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:
Tire Terminology and Definitions
Air Pressure: The amount of air inside the tire pressing outward on each square inch of the tire. Air pressure is expressed in kPa (kilopascal) or psi (pounds per square inch).
Accessory Weight: The ...
SERVICE PARKING BRAKE
This message is displayed when
there is a problem with the electric
parking brake. See Parking Brake for more information.
Take the vehicle to your dealer. ...
Radio Menus
Radio menus are available for AM,
FM, and XM, if equipped.
Turn the Menu knob to open the
main radio menu for that band. ...