i have the avh-p8400bh and have the same issue when i put the car in reverse the camera shows p but then when i switch sources it wil stay on the source screen for seconds and then go back to the reverse camera screen, i read previous post but dont understand one thing...my reverse purple/white from the back of stereo is connected to my reverse light for signal... how or why does it need to be tied into the red power lead??? i have the kenwood cmos-300 camera...does it have anything to do with my relay??