2021 CADILLAC XT6 ECU

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
6 KEYS, DOORS, AND WINDOWS
Keys, Doors, and
Windows
Keys and Locks
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Remote Keyless Entry (RKE)System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Remote Keyless Entry (RKE) System Operation . . . . . . . . . . . . . . . . . 7
Remote Vehicle Start . . . . . . . . . . . . . . 14
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power Door Locks . . . . . . . . . . . . . . . . . 18
Delayed Locking . . . . . . . . . . . . . . . . . . . 18
Automatic Door Locks . . . . . . . . . . . . 18
Lockout Protection . . . . . . . . . . . . . . . . 18
Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . 19
Doors
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . . . . . 27
Vehicle Alarm System . . . . . . . . . . . . . 27
Steering Column Lock . . . . . . . . . . . . . 28
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . 29
Immobilizer Operation . . . . . . . . . . . . 29
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . . . . . 30
Power Mirrors . . . . . . . . . . . . . . . . . . . . . . 30
Folding Mirrors . . . . . . . . . . . . . . . . . . . . 31
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . 31
Automatic Dimming Mirror . . . . . . . 32
Reverse Tilt Mirrors . . . . . . . . . . . . . . . 32
Interior Mirrors
Interior Rearview Mirrors . . . . . . . . . 32
Automatic Dimming Rearview Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Rear Camera Mirror . . . . . . . . . . . . . . . 32
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Power Windows . . . . . . . . . . . . . . . . . . . . 35
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Keys and Locks
Keys
{Warning
Leaving children in a vehicle with a
Remote Keyless Entry (RKE)
transmitter 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 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 an RKE
transmitter.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
18 KEYS, DOORS, AND WINDOWS
5. Check that the cap is secure.
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
Q: Press to lock the doors.
K:Press to unlock the doors.
Delayed Locking
This feature delays the locking of the
doors until five seconds after all doors
are closed, and only when the vehicle
is off.
Delayed locking can only be turned on
when Open Door Anti-Lockout 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 also be programmed.
See Vehicle Personalization 0130.
Automatic Door Locks
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 removed from
the brake or the vehicle speed
becomes faster than 13 km/h (8 mph).
To unlock the doors:
.PressKon 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 0130.
Lockout Protection
If 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.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
20 KEYS, DOORS, AND WINDOWS
Doors
Liftgate
{Warning
Exhaust 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 and set the fan
speed to the highest setting. See
“Climate Control Systems”in the
Index.
(Continued)
Warning (Continued)
.If the vehicle is equipped with a
power liftgate, disable the power
liftgate function.
See Engine Exhaust 0239.
Caution
To avoid damage to the liftgate or
liftgate glass, make sure the area
above and behind the liftgate is
clear before opening it.
Power Liftgate Operation
{Warning
You 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.
Caution
Driving with an open and
unsecured liftgate may result in
damage to the power liftgate
components.
The power liftgate switch is on the
driver door. The vehicle must be in
P (Park).

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
KEYS, DOORS, AND WINDOWS 21
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 obstructions such as a
garage door or roof-mounted cargo.
The liftgate can be manually opened
all the way.
OFF : Opens manually only.
To power open or close the liftgate,
select MAX or 3/4 mode.
.Pressbtwice quickly on the RKE
transmitter until the liftgate moves.
.Press8on the driver door. The
driver door must either be unlocked
or locked without the security
armed.
.Press the touch pad on the
underside of the liftgate handle
after unlocking all doors. A locked
vehicle can be opened if the RKE
transmitter is within 1 m (3 ft) of
the touch pad.
.Presslon the bottom of the
liftgate to close.
Press any liftgate button, the touch
pad, or
bon the RKE transmitter
while the liftgate is moving to stop it.
Pressing any liftgate button or
pressing
btwice quickly on the RKE
transmitter again 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.
Caution
Manually 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 under extreme low
temperatures, or after repeated power
cycling over a short period of time.
If this occurs, the liftgate can still be
operated manually.
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.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
KEYS, DOORS, AND WINDOWS 27
Vehicle Security
This vehicle has theft-deterrent
features; however, they do not make
the vehicle impossible to steal.
Vehicle Alarm System
This vehicle has an anti-theft 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, the hood, or the liftgate
is open.
Slow Flash : Alarm system is armed.
Arming the Alarm System
1. Close the liftgate and the hood.
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 the
inside
Q.
3. After 30 seconds the alarm system will arm, and the indicator light
will begin to slowly flash indicating
the alarm system is operating.
Pressing
Qon 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
Kon 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:
.PressKon 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 left the vehicle and all doors
are closed.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
28 KEYS, DOORS, AND WINDOWS
.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
IfKis pressed and the horn chirps
and the lights flash three times, the
alarm was activated while the alarm
system was armed.
If the alarm system 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 an inclination
sensor, an intrusion sensor, and power
sounder. The power sounder provides an
audible alarm that is different from
the vehicle’s horn. It has its own
power source, and can sound an alarm
when the vehicle’s battery is
compromised.
The 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 set off the
alarm if it senses an 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.
Inclination and Intrusion
Sensors Disable Switch
It is recommended that the inclination
and intrusion sensors be deactivated if
pets are left in the vehicle or if the
vehicle is being transported.
With the vehicle turned off, press
o
in the overhead console. The indicator
light will come on momentarily,
indicating that the sensor has been
disabled until the next time the alarm
system is armed.
Steering Column Lock
If equipped, the steering column lock
is a theft-deterrent device. This
feature locks the steering column
when the vehicle is turned off and the
driver door is opened, or when the
driver door is opened and then the
vehicle is turned off. The steering
column unlocks when the vehicle is
turned on.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
KEYS, DOORS, AND WINDOWS 29
The Driver Information Center (DIC)
may display one of these messages:
.A message to service the steering
column lock indicates that an issue
has been detected with the column
lock feature and the vehicle should
be serviced.
.A message that the steering column
is locked indicates that the engine
is running, but the steering column
is still locked. It is normal for the
column to be locked during a
remote start, but the column should
unlock after the brake pedal is
pressed and the vehicle is started.
No message will display during a
remote start.
.A message that the steering wheel
must be turned and the vehicle
must be started again indicates that
the column lock mechanism is
bound, the column locking device
was unable to unlock the steering
column, and the vehicle did not
start. If this happens, immediately
turn the steering wheel from side to
side to unbind the column lock.
If this does not unlock the steering
column, turn the vehicle off and
open the driver door to reset thesystem. Then turn the vehicle on
and immediately turn the steering
wheel side to side for about
15 seconds. In some cases, it may
take significant force to unbind the
column.
To keep the steering column from
binding, straighten the front wheels
before turning off the vehicle.
Immobilizer
See Radio Frequency Statement 0406.
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 immobilization system is
disarmed when the ignition is on or in
ACC/ACCESSORY and a valid
transmitter is present in the vehicle.
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

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
SEATS AND RESTRAINTS 39
Seats and Restraints
Head Restraints
Head Restraints . . . . . . . . . . . . . . . . . . . . 40
Front Seats
Power Seat Adjustment . . . . . . . . . . . 41
Lumbar Adjustment . . . . . . . . . . . . . . . 42
Reclining Seatbacks . . . . . . . . . . . . . . . 42
Memory Seats . . . . . . . . . . . . . . . . . . . . . . 43
Heated and Ventilated FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Rear Seats
Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Heated Rear Seats . . . . . . . . . . . . . . . . . 50
Third Row Seats . . . . . . . . . . . . . . . . . . . 50
Seat Belts
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
How to Wear Seat BeltsProperly . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . 56
Seat Belt Use During
Pregnancy . . . . . . . . . . . . . . . . . . . . . . . . . 59
Seat Belt Extender . . . . . . . . . . . . . . . . . 59
Safety System Check . . . . . . . . . . . . . . 60
Seat Belt Care . . . . . . . . . . . . . . . . . . . . . . 60
Replacing Seat Belt System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . 60
Airbag System
Airbag System . . . . . . . . . . . . . . . . . . . . . 61
Where Are the Airbags? . . . . . . . . . . . 62
When Should an AirbagInflate? . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
What Makes an Airbag Inflate? . . . 65
How Does an Airbag Restrain? . . . 65
What Will You See after an Airbag
Inflates? . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Passenger Sensing System . . . . . . . . 66
Servicing the Airbag-Equipped Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Adding Equipment to the Airbag-Equipped Vehicle . . . . . . . . 71
Airbag System Check . . . . . . . . . . . . . . 71
Replacing Airbag System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . 72
Child Restraints
Older Children . . . . . . . . . . . . . . . . . . . . . 72
Infants and Young Children . . . . . . 73
Child Restraint Systems . . . . . . . . . . . 76
Where to Put the Restraint . . . . . . . 77
Lower Anchors and Tethers forChildren (LATCH System) . . . . . . . 79
Replacing LATCH System Parts After a Crash . . . . . . . . . . . . . . . . . . . . . 87
Securing Child Restraints (With the Seat Belt in the
Rear Seat) . . . . . . . . . . . . . . . . . . . . . . . . 87 Securing Child Restraints (With
the Seat Belt in the
Front Seat) . . . . . . . . . . . . . . . . . . . . . . . 89