You would press the CD/AUX button to play a CD when listening to the radio. The inactive CD will remain safely inside the radio for future listening. This button is also used to switch between multiple discs in the drive if your vehicle is equipped with a multi-CD player. The CD/AUX button is also for the rear entertainment system if your vehicle is equipped with that as well. Unfortunately, I can’t comment on what type of wiring harness you would need to replace the stock one with. I hope this information has helped you!

Elizabeth, Chevrolet Customer Service

 

Hmmm... Is it possible to get my hands on a wiring diagram for this radio?

No OnStar, no built in XM, only 4 speakers, it is about as basic as it can get. Keep in mind that while this is a 2007 model, it is the "classic", which means it is really a 2006 model which was before they changed to the new body style, upgraded radio system, etc...

If I can get the wiring diagram for this radio's plug, I will just cut the wires and solder everything up like I used to do years ago before they had all these aftermarket adapters and things.

I have have to go old-school. haha