I'm in process of installing a z130bt on my 07 grand cherokee which has factory back up camera. I tapped the signal and shield and made them rca compatible now. I'm trying to get to the back up signal. In the wire harness there was a 3rd wire and it said camera return. That doesn't seem to be the back up signal. Besides running to reverse light. Anyplace else i can tap? Perhaps behind radio? I spoke with pac as I'm using the rp4-ch11 and they gave me this link

http://connectors.dcctools.com/

I was looking. Can I use the wires to park assist button to get signal?

There's park assist on/off and park assist indicator signal.

It's safe to assume that the park assist receives a back up signal, correct since it kicks on when put in reverse.

Thanks in advance

Jason.