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:
Navigation System
If the vehicle has a navigation
system, there is a separate
navigation system manual that
includes information on the radio,
audio players, and navigation
system.
The navigation system prov ...
Recommended Fuel
Use regular unleaded gasoline with a posted octane rating of 87 or higher.
If the octane rating is less than 87, an audible knocking noise, commonly
referred to as spark knock, might be heard when d ...
Heated Rear Seats
WARNING
If you cannot feel temperature change or pain to the skin, the seat heater may
cause burns even at low temperatures. See the Warning under Heated and Ventilated
Front Seats .
...