I have the same vehicle, the same issue but a JVC receiver. Wanted to see if you had found a resolution to the problem.
I have new Kenwood DNX696S with maestro rr with av and ch1 harness. all wired correctly. I have Chrysler town and country 2014 with dvd screens.
Here is the issue ---> when the dvd play is on back up camera is jumping into the picture and you can see the guide lines blinking into the dvd play. And vice versa when i get backup camera on the deck screen i can see a dvd play in the background.
Does anyone know what could be wrong? Any help will be greatly appreciated.
Thank you so much guys