Just got the 512 unit from Crutchfield today with a VW wiring harness adapter. I got the pink wire hooked up to the power amp on for the Kenwood, but I get no sound from the rear speakers at all. I also tried to set up in the menu but it has a lock symbol on the audio setup menu and won't let me turn on the sub. Anyone ever installed this unit in a 04 and had success?