Fixing a blown fuse: Cadillac CT6 2020 Fuse Diagram and Details
A blown fuse is often to blame when there are electricity problems in a car like the Cadillac CT6 2020. Fuses are very important parts of electrical systems because they keep them from getting damaged by too much current flow. When a fuse blows, it breaks the circuit and stops the damage from getting worse in the car’s electrical system. To fix this problem, you need to quickly find the blown fuse and replace it. The Cadillac CT6 2020 comes with a fuse box that holds different fuses, each one connected to a different part of the car. It is very important to look at the fuse diagram in the owner’s instructions or, more often, on the cover of the fuse box to find the fuse that is causing the problem. Once the blown fuse is found, it can be carefully taken out with fuse pullers or tools, and a new fuse with the right amperage can be put in its place. This easy step-by-step process helps make sure that the car’s electrical parts work properly, restoring usefulness and keeping the car’s best performance on the road.
2023 Cadillac CT4 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 electrical load is too heavy a circuit breaker opens, protecting the circuit until overcurrent condition is removed. This greatly reduces the chance of circuit overload and fire caused by electrical problems. Fuses and circuit breakers protect electrical devices in the vehicle. Replace a blown or open 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. The wiper function is available immediately after the wiper switch is set to off, and back to on.
To protect the wiper motor from overheating, the wipers may slow down when the windshield is dry for a long period. If a period of dry operation, or little moisture, exceeds 10 minutes, the wipers may switch to intermittent operation, and remain there. When moisture is again detected on the windshield, wiper operation will return to the operator-selected speed.
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
3.6L Engines
This 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 | – |
| 2 | – |
| 3 | – |
| 4 | – |
| 5 | Transfer case control/Transmission control module ignition |
| 6 | – |
| 7 | Starter motor |
| 8 | Starter pinion |
| 9 | Horn |
| 10 | – |
| 11 | – |
| 12 | – |
| 13 | High beam headlamps left/right |
| 18 | Right cornering LED |
| 21 | Air conditioning clutch |
| 22 | Transmission auxiliary oil pump cooling |
| 23 | – |
| 24 | Cabin heater pump |
| 26 | Engine control module ignition |
| 27 | Steering column lock ignition |
| 28 | Rear heated seat ignition |
| 29 | Front heated seat ignition |
| 30 | – |
| 31 | Headlamp/Daytime running lamps/Right headlamp |
| 32 | – |
| 33 | – |
| 34 | – |
| 35 | Engine control module ignition – 2 |
| 36 | Engine control module ignition – 1 |
| 37 | Coolant pump/ Ignition coils – odd |
| 38 | Ignition coils – even/Non-walk 2 |
| 39 | Non-walk |
| 40 | Electric brake control module1/Instrument cluster/central gateway module ignition |
| 41 | – |
| 42 | Fuel tank zone module/Ignition |
| 43 | Heated steering wheel module/ Reflective light aux display/HVAC IGN/ Automatic occupant sensing display |
| 44 | Aeroshutter |
| 45 | Washer |
| 46 | Front short-range radar sensors |
| 47 | Left cornering LED |
| 54 | – |
| 55 | – |
| 56 | – |
| 57 | – |
| 58 | – |
| 59 | – |
| 60 | Antilock brake system pump/Electric brake control module – 1 |
| 61 | Front wiper |
| 62 | Headlamp leveling |
| 63 | – |
| 64 | – |
| 66 | Transfer case control module |
| 67 | – |
| 68 | – |
| 69 | – |
| 70 | – |
| 71 | Antilock brake system valve |
| 72 | – |
| 73 | – |
| Relays | Usage |
| 14 | Air conditioning control |
| 15 | Starter motor |
| 16 | Starter pinion |
| 17 | Run/Crank |
| 19 | – |
| 20 | High beam headlamp |
| 25 | Cabin heater pump |
| 48 | – |
| 49 | – |
| 50 | Engine control module |
| 51 | Wiper speed |
| 52 | Wiper control |
| 53 | Headlamp control |
| 65 | – |
4.2L Engine
The 4.2L engine has an underhood fuse block on each 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 |
| F1 | – |
| F2 | – |
| F3 | – |
| F4 | – |
| F5 | High beam headlamps left/right |
| F6 | – |
| F7 | Front wiper |
| F8 | – |
| F9 | Instrument cluster/ Electric brake control module 1/Central gateway module ignition |
| F10 | – |
| F11 | Transmission control/Transfer case control module ignition |
| F12 | – |
| F13 | Front heated seat ignition |
| F14 | Exhaust valve solenoid |
| F15 | Rear heated seat ignition |
| F16 | Fuel tank zone module ignition |
| F17 | – |
| F18 | – |
| F19 | – |
| F20 | – |
| F21 | Heated steering wheel module/ Reflective light aux display/HVAC IGN/ Automatic occupant sensing display |
| F22 | Electric steering column lock ignition |
| F23 | Washer |
| F24 | Left cornering LED |
| F25 | – |
| F26 | – |
| F27 | – |
| F28 | – |
| F29 | Electric brake control module – 1 |
| Relays | Usage |
| R1 | – |
| R2 | – |
| R3 | – |
| R4 | High beam headlamp |
| R5 | Wiper control |
| R6 | Wiper speed |
| R7 | Run/Crank |
| R8 | – |
The 8-cylinder engine has an underhood fuse block on each 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 |
| F1 | Electric brake control module – 2 |
| F2 | – |
| F3 | Headlamp/Daytime running lamps |
| F4 | Right cornering LED |
| F5 | – |
| F6 | Front short-range radar sensors |
| F7 | Horn |
| F8 | Air conditioning clutch |
| F9 | – |
| F10 | – |
| F11 | Automatic headlamp leveling |
| F12 | Starter motor |
| F13 | Starter pinion |
| F14 | – |
| F15 | – |
| F16 | – |
| F17 | Cabin heater pump |
| F18 | Transmission auxiliary oil pump cooling |
| F19 | Engine control module ignition |
| F20 | Non-walk |
| F21 | Ignition coils – even/ Non walk – 2 |
| F22 | Engine control module ignition – 1 |
| F23 | Transfer case control module |
| F24 | – |
| F25 | Ignition coils – odd |
| F26 | Charge air coolant pump |
| F27 | Engine control module ignition – 2 |
| F28 | – |
| F29 | – |
| Relays | Usage |
| R1 | Headlamp/Daytime running lamps |
| R2 | Air conditioning control |
| R3 | Starter motor |
| R4 | Starter pinion |
| R5 | Cabin heater pump |
| R6 | Engine control module |
| R7 | – |
| R8 | – |
Instrument Panel Fuse Block
The instrument panel fuse block is behind the driver-side instrument panel storage compartment
The storage compartment has a press to open the latch. To access the fuses, open the compartment by pressing and releasing near the top center square.
Apply pressure to the two retaining tabs on the sides of the compartment, until the two retaining tabs clear the sides of the instrument panel. Allow the compartment to move downward, and out of the way.
2023 Cadillac CT4 Specs, Price, Features, Mileage And Review
To reinstall the compartment, reverse the steps. The vehicle may not be equipped with all of the fuses shown.
| Fuses | Usage |
| F1 | Auxiliary power outlet front console |
| F2 | Visor |
| F3 | Front blower |
| F4 | Body Control Module 8 |
| F5 | Power steering column |
| F6 | Electric steering column lock |
| F7 | Glove box door |
| F8 | Front heated seat module |
| F9 | Sensing and diagnostic module |
| F10 | Body control module 4 |
| F11 | Body control module 3 |
| F12 | Data link connector |
| F13 | – |
| F14 | Electronic shifter |
| F15 | Front Camera |
| F16 | Display |
| F17 | Heating, ventilation, and air conditioning control |
| F18 | OnStar |
| F19 | – |
| F20 | – |
| F21 | – |
| F22 | – |
| F23 | Central gateway module |
| F24 | Center stack module/ Infotainment |
| F25 | Video processing module night vision |
| F26 | Steering wheel controls |
| F27 | USB charge port |
| F28 | Wireless charger |
| F29 | – |
| F30 | Speaker |
Rear Compartment Fuse Block
The rear compartment fuse block is behind a cover on the passenger side.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| F01 | – |
| F02 | Auxiliary trunk power outlet |
| F03 | Left window |
| F04 | – |
| F05 | Canister vent |
| F06 | Right rear memory seat |
| F07 | Body Control Module 7 |
| F08 | Passenger/Rear seat adjustment switch |
| F09 | Passive entry/Passive start battery |
| F10 | Rear subwoofer |
| F11 | Left front memory seat module |
| F12 | – |
| F13 | – |
| F14 | Rear seat memory/ Heated |
| F15 | Left front subwoofer |
| F16 | Right front memory seat |
| F17 | Rear heated seat |
| F18 | – |
| F19 | Driver passenger door window/Mirror/ Driver seat adjustment/Fuel door switch |
| F20 | Electric brake control module – 2 |
| F21 | – |
| F22 | – |
| F23 | Rear closure latch |
| F24 | – |
| F25 | Left front motorized seat belt pretensioner |
| F26 | Rear defogger |
| F27 | Right front subwoofer |
| F28 | Amplifier |
| F29 | Sunroof |
| F30 | Body control module 2 |
| F31 | Body Control Module 6 |
| F32 | Exterior heated mirrors |
| F33 | Right window |
| F34 | Power trunk module |
| F35 | – |
| F36 | – |
| F37 | – |
| F38 | Rear blower |
| F39 | Fuel pump power module/Fuel tank zone module |
| F40 | – |
| F41 | Rear seat auxiliary power outlet |
| F42 | Left rear memory seat |
| F43 | – |
| F44 | Rear closure release switch/Power trunk module/Integrated chassis control module battery |
| F45 | Auxiliary audio/Video |
| F46 | External object calculating module/ Side blind zone alert/ Rear center short-range radar sensor/Long-range radar sensors |
| F47 | – |
| F48 | – |
| F49 | Memory booster module |
| F50 | Body control module 1 |
| F51 | Transmission control module |
| F52 | Park Assist |
| F53 | Ventilated seats |
| F54 | Universal garage door opener/Power sounder module/Rain sensor |
| F55 | Front memory seat module VEHICLE CARE 335 |
| F56 | Evaporative emissions leak check module/Rear HVAC display |
| F57 | – |
| F58 | – |
| F59 | Engine control module battery |
| F60 | Right front motorized seat belt pretensioner |
| F61 | – |
| F62 | – |
| F63 | Rear seat infotainment module |
| F64 | Engine control module ignition |
| F65 | Rear window sunshade |
| F66 | Rear vision camera/ Rearview mirror |
| F67 | Run/Crank misc/Air quality sensor/ Integrated chassis control module/ Electronic shifter/DC-DC converter |
| F68 | Damping control module |
| F69 | Television tuner module |
| F70 | – |
| F71 | – |
| F72 | – |
| F73 | – |
| F74 | – |
| F75 | – |
| Relays | Usage |
| R1 | Rear seat auxiliary power outlet |
| R2 | Spare |
| R3 | Run/Crank |
| Fuses | Usage |
| F01 | – |
| F02 | Body control modules 2 and 4 |
| F03 | Left rear external object calculating module |
| F04 | Steering wheel display/Touch sensor |
| F05 | – |
| F06 | – |
| F07 | Left front and right rear short-range radar sensor/Camera image processing module |
| F08 | Driver memory seat module |
| F09 | Column friction device |
| F10 | Left headlamp |
| F11 | – |
| F12 | – |
| F13 | Left front subwoofer |
| F14 | Rear blower |
| F15 | Left window |
| F16 | Canister vent |
| F17 | Rear seat memory/ Heated |
| F18 | Rear subwoofer |
| F19 | Damping control module |
| F20 | – |
| F21 | Electric brake control module 2 |
| F22 | – |
| F23 | Left front motorized seat belt pretensioner |
| F24 | Body Control Module 7 |
| F25 | Passive entry/Passive start battery |
| F26 | Rear closure latch |
| F27 | Amplifier |
| F28 | Rear defogger |
| F29 | Park assist module |
| F30 | Body control module 1 |
| F31 | Driver monitoring system |
| F32 | Driver passenger door window/Mirror/ Driver seat adjustment/Fuel door switch |
| F33 | Passenger/Rear seat adjustment switch |
| F34 | Left front memory seat |
| F35 | Right rear memory seat |
| F36 | External heated mirror |
| F37 | – |
| F38 | Transmission control module |
| F39 | Rear seat infotainment module |
| F40 | – |
| F41 | – |
| F42 | – |
| F43 | Power trunk module |
| F44 | Right front memory seat |
| F45 | – |
| F46 | Right window |
| F47 | Engine control module battery |
| F48 | Right front subwoofer |
| F49 | Body Control Module 6 |
| F50 | – |
| F51 | – |
| F52 | Fuel pump power module/Fuel tank zone module |
| F53 | The rear seat auxiliary power outlet |
| F54 | Left rear memory seat |
| F55 | – |
| F56 | Rear closure release switch/Power trunk module |
| F57 | Rear left and rear center short-range radar sensors/Long range radar sensors/ Right rear external object calculating module |
| F58 | Auxiliary audio/Video |
| F59 | – |
| F60 | Memory booster module |
| F61 | – |
| F62 | Ventilated seat |
| F63 | Universal garage door opener/Power sounder module/Rain sensor |
| F64 | Passenger memory seat module |
| F65 | Right front short-range radar sensor/advanced driver assist map |
| F66 | Television tuner module |
| F67 | – |
| F68 | – |
| F69 | – |
| F70 | Right front motorized seat belt pretensioner |
| F71 | Rear heated seat module |
| F72 | Sunroof |
| F73 | Rear vision camera/ Rearview mirror/Air quality sensor |
| F74 | Rear window sunshade |
| F75 | Engine control module ignition |
| F76 | Misc run crank/ Energy storage control module/DC-DC converter/Rear external object calculating module |
| F77 | Trunk auxiliary power outlet |
| F78 | Rear HVAC display |
| F79 | – |
| F80 | – |
| F81 | – |
| F82 | – |
| F83 | – |
| F84 | – |
| F85 | – |
| F86 | – |
| F87 | – |
| Relays | Usage |
| R01 | Rear seat auxiliary power outlet |
| R02 | Spare |
| R03 | Run/Crank |
FAQs
A fuse is a safety device designed to protect electrical circuits from excessive current flow. It blows when there’s a short circuit or overloading.
The fuse box in a Cadillac CT6 2020 is typically located in the passenger compartment. It may be found in the glove compartment, under the dashboard, or on the side of the dashboard.
Usually, you can access the fuse box by opening the glove compartment and removing any panels or covers inside.
Typically, you’ll only need a pair of needle-nose pliers or fuse pullers to remove the blown fuse.
Look for a fuse with a broken wire or a visibly melted or charred appearance.
Always replace a blown fuse with one of the same amp rating. Using a higher-rated fuse can cause damage to your vehicle’s electrical system.
It’s not safe to substitute a fuse with a different amp rating. You should obtain the correct fuse before replacing the blown one.
No, using a higher-rated fuse can lead to electrical damage or even a fire hazard. Always replace with the correct amp rating.
You can typically find a fuse diagram in the owner’s manual of your vehicle. It might also be printed on the inside of the fuse box cover.
Use fuse pullers or needle-nose pliers to gently grasp the fuse and pull it straight out of its socket.
Simply insert the new fuse into the empty socket and push it in until it’s fully seated.
If the fuse blows again immediately, there may be a more serious underlying electrical issue. Consult a professional mechanic for further diagnosis and repair.
It’s not recommended to drive with a blown fuse, especially if it affects critical systems like headlights or brake lights.
If you’re unsure about replacing the fuse yourself, it’s best to consult a qualified automotive technician to avoid causing further damage to your vehicle.
Useful Link:
View full PDF: Cadillac CT6 2020 User Manual | Auto User Guide
2023 Cadillac CT4 Specs, Price, Features, Mileage And Review