2023 CADILLAC CT4 service

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
70 Seats and Restraints
and braking, which helps the
passenger sensing system
maintain the passenger airbag
status. See“Seat Belts” and
“Child Restraints” in the Index
for additional information
about the importance of
proper restraint use.
A thick layer of additional
material, such as a blanket or
cushion, or aftermarket
equipment such as seat
covers, seat heaters, and seat
massagers can affect how well
the passenger sensing system
operates. We recommend that
you not use seat covers or
other aftermarket equipment
except when approved by GM
for your specific vehicle. See
Adding Equipment to the
Airbag-Equipped Vehicle 070
for more information about
modifications that can affect
how the system operates.
The ON indicator may be lit if
an object, such as a briefcase,
handbag, grocery bag, laptop,
or other electronic device, is put on an unoccupied seat.
If this is not desired, remove
the object from the seat.
{Warning
Stowing articles under the
passenger seat or between
the passenger seat cushion
and seatback may interfere
with the proper operation of
the passenger sensing
system.
Servicing the
Airbag-Equipped
Vehicle
Airbags affect how the vehicle
should be serviced. There are
parts of the airbag system in
several places around the
vehicle. Your dealer and the
service manual have
information about servicing
the vehicle and the airbag
system. To purchase a service
manual, see Publication
Ordering Information
0494.
{Warning
For up to 10 seconds after
the vehicle is turned off and
the battery is disconnected,
an airbag can still inflate
during improper service. You
can be injured if you are
close to an airbag when it
inflates. Avoid yellow
connectors. They are
probably part of the airbag
system. Be sure to follow
proper service procedures,
and make sure the person
performing work for you is
qualified to do so.
Adding Equipment to
the Airbag-Equipped
Vehicle
Adding accessories that
change the vehicle's frame,
bumper system, height, front
end, or side sheet metal may
keep the airbag system from
working properly.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Seats and Restraints 71
The operation of the airbag
system can also be affected
by changing, including
improperly repairing or
replacing, any parts of the
following:
.Airbag system, including
airbag modules, front or side
impact sensors, sensing and
diagnostic module, or airbag
wiring
.Front seats, including
stitching, seams or zippers
.Seat belts
.Steering wheel, instrument
panel, overhead console,
ceiling trim, or pillar
garnish trim
.Inner door seals, including
speakers
Your dealer and the service
manual have information about
the location of the airbag
modules and sensors, sensing
and diagnostic module, and
airbag wiring along with the
proper replacement
procedures. In addition, the vehicle has a
passenger sensing system for
the front outboard passenger
position, which includes
sensors that are part of the
passenger seat. The
passenger sensing system
may not operate properly if
the original seat trim is
replaced with non-GM covers,
upholstery, or trim; or with GM
covers, upholstery, or trim
designed for a different
vehicle. Any object, such as an
aftermarket seat heater or a
comfort-enhancing pad or
device, installed under or on
top of the seat fabric, could
also interfere with the
operation of the passenger
sensing system. This could
either prevent proper
deployment of the passenger
airbag(s) or prevent the
passenger sensing system
from properly turning off the
passenger airbag(s). See
Passenger Sensing System
0
66. If the vehicle has rollover
roof-rail airbags, see Different
Size Tires and Wheels
0433
for additional important
information.
If the vehicle must be modified
because you have a disability
and have questions about
whether the modifications will
affect the vehicle's airbag
system, or if you have
questions about whether the
airbag system will be affected
if the vehicle is modified for
any other reason, call
Customer Assistance. See
Customer Assistance Offices
0 485.Airbag System Check
The airbag system does not
need regularly scheduled
maintenance or replacement.
Make sure the airbag
readiness light is working. See
Airbag Readiness Light 0116.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
72 Seats and Restraints
Caution
If an airbag covering is
damaged, opened, or broken,
the airbag may not work
properly. Do not open or
break the airbag coverings.
If there are any opened or
broken airbag coverings,
have the airbag covering
and/or airbag module
replaced. For the location of
the airbags, see Where Are
the Airbags?061. See your
dealer for service.
Replacing Airbag
System Parts after a
Crash
{Warning
A crash can damage the
airbag systems in the
vehicle. A damaged airbag
system may not properly
protect you and your
passenger(s) in a crash,
(Continued)
Warning (Continued)
resulting in serious injury or
even death. To help make
sure the airbag systems are
working properly after a
crash, have them inspected
and any necessary
replacements made as soon
as possible.
If an airbag inflates, you will
need to replace airbag system
parts. See your dealer for
service.
If the airbag readiness light
stays on after the vehicle is
started or comes on when you
are driving, the airbag system
may not work properly. Have
the vehicle serviced right
away. See Airbag Readiness
Light 0116.
Child Restraints
Older Children
Older children who have
outgrown booster seats
should wear the vehicle’s seat
belts. Refer to How to Wear
Seat Belts Properly 051.
The manufacturer instructions
that come with the booster
seat state the weight and
height limitations for that

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Instruments and Controls 97
Instruments and
Controls
Controls
Steering WheelAdjustment . . . . . . . . . . . . . . . . . . 98
Heated Steering Wheel . . . 98
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Windshield Wiper/ Washer . . . . . . . . . . . . . . . . . . . . . . . 99
Compass . . . . . . . . . . . . . . . . . . . . . . 101
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Power Outlets . . . . . . . . . . . . . . . 101
Wireless Charging . . . . . . . . . 102
Warning Lights, Gauges,
and Indicators
Warning Lights, Gauges, and Indicators . . . . . . . . . . . . . 105
Instrument Cluster (Base Level) . . . . . . . . . . . . . . . . . . . . . . . . 106
Instrument Cluster (Uplevel) . . . . . . . . . . . . . . . . . . . . . 108
Speedometer . . . . . . . . . . . . . . . . 112
Odometer . . . . . . . . . . . . . . . . . . . . . 112
Trip Odometer . . . . . . . . . . . . . . . 112
Tachometer . . . . . . . . . . . . . . . . . . 113
Fuel Gauge . . . . . . . . . . . . . . . . . . . 113 Engine Coolant
Temperature Gauge
(Base Level) . . . . . . . . . . . . . . . . 114
Engine Coolant Temperature Gauge
(Uplevel) . . . . . . . . . . . . . . . . . . . . . 115
Seat Belt Reminders . . . . . . . 115
Airbag Readiness Light . . . 116
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . 117
Charging System Light . . . 117
Malfunction Indicator Lamp (Check Engine
Light) . . . . . . . . . . . . . . . . . . . . . . . . . 118
Brake System Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . 120
Electric Parking Brake Light . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Service Electric Parking Brake Light . . . . . . . . . . . . . . . . . 121
Antilock Brake System (ABS) Warning Light . . . . . 121
Performance Shifting Light . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Automatic Vehicle Hold (AVH) Light . . . . . . . . . . . . . . . . . 122
Lane Keep Assist (LKA) Light . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Automatic Emergency
Braking (AEB) Disabled
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Vehicle Ahead Indicator . . . . . . . . . . . . . . . . . . . . . 123
Pedestrian Ahead Indicator . . . . . . . . . . . . . . . . . . . . . 123
Traction Off Light . . . . . . . . . 123
StabiliTrak OFF Light . . . . . 124
Traction Control System (TCS)/StabiliTrak
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Engine Coolant Temperature Warning
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Driver Mode Control Light . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Tire Pressure Light . . . . . . . . 126
Engine Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Security Light . . . . . . . . . . . . . . . 128
High-Beam On Light . . . . . . 128
Lamps On Reminder . . . . . . 128
Cruise Control Light . . . . . . 128
Door Ajar Light . . . . . . . . . . . . . 129

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Instruments and Controls 105
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THIS SOFTWARE IS
PROVIDED BY THE
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POSSIBILITY OF SUCH
DAMAGE.Warning Lights,
Gauges, and
Indicators
Warning lights and gauges can
signal that something is wrong
before it becomes serious
enough to cause an expensive
repair or replacement. Paying
attention to the warning lights
and gauges could prevent
injury.
Some warning lights come on
briefly when the engine is
started to indicate they are
working. When one of the
warning lights comes on and
stays on while driving, or when
one of the gauges shows
there may be a problem, check
the section that explains what
to do. Waiting to do repairs
can be costly and even
dangerous.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
116 Instruments and Controls
If the driver seat belt is
buckled, neither the light nor
the chime comes on.
Front Passenger Seat Belt
Reminder Light
The vehicle may have a front
passenger seat belt reminder
light near the passenger
airbag status indicator. See
Passenger Sensing System
066.
When the vehicle is started,
this light flashes and a chime
may come on to remind
passengers to fasten their
seat belt.
Then the light stays on solid
until the belt is buckled. This
cycle continues several times
if the front passenger remains
or becomes unbuckled while
the vehicle is moving. If the front passenger seat
belt is buckled, neither the
chime nor the light comes on.
The front passenger seat belt
reminder light and chime may
come on if an object is put on
the seat such as a briefcase,
handbag, grocery bag, laptop,
or other electronic device. To
turn off the reminder light
and/or chime, remove the
object from the seat or buckle
the seat belt.
Airbag Readiness
Light
This light shows if there is an
electrical problem with the
airbag system. It is located in
the instrument cluster. The
system check includes the
airbag sensor(s), the
passenger sensing system,
the pretensioners, the airbag
modules, the wiring, and the
crash sensing and diagnostic
module. For more information
on the airbag system, see
Airbag System
059.
The airbag readiness light
comes on for several seconds
when the vehicle is started.
If the light does not come on
then, have it fixed immediately.
{Warning
If the airbag readiness light
stays on after the vehicle is
started or comes on while
driving, it means the airbag
system might not be working
properly. The airbags in the
vehicle might not inflate in a
crash, or they could even
inflate without a crash. To
help avoid injury, have the
vehicle serviced right away.
If there is a problem with the
airbag system, a Driver
Information Center (DIC)
message may also come on.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Instruments and Controls 117
Passenger Airbag
Status Indicator
The vehicle has a passenger
sensing system. See
Passenger Sensing System
066 for important safety
information. The overhead
console has a passenger
airbag status indicator.
When the vehicle is started,
the passenger airbag status
indicator will light ON and OFF,
and the symbols for on and
off, for several seconds as a
system check. Then, after
several more seconds, the
status indicator will light either
ON or OFF, and either the
symbol for on or off, to let you
know the status of the front
outboard passenger frontal
airbag and knee airbag. If the word ON, and the on
symbol, is lit on the passenger
airbag status indicator, it
means that the front outboard
passenger frontal airbag and
knee airbag are allowed to
inflate.
If the word OFF, and the off
symbol, is lit on the passenger
airbag status indicator, it
means that the passenger
sensing system has turned off
the front outboard passenger
frontal airbag and knee airbag.
If, after several seconds, all of
the symbols remain lit, or if no
symbols are lit, or if the airbag
readiness light is on, there
may be a problem with the
lights or the passenger
sensing system. See your
dealer for service right away.
{Warning
If the airbag readiness light
ever comes on and stays on,
it means that something may
be wrong with the airbag
(Continued)
Warning (Continued)
system. To help avoid injury
to yourself or others, have
the vehicle serviced right
away. See Airbag Readiness
Light0116 for more
information, including
important safety
information.
Charging System
Light
The charging system light
comes on briefly when the
ignition is turned on, but the
engine is not running, as a
check to show the light is
working. It should go out when
the engine is started.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
118 Instruments and Controls
If the light stays on, or comes
on while driving, there may be
a problem with the electrical
charging system. Have it
checked by your dealer.
Driving while this light is on
could drain the battery.
When this light comes on, or is
flashing, the Driver Information
Center (DIC) also displays a
message.
If a short distance must be
driven with the light on, be
sure to turn off all
accessories, such as the radio
and air conditioner. Find a safe
place to stop the vehicle.
Malfunction Indicator
Lamp (Check Engine
Light)
This light is part of the
vehicle’s emission control
on-board diagnostic system.
If this light is on while the
engine is running, a
malfunction has been
detected and the vehicle mayrequire service. The light
should come on to show that it
is working when the ignition is
in Service Mode. See Ignition
Positions
0261.
Malfunctions are often
indicated by the system
before any problem is
noticeable. Being aware of the
light and seeking service
promptly when it comes on
may prevent damage.
Caution
If the vehicle is driven
continually with this light on,
the emission control system
may not work as well, the
fuel economy may be lower,
and the vehicle may not run
smoothly. This could lead to
(Continued)
Caution (Continued)
costly repairs that might not
be covered by the vehicle
warranty.
Caution
Modifications to the engine,
transmission, exhaust,
intake, or fuel system, or the
use of replacement tires
that do not meet the original
tire specifications, can cause
this light to come on. This
could lead to costly repairs
not covered by the vehicle
warranty. This could also
affect the vehicle’s ability to
pass an Emissions
Inspection/Maintenance
test. See Accessories and
Modifications0370.
If the light is flashing : A
malfunction has been
detected that could damage
the emission control system