I'm planning on installing an aftermarket backup camera into my 2002 Accord LX. I already have an aftermarket head unit with a universal backup camera port and a reverse wire lead.

After surveying my car, I know how I can tap into the reverse light to give the camera power, but I don't what what wire to run to connect to the reverse lead on the head unit so the camera comes on automatically.

Can anyone tell me what wire to connect to the head unit so the reverse camera shows automatically?