I recently purchased a 2006 Suburban that already had an aftermarket Kenwood in dash stereo with DVD/Nav. I can't figure out how to get sound from the rear, overhead, factory DVD system. The rear dvd will play fine but no sound thru factory speakers or headphone jacks. I don't have the wireless headphones for the system. I'm looking at ordering some but I'm not sure if they will work either. Thought maybe I would see if someone can give me some guidance before I waste money on something that will not work. We have a long trip planned in January and my sanity depends on the kids being distracted by movies.