Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems.
It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
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Advisor can run a check.
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: ...
Muting a Call
To Mute a Call
Turn or press the MENU/SELECT knob and select Mute Call.
To Cancel Mute
Turn or press the MENU/SELECT knob and select Mute Call. ...
Removing and Replacing the
Floor Mats
1. Pull up on the rear of the floor
mat to unlock the retainer and
remove.
2. Reinstall by lining up the floor
mat retainer opening over the
carpet retainer and snap into
position.
3. Ma ...