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 OnStar Additional Information, and an Advisor can run a check.

    See also:

    Dome Lamps
    The dome lamps are located in the overhead console. They come on when any door is opened and turn off after all the doors are closed. Turn the instrument panel brightness knob located below the dome ...

    Shifting Out of Neutral
    To shift the transfer case out of N (Neutral) do the following: 1. Set the parking brake and apply the regular brake pedal. 2. Turn the ignition to ON/RUN with the engine off, and shift the transmis ...

    Cruise Control
    Cruise Control : Press to turn the system on or off. The indicator light is on when cruise control is on and turns off when cruise control is off. : Press briefly to make the vehicle resume to ...