http://forums.vwvortex.com/showthread.php?5566414-Mk6-stereo-wiring-diagram
Car Radio Battery Constant 12v+ Wire: Red/Yellow
Car Radio Accessory Switched 12v+ Wire: This vehicle uses the CAN-Data system for accessory turn on.Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: Part of the Antenna Connector
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Brown/Green
Left Front Speaker Negative Wire (-): Brown/Blue
Right Front Speaker Positive Wire (+): Brown/Red
Right Front Speaker Negative Wire (-): Brown/Black
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Red/White
Left Rear Speaker Negative Wire (-): Brown/White
Right Rear Speaker Positive Wire (+): Red/Brown
Right Rear Speaker Negative Wire (-): Brown/Violet