had something similar happen on my avhp4300.. there's a rear-view button that appears along the top of the screen only when you press the source menu and if its constantly highlighted the camera will try to activate.. i wired my camera to the ignition of my truck not the remote wire out of the unit, so when my truck is on, it acts as a rear view mirror so i can see on the highway or going uphill when i activate that button. if you only want it as a back up camera you need to wire the purple wire to the positive side of the reverse lights and select polarity as positive in the settings menu. An