I have a 2008 Grand Prix 3.8 with a single disc CD and satellite ready radio. The screen lighting has dimmed on half of it, and it is getting annoying to look at. I have been looking for options and I either want to replace with an aftermarket unit or buy a 6 disc factory unit. I am seeing some talk about having to program the radio if I go with a factory replacement. What is that about? Also, I have found several 6 disc factory units with part# 21004246, are those satellite ready? Is there anything special I need to do if I went with an aftermarket unit other than buying a mounting kit and harness?
thanks for any help
