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:
Lumbar Adjustment
Power Lumbar
If available, press and hold the front or rear of the control to increase or
decrease lumbar support. Release the control when the seatback reaches the
desired level of lumbar su ...
Safety
Standard features include antilock brakes, side-impact airbags for the front
seats, side curtain airbags, an electronic stability system, and a tire pressure
monitoring system. For a full list of ...
Window Lockout
This feature prevents the rear passenger windows from operating, except from
the driver position.
Press to activate the rear
window locks. An indicator light will illuminate when the featu ...