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 ...

USB Support
The USB connector is located on the instrument panel or in the center console, and uses the USB 2.0 standard. ...

Power Windows
Crew Cab Shown If available, the power window switches are located on each door. The driver door also has a switch for the passenger and rear windows. Push the switch to lower the window. Pull ...