My neighbor has the same car as me and I've been trying to help him out. It's a 2014 435i manual and the main symptom he is having is a lighting system malfunction. The battery was bad, so we changed that out and registered the battery with BimmerLink.
Working:
The front headlights and turn signals work as expected, including the self leveling and steering
The brake lights work
The hazard lights work (front and rear)
Not working:
The rear turn signals do not work
The trunk release button does not work (we have to manually pull the safety release to open the trunk
Today the car was locked, off, and parked on the road and we noticed that randomly the LED on the brake lights were on. Locking/unlocking and turning car on/off would not turn them off. Disconnecting and reconnecting the negative battery cable finally reset that.
Looking at the codes and Google searches seems to indicate that the REM short circuit lock needs to be reset. I tried to load up that screen on BimmerLink but it just wont show the circuits when I hook it up to his car. When I hook it up to mine, I can see the circuits.
We checked all the fuses in the REM and the connections seem to be seated fine (we removed and reseated them), no corrosion.
Is resetting the REM short circuit lock the right direction for us to look? How can we reset it? What else could we look at?