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:
Antilock Brake System (ABS)
This vehicle has the Antilock Brake System (ABS), an advanced electronic
braking system that helps prevent a braking skid.
When the engine is started and the vehicle begins to drive away, ABS chec ...
Vehicle Locator Lights
This allows the vehicle locator lights to be turned on or off.
Press the MENU/SELECT knob when Vehicle Locator Lights is highlighted. Turn
the knob to select On or Off. Press the knob to confirm a ...
Change Compass Zone
The vehicle may have this feature.
To change the compass zone
through the DIC, see Compass. ...