See also:

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-vehicl ...

Engine Coolant Temperature Warning Light
The engine coolant temperature warning light comes on briefly when the vehicle is started. If it does not, have the vehicle serviced by your dealer. If the system is working normally, the indicator ...

Using the “Digit Dial” Command
The digit dial command allows a phone number to be dialed by entering the digits one at a time. After each digit is entered, the system repeats back the digit it heard followed by a tone. If an unwa ...