See also:

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 acce ...

Service Only Mode
This power mode is available for service and diagnostics, and to verify the proper operation of the malfunction indicator lamp as may be required for emission inspection purposes. With the vehicle ...

Front Fog Lamp Light
For vehicles with fog lamps, this light comes on when the fog lamps are in use. The light goes out when the fog lamps are turned off. See Fog Lamps  for more information. ...