GM Service Manual Online
For 1990-2009 cars only

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

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

If your vehicle has a roof rack, loading items onto the roof of your vehicle can interfere with the performance of the XM™ system. Make sure the XM™ Satellite Radio antenna is not obstructed.