I tried searching but I didn't see anything. I put a Pioneer nav into my 05 and now my factory overhead will not power up. The dvd player has power and all of the fuses are good. Has anyone else had this issue?
You need the original radio to power your RES screen. Search for the terms aftermarket and NAV and RES and see if you can find some older threads. There were a few where folks were inquiring on how to add NAV to RES equipped vans.