The Cadillac CT4, produced from 2020 to 2022, is a compact luxury sedan known for its dynamic performance, modern design, and advanced technology features. Its electrical system, which includes the fuse box and relay components, plays a crucial role in ensuring the vehicle’s functionality and reliability.
The fuse box in the Cadillac CT4 from 2020 to 2022 houses various fuses designed to protect specific electrical circuits throughout the vehicle. These circuits power essential components such as the engine control module, lighting systems, infotainment features, climate control, and more. Fuses are critical as they interrupt the electrical flow in case of an overload or short circuit, preventing damage to sensitive components.
Relays in the Cadillac CT4 act as electrically operated switches that control high-current circuits. They facilitate the precise activation and deactivation of functions like the starter motor, fuel pump, air conditioning compressor, and power windows or seats. Efficient management of power distribution by relays contributes significantly to the vehicle’s overall performance and reliability.
Regular inspection and maintenance of the fuse box and relays are necessary to ensure the Cadillac CT4 from 2020 to 2022 operates smoothly. This includes checking fuses for signs of wear or damage, ensuring secure relay connections, and promptly addressing any electrical issues that arise. Proper care of these components helps maintain the vehicle’s electrical integrity, enhancing safety and driving satisfaction for owners of the Cadillac CT4 from 2020 to 2022.
MUST READ: DYI – How to Check Car Fuses?
(2020-2022) Cadillac CT4 fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Cadillac CT4 2020-2022 fuse assignment
- Cigar lighter (power outlet) fuses in the Cadillac CT4 are the Circuit Breakers CB1 and CB2 in the Instrument panel fuse box.
Year of production: 2020, 2021, 2022
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.
Engine compartment
The engine compartment fuse block is on the driver’s side of the engine compartment. Lift the cover to access the fuses.
Luggage compartment
The rear compartment fuse block is behind a cover on the driver side of the rear compartment.
Fuse Box Diagrams
Passenger compartment
Assignment of the fuses in the instrument panel (2020, 2021, 2022)
| № | 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
Assignment of the fuses and relays in the engine compartment (2020, 2021, 2022)
| № | 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
Assignment of the fuses and relays in the trunk (2020, 2021, 2022)
| № | 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 |
Conclusion
For owners and enthusiasts of classic Cadillac CT4 2020-2022, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Cadillac’s craftsmanship and innovation in the automotive industry during that era.
