When I removed the OEM head unit to install my new one, I noticed that it had 2 harnesses going to it. I was wondering what the second one was used for (white)? I know the blue one will go to new wiring harness for the new deck. Just curious and wanted to know. My new deck works perfectly fine.

 

i think you're referring to the bus cable connector for the OEM cd changer.

 

That must be it then.....Thanks!