Radio

Hello, first, I would check with your local General Motors dealership who administers the legacy technical support of these vehicles. If that doesn't get you anywhere, there's a phone number GM technicians are supposed to call for help per an informational bulletin that was issued. Although it's for technicians, maybe it'd work for your needs too. 1-800-448-0944 You will need radio serial number information, however, to get help. Good luck.