Horn

To sound the horn, press the center pad on the steering wheel.

    See also:

    Radio Menus
    Radio menus are available for AM and FM. Turn the MENU/SELECT knob to open the main radio menu for that frequency. ...

    What to Use
    WARNING! Adding only plain water or some other liquid to the cooling system can be dangerous. Plain water and other liquids, can boil before the proper coolant mixture will. The coolant warn ...

    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 ...