See also:

Turn and Lane-Change Signals
An arrow on the instrument panel cluster will flash in the direction of the turn or lane change. Move the lever all the way up or down to signal a turn. Raise or lower the lever until the arrow ...

Lamp Messages
AUTOMATIC LIGHT CONTROL OFF This message displays when the automatic headlamps are turned off. This message clears itself after 10 seconds. AUTOMATIC LIGHT CONTROL ON This message displays when th ...

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 ...