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:

    Battery Power Protection
    The battery saver feature is designed to protect the vehicle's battery. If some interior lamps are left on and the ignition is turned off, the battery rundown protection system automatically tu ...

    Chime Volume
    This allows selection of the chime volume level. Press SELECT when Chime Volume is highlighted. Turn the Menu knob to select Normal or High. Press SELECT to confirm the selection. Press BAC ...

    Engine Coolant
    The cooling system in the vehicle is filled with DEX-COOL® engine coolant mixture. See Recommended Fluids and Lubricants and Maintenance Schedule for more information. The following explains ...