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:
Dual Mode
This dual screen symbol displays when the screen is in dual mode.
Dual mode displays the route on half of the screen and a maneuver or Interstate
Exit list on the other half. The Interstate Exit ...
Air Vents
Use the air outlets located in the center and on the side of the instrument panel
to direct the airflow.
Operation Tips
Keep the hood and front air inlets free of ice, snow, or any other obstru ...
Total Weight on the Vehicle's Tires
Be sure the vehicle's tires are inflated to the inflation pressures found on
the Certification label on the driver door or see Vehicle Load Limits
for more information. Make sure n ...