Replacing blown fuse: Cadillac CT4 2020 Fuses Diagram
Fuse boxes are an important part of the Cadillac CT4 2020 because they cover many electrical parts inside the car. These small but necessary parts, which are located in the fuse box, protect against electrical overloads or faults that could harm sensitive systems. There are several fuses in the fuse box, which is usually easy to get to, like in the kick panel on the driver’s side or under the hood. Each fuse is responsible for a different circuit. These circuits can have important features like audio systems, lighting, power windows, and more. A fuse diagram is included to help owners find the right fuse for each component, making it easier to fix problems quickly and effectively in case of an electrical problem. Knowing how the fuse box is organized and what each fuse does is very important for keeping the Cadillac CT4 2020’s electrical system in good shape and making sure all of its systems work without any problems.
2024 Cadillac CT4 V-SERIES Specs, Price, Features, Mileage And Review
Electrical System
Electrical System Overload
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.
Replace a bad fuse with a new one of identical size and rating.
If there is a problem on the road and a fuse needs to be replaced, the same amperage fuse can be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible.
Headlamp Wiring
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.
Windshield Wipers
If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart.
Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage. Always clear ice and heavy snow from the windshield before using the windshield wipers.
If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of damage caused by electrical problems.
Danger
Fuses and circuit breakers are marked with their ampere rating. Do not exceed the specified amperage rating when replacing fuses and circuit breakers. The use of an oversized fuse or circuit breaker can result in a vehicle fire. You and others could be seriously injured or killed.
To check a fuse, look at the silver-coloured 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. Replace the fuse as soon as possible.
Engine Compartment Fuse Block
The engine compartment fuse block is on the driver’s side of the engine compartment.
Lift the fuse block cover to access the fuses. The vehicle may not be equipped with all of the fuses and relays shown.
Caution
Spilling liquid on any electrical component of the vehicle may damage it. Always keep the covers on any electrical component.
| Fuses | 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 | Usage |
| 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
The instrument panel fuse block is at 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.
To install the end cover, insert the tabs on the back of the cover into the slots in the instrument panel at the points shown. Align the clips with the slots in the instrument panel, and press the cover into place. The vehicle may not be equipped with all of the fuses and relays shown.
| Fuses | 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 | Usage |
| CB1 | Auxiliary power outlet 1 |
| CB2 | Auxiliary power outlet 2 |
| Relays | Usage |
| 1 | Run after park/ Accessory |
| 2 | Run crank |
| 3 | – |
| 4 | – |
| 5 | – |
Rear Compartment Fuse Block
The rear compartment fuse block is behind a cover on the driver’s side of the rear compartment.
2024 Cadillac CT4 V-SERIES Specs, Price, Features, Mileage And Review
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | 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 | Usage |
| 53 | – |
| 54 | – |
| 55 | Run |
FAQs
A fuse in a Cadillac CT4 2020 protects electrical circuits from overloading and potential damage by breaking the circuit when excessive current flows.
The fuse box in a Cadillac CT4 2020 is typically located in the engine compartment or under the dashboard on the driver’s side.
To access the fuse box, you may need to remove a cover panel either in the engine compartment or under the dashboard.
Common tools for accessing the fuse box may include a screwdriver, socket wrench, or panel removal tool.
A blown fuse will have a broken wire visible through the transparent casing or a visibly burned appearance.
Replace the blown fuse with one of the same amperage rating to restore functionality to the circuit.
Common electrical components protected by fuses may include headlights, interior lights, power windows, radio, and air conditioning systems.
No, it is not recommended to use a higher amperage fuse as it can lead to damage to the electrical components or even fire hazards.
Using a lower amperage fuse can cause it to blow prematurely and may indicate an underlying issue with the circuit.
Fuses do not typically reset once they have been tripped; they must be replaced.
The correct amperage rating for a replacement fuse should match the rating stamped on the original fuse or as specified in the vehicle’s owner’s manual.
Some vehicles may come with spare fuses stored in the fuse box or a compartment within the vehicle.
It depends on the function of the circuit affected by the blown fuse. Some functions may be non-essential for driving, while others may impact vehicle operation.
It’s a good idea to check the fuses periodically or whenever you experience electrical issues in the vehicle.
Useful Link:
View full PDF: Cadillac CT4 2020 User Manual | Auto User Guide
2024 Cadillac CT4 V-SERIES Specs, Price, Features, Mileage And Review