See also:

Turn Signal Indicator
The vehicle may also have a turn signal indicator on the mirror. An arrow on the mirror flashes in the direction of the turn or lane change. ...

Steering Wheel Controls
Steering Wheel Controls If available, some audio controls can be adjusted at the steering wheel. : Press to go to the next favorite radio station, track on a CD, or folder on an iPod® or USB ...

Customer Assistance Offices (U.S. and Canada)
GMC encourages customers to call the toll-free number for assistance. However, if a customer wishes to write or e-mail GMC, the letter should be addressed to: United States GMC Customer Assistance ...