See also:

Reading Lamps
These lamps are located on the overhead console. These lamps come on automatically when any door is opened. For manual operation, press the button next to each lamp to turn it on or off. ...

Customer Assistance for Text Telephone (TTY) Users (U.S. and Canada)
To assist customers who are deaf, hard of hearing, or speech impaired and who use Text Telephones (TTYs), GMC has TTY equipment available at its Customer Assistance Center. Any TTY user can communicat ...

Forward Collision Alert (FCA) Warning Light
These lights are located on the center of the instrument panel. The vehicle ahead light comes on when a vehicle is ahead and a possible collision can occur. The forward collision alert comes o ...