key CADILLAC CT4 2021 Owner's Manual

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Keys, Doors, and Windows . . . . . . . . . . 6
Seats and Restraints . . . . . . . . . . . . . . . 30
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Instruments and Controls . . . . . . . . . . 81
Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Infotainment System . . . . . . . . . . . . . 134
Climate Controls . . . . . . . . . . . . . . . . . . 196
Driving and Operating . . . . . . . . . . . . 202
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . 304
Service and Maintenance . . . . . . . . . 379
Technical Data . . . . . . . . . . . . . . . . . . . . 395
Customer Information . . . . . . . . . . . . 399
Reporting Safety Defects . . . . . . . . . 409
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Connected Services . . . . . . . . . . . . . . . 418
Index . . . . . . . . . . . . . . . . . . . . . . . . 421
Introduction
The names, logos, emblems, slogans,
vehicle model names, and vehicle
body designs appearing in this manual
including, but not limited to, GM, the
GM logo, the CADILLAC Emblem, and
CADILLAC CT4 are trademarks and/or
service marks of General Motors LLC,
its subsidiaries, affiliates, or licensors.
For vehicles first sold in Canada,
substitute the name“General Motors
of Canada Company ”for Cadillac
Motor Car Division wherever it
appears in this manual.
This manual describes features that
may or may not be on the vehicle
because of optional equipment that
was not purchased on the vehicle,
model variants, country specifications, features/applications that may not be
available in your region, or changes
subsequent to the printing of this
owner’s manual.
Refer to the purchase documentation
relating to your specific vehicle to
confirm the features.
Keep this manual in the vehicle for
quick reference.
Canadian Vehicle Owners
A French language manual can be
obtained from your dealer, at
www.helminc.com, or from:
Propriétaires Canadiens
On peut obtenir un exemplaire de ce
guide en français auprès du
concessionnaire ou à l'adresse
suivante:
Helm, Incorporated
Attention: Customer Service
47911 Halyard Drive
Plymouth, MI 48170
USA
Litho in U.S.A.
Part No. 84432194 B Second Printing©2020 General Motors LLC. All Rights Reserved.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
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 . . . . . . . . . . . . . . 13
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power Door Locks . . . . . . . . . . . . . . . . . 17
Delayed Locking . . . . . . . . . . . . . . . . . . . 17
Automatic Door Locks . . . . . . . . . . . . 17
Lockout Protection . . . . . . . . . . . . . . . . 18
Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . 18
Doors
Trunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . . . . . 20
Vehicle Alarm System . . . . . . . . . . . . . 20
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . 22
Immobilizer Operation . . . . . . . . . . . . 23
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . . . . . 23
Power Mirrors . . . . . . . . . . . . . . . . . . . . . . 24
Folding Mirrors . . . . . . . . . . . . . . . . . . . . 24
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . 25
Automatic Dimming Mirror . . . . . . . 25
Reverse Tilt Mirrors . . . . . . . . . . . . . . . 25
Interior Mirrors
Interior Rearview Mirrors . . . . . . . . . 26
Manual Rearview Mirror . . . . . . . . . . 26
Automatic Dimming Rearview Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Power Windows . . . . . . . . . . . . . . . . . . . . 26
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Keys and Locks
Keys
{Warning
Leaving children in a vehicle with a
remote 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 remote key 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 a
remote key.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
KEYS, DOORS, AND WINDOWS 7
The mechanical key, inside the remote
key, is used for the driver door and
glove box.To remove the mechanical key, press
the button on the side of the remote
key near the bottom, and pull the
mechanical key out. Never pull the
mechanical key out without pressing
the button.
If it becomes difficult to turn the key,
inspect the key blade for debris.
Periodically clean with a brush
or pick.
See your dealer if a new mechanical
key is needed.
Contact Roadside Service if locked out
of the vehicle. See
Roadside Service
0 403.
With an active OnStar or connected
service plan, an OnStar Advisor may
remotely unlock the vehicle. See
OnStar Overview 0413.
Remote Keyless Entry
(RKE) System
See Radio Frequency Statement 0409.
If there is a decrease in the remote
key operating range:
.Check the distance. The remote key
may be too far from the vehicle.
.Check the location. Other vehicles
or objects may be blocking the
signal.
.Check the remote key battery. See
“Battery Replacement ”later in this
section.
.If the remote key is still not working
correctly, see your dealer or a
qualified technician for service.
Remote Keyless Entry
(RKE) System Operation
The Keyless Access system allows for
vehicle entry when the remote key is
within 1 m (3 ft). See “Keyless Access
Operation ”later in this section.
The remote key functions may work
up to 60 m (197 ft) away from the
vehicle.
Other conditions can impact the
performance of the remote key. See
Remote Keyless Entry (RKE) System
0 7.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
8 KEYS, DOORS, AND WINDOWS
Q:Press to lock all doors and the fuel
door, if equipped. The turn signal
indicators may flash and/or the horn
may sound on the second press to
indicate locking. See Vehicle
Personalization 0117.
Pressing
Qmay also arm the alarm
system. See Vehicle Alarm System 020.
If equipped with remote folding
mirrors, pressing
Qon the remote key
may fold the mirrors. See Folding
Mirrors 024.
K:Press to unlock the driver door
and the fuel door, if equipped. Press
again within five seconds to unlock all
doors. The remote key can be programmed to unlock all doors on
the first button press. See
Vehicle
Personalization 0117. When remotely
unlocking the vehicle at night, the
headlamps and back-up lamps may
come on for about 30 seconds to light
your approach to the vehicle. The turn
signal indicators may flash to indicate
unlocking.
Pressing
Kwill disarm the alarm
system. See Vehicle Alarm System 020.
Press and hold
Kfor about
three seconds to remotely open the
windows, if enabled. See Vehicle
Personalization 0117.
If equipped with remote folding
mirror, pressing
Kon the remote key
may unfold the mirrors. See Folding
Mirrors 024.
S:PressStwice to start the engine
from outside the vehicle using the
remote key. See Remote Vehicle Start
0 13.
7:Press and release one time to
initiate vehicle locator. The exterior
lamps flash and the horn chirps three
times. Press and hold
7for more than three seconds to sound the panic
alarm. The horn sounds and the turn
signal lamps flash for 30 seconds,
or until
7is pressed again or the
vehicle is started.
X: Press twice to release the trunk.
Keyless Access Operation
The Keyless Access system lets you
lock and unlock the doors and access
the trunk without removing the
remote key from your pocket, purse,
briefcase, etc. The remote key must be
within 1 m (3 ft) of the trunk or door
being opened. The button is on the
outside door handle.
The Keyless Access system can be
programmed to be turned off or to
unlock all doors on the first door
handle press from the driver door.
Keyless unlocking can also be turned
off. See Vehicle Personalization 0117.
If equipped with memory seats,
remote keys 1 and 2 are linked to
seating positions of memory 1 or 2.
See Memory Seats 034.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
KEYS, DOORS, AND WINDOWS 9
Keyless Unlocking/Locking from the
Driver Door
When the doors are locked and the
remote key is within 1 m (3 ft) of the
door handle, pressing the door handle
button on the driver door handle will
unlock the driver door. If the door
handle button is pressed again within
five seconds, all passenger doors will
unlock.
If equipped with remote folding
mirror, pressing the driver door
handle button may fold and unfold
the mirrors. SeeFolding Mirrors024.
Driver Door Shown, Passenger Similar Pressing the door handle button will
cause all doors to lock if any of the
following occur:
.It has been more than five seconds
since the first door handle button
press.
.Two door handle button presses
were used to unlock all doors.
.Any vehicle door has opened and all
doors are now closed.
Keyless Unlocking/Locking from the
Passenger Doors
When the doors are locked and the
remote key is within 1 m (3 ft) of the
door handle, pressing the door handle
button on a passenger door handle
will unlock all doors. Pressing the
door handle button will cause all
doors to lock if any of the following
occur:
.The door handle button was used to
unlock all doors.
.Any vehicle door has opened and all
doors are now closed. Disable/Enable Keyless Unlocking of
Exterior Door Handles and Trunk
If equipped, keyless unlocking of the
exterior door handles and trunk can
be disabled and enabled.
Disabling Keyless Unlocking:
With the vehicle off, press and hold
Q
andKon the remote key at the same
time for approximately four seconds.
The turn signal lamps will flash four
times quickly to indicate access is
disabled. Using any exterior handle to
unlock the doors or open the trunk
will cause the turn signal lamps to
flash four times quickly, indicating
access is disabled. If disabled, disarm
the alarm system before starting the
vehicle.
Disabling Keyless Unlocking may also
be configured under Vehicle
Personalization. See Vehicle
Personalization 0117.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
10 KEYS, DOORS, AND WINDOWS
Enabling Keyless Unlocking:
With the vehicle off, press and hold
Q
andKon the remote key at the same
time for approximately four seconds.
The turn signal lamps will flash twice
quickly to indicate access is enabled.
Enabling Keyless Unlocking may also
be configured under Vehicle
Personalization. See Vehicle
Personalization 0117.
Passive (Walkaway) Locking
The Keyless Access system will lock
the vehicle several seconds after all
doors are closed if the vehicle is off
and at least one remote key has been
removed or none remain in the
vehicle.
If equipped, the fuel door will
also lock.
If other electronic devices interfere
with the remote key signal, the vehicle
may not detect the remote key inside
the vehicle. If passive (walkaway)
locking is enabled, the doors may lock
with the remote key inside the vehicle.
Do not leave the remote key in an
unattended vehicle. To customize the doors to
automatically lock when exiting the
vehicle, see
Vehicle Personalization
0 117.
If equipped with remote folding
mirror, passive (walkaway) locking
may fold the mirrors. See Folding
Mirrors 024.
Temporary Disable of Passive
(Walkaway) Locking
Temporarily disable passive locking by
pressing and holding
Kon the
interior door switch with a door open
for at least four seconds, or until three
chimes are heard. Passive (walkaway)
locking will then remain disabled until
the vehicle is turned on.
Remote Key Left In Vehicle Alert
When the vehicle is turned off and a
remote key is left in the vehicle, the
horn will chirp three times after all
doors are closed. To turn on or off see
Vehicle Personalization 0117. Remote Key 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 a remote key
inside. If a remote key is not detected,
the Driver Information Center (DIC)
will display NO KEY FOUND and the
horn will chirp three times.
This occurs only once each time the
vehicle is driven. See
Vehicle
Personalization 0117.
Keyless Trunk Opening
Press the touch pad on the rear of the
trunk above the license plate if the
remote key is within 1 m (3 ft).
Mechanical Key Access
To access a vehicle with a weak
remote key battery, see Door Locks
0 15.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
KEYS, DOORS, AND WINDOWS 11
Programming Remote Keys to
the Vehicle
Only remote keys programmed to the
vehicle will work. If a remote key is
lost or stolen, a replacement can be
purchased and programmed through
your dealer. The vehicle can be
reprogrammed so that lost or stolen
remote keys no longer work. Each
vehicle can have up to eight remote
keys matched to it.
Programming with Recognized
Remote Keys
A new key can be programmed to the
vehicle when there are two
recognized keys.
To program, the vehicle must be in
RUN and both the recognized and new
remote keys must be with you.1. Place the two recognized remote keys on the passenger seat.
2. Scroll to the DIC menu to "Remote Key Relearn" and select.
The DIC displays READY FOR
REMOTE #3, 4, 5, etc.
3. Place the new remote key into therear cupholder.
4. Press ENGINE START/STOP. When the remote key is learned the DIC
display will show that it is ready to
program the next remote key.
5. Remove the remote key from the rear cupholder and press
KorQ
on the remote key.
To program additional remote keys,
repeat Steps 4–5. When all additional remote keys
are programmed, press and hold
ENGINE START/STOP for
approximately 12 seconds to exit
programming mode.
Programming without Recognized
Remote Keys
If two currently recognized remote
keys are not available, see your dealer
to program new remote keys.
Starting the Vehicle with a Low
Remote Key Battery
For improved vehicle security, the
remote key is equipped with a motion
sensor. When starting the vehicle,
if the remote key has been idle for a
while, the DIC may display KEY IN
SLEEP MODE, MOVE KEY, THEN
START. Move the remote key slightly
and try starting the vehicle. When
starting the vehicle, if the remote key
battery is depleted or there is signal
interference, the DIC may display NO
KEY FOUND, REPLACE BATTERY IN
KEY or NO REMOTE KEY WAS
DETECTED PLACE KEY IN KEY

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
12 KEYS, DOORS, AND WINDOWS
POCKET THEN START YOUR
VEHICLE, follow the steps shown
below:
1. Place the remote key into the rearcupholder.
2. With the vehicle in P (Park) or N (Neutral) press the brake pedal
and ENGINE START/STOP.
Replace the remote key battery as
soon as possible.
Battery Replacement
{Warning
Never allow children to play with
the remote key. The remote key
contains a small battery, which can
be a choking hazard. If swallowed,
internal burns can occur, resulting
in severe injury or death. Seek
medical attention immediately if a
battery is swallowed.
{Warning
To avoid personal injury, do not
touch metal surfaces on the remote
key when it has been exposed to
extreme heat. These surfaces can be
hot to the touch at temperatures
above 59 °C (138 °F).
Caution
When replacing the battery, do not
touch any of the circuitry on the
remote key. Static from your body
could damage the remote key.
Caution
Always replace the battery with the
correct type. Replacing the battery
with an incorrect type could
potentially create a risk of battery
explosion. Dispose of used batteries
according to instructions and local
laws. Do not attempt to burn,
crush, or cut the used battery, and
avoid exposing the battery to
environments with extremely low
air pressures or high temperatures.
Replace the battery if the DIC displays
REPLACE BATTERY IN KEY.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
KEYS, DOORS, AND WINDOWS 13
1. Press the button on the side of theremote key near the bottom and
pull the mechanical key out. Never
pull the mechanical key out
without pressing the button.
2. Use the mechanical key blade inthe slot to remove the battery
cover by hand.
3. Remove the seal by pulling on thetab to access the battery.
4. Remove the old battery. Do not use a metal object.
5. Insert the new battery, negative side facing down. Replace with a
CR2450 or equivalent battery.
6. Replace the seal, pushing it into the groove around the battery
compartment.
7. Replace the battery cover by snapping it back into the
remote key.
8. Reinsert the mechanical key.
Remote Vehicle Start
This feature allows the engine to be
started from outside the vehicle.
S: This button on the remote key is
for remote start.
The climate control system will use
the previous settings during a remote
start. The rear window defogger may
come on during remote start based on
cold ambient conditions. The rear
defog indicator light does not come on
during remote start.
If equipped, the heated and ventilated
front seats may also come on when
the vehicle personalization setting is
enabled. See Heated and Ventilated
Front Seats 037.
If equipped with a remote start heated
steering wheel, it may come on during
a remote start. See Heated Steering
Wheel 082.
Laws in some local communities may
restrict the use of remote starters. For
example, some laws may require a
person using remote start to have the
vehicle in view. Check local
regulations for any requirements.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
14 KEYS, DOORS, AND WINDOWS
If your vehicle is low on fuel, do not
use the remote start feature. The
vehicle may run out of fuel.
The remote key range may be shorter
while the vehicle is running.
Other conditions can affect the
performance of the remote key. See
Remote Keyless Entry (RKE) System
07.
You are allowed multiple starts
totaling 30 minutes of engine run
time. The maximum run time of a
single start is 15 minutes, and it will
shut off automatically. You could do
three 10 minute starts if you manually
shut off after 10 minutes. The last
10 minute start would shut off
automatically as your total
30 minutes will have been used.
Starting the Engine Using Remote
Start
1. Press
Stwice on the remote key.
The turn signal lamps will flash.
The lamps flash to confirm the
request to remote start the vehicle
has been received. During the
remote start, the doors will be locked and the parking lamps will
remain on as long as the engine is
running.
2. The engine will shut off after 15 minutes or after the remainder
of the 30 minute total running
time is used, unless you stop the
remote start before engine running
has completed or the vehicle is
turned on.
3. After entering the vehicle during a remote start, press the brake and
ENGINE START/STOP with the
remote key in the vehicle to drive
the vehicle.
Additional Engine Run Time
Remote start can be used for up to
30 minutes of total engine run time.
After two remote starts of 15 minutes,
or multiple shorter time starts
totaling 30 minutes have been used,
the vehicle must be started normally
before the remote start can be used
again. Canceling a Remote Start
To cancel a remote start, do any of
the following:
.PressS. The parking lamps will
turn off.
.Turn on the hazard warning
flashers.
.Turn the vehicle on and then
back off.
Conditions in Which Remote Start
Will Not Work
The remote start will not operate if
any of the following occur:
.The ignition is in any mode other
than off.
.A remote key is in the vehicle.
.The hood is not closed.
.The hazard warning flashers are on.
.There is an emission control system
malfunction.
.The engine coolant temperature is
too high.
.The oil pressure is low.
.The 30 minutes of engine run time
have been used.
.The vehicle is not in P (Park).