I am interested in any information that you might have on controlling 2 headrest dvd player through the dash board radio unit. I have a '04 Suburban with the original radio. I would like to get a new radio unit and 2 headrest dvd players. I want to be able control the dvd players (putting a new dvd in, pushing play, fast forward, and anything else) from the driver seat through the dash radio. Here is the problem... I don't know how to look up the RIGHT products. I know I can go somewhere and get this done, but i'm trying to save $ by doing the installation myself. thank you for your help.