See also:

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 ...

Steering Wheel Controls
If equipped, some audio controls can be adjusted at the steering wheel. (Next) : Press to go to the next favorite radio station, track on a CD, or folder on an iPod® or USB device. (Previous/En ...

Operation
Radio with CD, Radio with CD/USB Similar Radio with CD, DVD, and USB Port The vehicle may have one of these radios as its audio system. ...