I have a 2006 Chevy Cobalt LS. I recently received a "Pioneer DEH-65BT CD Receiver with Bluetooth, MIXTRAX, Pandora and iPod" for christmas. The CD player plugs in and powers on however no sound comes out. The fuses have been replaced, so they are not the issue. We exchanged the CD player for a new one and professionals from Audio One in Niagara Falls, NY had no idea why it would not work.

Anyone have any ideas?

I have recently learned that a wiring harness called Metra 70-2103 is needed? Is this relevant to my model?

Do I need to a GM audio adapter too?