See also:

Folding Mirrors
For vehicles with manual folding mirrors, push the mirror toward the vehicle. Pull the mirror out to return to its original position. For vehicles with power folding mirrors: 1. Press (A) to fold ...

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 ...

Power Lumbar
Power Lumbar To adjust the power lumbar support, if equipped: • On vehicles with two-way lumbar, press and hold the top or bottom of the control to increase or decrease lumbar support. • On v ...