2021 GMC SIERRA keyless

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Keys, Doors, and Windows 33
The security light, in the instrument cluster,
comes on if there is a problem with arming
or disarming the theft-deterrent system.
The system has one or more RKE
transmitters matched to an immobilizer
control unit in your vehicle. Only a correctly
matched RKE transmitter will start the
vehicle. If the transmitter is ever damaged,
you may not be able to start your vehicle.
When trying to start the vehicle, the
security light may come on briefly when the
ignition is turned on. If the engine does not
start and the security light stays on, there is
a problem with the system. Turn the
ignition off and try again.
If the vehicle will not change ignition modes
(ACC/ACCESSORY, on, off), and the RKE
transmitter appears to be undamaged, try
another transmitter. Or, you may try placing
the transmitter in the transmitter pocket
located in the center console. SeeRemote
Keyless Entry (RKE) System Operation (Key
Access) 010 or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 013.
If the ignition mode will not change with
the other transmitter or with the
transmitter in the transmitter pocket, your
vehicle needs service. If the ignition does change modes, the first transmitter may be
faulty. See your dealer who can service the
theft-deterrent system and have a new RKE
transmitter programmed to the vehicle.
It is possible for the immobilizer system to
learn new or replacement RKE transmitters.
Up to eight transmitters can be
programmed for the vehicle. To program
additional transmitters, see "Programming
Transmitters to the Vehicle" under
Remote
Keyless Entry (RKE) System Operation (Key
Access) 010 or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 013
Do not leave the transmitter or device that
disarms or deactivates the vehicle theft
system in the vehicle.
When equipped with a key, if the engine
still does not start, and the key appears to
be undamaged, try another ignition key.
It may be necessary to check the fuse. See
Fuses and Circuit Breakers 0353. If the
engine still does not start with the other
key, the vehicle needs service. If the vehicle
does start, the first key may be faulty. See
your dealer. It is possible for the
immobilizer system to learn new or
replacement keys. Up to eight keys can be
programmed for the vehicle. To program additional keys, see
Keys (Key Access)07or
Keys (Keyless Access) 09. Do not leave the
key or device that disarms or deactivates
the vehicle theft system in the vehicle.
See your dealer to get a new key blank cut
exactly as the ignition key that operates the
system.
Exterior Mirrors
Convex Mirrors
{Warning
A convex mirror can make things, like
other vehicles, look farther away than
they really are. If you cut too sharply
into the right lane, you could hit a
vehicle on the right. Check the inside
mirror or glance over your shoulder
before changing lanes.
Standard Mirrors
The passenger side mirror is convex shaped.
A convex mirror's surface is curved so more
can be seen from the driver seat.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
36 Keys, Doors, and Windows
Turn Signal Indicator
If equipped, the mirror has turn signal
indicator lights, which flash in the direction
of the turn or lane change.
Task Lighting
If equipped, task lighting projects light from
the outside mirrors to the sides of the
vehicle. SeeTask Lighting 0144.
Puddle Lamps
If equipped, puddle lamps project light from
the bottom of the mirror to the area of
ground below the driver and passenger
doors. See Entry Lighting 0146 and
Exit Lighting 0146.
Memory Mirrors
The vehicle may have memory mirrors. See
Memory Seats 049.
Lane Change Alert (LCA)
The vehicle may have LCA. See Lane Change
Alert (LCA) 0280.Folding Mirrors
Manual Folding Mirrors
If equipped, push the mirror toward the
vehicle to fold. Push the mirror outward to
return to its original position.
Manually fold the mirrors inward to prevent
damage when going through an automatic
car wash.
Power Folding Mirrors
If equipped, pressgto power fold the
mirrors. Press again to unfold. Resetting the Power Folding Mirrors
Reset the power folding mirrors if:
.The mirrors are accidentally obstructed
while folding.
.The mirrors are accidentally manually
folded/unfolded.
.The mirrors will not stay in the unfolded
position.
.The mirrors vibrate at normal driving
speeds.
Fold and unfold the mirrors one time using
the mirror controls to reset them to their
normal position. A noise may be heard
during the resetting of the power folding
mirrors. This sound is normal after a manual
folding operation.
Remote Mirror Folding
If equipped, press and holdQon the RKE
transmitter for approximately one second to
remotely fold the exterior mirrors. Press and
hold
Kon the RKE transmitter for
approximately one second to unfold. See
Remote Keyless Entry (RKE) System
Operation (Key Access) 010 or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 013.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Keys, Doors, and Windows 41
The vehicle aerodynamics are designed to
improve fuel economy performance. This
may result in a pulsing sound when either
rear window is down and the front windows
are up. To reduce the sound, open either a
front window or the sunroof, if equipped.
Manual Windows
If equipped, turn the hand crank on each
door to manually raise or lower the manual
windows.
Power Windows
{Warning
Children could be seriously injured or
killed if caught in the path of a closing
window. Never leave the Remote Keyless
Entry (RKE) transmitter or keys in a
vehicle with children. When there are
children in the rear seat, use the window
lockout button to prevent operation of
the windows. SeeKeys (Key Access)07
or
Keys (Keyless Access) 09.
The power windows work when the ignition
is on, in ACC/ACCESSORY, or when Retained
Accessory Power (RAP) is active. See
Retained Accessory Power (RAP) 0236.
Using the window switch, press to open or
pull to close the window.
The windows may be temporarily disabled if
they are used repeatedly within a
short time.
Window Lockout
With Power Folding Mirrors, Without Similar
This feature stops the rear door passenger
window switches from working except from
the driver position.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
50 Seats and Restraints
hold 1, 2, orBuntil the saved position is
reached. Follow the instructions under
“Saving Memory Positions.”
The vehicle identifies the current driver’s RKE
transmitter number (1–8). See Remote
Keyless Entry (RKE) System Operation (Key
Access) 010 or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 013. Only RKE
transmitters 1 and 2 can be used for
automatic memory recalls. A Driver
Information Center (DIC) welcome message
indicating the transmitter number may
display for the first few ignition cycles
following a transmitter change. For Seat
Entry Memory to work properly, save the
positions to the memory button (1 or 2)
matching the RKE transmitter number
displayed in the DIC welcome message.
Carry the linked RKE transmitter when
entering the vehicle.
Vehicle Personalization Settings
.To have the Seat Entry Memory
movement begin when the vehicle is
started, select the Settings menu, then
Vehicle, then Seating Position, and then
Seat Entry Memory. Select On or Off. See
“Seat Entry Memory” later in this section.
.To begin Seat Exit Memory movement
when the vehicle is turned off and the
driver door is opened, or when the vehicle
is turned off with the driver door already
opened, select the Settings menu, then
Vehicle, then Seating Position, and then
Seat Exit Memory. Select On or Off. See
“Seat Exit Memory”later in this section.
.SeeVehicle Personalization 0131 for
additional setting information.
Identifying Driver Number
To identify the driver number: 1. Move your RKE transmitter away from the vehicle.
2. Start the vehicle with another key or RKE transmitter. The DIC should display the
driver number for the other RKE
transmitter. Turn the vehicle off and
remove the key or RKE transmitter from
the vehicle.
3. Start the vehicle with the initial key or RKE transmitter. The DIC should display
the driver number of your RKE
transmitter.
Saving Memory Positions
Read these instructions completely before
saving memory positions. To save preferred driving positions 1 and 2:
1. Turn the vehicle on or to ACC/ ACCESSORY.
A DIC welcome message may indicate
driver number 1 or 2.
2. Adjust all available memory features to the desired driving position.
3. Press and release SET; a beep will sound.
4. Immediately press and hold the 1 or 2 memory button matching the above
DIC welcome message until two beeps
sound.
If too much time passes between
releasing SET and pressing 1, the
memory position will not be saved and
two beeps will not sound. Repeat
Steps 3 and 4.
1 or 2 corresponds to the driver number.
See “Identifying Driver Number”
previously in this section.
5. Repeat Steps 1–4 for a second driver using 1 or 2. RKE transmitters 3–8 will
not save memory positions.
To save the position for
Band Seat Exit
Memory features, repeat Steps 1–4 using
B. This saves the position for getting out
of the vehicle.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Seats and Restraints 51
Save preferred memory feature positions to
both 1 and 2 if you are the only driver.
Manually Recalling Memory Positions
Press and hold 1, 2, or
Bto recall the
previously saved memory positions if you
are driver 1 or 2 identified in the DIC
welcome message.
To stop Manual Memory recall movement,
release 1, 2, or
Bor press any of the
following controls:
.Power seat
.Memory SET
.Power mirror, with the driver or
passenger side mirror selected
Manual Memory recall movement for 1, 2,
or
Bbuttons may be initiated and may
complete to the saved memory position if
the vehicle is in or out of P (Park).
Seat Entry Memory
The vehicle identifies the number of the
current driver’s RKE transmitter (1–8). See
Remote Keyless Entry (RKE) System
Operation (Key Access) 010 or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 013. If the RKE
transmitter is 1 or 2, and Seat Entry Memory
is enabled in vehicle personalization, the positions saved to the same memory button
number 1 or 2 are automatically recalled
when the vehicle is turned on, or turned
from off to ACC/ACCESSORY. RKE
transmitters 3–8 will not provide automatic
memory recalls.
To turn Seat Entry Memory on or off, see
“Vehicle Personalization Settings”
previously
in this section and Vehicle Personalization
0 131.
The shift lever must be in P (Park) to start
Seat Entry Memory. Seat Entry Memory
recall will complete if the vehicle is shifted
out of P (Park) prior to reaching the saved
memory position.
To stop Seat Entry Memory recall
movement, turn the vehicle off or press any
of the following controls:
.Power seat
.Memory SET, 1, 2, orB
.Power mirror, with the driver or
passenger side mirror selected
If the saved memory seat position does not
automatically recall or recalls to the wrong
positions, the driver’s RKE transmitter
number (1 or 2) may not match the memory
button number that positions were saved to. Try storing the position to the other
memory button or try the other RKE
transmitter.
Seat Exit Memory
Seat Exit Memory is not linked to an RKE
transmitter. The position saved to
Bis
used for all drivers. To turn Seat Exit
Memory on or off, see "Vehicle
Personalization Settings" previously in this
section and Vehicle Personalization 0131.
If turned on, the position saved to
Bis
automatically recalled when one of the
following occurs:
.The vehicle is turned off and the driver
door is opened within a short time.
.The vehicle is turned off with the driver
door open.
To stop Seat Exit Memory movement, press
any of the following memory controls:
.Power seat
.Memory SET, 1, 2, orB
.Power mirror, with the driver or
passenger side mirror selected

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Instruments and Controls 115
will light either ON or OFF, or either the on
or off symbol, to let you know the status of
the front outboard passenger frontal airbag.
If the word ON or the on symbol is lit on
the passenger airbag status indicator, it
means that the front outboard passenger
frontal airbag is allowed to inflate.
If the word OFF or the off symbol is lit on
the passenger airbag status indicator, it
means that the passenger sensing system
has turned off the front outboard passenger
frontal airbag.
If, after several seconds, both status
indicator lights remain on, or if there are no
lights at all, there may be a problem with
the lights or the passenger sensing system.
See your dealer for service.
{Warning
If the airbag readiness light ever comes
on and stays on, it means that
something may be wrong with the airbag
system. To help avoid injury to yourself
or others, have the vehicle serviced right
away. SeeAirbag Readiness Light 0114
for more information, including important
safety information.
Charging System Light
The charging system light comes on briefly
when the ignition is turned on, but the
engine is not running, as a check to show
the light is working. It should go out when
the engine is started.
If the light stays on, or comes on while
driving, there may be a problem with the
electrical charging system. Have it checked
by your dealer. Driving while this light is on
could drain the battery.
When this light comes on, or is flashing, the
Driver Information Center (DIC) also displays
a message.
If a short distance must be driven with the
light on, be sure to turn off all accessories,
such as the radio and air conditioner. Find a
safe place to stop the vehicle.
Malfunction Indicator Lamp
(Check Engine Light)
This light is part of the vehicle’s emission
control on-board diagnostic system. If this
light is on while the engine is running, a
malfunction has been detected and the
vehicle may require service. The light should
come on to show that it is working when
the ignition is on and the engine is not
running. See Ignition Positions (Keyless
Access) 0230 or
Ignition Positions (Key Access) 0229.
Malfunctions are often indicated by the
system before any problem is noticeable.
Being aware of the light and seeking service
promptly when it comes on may prevent
damage.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Instruments and Controls 133
Touch the controls on the infotainment
display to adjust the volume.
Reverse Tilt Mirror
When on, the driver, passenger, or both
driver and passenger outside mirrors will tilt
downward when the vehicle is shifted into
R (Reverse) to improve visibility of the
ground near the rear wheels. They may
move from their tilted position when the
vehicle is shifted out of R (Reverse) or
turned off. SeeReverse Tilt Mirrors 038.
Touch Off, On - Driver and Passenger, On -
Driver, or On - Passenger.
Remote Mirror Folding
When on, the outside mirrors will remotely
fold or unfold when the Remote Keyless
Entry (RKE) transmitter
QorKbutton is
pressed and held. See Folding Mirrors036.
Touch Off or On.
Lighting
Touch and the following may display:
.Vehicle Locator Lights
.Exit Lighting
.Automatic High Beam Assist Vehicle Locator Lights
This setting flashes the vehicle’s headlamps
when
Kis pressed on the Remote Keyless
Entry (RKE) transmitter.
Touch Off or On.
Exit Lighting
This setting specifies how long the
headlamps stay on after the vehicle is
turned off and exited.
Touch Off, 30 Seconds, 60 Seconds,
or 120 Seconds.
Automatic High Beam Assist
This setting specifies how the high beams
adjust based on the vehicle environment.
Touch IntelliBeam or Adaptive Headlight
System.
Power Door Locks
Touch and the following may display:
.Open Door Anti Lock Out
.Auto Door Unlock
.Delayed Door Lock Open Door Anti Lock Out
This setting prevents the driver door from
locking when the door is open. If this
setting is on, the Delayed Door Lock menu
will not be available.
Touch Off or On.
Auto Door Unlock
This setting allows selection of which doors
will automatically unlock when the vehicle is
shifted into P (Park).
Touch Off, All Doors, or Driver Door.
Delayed Door Lock
When on, this feature will delay the locking
of the doors. To override the delay, press
the power door lock switch on the door.
Touch Off or On.
Remote Lock, Unlock, and Start
Touch and the following may display:
.Remote Unlock Light Feedback
.Remote Lock Feedback
.Remote Door Unlock
.Remote Start Auto Cool Seats
.Remote Start Auto Heat Seats
.Remote Window Operation

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
134 Instruments and Controls
.Passive Door Unlock
.Passive Door Lock
.Remote Left in Vehicle Alert
.Remote Removed from Vehicle Alert
Remote Unlock Light Feedback
When on, the exterior lamps will flash when
unlocking the vehicle with the RKE
transmitter.
Touch Off or Flash Lights.
Remote Lock Feedback
This allows selection of what type of
feedback is given when locking the vehicle
with the RKE transmitter.
Touch Off, Lights and Horn, Lights Only,
or Horn Only.
Remote Door Unlock
This allows selection of which doors will
unlock when pressing
Kon the RKE
transmitter.
Touch All Doors or Driver Door. Remote Start Auto Cool Seats
If equipped and turned on, this feature will
turn on the ventilated seats when using
remote start on warm days. See
Heated and
Ventilated Front Seats 052 and
Remote Vehicle Start 020.
Touch Off or On.
Remote Start Auto Heat Seats
If equipped and turned on, this feature will
turn on the heated seats when using remote
start on cold days. See Heated and
Ventilated Front Seats 052 and
Remote Vehicle Start 020.
If equipped with Auto Heated Steering
Wheel, this feature will turn on when the
Remote Start Auto Heated Seats turn on.
Touch Off or On.
Remote Window Operation
If equipped, this feature enables remote
operation of the windows with the RKE
transmitter. See Remote Keyless Entry (RKE)
System Operation (Key Access) 010 or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 013.
Touch Off or On. Passive Door Unlock
This allows the selection of what doors will
unlock when using the button on the driver
door to unlock the vehicle.
Touch Off, All Doors or Driver Door Only.
Passive Door Lock
This allows passive locking to be turned on
or off and selects feedback. See
Remote
Keyless Entry (RKE) System Operation (Key
Access) 010 or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 013.
Touch Off, On with Horn Chirp, or On.
Remote Left in Vehicle Alert
This feature sounds an alert when the RKE
transmitter is left in the vehicle. This menu
also enables Remote No Longer In Vehicle
Alert.
Touch Off or On.
Remote Removed from Vehicle Alert
This feature beeps the horn 3 times when
exiting a running vehicle with the
remote key.
Touch Off or On.