I recently bought a 2008 cayenne with the rear camera option, my problem is that when i put the vehicle in reverse the camera pops out but my pcm screen dosent show an image. Only black with the red letters saying this should not replace looking over your shoulder.. I cheked the wiring and everyt,hing looks ok, the only thing that bothers me is that he camera is getting only 6V but im not sure what the correct voltage is. Any idead on how to solve my problem? Im out of warranty

 

had a similar problem in my 2008 GTS and when this was IN warranty they replaced the entire pcm screen.
hope you don't have to go there, but might be the option.
Get it checked by service, then decide your options after...

 

Interesting, was your pcm working for everything else? I thought it was a camera problem, but it might be the pcm input thats broken

 

Everything else showed up minus the rear camera.