just bought my 07 avalanche, its an LS model which I believe did not come with a dvd player. the previous owner must have purchased the factory dvd head unit and overhead screen from a junk yard( its got yellow marker part numbers on both). the problem I am having is that he neglected to get the wiring harness that goes from the head unit to the screen. the head unit works when you put a dvd in it but obviously no picture. Another problem is that the stereo works but I have to crank it all the way to hear it. Could this be because he didn't get the amplifier as well??? I called the local chevy dealer but they couldn't give me any info because the vin dosent list the truck as having a dvd player. It pisses me off to have something in the truck that dosent work. If anyone has some info on fixing my problem I would greatly appreciate it.