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:
Button Retainer
Floor mats with a button-type retainer.
Removing and Replacing the Floor Mat
1. Pull up on the rear of the mat to unlock and remove.
2. Reinstall the floor mat by lining up the floor mat openings ...
Headlamp Aiming
The vehicle has a visual optical headlamp aiming system. The aim of the headlamps has been preset at the factory and should need no further adjustment.
However, if the vehicle is damaged in a crash, ...
CD/DVD
To select tracks on a CD/DVD:
Press and release or
to go to the next or previous track. ...