rrruschman wrote:Thanks Mac but that looks like single din and my new deck is double din.
Just throw the bottom bin away and it's a double DIN kit. That's exactly what I bought for my 2009. I don't have an amp, so my install was much easier, so I'm not sure what harness you'll need. Are you planning to reuse the wiring going to the factory amp you want to replace?
Getting rid of OnStar is easy, just disconnect two plugs from the OnStar module under the driver's seat, or pull the MAYDAY fuse from the fuse box under the hood.