GM Service Manual Online
For 1990-2009 cars only

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

If the vehicle has a sunroof, the performance of the XM system may be affected if the sunroof is open.

Loading items onto the roof of the vehicle can interfere with the performance of the XM system. Make sure the XM Satellite Radio antenna is not obstructed.