Locks GMC SIERRA DENALI 2020 Owners Manual

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
Keys, Doors, and Windows 9
Keys, Doors, and
Windows
Keys and Locks
Keys (Key Access) . . . . . . . . . . . . . . 9
Keys (Keyless Access) . . . . . . . . 12
Remote Keyless Entry (RKE)System . . . . . . . . . . . . . . . . . . . . . . . 13
Remote Keyless Entry (RKE) System Operation (Key
Access) . . . . . . . . . . . . . . . . . . . . . . 13
Remote Keyless Entry (RKE) System Operation (Keyless
Access) . . . . . . . . . . . . . . . . . . . . . . 16
Remote Vehicle Start . . . . . . . . . . 25
Door Locks . . . . . . . . . . . . . . . . . . . . 26
Power Door Locks . . . . . . . . . . . . . 27
Delayed Locking . . . . . . . . . . . . . . . 27
Automatic Door Locks . . . . . . . . . 27
Lockout Protection . . . . . . . . . . . . . 28
Safety Locks . . . . . . . . . . . . . . . . . . . 28
Doors
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . 29
Power Assist Steps . . . . . . . . . . . . 34
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . 36
Vehicle Alarm System . . . . . . . . . 36 Steering Column Lock . . . . . . . . . 37
Immobilizer . . . . . . . . . . . . . . . . . . . . 37
Immobilizer Operation . . . . . . . . . 37
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . 39
Manual Mirrors . . . . . . . . . . . . . . . . . 39
Trailer-Tow Mirrors . . . . . . . . . . . . . 40
Power Mirrors . . . . . . . . . . . . . . . . . . 41
Folding Mirrors . . . . . . . . . . . . . . . . . 42
Heated Mirrors . . . . . . . . . . . . . . . . . 43
Automatic Dimming Mirror . . . . . 43
Blind Spot Mirrors . . . . . . . . . . . . . . 43
Reverse Tilt Mirrors . . . . . . . . . . . . 44
Interior Mirrors
Interior Rearview Mirrors . . . . . . . 44
Manual Rearview Mirror . . . . . . . . 44
Automatic Dimming Rearview
Mirror . . . . . . . . . . . . . . . . . . . . . . . . . 44
Rear Camera Mirror . . . . . . . . . . . . 45
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . 47
Manual Windows . . . . . . . . . . . . . . 47
Power Windows . . . . . . . . . . . . . . . 47
Rear Windows . . . . . . . . . . . . . . . . . 49
Sun Visors . . . . . . . . . . . . . . . . . . . . . 50
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . 50
Keys and Locks
Keys (Key Access)
{Warning
Leaving children in a vehicle with
the ignition key is dangerous and
children or others could be
seriously injured or killed. They
could operate the power windows
or other controls or make the
vehicle move. The windows will
function with the keys in the
ignition, and children or others
could be caught in the path of a
closing window. Do not leave
children in a vehicle with the
ignition key.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
Keys, Doors, and Windows 11
Interference from radio-frequency
identification (RFID) tags may
prevent the key from starting the
vehicle. Keep RFID tags away from
the key when starting the vehicle.
The key is used for the ignition, all
door locks, and the glove box.
If equipped with memory seats,
keys 1 and 2 are linked to seating
positions of memory 1 or 2. See
Memory Seats058.
Programming Keys
Follow these procedures to program
up to eight keys to the vehicle. Programming with Two
Recognized Keys
To program a new key:
1. Insert the original, already programmed key in the ignition
and turn the ignition on.
2. Turn the ignition off, and remove the key.
3. Quickly, within five seconds, insert the second original
already programmed key in the
ignition and turn the ignition on.
4. Turn the ignition off, and remove the key.
5. Insert the key to be programmed and turn the
ignition on within five seconds.
6. After a few seconds, the security light will turn off once
the key has been programmed.
7. Repeat Steps 1–5 if additional keys are to be programmed.
If a key is lost or damaged, see your
dealer to have a new key made. Programming without
Recognized Keys
Program a new key to the vehicle
when a recognized key is not
available. Canadian regulations
require that owners see their dealer.
If two currently recognized keys are
not available, follow this procedure
to program the first key.
This procedure will take
approximately 30 minutes to
complete for the first key. The
vehicle must be off and all of the
keys you wish to program must be
with you.
1. Insert the new vehicle key into the ignition.
2. Turn the ignition on. The security light will come on.
3. Wait 10 minutes until the security light turns off.
4. Turn the ignition off.
5. Repeat Steps 2–4 two more times. After the third time, turn
the ignition on; the key is

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
12 Keys, Doors, and Windows
learned and all previously
known keys will no longer work
with the vehicle.
6. To learn a second key, turn the ignition off, insert the second
key to be learned, and turn the
ignition on.
After two keys are learned, the
remaining keys can be learned by
following the procedure in
“Programming with Two
Recognized Keys.”
The key has a bar-coded key tag
that the dealer or qualified locksmith
can use to make new keys. Store
this information in a safe place, not
in the vehicle.
See your dealer if a replacement
key or additional key is needed.
If it becomes difficult to turn a key,
inspect the key blade for debris.
Periodically clean with a brush
or pick.
If locked out of the vehicle, see
Roadside Assistance Program
0 466. With an active OnStar or connected
service plan, an OnStar Advisor
may remotely unlock the vehicle.
See
OnStar Overview 0476.
Keys (Keyless Access)
{Warning
Leaving children in a vehicle with
an ignition key or Remote
Keyless Entry (RKE) transmitter is
dangerous and children or others
could be seriously injured or
killed. They could operate the
power window or other controls or
make the vehicle move. The
windows will function with the key
in the ignition or with the RKE
transmitter in the vehicle, and
children or others could be caught
in the path of a closing window.
Do not leave children in a vehicle
with the ignition key or an RKE
transmitter.
If the vehicle has the Keyless
Access system, the transmitter has
a button on the side of the
transmitter used to remove the key.
This key is used for the driver door
and glove box.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
16 Keys, Doors, and Windows
2. Press and slide the batterydown toward the pocket of the
transmitter in the direction of
the key ring. Do not use a
metal object
3. Remove the battery.
4. Insert the new battery, positive side facing up. Replace with a
CR2032 or equivalent battery.
5. Push together the transmitter back cover top side first, and
then the bottom toward the
key ring.
Remote Keyless Entry
(RKE) System Operation
(Keyless Access)
The Keyless Access system allows
for vehicle entry when the
transmitter is within 1 m (3 ft). See
“Keyless Access Operation” later in
this section.
The RKE transmitter functions may
work up to 60 m (197 ft) away from
the vehicle.
Other conditions can affect the
performance of the transmitter. See
Remote Keyless Entry (RKE)
System 013.
The key that is part of the RKE
transmitter can be used for all locks.
Remove the key by pressing the
button on the side of the RKE
transmitter near the bottom and pull
the key out. Never pull the key out
without pressing the button.
See your dealer if a new transmitter
is needed.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
20 Keys, Doors, and Windows
times after all doors are closed. To
turn on or off seeVehicle
Personalization 0156.
Remote No Longer in Vehicle Alert
If the vehicle is on with a door open
and then all doors are closed, the
vehicle will check for RKE
transmitters inside. If an RKE
transmitter is not detected, the
Driver Information Center (DIC) will
display NO REMOTE DETECTED
and the horn will chirp three times.
This occurs only once each time the
vehicle is driven. To turn on or off
see Vehicle Personalization 0156.
Key Access
To access a vehicle with a dead
transmitter battery, see Door Locks
0 26.
Programming Transmitters to
the Vehicle
Only RKE transmitters programmed
to the vehicle will work. If a
transmitter is lost or stolen, a
replacement can be purchased and
programmed through your dealer.
The vehicle can be reprogrammed so that lost or stolen transmitters no
longer work. Each vehicle can have
up to eight transmitters matched
to it.
Programming with Recognized
Transmitters
A new transmitter can be
programmed to the vehicle when
there are two recognized
transmitters.
To program, the vehicle must be off
and all transmitters, both currently
recognized and new, must be
with you.
1. Remove the key from a recognized transmitter.
2. Place the two recognized transmitters in the cupholder or
on the passenger seat.
3. Insert the vehicle key into the key lock cylinder on the driver
door handle. Then turn the key
counterclockwise, to the unlock
position, five times within
10 seconds.
The DIC displays READY FOR
REMOTE#3, 4, 5 ETC.
Transmitter Pocket without Bucket
Seats (Lower Compartment)

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
26 Keys, Doors, and Windows
The engine will continue to run
for 15 minutes. After
30 seconds, repeat
Steps 1 and 2 for a 15-minute
time extension.
Turn the ignition on to operate the
vehicle.
Extending Engine Run Time
The engine run time can be
extended by 15 minutes, for a total
of 30 minutes, if during the first
15 minutes Steps 1 and 2 are
repeated while the engine is still
running. An extension can be
requested 30 seconds after starting.
A maximum of two remote starts,
or a single start with an extension,
is allowed between ignition cycles.
The vehicle's ignition must be
turned on and then back off to use
remote start again.
Canceling a Remote Start
To cancel a remote start, do one of
the following:
. Press and hold
/until the
parking lamps turn off. .
Turn on the hazard warning
flashers.
. Turn the ignition on and then off.
Door Locks
{Warning
Unlocked doors can be
dangerous.
. Passengers, especially
children, can easily open
the doors and fall out of a
moving vehicle. The doors
can be unlocked and
opened while the vehicle is
moving. The chance of
being thrown out of the
vehicle in a crash is
increased if the doors are
not locked. So, all
passengers should wear
seat belts properly and the
doors should be locked
whenever the vehicle is
driven.
(Continued)
Warning (Continued)
.Young children who get into
unlocked vehicles may be
unable to get out. A child
can be overcome by
extreme heat and can suffer
permanent injuries or even
death from heat stroke.
Always lock the vehicle
whenever leaving it.
. Outsiders can easily enter
through an unlocked door
when you slow down or stop
the vehicle. Locking the
doors can help prevent this
from happening.
There are several ways to lock and
unlock the vehicle.
From outside:
. Use the Remote Keyless Entry
(RKE) transmitter.
. Use Keyless Access,
if equipped.
. Use the key in the driver door or
the passenger door, if equipped.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
Keys, Doors, and Windows 27
From inside, use the power door
locks or the manual door locks. To
lock the door with the manual door
locks, push down on the manual
lock knob.
From inside, pull the door handle
once to unlock the door. Pull the
handle again to open the door.
SeeVehicle Alarm System 036.
Free-Turning Locks
The door key lock cylinder turns
freely when either the wrong key is
used, or the correct key is not fully
inserted. The free-turning door lock
feature prevents the lock from being
forced open. To reset the lock, turn
it to the vertical position with the
correct key fully inserted. Remove
the key and insert it again. If this
does not reset the lock, turn the key
halfway around in the cylinder and
repeat the reset procedure.Power Door Locks
If equipped with power door locks.
Q: Press to lock the doors.
K:Press to unlock the doors.
Delayed Locking
If equipped, this feature delays the
locking of the doors until
five seconds after all doors are
closed.
Delayed locking can only be turned
on when the Open Door
Anti-Lockout feature has been
turned off. When
Qis pressed on the power
door lock switch while the door is
open, a chime will sound three
times indicating delayed locking is
active.
The doors will lock automatically
five seconds after all doors are
closed. If a door is reopened before
that time, the five-second timer will
reset when all doors are closed
again.
Press
Qon the door lock switch
again or press
Qon the RKE
transmitter to lock the doors
immediately.
This feature can be programmed.
See Vehicle Personalization 0156.
Automatic Door Locks
If equipped, the doors will lock
automatically when all doors are
closed, the ignition is on, and the
vehicle is shifted out of P (Park).
If a vehicle door is unlocked, and
then opened and closed, the doors
will lock either when your foot is

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
28 Keys, Doors, and Windows
removed from the brake or the
vehicle speed becomes faster than
13 km/h (8 mph).
To unlock the doors:
.Press
Kon the power door lock
switch.
. Shift the transmission into
P (Park).
Automatic door locking cannot be
disabled. Automatic door unlocking
can be programmed. See Vehicle
Personalization 0156.
Lockout Protection
If equipped, the ignition is on or in
ACC/ACCESSORY and the power
door lock switch is pressed with the
driver door open, all the doors will
lock and only the driver door will
unlock.
If the vehicle is off and locking is
requested while a door is open,
when all doors are closed the
vehicle will check to the Keyless
Access function (if equipped). If an
RKE transmitter is detected and the
number of RKE transmitters inside has not reduced, the driver door will
unlock and the horn will chirp three
times.
Lockout Protection can be manually
overridden with the driver door open
by pressing and holding
Qon the
power door lock switch.
Open Door Anti-Lockout
If equipped, the Open Door
Anti-Lockout is turned on and the
vehicle is off, the driver door is
open, and locking is requested, all
the doors will lock and the driver
door will unlock. The Open Door
Anti-Lockout feature can be turned
on or off. See Vehicle
Personalization 0156.
Safety Locks
The rear door safety locks prevent
passengers from opening the rear
doors from inside the vehicle.
The safety lock is on the inside
edge of the rear doors. To use the
safety lock:
1. Move the lever down to the lock position.
2. Close the door.
3. Do the same for the other rear door.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
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Keys, Doors, and Windows 29
To open a rear door when the safety
lock is on:1. Unlock the door by activating the inside handle, by pressing
the power door unlock switch,
or by using the Remote
Keyless Entry (RKE)
transmitter.
2. Open the door from the outside.
When the safety lock is enabled,
adults and older children will not be
able to open the rear door from the
inside. Cancel the safety locks to
enable the doors to open from the
inside.
To cancel the safety lock: 1. Unlock the door and open it from the outside.
2. Move the lever up to unlock. Do the same for the other door.Doors
Tailgate
Manual Tailgate
{Warning
It is extremely dangerous to ride
on the tailgate, even when the
vehicle is operated at low speeds.
People riding on the tailgate can
easily lose their balance and fall
in response to vehicle
maneuvers. Falling from a moving
vehicle may result in serious
injuries or death. Do not allow
people to ride on the tailgate. Be
sure everyone in your vehicle is in
a seat and using a seat belt
properly.
Use the key to unlock the tailgate.
Open the tailgate by lifting up on its
handle while pulling the
tailgate down.
To shut the tailgate, firmly push it
upward until it latches. After closing the tailgate, pull it back
to be sure it is latched securely.
Some tailgates have an electric
latch. If the battery is disconnected
or has low voltage, the tailgate will
not open. The tailgate will resume
operation when the battery is
reconnected or recharged.Power Release Tailgate
{Warning
Make sure there is no one in the
way of the power tailgate as it is
opening and closing, and keep
hands away from the tailgate
hinges when in use. You or others
could be injured if caught in the
path of the power tailgate or
tailgate hinges.
Caution
To avoid damage to the tailgate,
make sure the area behind the
tailgate is clear before opening it.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
Keys, Doors, and Windows 33
.To lower the tailgate step, press
the button at the center of the
step. Make sure it lowers to the
fully open position.
. To close the tailgate step, lift it
firmly. Make sure that both side
latches are engaged.Do not place a load on top of the
step when using it as a load stop.
Using the Assist Handle
The assist handle helps with
entering the pickup box. To use:
1. Lift up on the handle until it locks in the open position.
2. To return the assist handle, pull the release lever toward the
ball end of the handle and push
the handle back to the closed
position.
Applying Loads to Tailgates
Caution
Do not put ramp loads on the
inner tailgate alone. Damage to
the inner tailgate may occur.