GM Service Manual Online
For 1990-2009 cars only

The XMâ„¢ Satellite Radio antenna is located on the roof of your vehicle. Keep this antenna clear of snow and ice build up for clear radio reception.

Loading items onto the roof of your vehicle can interfere with the performance of the XMâ„¢ system. Make sure that the XMâ„¢ satellite antenna is not obstructed.