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:
Power Steering Fluid
See Engine Compartment Overview for reservoir location.
When to Check Power Steering Fluid
It is not necessary to regularly check power steering fluid unless a leak is
suspected in the syst ...
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 ...
What Makes an Airbag Inflate?
In a deployment event, the sensing system sends an electrical signal
triggering a release of gas from the inflator. Gas from the inflator fills the
airbag causing the bag to break out of the cover. ...