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:
How Does an Airbag Restrain?
In moderate to severe frontal or near frontal collisions, even belted
occupants can contact the steering wheel or the instrument panel.
In moderate to severe side collisions, even belted occupants ...
Before Driving
The RSE is designed for rear seat passengers only. The driver cannot safely view
the video screen while driving and should not try to do so.
In severe or extreme weather conditions, the RSE system ...
Auto Rear Defog
This will allow you to turn the auto rear defog on or off.
Press the MENU/SELECT knob when Auto Rear Defog is highlighted to open the
menu.
Turn the knob to highlight On or Off. Press the knob ...