Fuse Box Diagrams Cadillac CT4 (2020-2024)

In this article, you will find information about the fuses of the Cadillac CT4 (models 2020, 2021, 2022, 2023, and 2024), CT4-V (models 2022 2023, and 2024), including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.

Cadillac CT4 (2020-2024)

Checking and Replacing Fuses in Cadillac CT4

The vehicle has fuses and circuit breakers to protect against an electrical system overload. When the current electrical load is too heavy, the circuit breaker opens and closes, protecting the circuit until the current load returns to normal or the problem is fixed. This greatly reduces the chance of circuit overload and fire caused by electrical problems. Fuses and circuit breakers protect power devices in the vehicle.  To check a fuse, look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a new one of the identical size and rating. Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out.

Caution!

Do not exceed the specified amperage rating when replacing fuses and circuit breakers.

Location of Fuse Boxes

Engine Compartment Fuse Block:
The engine compartment fuse block is on the passenger side of the engine compartment. Lift the fuse block cover to access the fuses.
Cadillac CT4 (2020-2024): Engine compartment fuse box location

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.
Cadillac CT4 (2020-2024): Instrument panel fuse box location

Rear Compartment Fuse Block:
The rear compartment fuse block is behind a cover on the driver side of the rear compartment.
Cadillac CT4 (2020-2024): Rear compartment fuse box location

  • An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the headlamp wiring checked right away if the lamps go on and off or remain off.
  • If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop. To protect the wiper motor from overheating, the wipers may slow down when the windshield is dry for a long period of time. Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage.

Fuse Box Diagrams

2020

Engine Compartment Fuse Block

Cadillac CT4 (2020): Engine compartment fuse box diagram

List of fuses in the Engine Compartment Fuse Block (2020)
Usage
1Long range radar front sensor
2Park / Daytime running lamps
3Exterior lighting module 4
4Exterior lighting module 7
5Headlamp level
6-
7Electronic brake control module
8Washer pump
9-
10-
11-
12Horn
13Front wiper
14Exterior lighting module 6
15Exterior lighting module 1
16Exterior lighting module 5
17Exterior lighting module 3
18Aero shutter
19-
20-
21Virtual key system / Power sounder module
22-
23Transmission control module
24Active engine mount
25-
26Engine control module
27Injectors / Ignition 2
28Charged air cooler
29Transmission coolant pump
30Injectors / Ignition 1
31Emissions 1
32Emissions 2
33Starter solenoid
34-
35Coolant pump
36Starter pinion
37AC clutch
38-
39-
40-
41-
42Water pump
43-
44-
Relays
47-
48Front wiper speed
49Front wiper control
51-
52Engine control module
53Starter solenoid
54Starter pinion
55-
57AC clutch
58-
Instrument Panel Fuse Block

Cadillac CT4 (2020): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2020)
Usage
1-
2HVAC blower
3-
4-
5Theft deterrent / Universal garage door opener
6-
7Air quality ionizer
8Heated steering wheel
9-
10Electronic steering column lock 1
11-
12-
13-
14-
15-
16-
17-
18Display / Infotainment/USB
19Airbag / Automatic occupant sensing / Data link connection / Wireless charging module
20Power steering column module / Electronic steering column lock 2
21-
22-
23-
24-
25USB
26-
27-
28-
29-
30-
31Headlamp level
32-
33Body ignition / IP ignition
34Exhaust valve
35Transmission control module ignition / Engine control module ignition / Shift ignition / Brake ignition
36Shift module
37Body control module 1 / Electronic park brake switch
38Center stack module
39Steering wheel controls
40Body control module 2
41Body control module 3
42Body control module 4
Circuit Breakers
CB1Auxiliary power outlet 1
CB2Auxiliary power outlet 2
Relays
1Run after park / Accessory
2Run crank
3-
4-
5-
Rear Compartment Fuse Block

Cadillac CT4 (2020): Rear compartment fuse box diagram

List of fuses in the Rear Compartment Fuse Block (2020)
Usage
1Remote function actuator
2Engine control module
3Driver heated seat
4Fuel tank zone module
5-
6-
7-
8-
9-
10Motor seat belt passenger
11Canister vent solenoid
12Sunroof
13-
14-
15Passenger heated seat
16-
17Electronic suspension control
18-
19Motor seat belt driver
20Rear defog
21DC to DC transformer 2
22Driver power window door lock switch
23External object calculating module / Front camera module
24Passenger window door lock switch
25-
26Trailer
27Rear drive control module
28-
29-
30-
31DC to DC transformer 1
32Transfer case electronic control
33Central gateway module / Side blind zone alert
34Video processing module
35Hands free closure release
36Exterior lighting module 2
37Passenger memory seat module
38Trailer 2
39Right front / Right rear window
40-
41-
42Amplifier
43Park assist module
44Driver memory seat module
45OnStar
46-
47-
48-
49Trailer
50Driver seat
51Left front / Left rear window
52Passenger seat
Relays
53-
54-
55Run

2021

Engine Compartment Fuse Block

Cadillac CT4 (2021): Engine compartment fuse box diagram

List of fuses in the Engine Compartment Fuse Block (2021)
Usage
1Long range radar front sensor
2Park / Daytime running lamps
3Exterior lighting module 4
4Exterior lighting module 7
5Headlamp level
6-
7Electronic brake control module
8Washer pump
9-
10-
11-
12Horn
13Front wiper
14Exterior lighting module 6
15Exterior lighting module 1
16Exterior lighting module 5
17Exterior lighting module 3
18Aero shutter
19-
20-
21Virtual key system / Power sounder module
22Engine control module
23Transmission control module / Transmission reverse lock out
24Active engine mount
25-
26Engine control module
27Injectors / Ignition 2
28Charged air cooler
29Transmission aux oil pump / Transmission reverse lock out
30Injectors / Ignition 1
31Emissions 1
32Emissions 2
33Starter solenoid
34-
35-
36Starter pinion
37AC clutch
38-
39-
40-
41-
42Water pump
43-
44-
Relays
47-
48Front wiper speed
49Front wiper control
51-
52Engine control module
53Starter solenoid
54Starter pinion
55-
57AC clutch
58-
Instrument Panel Fuse Block

Cadillac CT4 (2021): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2021)
Usage
1-
2HVAC blower
3-
4-
5Theft deterrent / Universal garage door opener / Overhead console / Rain sensor
6-
7Air quality ionizer
8Heated steering wheel
9-
10Electronic steering column lock 1
11-
12-
13-
14-
15-
16-
17-
18Display / Infotainment / USB / Multi-function control module
19Airbag / Automatic occupant sensing / Data link connection / Wireless charging module / Virtual key module
20Power steering column module / Electronic steering column lock 2
21Driver monitor system / Performance data recorder
22-
23-
24-
25USB
26-
27-
28-
29-
30-
31Headlamp level
32-
33Body ignition / IP ignition
34Exhaust valve
35Transmission control module ignition / Engine control module ignition / Shift ignition / Brake ignition
36Shift module
37Body control module 1 / Electronic park brake switch
38Center stack module
39Steering wheel controls
40Body control module 2
41Body control module 3
42Body control module 4
Circuit Breakers
CB1Auxiliary power outlet 1
CB2Auxiliary power outlet 2
Relays
1Run after park / Accessory
2Run crank
3-
4-
5-
Rear Compartment Fuse Block

Cadillac CT4 (2021): Rear compartment fuse box diagram

List of fuses in the Rear Compartment Fuse Block (2021)
Usage
1Remote function actuator
2-
3Driver heated seat
4Fuel tank zone module
5-
6-
7-
8-
9-
10Motor seat belt passenger
11Canister vent solenoid
12Sunroof
13-
14-
15Passenger heated seat
16-
17Electronic suspension control
18-
19Motor seat belt driver
20Rear defog
21DC to DC transformer 2
22Driver power window / Door handle switch
23External object calculating module / Front camera module / High definition localization / Short range radar
24Passenger power window / Door handle switch
25-
26-
27Rear drive control module
28-
29-
30-
31DC to DC transformer 1
32Transfer case electronic control
33Central gateway module / Side blind zone alert
34Video processing module
35Hands free closure release
36Exterior lighting module 2
37Passenger memory seat module
38-
39Right front / Right rear window
40-
41-
42Amplifier
43Park assist module
44Driver memory seat module
45OnStar
46-
47-
48-
49-
50Driver seat
51Left front / Left rear window
52Passenger seat
Relays
53-
54-
55Run

2022

Engine Compartment Fuse Block

Cadillac CT4 (2022): Engine compartment fuse box diagram

List of fuses in the Engine Compartment Fuse Block (2022)
Usage
1Long Range Radar Front Sensor
2Park/Daytime Running Lamps
3Exterior Lighting Module 4
4Exterior Lighting Module 7
5Headlamp Level
6-
7Electronic Brake Control Module
8Washer Pump
9-
10-
11-
12Horn
13Front Wiper
14Exterior Lighting Module 6
15Exterior Lighting Module 1
16Exterior Lighting Module 5
17Exterior Lighting Module 3
18Aero Shutter
19-
20-
21Virtual Key System / Power Sounder Module
22Engine Control Module Battery
23Transmission Control Module
24Active Engine Mount
25-
26Engine Control Module
27Injectors / Ignition 2
28Charged Air Cooler
29Transmission Aux Oil Pump / Transmission Reverse Lock Out
30Injectors / Ignition 1
31Emissions 1
32Emissions 2
33Starter Solenoid
34-
35-
36Starter Pinion
37AC Clutch
38-
39-
40-
41-
42Water Pump
43-
44-
Relays
47-
48Front Wiper Speed
49Front Wiper Control
51-
52Engine Control Module
53Starter Solenoid
54Starter Pinion
55-
57AC Clutch
58-
Instrument Panel Fuse Block

Cadillac CT4 (2022): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2022)
Usage
1-
2Heating, Ventilation, and Air Conditioning Blower
3-
4-
5Theft Deterrent / Universal Garage Door Opener / Overhead Console / Rain Sensor
6-
7Air Quality Ionizer
8Heated Steering Wheel
9-
10Electronic Steering Column Lock 1
11-
12-
13-
14-
15-
16-
17-
18Display / Infotainment / USB / Multi-function Control Module
19Sensing and Diagnostic Module / Automatic Occupant Sensing / Data Link Connection / Wireless Charging Module / Virtual Key Module
20Power Steering Column Module / Electronic Steering Column Lock 2
21Driver Monitor System / Performance Data Recorder
22-
23-
24-
25USB
26-
27-
28-
29-
30-
31Headlamp Level
32-
33Body Ignition / IP Ignition
34Exhaust Valve
35Transmission Control Module Ignition / Engine Control Module Ignition / Shift Ignition / Brake Ignition
36Shift Module
37Body Control Module 1 / Electronic Park Brake Switch
38Center Stack Module
39Steering Wheel Controls
40Body Control Module 2
41Body Control Module 3
42Body Control Module 4
Circuit Breakers
CB1Auxiliary Power Outlet 1
CB2Auxiliary Power Outlet 2
Relays
1Run After Park / Accessory
2Run Crank
3-
4-
5-
Rear Compartment Fuse Block

Cadillac CT4 (2022): Rear compartment fuse box diagram

List of fuses in the Rear Compartment Fuse Block (2022)
Usage
1Remote Function Actuator
2-
3Driver Heated Seat
4Fuel Tank Zone Module
5-
6-
7-
8-
9-
10Motor Seat Belt Passenger
11Canister Vent Solenoid
12Sunroof
13-
14-
15Passenger Heated Seat
16-
17Electronic Suspension Control
18-
19Motor Seat Belt Driver
20Rear Defog
21DC to DC Transformer 2
22Driver Power Window / Door Handle Switch
23External Object Calculating Module / Front Camera Module / High Definition Localization Module / Short Range Radar
24Passenger Power Window / Door Handle Switch
25-
26Amplifier (V-Series Blackwing)
27Rear Drive Control Module
28-
29-
30-
31DC to DC Transformer 1
32Transfer Case Electronic Control
33Central Gateway Module / Side Blind Zone Alert
34Video Processing Module
35Hands Free Closure Release
36Exterior Lighting Module 2
37Passenger Memory Seat Module
38-
39Right Front / Right Rear Window
40-
41-
42Amplifier
43Park Assist Module
44Driver Memory Seat Module
45OnStar
46-
47-
48-
49-
50Driver Seat
51Left Front / Left Rear Window
52Passenger Seat
Relays
53-
54-
55Run

2023

Engine Compartment Fuse Block

Cadillac CT4 (2023): Engine compartment fuse box diagram

List of fuses in the Engine Compartment Fuse Block (2023)
Usage
1Long Range Radar Front Sensor
2Park / Daytime Running Lamps
3Exterior Lighting Module 4
4Exterior Lighting Module 7
5Headlamp Level
6-
7Electronic Brake Control Module
8Washer Pump
9-
10-
11-
12Horn
13Front Wiper
14Exterior Lighting Module 6
15Exterior Lighting Module 1
16Exterior Lighting Module 5
17Exterior Lighting Module 3
18Aero Shutter
19-
20-
21Virtual Key System / Power Sounder Module
22Engine Control Module Battery
23Transmission Control Module
24Active Engine Mount
25-
26Engine Control Module
27Injectors / lgnition 2
28Charged Air Cooler / Not Used
29Transmission Aux Oil Pump / Transmission Reverse Lock Out
30Injectors / lgnition 1
31Emissions 1
32Emissions 2
33Starter Solenoid
34-
35-
36Starter Pinion / Not Used
37AC Clutch
38-
39-
40-
41-
42Water Pump / Not Used
43-
44-
Relays
47-
48Front Wiper Speed / Not Used
49Front Wiper Control
51-
52Engine Control Module
53Starter Solenoid
54Starter Pinion / Not Used
55-
57AC Clutch
58-
Instrument Panel Fuse Block

Cadillac CT4 (2023): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2023)
Usage
1-
2Heating, Ventilation, and Air Conditioning Blower
3-
4-
5Theft Deterrent / Universal Garage Door Opener / Overhead Console / Rain Sensor
6-
7Air Quality Ionizer
8Heated Steering Wheel
9-
10Electronic Steering Column Lock 1
11-
12-
13-
14-
15-
16-
17-
18Display / lnfotainment / USB / Multi-function Control Module
19Sensing and Diagnostic Module / Automatic Occupant Sensing / Data Link Connection / Wireless Charging Module / Virtual Key Module
20Power Steering Column Module / Electronic Steering Column Lock 2
21Driver Monitor System / Performance Data Recorder
22-
23-
24-
25USB
26-
27-
28-
29-
30-
31Headlamp Level
32-
33Body Ignition / IP Ignition
34Exhaust Valve
35Transmission Control Module Ignition / Engine Control Module Ignition / Shift Ignition / Brake Ignition
36Shift Module
37Body Control Module 1 / Electronic Park Brake Switch
38Center Stack Module
39Steering Wheel Controls
40Body Control Module 2
41Body Control Module 3
42Body Control Module 4
Circuit Breakers
CB1Auxiliary Power Outlet 1
CB2Auxiliary Power Outlet 2
Relays
1Run After Park / Accessory
2Run Crank
3-
4-
5-
Rear Compartment Fuse Block

Cadillac CT4 (2023): Rear compartment fuse box diagram

List of fuses in the Rear Compartment Fuse Block (2023)
Usage
1Remote Function Actuator
2-
3Driver Heated Seat
4Fuel Tank Zone Module
5-
6-
7-
8-
9-
10Motor Seat Belt Passenger
11Canister Vent Solenoid
12Sunroof
13-
14-
15Passenger Heated Seat
16-
17Electronic Suspension Control
18-
19Motor Seat Belt Driver
20Rear Defog
21DC to DC Transformer 2
22Driver Power Window / Door Handle Switch
23External Object Calculating Module / Front Camera Module / High Definition Localization Module / Short Range Radar
24Passenger Power Window / Door Handle Switch
25-
26Amplifier (V-Series Blackwing)
27Rear Drive Control Module
28-
29-
30-
31DC to DC Transformer!
32Transfer Case Electronic Control
33Central Gateway Module / Side Blind Zone Alert
34Video Processing Module
35Hands Free Closure Release
36Exterior Lighting Module 2
37Passenger Memory Seat Module
38-
39Right Front / Right Rear Window
40-
41-
42Amplifier
43Park Assist Module
44Driver Memory Seat Module
45OnStar
46-
47-
48-
49-
50Driver Seat
51Left Front / Left Rear Window
52Passenger Seat
Relays
53-
54-
55Run

2024

Engine Compartment Fuse Block

Cadillac CT4 (2024): Engine compartment fuse box diagram

List of fuses in the Engine Compartment Fuse Block (2024)
Usage
1Long Range Radar Front Sensor
2Park / Daytime Running Lamps
3Exterior Lighting Module 4
4Exterior Lighting Module 7
5Headlamp Level
6-
7Electronic Brake Control Module
8Washer Pump
9-
10-
11-
12Horn
13Front Wiper
14Exterior Lighting Module 6
15Exterior Lighting Module 1
16Exterior Lighting Module 5
17Exterior Lighting Module 3
18Aero Shutter
19-
20-
21Virtual Key System / Power Sounder Module
22Engine Control Module Battery
23Transmission Control Module
24Active Engine Mount
25-
26Engine Control Module
27Injectors / lgnition 2
28Charged Air Cooler / Not Used
29Transmission Aux Oil Pump / Transmission Reverse Lock Out
30Injectors / lgnition 1
31Emissions 1
32Emissions 2
33Starter Solenoid
34-
35-
36Starter Pinion / Not Used
37AC Clutch
38-
39-
40-
41-
42Water Pump / Not Used
43-
44-
Relays
47-
48Front Wiper Speed / Not Used
49Front Wiper Control
51-
52Engine Control Module
53Starter Solenoid
54Starter Pinion / Not Used
55-
57AC Clutch
58-
Instrument Panel Fuse Block

Cadillac CT4 (2024): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2024)
Usage
1-
2Heating, Ventilation, and Air Conditioning Blower
3-
4-
5Theft Deterrent / Universal Garage Door Opener / Overhead Console / Rain Sensor
6-
7Air Quality Ionizer
8Heated Steering Wheel
9-
10Electronic Steering Column Lock 1
11-
12-
13-
14-
15-
16-
17-
18Display / lnfotainment / USB / Multi-function Control Module
19Sensing and Diagnostic Module / Automatic Occupant Sensing / Data Link Connection / Wireless Charging Module / Virtual Key Module
20Power Steering Column Module / Electronic Steering Column Lock 2
21Driver Monitor System / Performance Data Recorder
22-
23-
24-
25USB
26-
27-
28-
29-
30-
31Headlamp Level / Spare
32-
33Body Ignition / IP Ignition
34Exhaust Valve
35Transmission Control Module Ignition / Engine Control Module Ignition / Shift Ignition / Brake Ignition
36Shift Module
37Body Control Module 1 / Electronic Park Brake Switch
38Center Stack Module
39Steering Wheel Controls
40Body Control Module 2
41Body Control Module 3
42Body Control Module 4
Circuit Breakers
CB1Auxiliary Power Outlet 1
CB2Auxiliary Power Outlet 2
Relays
1Run After Park / Accessory
2Run Crank
3-
4-
5-
Rear Compartment Fuse Block

Cadillac CT4 (2024): Rear compartment fuse box diagram

List of fuses in the Rear Compartment Fuse Block (2024)
Usage
1Remote Function Actuator
2-
3Driver Heated Seat
4Fuel Tank Zone Module
5-
6-
7-
8-
9-
10Motor Seat Belt Passenger
11Canister Vent Solenoid
12Sunroof
13-
14-
15Passenger Heated Seat
16-
17Electronic Suspension Control
18-
19Motor Seat Belt Driver
20Rear Defog
21DC to DC Transformer 2
22Driver Power Window / Door Handle Switch
23External Object Calculating Module / Front Camera Module / High Definition Localization Module / Short Range Radar
24Passenger Power Window / Door Handle Switch
25-
26Amplifier (V-Series Blackwing)
27Rear Drive Control Module
28-
29-
30-
31DC to DC Transformer 1
32Transfer Case Electronic Control
33Central Gateway Module / Side Blind Zone Alert
34Video Processing Module
35Hands Free Closure Release
36Exterior Lighting Module 2
37Passenger Memory Seat Module
38-
39Right Front / Right Rear Window
40-
41-
42Amplifier
43Park Assist Module
44Driver Memory Seat Module
45OnStar
46-
47-
48-
49-
50Driver Seat
51Left Front / Left Rear Window
52Passenger Seat
Relays
53-
54-
55Run