I have been trying to install a Pioneer P4200DVD into a 2006 A4. Purchased the deck from a seller on eBay and came with harness and 12V relay for bypass. Purchased the CTSAD003 Harness, 40-VW54 Antenna Adapter, and Metra 99-9107b dash kit for the install. After wiring everything up, pretty easy just matched the wire colors, and plugging into the car to check the deck will not show anything. If I hit buttons the speakers will beep like it is doing something but nothing happens. There is no radio that comes through or static. I can also touch the screen and hear beeps as if something is happening. Not sure if it is the harness to the Pioneer deck or just one of the wires. Possibly the illumination wire. Has anyone else had any dealing with this deck before or seen this problem?