I also have a question on this! I don't care for the OnStar services, at all. They can't remotely do shit for me, honestly, besides call 911. I want to remove the radio, in replacement for a double din radio. There are settings for the car that are programmed into this stock radio, such as door chime, lights, and whatnot. Will these settings be retained, and will everything work normally when the radio is replaced with an aftermarket one? Thanks!