2023 CADILLAC CT4 ignition

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
332 Driving and Operating
Super Cruise Message Summary (cont'd)
Unavailable You Have Taken Vehicle Control.The brake pedal is being pressed.
.The Adaptive Cruise Control has been canceled or
turned off.
Unavailable Sensor Blocked Clear snow, ice, dirt, or other contaminants from the front and rear areas of the vehicle.
Unavailable Sharp Curve Some curves are too sharp to be navigated by the Super Cruise system. Super Cruise will be available after the curve is
traveled.
Super Cruise Unavailable Super Cruise is unavailable for reasons not described in other messages.
Super Cruise Locked Out See Owner’s Manual The driver did not take control of the vehicle when prompted by the Super Cruise system. The Super Cruise system will be
disabled until the ignition is turned off and back on.
Map Updates
Super Cruise map information
must be periodically updated
at least once every seven
months to determine whether
Super Cruise is available on
certain roads.
See the following website for
Super Cruise map open source
compliance documentation,
including the license
information:https://oss.veoneer.com/
Data Download
If the vehicle is equipped with
OnStar and has an active
service plan, additional data
may be collected through the
OnStar system. This includes
information about: the
vehicle’s operation; a crash
involving the vehicle; the use
of the vehicle and its features;
and, in certain situations, the
location and approximate GPSspeed of the vehicle. Refer to
the OnStar Terms and
Conditions and Privacy
Statement on the OnStar
website.
Location Services
This setting enables or
disables sharing of vehicle
location outside the vehicle for
certain purposes. Even if the
Location Services setting is
disabled, vehicle location
information will continue to be

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
390 Vehicle Care
To use this feature:
1. With a cold system, addcoolant to the indicated
line on the surge tank.
2. Replace the pressure cap on the surge tank.
3. Activate the service feature:
3.1. Connect the vehicle to a battery charger.
3.2.Turn the ignition to Service Mode. See
Ignition Positions 0261.
3.3.Turn off the air conditioning. 3.4.Set the parking brake.
3.5.At the same time, press
the accelerator and the
brake pedal for
two seconds, then
release.
3.6.At the end of the cycle, check the coolant level
in the surge tank and
add coolant if it is
below the indicated
line. Turn the ignition
off, allow the Electronic
Control Module (ECM)
to go to sleep, about
two minutes, and
repeat Steps 3.2 –3.6.
Listen for pump activation and
movement of the control
valves while watching the level
of the coolant in the surge
tank. If the tank empties, turn
the ignition off, carefully
remove the pressure cap, refill
to the indicated line, replace
the pressure cap, and repeat
steps 3.2 –3.6. The fill and air removal
process will run for
approximately 15 minutes.
Caution
If the pressure cap is not
tightly installed, coolant loss
and engine damage may
occur. Be sure the cap is
properly and tightly secured.
2.7L L4 Engine
Automatic Coolant Service
Fill Instructions
The vehicle is equipped with a
service feature that assists
with filling and removing air
from the cooling system after
service of components or
when coolant is added after
being to low.
To use this feature:
1. With a cold system unscrew the cooling
system air bleeder cap.
If coolant can be seen
through the bleeder move
to Step 3.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Vehicle Care 391
2. Add coolant through thesurge tank until it is visible
through the air bleeder.
3. Replace the cooling system air bleeder cap.
4. Add coolant to the indicated line on the
surge tank.
5. Replace the pressure cap on the surge tank.
6. Activate the service feature:
6.1. Connect the vehicle to a battery charger.
6.2.Turn the ignition to Service Mode. See
Ignition Positions 0261.
6.3.Turn off the air conditioning.
6.4.Set the parking brake.
6.5.At the same time, press the accelerator and the
brake pedal for
two seconds, then
release. 6.6.At the end of the cycle,
check the coolant level
in the surge tank and
add coolant if it is
below the indicated
line. Turn the ignition
off, carefully remove
the pressure cap, refill
to the indicated line,
replace the pressure
cap, and repeat steps
6.2 –6.6.
Listen for pump activation and
movement of the control
valves while watching the level
of the coolant in the surge
tank. If the tank empties, turn
the ignition off, carefully
remove the pressure cap, refill
to the indicated line, replace
the pressure cap, and repeat
steps 6.2 –6.6.
The fill and air removal
process will run for
approximately 15 minutes.Caution
If the pressure cap is not
tightly installed, coolant loss
and engine damage may
occur. Be sure the cap is
properly and tightly secured.
Engine Overheating
The vehicle has an indicator to
warn of the engine
overheating.
If the decision is made not to
lift the hood when this
warning appears, get service
help right away. See Roadside
Assistance Program 0487.
If the decision is made to lift
the hood, make sure the
vehicle is parked on a level
surface.
Then check to see if the
engine cooling fan is running.
If the engine is overheating,
the fan should be running. If it
is not, do not continue to run
the engine. Have the vehicle
serviced.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Vehicle Care 397
When the ignition is turned on
after new pads and wear
sensors are installed, a
message will display. Follow
the prompts to reset the
system.
The brake pad life system can
also be manually reset:1. Display Brake Pad Life on the DIC. See Driver
Information Center (DIC)
(Base Level) 0129 or
Driver Information Center
(DIC) (Uplevel) 0132.
2. Select the Brake Pad Life menu.
3. Select front or rear pads as appropriate.
4. Select YES on the confirmation message.
Repeat for the pads on the
other axle if they were also
replaced.How to Disable the Brake
Pad Life System
The brake pad life system can
be turned off. This may be
necessary if aftermarket brake
pads without wear sensors
are installed. When the system
is turned off, the front and
rear brake pad
life percentages will not
display. However, the built-in
wear indicators that make a
high-pitched warning sound
when the brake pads are worn
can still determine when the
pads should be replaced. See
Brakes 0393.
To turn off the brake pad life
system: 1. Display Brake Pad Life on the DIC. See Driver
Information Center (DIC)
(Base Level) 0129 or
Driver Information Center
(DIC) (Uplevel) 0132.
2. Select the Brake Pad Life menu.
3. Select DISABLE. To turn the brake pad life
system back on, follow the
above steps but select
ENABLE in Step 2.
Brake Pad Sensor System
(V-Series Blackwing)
The V-Series Blackwing has
electronic brake pad wear
sensors, when the brake pads
need to be replaced, a
message displays in the Driver
Information Center (DIC).
When the message displays,
install new brake pads and
brake pad wear sensors on
the vehicle.
When the ignition is turned on
after new brake pads and
brake pad wear sensors are
installed, the message should
no longer display.
The brake pad sensor system
can only be reset by replacing
the brake pads and brake pad
wear sensors.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Vehicle Care 405
Replacing a Blown Fuse
1. Turn off the ignition.
2. Locate the fuse puller inthe engine compartment
fuse block.
3. Use the fuse puller toremove the fuse from the
top or side, as shown
above.
4. If the fuse must be replaced immediately,
borrow a replacement fuse
with the same amperage
from the fuse block.
Choose a vehicle feature
that is not needed to
safely operate the vehicle.
Repeat Steps 2-3.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
408 Vehicle Care
Fuses Usage
1 Long Range RadarFront Sensor
2 Park/Daytime Running Lamps
3 Exterior Lighting Module 4
4 Exterior Lighting Module 7
5 Headlamp Level
6 –
Fuses Usage
7 Electronic Brake
Control Module
8 Washer Pump
9 –
10 –
11 –
12 Horn
13 Front Wiper
Fuses Usage
14 Exterior Lighting Module 6
15 Exterior Lighting Module 1
16 Exterior Lighting Module 5
17 Exterior Lighting Module 3
18 Aero Shutter
19 –
20 –
21 Virtual Key System/ Power Sounder
Module
22 Engine Control Module Battery
23 Transmission Control Module
24 Active Engine Mount
25 –
26 Engine Control Module
27 Injectors/Ignition 2
28 Charged Air Cooler/ Not Used
29 Transmission Aux Oil Pump/Transmission
Reverse Lock Out

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Vehicle Care 409
Fuses Usage
30 Injectors/Ignition 131 Emissions 1
32 Emissions 2
33 Starter Solenoid
34 –
35 –
36 Starter Pinion/ Not Used
37 AC Clutch
38 –
39 –
40 –
41 –
42 Water Pump/ Not Used
43 –
44 –
Relays Usage
47–
48 Front Wiper Speed/ Not Used
49 Front Wiper Control 51 –
Relays Usage
52 Engine Control
Module
53 Starter Solenoid
54 Starter Pinion/ Not Used
55 –
57 AC Clutch
58 –
Instrument Panel
Fuse Block
The instrument panel fuse
block is in the end of the driver
side of the instrument panel.
To access the fuses, remove
the end panel by gently prying
with a plastic tool near each
clip, beginning at the point
shown.
To install the end cover, insert
the tabs on the back of the
cover into the slots in the
instrument panel at the points
shown. Align the clips with the
slots in the instrument panel,
and press the cover into place.
The vehicle may not be
equipped with all of the fuses
and relays shown.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Vehicle Care 411
Fuses Usage
29–
30 –
31 Headlamp Level
32 –
33 Body Ignition/IP Ignition
34 Exhaust Valve
35 Transmission Control Module Ignition/
Engine Control Module
Ignition/Shift Ignition/
Brake Ignition
36 Shift Module 37 Body Control Module 1/Electronic
Park Brake Switch
38 Center Stack Module
39 Steering Wheel Controls
40 Body Control Module 2
41 Body Control Module 3
42 Body Control Module 4
Circuit
Breakers Usage
CB1 Auxiliary Power
Outlet 1
CB2 Auxiliary Power Outlet 2
Relays Usage
1 Run After Park/Accessory
2 Run Crank
3 –
4 –
5 –
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.