horn GMC SIERRA 2021 Get To Know Guide

4F Optional equipment
KEYLESS ACCESS SYSTEMF
REMOTE KEYLESS ENTRY TRANSMITTER (KEY FOB)F
The Keyless Access System enables operation of the doors and tailgate without removing the Remote Keyless Entry transmitter (key fob) from your pocket or purse.
The key fob must be within 3 feet of the tailgate or the door being unlocked.
KEYLESS UNLOCKING
With the key fob within range:
Press the button on the driver’s door
handle to unlock the driver’s door; press
again within 5 seconds to unlock all
doors and tailgate.
Press the button on a passenger door handle to unlock all doors and tailgate.
Press the lower button on the tailgate to lower the standard tailgate.
KEYLESS LOCKING
With the ignition off, the key fob removed from the vehicle, and all doors closed:
Press the button on any door handle to lock all doors and tailgate immediately.
If Passive Locking is turned on in the Settings menu, all doors will lock automatically after a short delay.
Note: To change the door lock and unlock settings, go to Settings > Vehicle > Remote Lock,
Unlock, Start.
See Keys, Doors and Windows in your Owner’s Manual.
Lock
Press to lock all doors
and tailgate.
Unlock
Press to unlock the
driver’s door or all doors
and tailgate.
Remote Windows F

Press and hold the
Unlock button until the
windows are fully open. To enable, select
the Settings menu on the infotainment
screen. Go to Settings > Vehicle > Remote
Lock, Unlock, Start.
Remote Mirrors F
Press and hold the Lock/Unlock button
for 1 second to fold/unfold the power
mirrors. To enable, go to Settings > Vehicle > Comfort and Convenience.
Vehicle Locator/Panic Alarm
Press and release to locate your vehicle.
The exterior lamps flash and the horn
chirps 3 times
Press and hold to activate the alarm.
Press again to cancel the alarm.
Power Release Tailgate F

Press twice to lower the tailgate.
Remote Vehicle StartF
Press and release the
Lock button and then press and hold the button until the turn signal lamps flash to start
the engine from outside the vehicle. After
entering the vehicle, turn on the ignition.
To cancel a remote start, press and hold
the button until the parking lamps turn off.
See Keys, Doors and Windows in your Owner’s Manual.

18F Optional equipment
TRAILERINGF
PROGRADE TRAILERING SYSTEMF
The in-vehicle trailering app on the info-
tainment screen allows customized trailer
profiles with a variety of helpful towing
assistance features, including a hitching
and setup checklist, trailer tire pressure and
temperature monitoring
F, trailer light test-
ing, Jack-Knife Alert, trailer length indicator,
trailer theft detection and more. Trailering
App information also is available with the
myGMC mobile app.
Note: The Trailering App will monitor trailer presence, even while the vehicle is off, by periodically
checking the trailer lighting circuits. On trailers equipped with LED lights, these periodic checks may
cause the trailer lights to flash. This flashing will become more frequent if Theft Alert is enabled.
HITCH AREA LIGHTING
Press the Cargo Lamp button on the left side of the instrument panel to turn
the cargo bed lamp or conventional hitch lamp on/off.
TRAILERING INFORMATION LABEL
The Trailering information label, located by the driver’s door latch, provides vehicle-
specific weight information to help when loading the vehicle.
INTEGRATED TRAILER BRAKE CONTROL (ITBC)F
The ITBC system can be used to adjust the
power output, or Trailer Gain, to the trailer
brakes. The control panel is on the center
of the instrument panel. ITBC information
is displayed on the ITBC page on the Driver
Information Center.
Squeeze the control together (right s ide does not move) to manually apply the
trailer brakes.
Adjust the Trailer Gain by pressing the +/– adjustment buttons. See Driving and Operating in your Owner’s Manual.
TRUCK TIRE PRESSURE MONITORING SYSTEM
The Low Tire Pressure warning light on the instrument cluster illuminates when one
or more of the vehicle’s tires is significantly underinflated. Fill the tires to the proper tire
pressures listed on the Tire and Loading Information label, located below the driver’s
door latch. Current tire pressures can be viewed on the Driver Information Center.
With the ignition On or in Accessory mode, the Tire Fill Alert will provide visual and
audible alerts to help with inflating a tire to the recommended tire pressure (does not apply to spare tire). When the recommended pressure is reached, the horn sounds and
the turn signals change from flashing to solid.
Note: Refer to your Owner’s Manual for accessory trailer tire pressure monitoring system
information.
See Vehicle Care in your Owner’s Manual.