Not wanting to ressurect an old thread...
Did a search, and had great sucees with the info found.
My OBC was chiming in when i switched the lights on, with message "number plate light". Both were working fine.
Disconnected the headlight levelling motors, and now all quiet for a week or so.

Thanks to all that had contributed.

http://www.bimmer.info/forum/showthr...er+plate+light