TTY Users

OnStar has the ability to communicate to the deaf, hard-of-hearing, or speech-impaired customers while in the vehicle. The available dealer-installed TTY system can provide in-vehicle access to all of the OnStar services, except Virtual Advisor and OnStar Turn-by-Turn Navigation.

    See also:

    Dome Lamps
    The interior lamps control located in the overhead console controls both the front and rear interior lamps. : Turns the lamps off. : Turns the lamps on when any door is opened. : Keeps t ...

    Tachometer
    The tachometer displays the engine speed in revolutions per minute (rpm). ...

    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 v ...