Hi all! I'm a relatively new Escalade owner and there are lots of things to learn!! My husband and I have tried literally everything we can think of to get the headrest DVD players to show what is inserted into the main, front DVD player. Nothing works. Seems like an obvious thing for it to do, easily, but nothing does it. We want to be able to put a DVD in up front, have it play on the back two screens, while having the sound playing throughout the car. Any help or advice on this? Thanks in advance!