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:
Windows
WARNING!
Leaving children, helpless adults,
or pets in a vehicle with the
windows closed is dangerous.
They can be overcome by the
extreme heat and suffer
permanent injuries or even death
...
Keyless Locking
If the vehicle has the keyless
access system, this feature allows
you to select whether the doors
automatically lock during normal
vehicle exit. When the ignition is
turned off and all doors ...
Grade Braking
The Grade Braking shift modes can be activated by pressing the button on the
end of the shift control lever. While in Range Selection Mode, Grade Braking is
deactivated allowing the driver to sele ...