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:
Average Vehicle Speed
The Average Vehicle Speed display shows the average speed of the vehicle in
kilometers per hour (km/h) or miles per hour (mph).
This average is calculated based on the various vehicle speeds recor ...
Starting the Vehicle
1. Aim the Remote Keyless Entry
(RKE) transmitter at the vehicle.
2. Press and release .
3. Immediately after completing
Step 2, press and hold for at
least four seconds or until the
vehicl ...
Power Seat Adjustment
WARNING
You can lose control of the vehicle if you try to adjust a driver seat while
the vehicle is moving. The sudden movement could startle and confuse you, or make
you push a pedal when y ...