You have instructions posted somewhere to do this? Aftermarket by any chance?
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no i dont but there are many different aftermarket ones that do have them and that is pretty much what i followed.
basically an aftermarket cam only is a 12v+, ground and the video wire. Any bullet style cam will fit in the tailgate handle you just need to drill a hole. For the power and ground i used signal at the 7 pin harness. then i ran the video wires up to the radio re-pinned them and put them into the harness.
still had to get it turned on by the dealer but they only charged me $50 at the time (back in 13).
the biggest down fall to this method was there is no moving grid lines when you turn i reverse.