2021 CADILLAC CT4 sunroof

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
26 KEYS, DOORS, AND WINDOWS
Turn this feature on or off through
vehicle personalization. SeeVehicle
Personalization 0117.
Interior Mirrors
Interior Rearview Mirrors
Adjust the rearview mirror for a clear
view of the area behind the vehicle.
Do not spray glass cleaner directly on
the mirror. Use a soft towel dampened
with water.
Manual Rearview Mirror
If equipped, push the tab forward for
daytime use and pull it rearward for
nighttime use to avoid glare of the
headlamps from behind.
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.
Windows
{
Warning
Never 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
{Warning
Children could be seriously injured
or killed if caught in the path of a
closing window. Never leave the
remote key in a vehicle with
children. When there are children in
the rear seat, use the window
lockout switch to prevent operation
of the windows. See
Keys06.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
28 KEYS, DOORS, AND WINDOWS
Programming the Power
Windows
Programming may be necessary if the
vehicle battery has been disconnected
or discharged. If the window is unable
to express-up, program each
express-close window:1. Close all doors.
2. Turn the ignition on or to ACC/ ACCESSORY.
3. Partially open the window to be programmed. Then close it and
continue to pull the switch briefly
after the window has fully closed.
4. Open the window and continue to press the switch briefly after the
window has fully opened.
Remote Window Operation
If equipped, this feature allows all the
windows to be opened remotely.
If enabled in vehicle personalization,
press and hold
Kon the remote key
for about three seconds. See Vehicle
Personalization 0117.
Sun Visors
Pull the sun visor down to block glare.
Detach the sun visor from the center
mount to pivot to the side window
and, if equipped, extend along the rod.
Roof
Sunroof
If equipped, the ignition must be on
or in ACC/ACCESSORY, or Retained
Accessory Power (RAP) must be active
to operate the sunroof. See Ignition
Positions 0219 and
Retained Accessory Power (RAP) 0223.
While operating in express, movement
can be stopped by pressing the switch
again. The sunroof cannot be opened or
closed if the vehicle has an electrical
failure.
1. SLIDE Switch
2. TILT Switch
Sunroof Operation:
.Press and releaseD(1) to
express-open to the fully open
position.
.Pull and releaseD(1) to
express-close.
.Press or pull and holdD(1) to
open or close without express.
Release
D(1) at the desired
position.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
KEYS, DOORS, AND WINDOWS 29
Sunroof Vent Operation:
.Press and releaseE(2) to vent the
sunroof.
.Pull and releaseE(2) to close the
sunroof vent.
This sunroof also has a sunshade,
which must be opened and closed
manually.
Automatic Reversal System
The sunroof, if equipped, has an
automatic reversal system that is only
active when the sunroof is operated in
express-close mode.
If an object is in the path while
express-closing, the reversal system
will detect an object, stop, and open
the sunroof slightly.
If this condition occurs, attempt to
remove the object, then pull and
release the switch to express close.
If the reversal occurs multiple times,
the DIC message OPEN THEN CLOSE
SUNROOF will display, and express is
disabled. To operate sunroof while
express is disabled, the switch must
be either pressed or pulled and held.
Dirt and debris may collect on the
sunroof seal or in the track. This
could cause an issue with sunroof
operation or noise. It could also plug
the water drainage system.
Periodically open the sunroof and
remove any obstacles or loose debris.
Wipe the sunroof seal and roof sealing
area using a clean cloth, mild soap,
and water. Do not remove grease from
the sunroof.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
INFOTAINMENT SYSTEM 145
SiriusXM Satellite Radio Service
If equipped, SiriusXM Satellite Radio
Service provides digital radio
reception. Tall buildings or hills can
interfere with satellite radio signals,
causing the sound to fade in and out.
In addition, traveling or standing
under heavy foliage, bridges, garages,
or tunnels may cause loss of the
SiriusXM signal for a period of time.
Some cellular services may interfere
with SXM reception causing loss of
signal.
Mobile Device Usage
Mobile device usage, such as making
or receiving calls, charging, or just
having the mobile device on may
cause static interference in the radio.
Unplug the mobile device or turn it
off if this happens.
Multi-Band Antenna
The roof antenna may be used for
radio, navigation, and OnStar,
depending on the equipped options.
Keep clear of obstructions for clearreception. If the vehicle has a sunroof,
and it is open, reception can also be
affected.
Audio Players
Avoiding Untrusted Media
Devices
When using media devices such as SD
cards, USB devices, and mobile
devices, consider the source.
Untrusted media devices could
contain files that affect system
operation or performance. Avoid use if
the content or origin cannot be
trusted.
USB Port
Audio stored on a USB device may be
listened to.
The vehicle may be equipped with two
USB ports in the center console under
the armrest. These ports are for data
and charging. There may also be two
USB ports for charging only at the rear
of the center console.
Caution
To avoid vehicle damage, unplug all
accessories and disconnect all
accessory cables from the vehicle
when not in use. Accessory cables
left plugged into the vehicle,
unconnected to a device, could be
damaged or cause an electrical
short if the unconnected end comes
in contact with liquids or another
power source such as the accessory
power outlet.
Playing from a USB
A USB mass storage device can be
connected to the USB port.
Audio extensions supported by the
USB may include:
.MP3
.AAC
.OGG
.3GP
Gracenote
When plugging in a USB device,
Gracenote service builds voice tags for
music. Voice tags allow artists, albums

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
DRIVING AND OPERATING 223
3. Plug it into a normal, grounded110-volt AC outlet.
{Warning
Improper use of the heater cord or
an extension cord can damage the
cord and may result in overheating
and fire.
.Plug the cord into a three-prong
electrical utility receptacle that is
protected by a ground fault
detection function. An
ungrounded outlet could cause
an electric shock.
.Use a weatherproof, heavy-duty,
15 amp-rated extension cord if
needed. Failure to use the
recommended extension cord in
good operating condition,
or using a damaged heater or
extension cord, could make it
(Continued)
Warning (Continued)
overheat and cause a fire,
property damage, electric shock,
and injury.
.Do not operate the vehicle with
the heater cord permanently
attached to the vehicle. Possible
heater cord and thermostat
damage could occur.
.While in use, do not let the
heater cord touch vehicle parts
or sharp edges. Never close the
hood on the heater cord.
.Before starting the vehicle,
unplug the cord, reattach the
cover to the plug, and securely
fasten the cord. Keep the cord
away from any moving parts.
4. Before starting the engine, be sure to unplug and store the cord as it
was before to keep it away from
moving engine parts. If you do not,
it could be damaged.
Contact your dealer for information
on how long to use the heater in your
particular area.
Retained Accessory
Power (RAP)
When the ignition is turned from on
to off, the following features (if
equipped) will continue to function
for up to 10 minutes, or until the
driver door is opened. These features
will also work when the ignition is in
RUN or ACC/ACCESSORY:
.Infotainment System
.Power Windows (during RAP this
functionality will be lost when any
door is opened)
.Sunroof (during RAP this
functionality will be lost when any
door is opened)
.Auxiliary Power Outlet
.Audio System
.OnStar System
Shifting Into Park
(Mechanical Shifter)
1. Hold the brake pedal down and set the parking brake. See Electric
Parking Brake 0237.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
VEHICLE CARE 337
Rear Compartment Fuse
Block
The rear compartment fuse block is
behind a cover on the driver side of
the rear compartment.
The vehicle may not be equipped with
all of the fuses, relays, and features
shown.
FusesUsage
1 Remote function actuator
2 –
3 Driver heated seat
4 Fuel tank zone module
5 –
6 –
7 –
8 –
9 –
10 Motor seat belt passenger
11 Canister vent solenoid
12 Sunroof
13 –
14 –
15 Passenger heated seat
16 –

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
382 SERVICE AND MAINTENANCE
.Visually inspect halfshafts and drive
shafts for excessive wear, lubricant
leaks, and/or damage including:
tube dents or cracks, constant
velocity joint or universal joint
looseness, cracked or missing boots,
loose or missing boot clamps, center
bearing excessive looseness, loose or
missing fasteners, and axle seal
leaks.
.Check restraint system components.
SeeSafety System Check 047.
.Visually inspect fuel system for
damage or leaks.
.Visually inspect exhaust system and
nearby heat shields for loose or
damaged parts.
.Lubricate body components. See
Exterior Care 0370.
.Check parking brake and automatic
transmission park mechanism. See
Park Brake and P (Park) Mechanism
Check 0327.
.Check accelerator pedal for damage,
high effort, or binding. Replace if
needed.
.Visually inspect gas strut for signs
of wear, cracks, or other damage.
Check the hold open ability of the
strut. If the hold open is low,
service the gas strut. See Gas
Strut(s) 0328.
.Inspect sunroof track and seal,
if equipped. See Sunroof028.