2018 GMC YUKON XL door lock

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Keys, Doors, and Windows 43This can be manually overridden by
pressing and holding
Q on the
power door lock switch.
Keyless Access : When locking is
requested with the driver door open
and the vehicle is on or in ACC/
ACCESSORY, all the doors will lock
and then 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 for RKE
transmitters inside. 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 sound three
times.
This can be manually overridden by
pressing and holding
Q on the
power door lock switch.
Unlocked Door Anti-Lockout
If Unlocked 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 remain open.
Press the button again to lock the driver door. The Unlocked Door
Anti-Lockout feature can be turned
on or off. See Vehicle
Personalization 0 158 .
Safety Locks The rear door safety locks prevent
passengers from opening the rear
doors from inside the vehicle.
Press
{ to activate the safety locks
on the rear doors. The indicator light
comes on when activated.
Press
{ again to deactivate the
safety locks. Doors Liftgate
{ WarningExhaust gases can enter the
vehicle if it is driven with the
liftgate or trunk/hatch open,
or with any objects that pass
through the seal between the
body and the trunk/hatch or
liftgate. Engine exhaust contains
carbon monoxide (CO) which
cannot be seen or smelled. It can
cause unconsciousness and even
death.
If the vehicle must be driven with
the liftgate or trunk/hatch open:
.
Close all of the windows.
.
Fully open the air outlets on
or under the instrument
panel.
.
Adjust the climate control
system to a setting that
brings in only outside air
(Continued)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
44 Keys, Doors, and Windows Warning (Continued) and set the fan speed to the
highest setting. See
“ Climate Control Systems ”
in the Index.
.
If the vehicle is equipped
with a power liftgate, disable
the power liftgate function.
See Engine Exhaust 0 215 .
CautionTo avoid damage to the liftgate or
liftgate glass, make sure the area
above and behind the liftgate is
clear before opening it. Manual Liftgate
To open the liftgate, press
K on the
power door lock switch or press
Kon the RKE transmitter twice to
unlock all doors. Press the touch
pad (1) on the underside of the
liftgate handle and lift up.
Press the button (2) above the
license plate to open the liftglass,
or press
c twice quickly on the
RKE transmitter. Do not leave the
liftglass open when raising the
liftgate. There will be a delay in the release
of the liftglass if there is an attempt
to open it while the rear wiper is in
motion.
Use the pull cup to lower and close
the liftgate. Do not press the touch
pad while closing the liftgate. This
will cause the liftgate to be
unlatched.
If equipped with Keyless Access,
the RKE transmitter must be within
1 m (3 ft) of the liftgate to
automatically unlock it.
See Remote Keyless Entry (RKE)
System Operation (Key Access)
0 31 or Remote Keyless Entry
(RKE) System Operation (Keyless
Access) 0 33 .
The liftgate has an electric latch.
If the battery is disconnected or has
low voltage, the liftgate will not
open. The liftgate will resume
operation when the battery is
reconnected and charged.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Keys, Doors, and Windows 45Power Liftgate Operation
{ WarningYou or others could be injured if
caught in the path of the power
liftgate. Make sure there is no one
in the way of the liftgate as it is
opening and closing.
CautionDriving with an open and
unsecured liftgate may result in
damage to the power liftgate
components. If equipped, the switch is on the
overhead console. The vehicle must
be in P (Park).
The modes are:
MAX : Opens to maximum height.
3/4 : Opens to a reduced height that
can be set from 3/4 to fully open.
Use to prevent the liftgate from
opening into overhead objects such
as a garage door or roof-mounted
cargo. The liftgate can be opened
all the way manually.
OFF : Opens manually only. To open or close the liftgate, select
MAX or 3/4 mode and then:
.
Press
b twice quickly on the
RKE transmitter until the liftgate
moves.
.
Press
8 on the overhead
console. The driver door must
be unlocked.
.
Press the touch pad on the
underside of the liftgate handle
after unlocking all doors.
If equipped with Keyless Access,
a locked vehicle can be opened
if the RKE transmitter is within
1 m (3 ft) of the touch pad.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
46 Keys, Doors, and Windows .
Press
l on the bottom edge of
the liftgate next to the latch to
close.
Press any liftgate button, the touch
pad, or
b on the RKE transmitter
while the liftgate is moving to stop it.
Pressing any liftgate button or
pressing
b twice quickly on the
RKE transmitter restarts the
operation in the reverse direction.
Pressing the touch pad on the
liftgate handle will restart the
motion, but only in the opening
direction.
CautionManually forcing the liftgate to
open or close during a power
cycle can damage the vehicle.
Allow the power cycle to
complete.
The power liftgate may be
temporarily disabled in extremely
low temperatures, or after repeated
power cycling over a short period of time. If this occurs, the liftgate can
still be operated manually. Select
OFF on the liftgate switch.
If the vehicle is shifted out of
P (Park) while the power function is
in progress, the liftgate will continue
to completion. If the vehicle is
accelerated before the liftgate has
completed moving, the liftgate may
stop or reverse direction. Check for
Driver Information Center (DIC)
messages and make sure the
liftgate is closed and latched before
driving.
Falling Liftgate Detection
If the power liftgate automatically
closes after a power opening cycle,
it indicates that the system is
reacting to excess weight on the
liftgate or a possible support strut
failure. Remove any excess weight.
If the liftgate continues to
automatically close after opening,
see your dealer for service before
using the power liftgate.
Interfering with the power liftgate
motion or manually closing the
liftgate too quickly after power
opening may resemble a support strut failure. This could also activate
the falling liftgate detection feature.
Allow the liftgate to complete its
operation and wait a few seconds
before manually closing the liftgate.
Obstacle Detection Features If the liftgate encounters an obstacle
during a power open or close cycle,
the liftgate will automatically reverse
direction and move a short distance
away from the obstacle. After
removing the obstruction, the power
liftgate operation can be used again.
If the liftgate encounters multiple
obstacles on the same power cycle,
the power function will deactivate.
After removing the obstructions,
manually close the liftgate. This will
allow normal power operation
functions to resume.
If the vehicle is locked while the
liftgate is closing, and an obstacle
prevents the liftgate from completely
closing, the horn will sound as an
alert that the liftgate did not close.
Pinch sensors are on the side
edges of the liftgate. If an object is
caught between the liftgate and the
vehicle and presses against a

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Keys, Doors, and Windows 49power assist steps, clear the ice,
then enable the assist steps and
confirm normal function prior to use.
Keep hands, children, pets, objects,
and clothing clear of the power
assist steps when in motion. The
steps will reverse direction if they
encounter an obstruction when
opening or closing. Remove the
obstruction, then open and close the
door on the same side to complete
the motion of the assist steps. If the
obstruction is not cleared, the assist
steps remain extended while driving. To extend both power assist steps
for cleaning, press
j while the
vehicle is in P (Park) or N (Neutral).
Press
j again to retract them.
The DIC will display a message.
Enable/Disable
Press and hold
j for four seconds
to lock and disable the power assist
steps. Press and hold
j for
four seconds again to enable them.
The DIC will display a message.
Vehicle Security This vehicle has theft-deterrent
features; however, they do not make
the vehicle impossible to steal.
Vehicle Alarm System
The indicator light, on the
instrument panel near the
windshield, indicates the status of
the system.
Off : Alarm system is disarmed.
On Solid : Vehicle is secured
during the delay to arm the system.
Fast Flash : Vehicle is unsecured.
A door, liftgate, or the hood is open.
Slow Flash : Alarm system is
armed.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
50 Keys, Doors, and Windows Arming the Alarm System 1. Turn off the vehicle.
2. Lock the vehicle in one of
three ways:
.
Use the RKE transmitter.
.
Use the Keyless Access
system.
.
With a door open, press
Qon the interior of the door.
3. After 30 seconds the alarm
system will arm, and the
indicator light will begin to
slowly flash. Pressing
Q on the
RKE transmitter a second time
will bypass the 30-second
delay and immediately arm the
alarm system.
The vehicle alarm system will not
arm if the doors are locked with
the key.
If the driver door is opened without
first unlocking with the RKE
transmitter, the horn will chirp and
the lights will flash to indicate
pre-alarm. If the vehicle is not
started, or the door is not unlocked by pressing
K on the RKE
transmitter during the 10-second
pre-alarm, the alarm will be
activated.
The alarm will also be activated if a
passenger door, the liftgate, or the
hood is opened without first
disarming the system. When the
alarm is activated, the turn signals
flash and the horn sounds for about
30 seconds. The alarm system will
then re-arm to monitor for the next
unauthorized event.
Disarming the Alarm System To disarm the alarm system or turn
off the alarm if it has been activated:
.
Press
K on the RKE transmitter.
.
Unlock the vehicle using the
Keyless Access system.
.
Start the vehicle.
To avoid setting off the alarm by
accident:
.
Lock the vehicle after all
occupants have exited. .
Always unlock a door with the
RKE transmitter, or use the
Keyless Access system.
Unlocking the driver door with
the key will not disarm the
system or turn off the alarm.
How to Detect a Tamper
Condition If
K is pressed on the RKE
transmitter and the horn chirps three
times, an alarm occurred previously
while the alarm system was armed.
If the alarm has been activated, a
message will appear on the DIC.
Power Sounder, Inclination
Sensor, and Intrusion Sensor In addition to the standard
theft-deterrent system features, this
system may also have a power
sounder, inclination sensor, and
intrusion sensor.
The power sounder provides an
audible alarm which is distinct from
the vehicle ’ s horn. It has its own
power source, and can sound an
alarm if the vehicle ’ s battery is
compromised.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Keys, Doors, and Windows 51The inclination sensor can set off
the alarm if it senses movement of
the vehicle, such as a change in
vehicle orientation.
The intrusion sensor monitors the
vehicle interior, and can activate the
alarm if it senses unauthorized entry
into the vehicle ’ s interior. Do not
allow passengers or pets to remain
in the vehicle when the intrusion
sensor is activated.
Before arming the theft-deterrent
system and activating the intrusion
sensor:
.
Make sure all doors and
windows are completely closed.
.
Secure any loose items such as
a sunshades.
.
Make sure there are no
obstructions blocking the
sensors in the front overhead
console.
.
Close DVD screens before
leaving the vehicle. Intrusion and Inclination
Sensors Disable Switch
It is recommended that the intrusion
and inclination sensors be
deactivated if pets are left in the
vehicle or the vehicle is being
transported.
With the vehicle off, press
o in
the front overhead console to turn
off the feature.
The indicator light will come on
momentarily, indicating that these
sensors have been disabled until
the next time the alarm system is
armed. Immobilizer See Radio Frequency Statement
0 396 .
Immobilizer Operation
This vehicle has a passive
theft-deterrent system.
The system does not have to be
manually armed or disarmed.
The vehicle is automatically
immobilized when the vehicle is
turned off.
The system is automatically
disarmed when the ignition is turned
from off to on.
The security light, in the instrument
cluster, comes on if there is a
problem with arming or disarming
the theft-deterrent system.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
56 Keys, Doors, and Windows
Automatic Dimming
Rearview Mirror If equipped, automatic dimming
reduces the glare of headlamps
from behind. The dimming feature
comes on when the vehicle is
started.
Child-View Mirror
If equipped, the child-view mirror is
on the overhead console. Press the
fixed button on the cover to release.
Push the mirror back up when not
in use. Windows
{ WarningNever leave a child, a helpless
adult, or a pet alone in a vehicle,
especially with the windows
closed in warm or hot weather.
They can be overcome by the
extreme heat and suffer
permanent injuries or even death
from heat stroke.
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.
Power Windows
{ WarningChildren 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.
See Keys (Keyless Access) 0 27
or Keys (Key Access) 0 28 .