TTY Users

OnStar has the ability to communicate to the deaf, hard&-ofhearing, 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:

    Universal Remote System
    Universal Remote System Vehicles with the Universal Remote System will have these buttons located in the headliner. This system provides a way to replace up to three remote control transmitters us ...

    Interior
    The Sierra showcases two different interior designs. Work Truck and SLE models are more utility-minded, with large controls and door handles that can be operated while wearing gloves. The SLT offe ...

    Door Locks
    To lock or unlock the vehicle from the outside, press or on the Remote Keyless Entry (RKE) transmitter. There is a power door lock switch on the instrument panel. There are power door lock s ...