Camera Wiring(Optional): 1. Power cable: red and black. Red - positive reversing light Black - negative reversing light 2. RCA cable: yellow port. insert it into the port '' CAM-IN '' (yellow) of the radio 3. Make sure the '' rear camera control line '', line 9 in last page, is well connected to the of the reversing light positive wire. Therefore, when you are parking, the device will display the rear view image automatically and when the parking is over, you will return to the radio page.