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:

    Selecting the Right Engine Oil
    Selecting the right engine oil depends on both the proper oil specification and viscosity grade. See Recommended Fluids and Lubricants . Specification Use and ask for licensed engine oils with the ...

    Deleting Name Tags
    The system uses the following commands to delete name tags: ► Delete ► Delete all name tags ...

    Compass Messages
    CAL This message is displayed when the compass needs to be calibrated. See Compass. – – – Three dashes will be displayed if the compass needs service. See your dealer for service. ...