You need to take your car to an audio shop to determine where the wiring problem is at your OEM amp.
Originally Posted by Jvice77
Did any of these modification effect your bluetooth or navigation? The reason I'm asking is that I just purchased a 06 750Li and the previous owner installed an Alpine amp in the trunk (powers all inside speakers - no aftermarket sub). When I make a call or try to use my navigation I cannot hear any sound. Does installing an amp cause the blue tooth not to work?
This is outside the scope of this thread.
Last edited by Technic; 11-09-2012 at 03:47 PM.