I had JBL MS8 digital processor installed in my 2006 X5, and have decided to trade it in for a X3 3.0d. I pulled out the MS8 unit and reconnected the OEM wiring for the speakers. Now my reversing camera is not working and the screen blacks out and even when I am in drive doesn't return to normal operations.

But if you don't engage reverse the screen functions are fine including OBD, navigation, phone and audio. Any idea what this might be ... a blown fuse?

Any help would be greatly appreciated.