As long as you have the onstar adapter, harness, and antenna adapter you're golden. Remove the ring around the ignition cylinder first using something flat. A screwdriver works well. Then start pulling the center stack trim off starting at the top corner. Once it's loose, reach around and unplug the DIC. Then to get to the radio, you'll have to remove all the center stack components starting from the bottom as they are all interlocked. Hope this helps