I recently purchased a used 2008 Ford Expedition EL King Ranch edition. The guy that owned the car before me had put in an aftermarket cd player and removed the OEM (AVIC-XD1377zf) Navigation system. I have since put a used AVIC-XD1377zf Nav system back into the truck. My problem is, I pressed the #3 & #6 and went into the Diagnostics portion of the system and I noticed that my subwoofer is "disabled" and I need to enable it. I suppose the vehicle that my current Nav system was in didn't have a subwoofer, bu my Expedition does. Does anyone know how to get more into the programming of this
