Fuse Diagrams: 2021 Cadillac XT4 Fuses and Relay Guide
Fuse boxes are an important part of the Cadillac XT4 2021’s electrical system because they keep everything safe and working right. Fuses are safety devices that stop the flow of electricity in the event of a circuit overload or short circuit. This keeps the vehicle’s electrical system from getting damaged or starting a fire. The fuse box, which is usually placed in an easy-to-reach spot inside the car or the engine bay, holds these fuses and makes it easy to check on them and replace them. It is important to understand the fuse box diagram to find the specific fuses that go with the different electrical systems or parts in the Cadillac XT4. This diagram usually has labels or symbols that show what each fuse is for and how much current it can handle. This makes troubleshooting and maintenance chores go more quickly. With the help of the fuse box diagram, Cadillac XT4 drivers can quickly fix electrical problems and keep their cars running at their best.
2023 Cadillac XT4 Specs, Price, Features, Mileage And Torque (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 the 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.
Warning
Installation or use of fuses that do not meet GM’s original fuse specifications is dangerous. The fuses could fail, and result in a fire. You or others could be injured or killed, and the vehicle could be damaged.
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 underhood fuse block is in the engine compartment, on the driver’s side of the vehicle.
Caution
Do not pull the engine compartment fuse block lever, since it is intended only for service purposes. If pulled, vehicle malfunction may occur.
Caution
Spilling liquid on any electrical component of the vehicle may damage it. Always keep the covers on any electrical component.
To remove the fuse block cover, press the clips on the cover and lift it straight up.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| 3 | Electronic brake control module |
| 5 | Trailer brake |
| 6 | Rear closure |
| 7 | Trailer Stop/Turn LH |
| 8 | Memory seat module |
| 9 | Pedestrian-friendly alert function |
| 10 | Semi-active damping system |
| 11 | DC-DC Battery 1/2 |
| 12 | Rear defogger |
| 13 | Heated mirror |
| 14 | – |
| 15 | Passive entry passive start |
| 16 | Front wiper |
| 17 | Passenger power seat |
| 18 | Power liftgate module |
| 19 | Driver power seat |
| 21 | Sunroof |
| 22 | Rear wiper |
| 23 | Trailer Interface Module 2 |
| 26 | Transmission control module/Ignition |
| 27 | Instrument panel body/ Ignition |
| 28 | Rear wiper |
| 29 | Trailer ignition |
| 30 | Malfunction indicator lamp start/stop Trailer interface module ignition |
| 32 | Rear drive control module 1 |
| 33 | – |
| 34 | Handsfree/Window switch |
| 35 | Diesel exhaust fuel heater |
| 36 | Fuel module |
| 39 | Massage |
| 40 | Steering column lock |
| 41 | – |
| 43 | Heated steering wheel |
| 44 | Seat ventilation/Front heated seat |
| 46 | Engine control module/ Ignition |
| 48 | Rear drive control module 2 |
| 49 | Heating Ventilation/Air conditioning blower motor |
| 50 | – |
| 51 | – |
| 54 | – |
| 55 | – |
| 56 | Starter motor |
| 57 | – |
| 58 | – |
| 59 | High beam headlamps left/right |
| 60 | Trailer Interface Module 1 |
| 61 | – |
| 62 | – |
| 63 | – |
| 65 | Air conditioning control |
| 67 | – |
| 68 | – |
| 69 | – |
| 70 | Trailer park lamp |
| 72 | Starter pinion |
| 75 | Engine control module main |
| 76 | Powertrain off engine |
| 78 | Horn |
| 79 | Washer pump |
| 81 | Transmission control module/Engine control module/Cooling pump |
| 82 | Nitrogen oxide sensor |
| 83 | Ignition coil |
| 84 | Powertrain on engine |
| 85 | Shunt |
| 86 | – |
| 87 | Diesel fuel heater 1 |
| 88 | Aeroshutter |
| 89 | Selective catalytic reduction module |
| 92 | Trailer Stop/Turn right |
| 93 | Automatic headlamp leveling/Canister vent solenoid |
| 95 | Smart sensors |
| 96 | Diesel fuel heater 2 |
| 99 | – |
| Relays | Usage |
| 4 | – |
| 20 | Rear defogger |
| 25 | Front wiper control |
| 31 | Run/Crank |
| 37 | Front wiper speed |
| 42 | – |
| 64 | Starter motor |
| 66 | Powertrain |
| 71 | Trailer park lamp |
| 73 | Air conditioning control |
| 80 | Starter pinion |
| 90 | Powertrain sensor |
| 94 | Diesel exhaust fuel heater |
| 98 | Diesel fuel heater |
Instrument Panel Fuse Block
The instrument panel fuse block is on the driver’s side of the instrument panel, between the steering wheel and the door. To access the fuses, remove the panel, starting at the top. Once clips are disengaged, the tabs along the bottom of the door can be disengaged from the instrument panel to remove the door.
2023 Cadillac XT4 Specs, Price, Features, Mileage And Torque (Review)
To reinstall the door, place the bottom tabs into the slots, and rotate the door into position, engaging the clips.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| F1 | Left power window |
| F2 | Right power window |
| F3 | – |
| F4 | DC-DC battery 2/1 |
| F5 | Auxiliary power outlet – cargo |
| F6 | Heated seat battery 1 |
| F7 | Heated seat battery 2 |
| F8 | Body control module 3 |
| F9 | Electric parking brake switch |
| F10 | Body control module 2 (Stop/Start) |
| F11 | – |
| F12 | – |
| F13 | – |
| F14 | – |
| F15 | Transmission control module (Stop/Start) |
| F16 | Amplifier |
| F17 | – |
| F18 | Video processing module |
| F19 | Power steering column |
| F20 | Body Control Module 6 |
| F21 | Body control module 4 |
| F22 | Body Control Module 7 |
| F23 | Electric steering column lock |
| F24 | Airbag |
| F25 | Data link connector |
| F26 | – |
| F27 | – |
| F28 | – |
| F29 | Body Control Module 8 |
| F30 | Overhead console |
| F31 | Steering wheel control |
| F32 | – |
| F33 | Heating Ventilation/Air conditioning |
| F34 | Central gateway module |
| F35 | Heated switch |
| F36 | Charger |
| F37 | Auxiliary power outlet – front |
| F38 | OnStar |
| F39 | Display |
| F40 | Obstacle detection |
| F41 | Body control module 1 (Stop/Start) |
| F42 | Radio |
| F43 | Auxiliary power outlet – console (circuit breaker) |
| F44 | Auxiliary power outlet – console |
| Relay | Usage |
| K1 | – |
| K2 | Retained accessory power |
| K3 | Content theft |
| K4 | – |
| K5 | – |
FAQs
There’s no specific order, but it’s a good practice to replace blown fuses as soon as possible to ensure the proper functioning of your vehicle’s electrical systems.
It’s not advisable to drive with a blown fuse, especially if it affects critical systems like headlights or brake lights. Doing so could compromise your safety and potentially lead to further damage.
Replacing a fuse usually takes just a few minutes once you’ve located the fuse box and identified the blown fuse.
While blown fuses can occur due to various reasons, ensuring that electrical components are not overloaded and keeping the vehicle’s electrical system well-maintained can help minimize the likelihood of blown fuses.
If replacing the fuse doesn’t resolve the issue, there may be a deeper electrical problem that requires professional diagnosis and repair.
Before working on the fuse box, ensure that the vehicle’s ignition is turned off to prevent electrical shocks. Additionally, use caution when handling fuses and ensure that the correct replacement fuse is used.
Replacing a fuse is a relatively simple task that most vehicle owners can do themselves. However, if you’re uncomfortable or unsure, it’s always best to consult a professional.
The fuse box diagram will typically be labeled with numbers or symbols corresponding to different electrical components or systems in your vehicle. Refer to the diagram to identify which fuse needs to be replaced
Issues such as a malfunctioning radio, power windows not working, or dashboard lights not functioning can often be attributed to blown fuses.
No, it’s essential to replace a blown fuse with one that has the same rating (amperage) as the original. Using a fuse with a different rating can cause electrical problems or even damage to your vehicle.
Visually inspect the fuse to see if the metal strip inside is intact. If it’s broken or burnt, the fuse needs to be replaced.
Typically, you’ll only need a pair of needle-nose pliers or a fuse puller, which is often provided in the fuse box itself.
The fuse box in a 2021 Cadillac XT4 is typically located in the engine compartment or under the dashboard on the driver’s side. Refer to your vehicle’s manual for the exact location.
Knowing how to replace fuses is essential for maintaining the electrical functionality of your vehicle. Fuses protect electrical circuits from overloads, and when a fuse blows, it needs to be replaced to restore functionality.
A fuse box diagram is a schematic representation that shows the layout and labeling of the fuses within a vehicle’s fuse box. It indicates which fuse corresponds to which electrical component or system.
Useful Link:
View full PDF: Cadillac XT4 2021 User Manual | Auto User Guide
2023 Cadillac XT4 Specs, Price, Features, Mileage And Torque (Review)