2003-04 A4 B6 I just finished installing a Pioneer AVIC-D3 and used the Metra 70-1787 Harness w/ the integrated RCAs. Im getting some engine noise, although very faint its still annoing. I'm getting popping noise when the system is turned off, could it be the acc wire I used? I used a 12v acc that goes from the kick panel into the door. It D3 work like the stock Bose, after the key is removed the unit stays on till a door is open. If anyone knows what im doing wrong and also if anyone knows what color is the illumination wire behind the light switch that would also help me because im getting 2 12v when switched on.