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:
Fuses and Circuit Breakers
If the vehicle is a hybrid, see the hybrid supplement for more information.
The wiring circuits in the vehicle are protected from short circuits by a combination
of fuses, circuit breakers and fusi ...
How Does an Airbag Restrain?
In moderate to severe frontal or near frontal collisions, even belted
occupants can contact the steering wheel or the instrument panel.
In moderate to severe side collisions, even belted occupants ...
Security Light
The immobilizer light should come on briefly as the engine is started.
If it does not come on, have the vehicle serviced by your dealer.
If the system is working normally, the indicator ligh ...