17
Automatic Transmission
Integrated Trailer Brake Control (ITBC)F
Range Selection Mode
Range Selection Mode allows the driver to select the range of gears desired for the cur-rent driving conditions.
The ITBC system can be used to adjust the amount of power output, or Trailer Gain,
available to the trailer brakes. The control panel is located on the left side of the instru-ment panel. ITBC information is displayed on the Driver Information Center.
1. Move the shift lever to the Manual (M) position.
2. Press the + (plus) or – (minus) button on the shift lever to select a lower or higher gear. An M and the current gear will be
displayed on the Driver Information Center.
The transmission will be limited to the gear selected and lower gears. If vehicle speed is too high or too low for the requested gear, the shift will not occur.
Tow/Haul Mode
The Tow/Haul Mode adjusts the transmission shifts to reduce shift cycling, such as when towing or hauling heavy loads or driving on steep grades. When towing, use the Tow/Haul Mode to prevent damage to the engine or transmission.
Press the Tow/Haul Mode button on the end of the shift lever to turn the system on or off.
GMC Trailering Guide App
The free trailering guide app includes maximum trailer weight ratings by model along with trailering information on hitches and equipment, GMC trailering technologies, safe trailering techniques and more. Currently available for the iPad®, download the mobile app from the iPad’s app store.
See Driving and Operating in your Owner Manual.
Adjust the Trailer Gain by pressing the +/– adjustment buttons on the control panel.
Squeeze the levers together on the control panel (left lever does not move) to manually apply the trailer brakes.
See Driving and Operating in your Owner Manual.
F Optional equipment
19
Sunroof Controls
The sunroof controls are located on the overhead console.
Power Rear WindowF
SunroofF
SLIDETILT Express Open/
SLIDE TILT
Close
Fully press the rear of the SLIDE switch to express open the sunroof. Gently press and hold the switch to partially open the sunroof.
Fully press the front of the SLIDE switch to express close the sunroof. Gently press and hold the switch to partially close the sunroof.
SLIDE TILTVent/
SLIDE TILT
Close
Press the rear of the TILT switch to vent the sunroof from the closed position.
Press the front of the TILT switch to close the sunroof.
See Keys, Doors and Windows in your Owner Manual.
The power rear window switch is located on the overhead console. Press the switch to open the rear window.
Pull the switch to close the rear window.
Note: The power rear window cannot be operated manually.
See Keys, Doors and Windows in your Owner Manual.
Diesel Exhaust Brake (Diesel Models Only)
The engine exhaust brake enhances the vehicle brake system by automatically downshift-ing the transmission, depending on the length of time the brakes are applied.
Press the Diesel Exhaust Brake button on the center of the instrument panel to turn the system on or off.
See your Duramax Diesel Owner Manual.
Sunshade
Open and close the sunshade manually by pulling it rearward or forward.
F Optional equipment
