Turn-by-Turn Navigation
1. Push 
to connect to a live Advisor.
2. Request directions.
3. Directions are downloaded to the vehicle.
4. Follow the voice-guided commands.
See also:
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 ...
California Perchlorate Materials Requirements
Certain types of automotive applications, such as airbag initiators, seat belt pretensioners, and lithium batteries contained in Remote Keyless Entry transmitters, may contain perchlorate materials.
...
Playing the Radio
For vehicles equipped with the MyLink or IntelliLink infotainment system, see
the separate MyLink/ IntelliLink Features and Functions Guide for more information.
Audio Source
VOL/ (Power/Volume): ...