Originally Posted by lieutenantcolumbo
When I installed my reverse camera, I just tapped into the reverse light at the back of the car since I had to run the camera wire to the front anyway.
The HU has to sense when the car is in reverse to switch the display to the camera image. My camera has no "reverse" wire, it only has a long cable with proprietary connector that plugs into the HU. Camera has power from this connection. The reverse wire is in the HU wiring harness. Pioneer in my GMC truck was similar. I know the reverse light is an option, but I'd rather not have to run the HU cable all the way back, as I've already buttoned everything up from the camera install. There has to be a 12V+ reverse wire somewhere up front.