Cadillac CT4 (2020 – 2026) Fuse Box Diagrams & Location
Find complete Cadillac CT4 (2020–2026) Fuse Box Location & Diagrams with easy-to-follow fuse box locations, detailed layout diagrams, and fuse assignments. Whether you’re diagnosing an electrical fault, replacing a blown fuse, or identifying a circuit, this guide helps you maintain your Cadillac CT4 with confidence.
Fuse Box Location
Passenger Compartment Fuse Box
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.
Engine Compartment Fuse Box
The engine compartment fuse block is on the driver’s side of the engine compartment. Lift the cover to access the fuses.
Luggage Compartment Fuse Box
The rear compartment fuse block is behind a cover on the driver side of the rear compartment.
Fuse Box Diagrams
Passenger Compartment Fuse Box
| № | Description |
|---|---|
| 1 | Not Used |
| 2 | Heating, Ventilation, and Air Conditioning Blower |
| 3 | Not Used |
| 4 | Not Used |
| 5 | 2020-2021: Theft deterrent/ Universal garage door opener 2022-2026: Rain/Theft Deterrent/ Over Head Console/ Universal Garage Door Opener |
| 6 | Not Used |
| 7 | 2020-2025: Air quality ionizer |
| 8 | Heated steering wheel |
| 9 | Not Used |
| 10 | Electronic steering column lock 1 |
| 11 | Not Used |
| 12 | Not Used |
| 13 | Not Used |
| 14 | Not Used |
| 15 | Not Used |
| 16 | Not Used |
| 17 | Not Used |
| 18 | Display/ Infotainment/ USB/ CSM |
| 19 | 2020-2021: Airbag/Automatic occupant sensing/ Data link connection/ Wireless charging module 2022-2026: Sensing and Diagnostic Module/ Automatic Occupant Sensing/ Data Link Connection/ Wireless Charging Module/ Virtual Key Module |
| 20 | Power steering column module/ Electronic steering column lock 2 |
| 21 | 2021-2026: Driver monitor system/ Performance data recorder |
| 22 | Not Used |
| 23 | Not Used |
| 24 | Not Used |
| 25 | USB |
| 26 | Not Used |
| 27 | Not Used |
| 28 | Not Used |
| 29 | Not Used |
| 30 | Not Used |
| 31 | Headlamp level |
| 32 | Not Used |
| 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 |
| CB1 | Auxiliary power outlet 1 (Circuit Breaker) |
| CB2 | Auxiliary power outlet 2 (Circuit Breaker) |
| Relays | |
| 1 | Run after park/ Accessory |
| 2 | Run crank |
| 3 | Not Used |
| 4 | Not Used |
| 5 | Not Used |
Engine Compartment Fuse Box
| № | Description |
|---|---|
| 1 | Long range radar front sensor |
| 2 | 2020-2025: Park/Daytime running lamps |
| 3 | Exterior lighting module 4 |
| 4 | Exterior lighting module 7 |
| 5 | Headlamp level |
| 6 | Not Used |
| 7 | Electronic brake control module |
| 8 | Washer pump |
| 9 | Not Used |
| 10 | Not Used |
| 11 | Not Used |
| 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 | Not Used |
| 20 | Not Used |
| 21 | 2020-2025: Virtual key system/ Power sounder module 2026: Automatic Light Module/ Power Sounder Module |
| 22 | Engine control module |
| 23 | Transmission control module/Transmission reverse lock out |
| 24 | Active engine mount |
| 25 | Not Used |
| 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 | Not Used |
| 35 | Not Used |
| 36 | Starter pinion |
| 37 | 2020-2025: AC clutch |
| 38 | Not Used |
| 39 | Not Used |
| 40 | Not Used |
| 41 | Not Used |
| 42 | Water pump |
| 43 | Not Used |
| 44 | Not Used |
| Relays | |
| 47 | Not Used |
| 48 | Front wiper speed |
| 49 | Front wiper control |
| 51 | Not Used |
| 52 | Engine control module |
| 53 | Starter solenoid |
| 54 | Starter pinion |
| 55 | Not Used |
| 57 | AC clutch |
| 58 | Not Used |
Luggage Compartment Fuse Box
| № | Description |
|---|---|
| 1 | Remote function actuator |
| 2 | Not Used |
| 3 | Driver heated seat |
| 4 | Fuel tank zone module |
| 5 | Not Used |
| 6 | Not Used |
| 7 | Not Used |
| 8 | Not Used |
| 9 | Not Used |
| 10 | Motor seat belt passenger |
| 11 | Canister vent solenoid |
| 12 | Sunroof |
| 13 | Not Used |
| 14 | Not Used |
| 15 | Passenger heated seat |
| 16 | Not Used |
| 17 | Electronic suspension control |
| 18 | Not Used |
| 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/High definition localization/Short range radar |
| 24 | Passenger window door lock switch |
| 25 | Not Used |
| 26 | Amplifier (V-series) |
| 27 | Rear drive control module |
| 28 | Not Used |
| 29 | Not Used |
| 30 | Not Used |
| 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 | Not Used |
| 39 | Right front/ Right rear window |
| 40 | Not Used |
| 41 | Not Used |
| 42 | Amplifier |
| 43 | Park assist module |
| 44 | Driver memory seat module |
| 45 | OnStar |
| 46 | Not Used |
| 47 | Not Used |
| 48 | Not Used |
| 49 | Not Used |
| 50 | Driver seat |
| 51 | Left front/Left rear window |
| 52 | Passenger seat |
| Relays | |
| 53 | Not Used |
| 54 | Not Used |
| 55 | Run |
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