I recently installed an EZT camera on my 2013 GTI with the RNS315 receiver . The install itself went ok and everything is getting power like it should but when I put the car in reverse the only thing that happens is it unlocks the hatch(sometimes). I haven't coded the the camera to the radio yet. Am I correct in assuming that till that's done I'm not going to be able to properly troubleshoot this? Thanks!