I've tried now to put fan fully on yet no faults. However, stick the multimeter in cigaret lighter and tried to shut both fron windows while they were already shut.
The voltage dippped from 14.5 to 13.3. No fault showed up but I was supprice to see a dip. I could also audiable confirm it because fant which was fully on changed speed for a bit.




Any ideas? where is the battery control module in X5?


Again, never had a problem with starting vehicle nor empty battery. However, could it be the battery?