recently acquired a 04 deville base model as hell no heated seats, lumbar, or bose. but with that said the radio was gone as well. in its place is 4 av cables and the following wires. black, red, yellow, gray, blue, orange. im putting in a double din stereo by caramouchie (i think that's the right spelling) im able to hook up some of the wires and get power to the unit and when i hook up the av cables that are there to the audio out on the stereo i get sound but it's never coming out all the speakers and i only have two audio outs one left and other right leaving two av cables not hooked up still. im just confused it also looks like i have some kind of adapter under my steering wheel that the 4 av cables are coming from says something about onstar on the bottom of it helps.