Unable to Connect to OnStar Message
If there is limited cellular coverage or the cellular network has reached maximum capacity, this message may come on. Push 
to try the call again or try again after driving a few miles into another cellular area.
See also:
Compressed Audio or Mixed Mode Discs
The radio plays discs that contain both uncompressed CD audio and MP3/WMA files depending on which slot the disc is loaded into.
The DVD Player only reads uncompressed audio and ignores MP3/WMA files ...
Satellite Radio Antenna
The XM Satellite Radio antenna is located on the roof of the vehicle.
Keep the antenna clear of obstructions for clear radio reception.
If the vehicle has a sunroof, the performance of the XM system ...
Coverage
Services are provided up to 5 years/160 000 km (100,000 mi), whichever comes first.
In the U.S., anyone driving the vehicle is covered. In Canada, a person driving the vehicle without permission from ...