I just finished modifying my wife's van (2005 EXL/R&N) to play the DVD on the Nav display! I think the total cost of Radio Shack supplies was about $40 (including relays, connectors, and a project box). The backup camera makes this possible: it sends a composite signal to the Nav unit which converts the signal to RGB before sending the signal to the Nav display. I used a DPDT relay to send the DVD signal (also composite) to the Nav unit input instead of the camera signal. If anyone is interested, I'll put together some instructions.