Cadillac CT4 (2020-…) fuses and relays

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The compact executive sedan Cadillac CT4 is available from 2020 to the present. In this article, you will find fuse box diagrams of Cadillac CT4 2020, 2021, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Fuse Layout Cadillac CT4 2020, 2021

Cigar lighter (power outlet) fuses in the Cadillac CT4 are the Circuit Breakers CB1 and CB2 in the Instrument panel fuse box.

Fuse Box Location

Passenger compartment

The instrument panel fuse block is at the end of the driver side of the instrument panel. To access, remove the end cover by gently prying with a plastic tool near each clip, beginning at the point shown.
To install the cover, insert the tabs on the back of the cover into the slots in the instrument panel. Align the clips with the slots in the instrument panel, and press the cover into place.The location of the fuses in the passenger compartment: Cadillac CT4 (2020, 2021)

Engine compartment

The engine compartment fuse block is on the driver’s side of the engine compartment. Lift the cover to access the fuses.The location of the fuses in the engine compartment: Cadillac CT4 (2020, 2021)

Luggage compartment

The rear compartment fuse block is behind a cover on the driver side of the rear compartment.The location of the fuses in the trunk: Cadillac CT4 (2020, 2021)


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Fuse Box Diagrams

2020, 2021

Passenger compartment

Instrument panel fuse box diagram: Cadillac CT4 (2020, 2021)

Assignment of the fuses in the instrument panel (2020, 2021)
Description
1Not Used
2HVAC blower
3Not Used
4Not Used
5Theft deterrent/ Universal garage door opener
6Not Used
7Air quality ionizer
8Heated steering wheel
9Not Used
10Electronic steering column lock 1
11Not Used
12Not Used
13Not Used
14Not Used
15Not Used
16Not Used
17Not Used
18Display/ Infotainment/ USB/ CSM
19Airbag/Automatic occupant sensing/ Data link connection/ Wireless charging module
20Power steering column module/ Electronic steering column lock 2
21Not Used
22Not Used
23Not Used
24Not Used
25USB
26Not Used
27Not Used
28Not Used
29Not Used
30Not Used
31Headlamp level
32Not Used
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
CB1Auxiliary power outlet 1 (Circuit Breaker)
CB2Auxiliary power outlet 2 (Circuit Breaker)
Relays
1Run after park/ Accessory
2Run crank
3Not Used
4Not Used
5Not Used

Engine compartment

Under-hood fuse box diagram: Cadillac CT4 (2020, 2021)

Assignment of the fuses and relays in the engine compartment (2020, 2021)
Description
1Long range radar front sensor
2Park/Daytime running lamps
3Exterior lighting module 4
4Exterior lighting module 7
5Headlamp level
6Not Used
7Electronic brake control module
8Washer pump
9Not Used
10Not Used
11Not Used
12Horn
13Front wiper
14Exterior lighting module 6
15Exterior lighting module 1
16Exterior lighting module 5
17Exterior lighting module 3
18Aero shutter
19Not Used
20Not Used
21Virtual key system/ Power sounder module
22Engine control module
23Transmission control module/Transmission reverse lock out
24Active engine mount
25Not Used
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
34Not Used
35Not Used
36Starter pinion
37AC clutch
38Not Used
39Not Used
40Not Used
41Not Used
42Water pump
43Not Used
44Not Used
Relays
47Not Used
48Front wiper speed
49Front wiper control
51
52Engine control module
53Starter solenoid
54Starter pinion
55Not Used
57AC clutch
58Not Used

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Luggage compartment

Trunk fuse box diagram: Cadillac CT4 (2020, 2021)

Assignment of the fuses and relays in the trunk (2020, 2021)
Description
1Remote function actuator
2Not Used
3Driver heated seat
4Fuel tank zone module
5Not Used
6Not Used
7Not Used
8Not Used
9Not Used
10Motor seat belt passenger
11Canister vent solenoid
12Sunroof
13Not Used
14Not Used
15Passenger heated seat
16Not Used
17Electronic suspension control
18Not Used
19Motor seat belt driver
20Rear defog
21DC to DC transformer 2
22Driver power window door lock switch
23External object calculating module/ Front camera module/High definition localization/Short range radar
24Passenger window door lock switch
25Not Used
26Amplifier (V-series)
27Rear drive control module
28Not Used
29Not Used
30Not Used
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
38Not Used
39Right front/ Right rear window
40Not Used
41Not Used
42Amplifier
43Park assist module
44Driver memory seat module
45OnStar
46Not Used
47Not Used
48Not Used
49Not Used
50Driver seat
51Left front/Left rear window
52Passenger seat
Relays
53Not Used
54Not Used
55Run