power leads (where you connect a trickle charger) and there was consistent voltage across to the battery without any drop.
Bummer with the water coming in, seen it before so seems not uncommon. As long as the water "only" reached half way maybe it actually haven't shorted anything. Did you read about the battery cable re-call? Haven't experienced this myself but read about cars that went completely dead, however in this case easy fix once identified.

Good luck!