I have a 2009 avalanche and trying to figure out why it doesn't have a tab for the XM radio. It is a touch screen and I have pulled the glove box down and confirmed there is a XM module behind the glove box. The onstar also is not working. I dont know if it is connected to the xm not working. The only tabs I have are am, FM and aux, there is an empty tab but it lights up when I put a CD in. I pretty sure it is suppose to have it because the truck is loaded with all the options and does have the module for xm.