2020 CADILLAC CT4 service

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
62 SEATS AND RESTRAINTS
.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 057.
If the vehicle has rollover roof-rail
airbags, see Different Size Tires and
Wheels 0284 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 0323.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 098.
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? 053. See
your dealer for service.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
SEATS AND RESTRAINTS 63
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, 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 098.
Child Restraints
Older Children
Older children who have outgrown
booster seats should wear the vehicle’s
seat belts.
The manufacturer instructions that
come with the booster seat state the
weight and height limitations for that
booster. Use a booster seat with a
lap-shoulder belt until the child
passes the fit test below: .
Sit all the way back on the seat.
Do the knees bend at the seat
edge? If yes, continue. If no, return
to the booster seat.
. Buckle the lap-shoulder belt. Does
the shoulder belt rest on the
shoulder? If yes, continue. If no,
try using the rear seat belt
comfort guide, if available. See
“Rear Seat Belt Comfort Guides”
under Lap-Shoulder Belt 047. If a
comfort guide is not available, or if
the shoulder belt still does not rest
on the shoulder, then return to the
booster seat.
. Does the lap belt fit low and snug
on the hips, touching the thighs?
If yes, continue. If no, return to
the booster seat.
. Can proper seat belt fit be
maintained for the length of the
trip? If yes, continue. If no, return
to the booster seat.
Q: What is the proper way to wear seat belts?
A: An older child should wear a
lap-shoulder belt and get the
additional restraint a shoulder belt

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
INSTRUMENTS AND CONTROLS 85
Instruments and
Controls
Controls
Steering Wheel Adjustment . . . . . . . 86
Steering Wheel Controls . . . . . . . . . . 86
Heated Steering Wheel . . . . . . . . . . . . 86
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Windshield Wiper/Washer . . . . . . . . 86
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Power Outlets . . . . . . . . . . . . . . . . . . . . . . 89
Wireless Charging . . . . . . . . . . . . . . . . . 90
Warning Lights, Gauges, and
Indicators
Warning Lights, Gauges, andIndicators . . . . . . . . . . . . . . . . . . . . . . . . . 92
Instrument Cluster . . . . . . . . . . . . . . . . 93
Speedometer . . . . . . . . . . . . . . . . . . . . . . . 96
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Trip Odometer . . . . . . . . . . . . . . . . . . . . . 96
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . 96
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . . . . . 96
Engine Coolant Temperature Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Seat Belt Reminders . . . . . . . . . . . . . . . 97
Airbag Readiness Light . . . . . . . . . . . . 98 Passenger Airbag Status
Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Charging System Light . . . . . . . . . . . . 99
Malfunction Indicator Lamp (Check Engine Light) . . . . . . . . . . . 100
Brake System Warning Light . . . . 102
Electric Parking Brake Light . . . . . 102
Service Electric Parking Brake Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Antilock Brake System (ABS) Warning Light . . . . . . . . . . . . . . . . . . 103
Automatic Vehicle Hold (AVH) Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Lane Keep Assist (LKA) Light . . . 103
Vehicle Ahead Indicator . . . . . . . . . 104
Pedestrian Ahead Indicator . . . . . . 104
Traction Off Light . . . . . . . . . . . . . . . . 104
StabiliTrak OFF Light . . . . . . . . . . . . 104
Traction Control System (TCS)/ StabiliTrak Light . . . . . . . . . . . . . . . . 105
Engine Coolant Temperature Warning Light . . . . . . . . . . . . . . . . . . 105
Driver Mode Control Light . . . . . . . 106
Tire Pressure Light . . . . . . . . . . . . . . . 106
Engine Oil Pressure Light . . . . . . . . 107
Low Fuel Warning Light . . . . . . . . . 107
Security Light . . . . . . . . . . . . . . . . . . . . . 107
High-Beam On Light . . . . . . . . . . . . . 107
Lamps On Reminder . . . . . . . . . . . . . 108
Cruise Control Light . . . . . . . . . . . . . . 108 Door Ajar Light . . . . . . . . . . . . . . . . . . . 108
Information Displays
Driver Information
Center (DIC) . . . . . . . . . . . . . . . . . . . . . 109
Head-Up Display (HUD) . . . . . . . . . 111
Vehicle Messages
Vehicle Messages . . . . . . . . . . . . . . . . . 115
Engine Power Messages . . . . . . . . . . 115
Vehicle Speed Messages . . . . . . . . . 115
Vehicle Personalization
Vehicle Personalization . . . . . . . . . . 116
Universal Remote System
Universal Remote System . . . . . . . . 121
Universal Remote System Programming . . . . . . . . . . . . . . . . . . . 121
Universal Remote System
Operation . . . . . . . . . . . . . . . . . . . . . . . . 124

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
92 INSTRUMENTS AND CONTROLS
DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED
AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE 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-13183937) -
2020 - crc - 4/28/20
INSTRUMENTS AND CONTROLS 97
There is an arrow near the fuel gauge
pointing to the side of the vehicle the
fuel door is on.
When the indicator nears empty, the
low fuel light comes on. There still is
a little fuel left, but the vehicle should
be refueled soon.
Here are four things that some owners
ask about. None of these show a
problem with the fuel gauge:
.At the service station, the fuel
pump shuts off before the gauge
reads full.
. It takes a little more or less fuel to
fill up than the gauge indicated.
For example, the gauge may have
indicated the tank was half full,
but it actually took a little more or
less than half the tank's capacity
to fill the tank.
. The gauge moves a little while
turning a corner or speeding up.
. The gauge takes a few seconds to
stabilize after the ignition is
turned on, and goes back to empty
when the ignition is turned off.Engine Coolant
Temperature Gauge
English
Metric
This gauge measures the temperature
of the vehicle's engine.
While driving under normal operating
conditions, if the red LED is
illuminated, the engine is too hot. Pull
off the road, stop the vehicle, and turn
off the engine as soon as possible.
Seat Belt Reminders
Driver Seat Belt Reminder Light
There is a driver seat belt reminder
light on the instrument cluster.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
INSTRUMENTS AND CONTROLS 99
Warning (Continued)
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.
Passenger Airbag Status
Indicator
The vehicle has a passenger sensing
system. See Passenger Sensing System
0 57 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 system. To help avoid
injury to yourself or others, have
the vehicle serviced right away. See
Airbag Readiness Light 098 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-13183937) -
2020 - crc - 4/28/20
100 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.
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 may
require service. The light should come
on to show that it is working when
the ignition is in Service Mode. See
Ignition Positions0158.
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 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 Modifications 0235.
If the light is f lashing : A
malfunction has been detected that
could damage the emission control
system and increase vehicle
emissions. Diagnosis and service may
be required.
To help prevent damage, reduce
vehicle speed and avoid hard
accelerations and uphill grades.
If towing a trailer, reduce the amount
of cargo being hauled as soon as
possible.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
INSTRUMENTS AND CONTROLS 101
If the light continues to flash, find a
safe place to park. Turn the vehicle off
and wait at least 10 seconds before
restarting the engine. If the light is
still flashing, follow the previous
guidelines and see your dealer for
service as soon as possible.
If the light is on steady :A
malfunction has been detected.
Diagnosis and service may be
required.
Check the following:
. If fuel has been added to the
vehicle using the capless fuel
funnel adapter, make sure that it
has been removed. See “Filling the
Tank with a Portable Gas Can ”
under Filling the Tank 0222. The
diagnostic system can detect if the
adapter has been left installed in
the vehicle, allowing fuel to
evaporate into the atmosphere.
A few driving trips with the
adapter removed may turn off the
light.
. Poor fuel quality can cause
inefficient engine operation and
poor driveability, which may go
away once the engine is warmed up. If this occurs, change the fuel
brand. It may require at least one
full tank of the proper fuel to turn
the light off. See
Recommended
Fuel (LSY 2.0L L4 Turbo Engine)
0 221 or
Recommended Fuel (L3B 2.7L L4
Turbo Engine) 0221.
If the light remains on, see your
dealer.
Emissions Inspection and
Maintenance Programs
If the vehicle requires an Emissions
Inspection/Maintenance test, the test
equipment will likely connect to the
vehicle's Data Link Connector (DLC).
The DLC is under the instrument
panel to the left of the steering wheel.
Connecting devices that are not used
to perform an Emissions Inspection/
Maintenance test or to service the vehicle may affect vehicle operation.
See
Add-On Electrical Equipment 0231.
See your dealer if assistance is needed.
The vehicle may not pass
inspection if:
. The light is on when the engine is
running.
. The light does not come on when
the ignition is in Service Mode.
. Critical emission control systems
have not been completely
diagnosed. If this happens, the
vehicle would not be ready for
inspection and might require
several days of routine driving
before the system is ready for
inspection. This can happen if the
12-volt battery has recently been
replaced or run down, or if the
vehicle has been recently serviced.
See your dealer if the vehicle will not
pass or cannot be made ready for
the test.