Basic Trailer Wiring
All regular, extended cab and crew cab pickups have a seven-wire trailer towing harness.
For vehicles not equipped with heavy duty trailering, the harness is secured to the vehicle's frame behind the spare tire mount. The harness requires the installation of a trailer connector, which is available through your dealer.
If towing a light-duty trailer with a standard four-way round pin connector, an adapter is available from your dealer.
See also:
Roadside Assistance Program
U.S.: 1-888-881-3302
TTY Users (U.S.): 1-888-889-2438
Canada: 1-800-268-6800
Mexico: 01-800-466-0801
As the owner of a new GMC, you are automatically enrolled in the Roadside Assistance program.
...
Rear Window Lockout
The rear window lockout feature prevents the rear passenger windows from operating, except from the driver position.
Press to activate the rear window lockout switch. The LED light comes on when a ...
Inserting a Disc
Insert a disc partway into the top slot, label side up. The player pulls it in and the disc should begin playing. “Loading Disc” shows on the radio display. At the same time, the radio displays a ...