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.
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.
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.
Rear Compartment Fuse Block: The rear compartment fuse block is behind a cover on the driver side of the rear compartment.
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
List of fuses in the Engine Compartment Fuse Block (2020)
№
Usage
1
Long range radar front sensor
2
Park / Daytime running lamps
3
Exterior lighting module 4
4
Exterior lighting module 7
5
Headlamp level
6
-
7
Electronic brake control module
8
Washer pump
9
-
10
-
11
-
12
Horn
13
Front wiper
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
-
23
Transmission control module
24
Active engine mount
25
-
26
Engine control module
27
Injectors / Ignition 2
28
Charged air cooler
29
Transmission coolant pump
30
Injectors / Ignition 1
31
Emissions 1
32
Emissions 2
33
Starter solenoid
34
-
35
Coolant pump
36
Starter pinion
37
AC clutch
38
-
39
-
40
-
41
-
42
Water pump
43
-
44
-
Relays
47
-
48
Front wiper speed
49
Front wiper control
51
-
52
Engine control module
53
Starter solenoid
54
Starter pinion
55
-
57
AC clutch
58
-
Instrument Panel Fuse Block
List of fuses in the Instrument Panel Fuse Block (2020)
№
Usage
1
-
2
HVAC blower
3
-
4
-
5
Theft deterrent / Universal garage door opener
6
-
7
Air quality ionizer
8
Heated steering wheel
9
-
10
Electronic steering column lock 1
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
Display / Infotainment/USB
19
Airbag / Automatic occupant sensing / Data link connection / Wireless charging module
20
Power steering column module / Electronic steering column lock 2
21
-
22
-
23
-
24
-
25
USB
26
-
27
-
28
-
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
CB1
Auxiliary power outlet 1
CB2
Auxiliary power outlet 2
Relays
1
Run after park / Accessory
2
Run crank
3
-
4
-
5
-
Rear Compartment Fuse Block
List of fuses in the Rear Compartment Fuse Block (2020)
№
Usage
1
Remote function actuator
2
Engine control module
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
-
17
Electronic suspension control
18
-
19
Motor seat belt driver
20
Rear defog
21
DC to DC transformer 2
22
Driver power window door lock switch
23
External object calculating module / Front camera module
24
Passenger window door lock switch
25
-
26
Trailer
27
Rear drive control module
28
-
29
-
30
-
31
DC to DC transformer 1
32
Transfer case electronic control
33
Central gateway module / Side blind zone alert
34
Video processing module
35
Hands free closure release
36
Exterior lighting module 2
37
Passenger memory seat module
38
Trailer 2
39
Right front / Right rear window
40
-
41
-
42
Amplifier
43
Park assist module
44
Driver memory seat module
45
OnStar
46
-
47
-
48
-
49
Trailer
50
Driver seat
51
Left front / Left rear window
52
Passenger seat
Relays
53
-
54
-
55
Run
2021
Engine Compartment Fuse Block
List of fuses in the Engine Compartment Fuse Block (2021)
№
Usage
1
Long range radar front sensor
2
Park / Daytime running lamps
3
Exterior lighting module 4
4
Exterior lighting module 7
5
Headlamp level
6
-
7
Electronic brake control module
8
Washer pump
9
-
10
-
11
-
12
Horn
13
Front wiper
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
23
Transmission control module / Transmission reverse lock out
24
Active engine mount
25
-
26
Engine control module
27
Injectors / Ignition 2
28
Charged air cooler
29
Transmission aux oil pump / Transmission reverse lock out
30
Injectors / Ignition 1
31
Emissions 1
32
Emissions 2
33
Starter solenoid
34
-
35
-
36
Starter pinion
37
AC clutch
38
-
39
-
40
-
41
-
42
Water pump
43
-
44
-
Relays
47
-
48
Front wiper speed
49
Front wiper control
51
-
52
Engine control module
53
Starter solenoid
54
Starter pinion
55
-
57
AC clutch
58
-
Instrument Panel Fuse Block
List of fuses in the Instrument Panel Fuse Block (2021)