hey guys, im new to this forum and to the S2K community... starting off with a quick wire harness question. i just changed out the factory head unit in my 06 s2k and i noticed that there are 2 harnesses which plug into the factory stereo (large blue, small white). the harness kit i bought only connects my stereo to the blue one and the white one is unused. what was the white harness for?

thanks guys

 

Cd Changer, the car is pre wired for the OEM changer