You may not get error messages but
The BMW repair computer at the dealership will not be able to make
repairs to your car unless you remount the OEM Head Unit
or move it to the trunk or somewhere with it still hooked up to the can bus and with power running to it.
The guys with 335's had to do this a lot when they had HpFp problems . One guy showed up on this board with a 328 he had to have something replaced in his anitlock break system it needed calibrating from the BMW computer but since he bought the car used with and aftermarket head unit in it this could not be accomplished. I think the guys on the coding board have a way around this but BMW will tell you to return the car to stock condition so there repair computer won't choke.
Last edited by ctuna; 09-07-2012 at 08:54 PM.