I'm in process of installing a backup camera in 2006 e53. Instructions for module call for connecting it and the camera to a 12v ACC circuit. I've been unable to locate one (trial and error method with test light) in the back of the vehicle, don't want to run a wire to the front (although, given the amount of time I've spent, running a wire to the AUX would have been faster). Anyone know if there is an 12v ACC in near the navigation or in the back and what color?