Hi Everyone,
I just got the AVH-P4200 with the AVIC-U220 navigation add on. I wired up the head unit, used the relay bypass, and everything was working great, could view DVD and videos off an SD card. I then hooked up the U220, and now all it does is display the warning message locking out the video. I didn't have the u220 grounded through the relay so I thought that might be the problem, so I switched it, but still no go. Am I going to have to just wire it up to a switch to bypass the parking brake, or is there another way to go about this with a relay. TIA.
