I just recently installed a 1300nex in my 06 Expedition. I previously had a Jensen double din dvd nav which I had a reverse camera connected too and it worked fine. However, with the Pioneer, I cant get it to work properly. It actually turns the camera on when I put it in park or drive but not in reverse. It also shows just a black screen. Ive tried different wirings and settings but nothing changed. Is this something that is common among these units?  Thanks 

check the setting on the radio for reverse trigger. it should be POS. not NEG.

Ive tried that as well. In negative, nothing happened at all. In positive, it came up while in park and in drive.