Cadillac CT4 (2020 – 2022) – fuse box diagram
Year of production: 2020, 2021, 2022
Passenger compartment fuse block
The instrument panel fuse block is at the end of the driver side of the instrument panel.
| № | Description |
|---|---|
| 1 | Not Used |
| 2 | HVAC blower |
| 3 | Not Used |
| 4 | Not Used |
| 5 | Theft deterrent/ Universal garage door opener |
| 6 | Not Used |
| 7 | 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: 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 | 2021-2022: 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
The engine compartment fuse block is on the driver’s side of the engine compartment.
| № | Description |
|---|---|
| 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 | 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 | Virtual key system/ 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 | 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
The rear compartment fuse block is behind a cover on the driver side of the rear compartment.
| № | 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 |
| F71 | — |
| F72 | — |
| F73 | — |
| Relays | Usage |
| R1 | Rear seat power outlet relay |
| R2 | Fuel pump relay |
| R3 | Run/Crank relay |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.