Fixing a Blown Fuse: 2018 Cadillac CT6 Fuses and Fuse Box Diagram
Like all modern cars, the 2018 Cadillac CT6 has a complicated electrical system that powers many of the parts and systems that are needed for it to work. Most of the time, drivers will have problems with blown fuses, which can stop certain parts or systems in the car from working. Understanding how to find and fix a broken fuse is important for keeping your CT6 running well and reliably. This article will talk about the fuses and fuse box diagram for the 2018 Cadillac CT6. It will show you how to find and replace blown fuses so that your car’s electrical systems keep working.
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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-colored 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
2.0L, 3.0L and 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 | Power coolant pump |
| 3 | – |
| 4 | Traction power inverter 1 |
| 5 | Transmission/ Ignition |
| 6 | – |
| 7 | Starter motor |
| 8 | Starter pinion |
| 9 | Horn |
| 10 | – |
| 11 | – |
| 12 | – |
| 13 | High beam headlamps |
| 14 | Air conditioning control relay |
| 15 | Starter motor relay |
| 16 | Starter pinion relay |
| 17 | Run/Crank relay |
| 18 | Right cornering LED |
| 19 | – |
| 20 | High beam headlamp relay |
| 21 | Air conditioning clutch |
| 22 | – |
| 23 | Coolant heater control module |
| 24 | Cabin coolant pump |
| 25 | Cabin coolant pump relay |
| 26 | Hi fuel |
| 27 | Steering column lock |
| 28 | Rear heated seats |
| 29 | Front heated seats |
| 30 | – |
| 31 | HDLP/DRL/ Right headlamp |
| 32 | The air conditioning control module |
| 33 | – |
| 34 | – |
| 35 | Engine control module IGN2 |
| 36 | Engine control module IGN1 |
| 37 | Coolant pump/ Ignition coils–odd |
| 38 | Ignition coils–even/Non-walk 2 |
| 39 | Non-walk |
| 40 | Instrument cluster |
| 41 | – |
| 42 | Fuel pump power module |
| 43 | Instrument panel body/Ignition |
| 44 | Aeroshutter |
| 45 | Washer |
| 46 | Front sensor |
| 47 | Left cornering LED |
| 48 | – |
| 49 | – |
| 50 | Engine control module relay |
| 51 | Wiper speed relay |
| 52 | Wiper control relay |
| 53 | Headlamp control relay |
| 54 | – |
| 55 | – |
| 56 | – |
| 57 | – |
| 58 | – |
| 59 | – |
| 60 | Antilock brake system pump |
| 61 | Front wiper |
| 62 | Headlamp leveling |
| 63 | Electric brake booster module |
| 64 | – |
| 65 | – |
| 66 | Transfer case control module |
| 67 | Electric brake booster |
| 68 | Rear seat entertainment display |
| 69 | Rechargeable energy storage system coolant pump |
| 70 | – |
| 71 | Antilock brake system valve |
| 72 | – |
| 73 | – |
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.
To reinstall the compartment, reverse the steps. The vehicle may not be equipped with all of the fuses shown.
| Fuses | Usage |
| F1 | Power outlet |
| F2 | Visor |
| F3 | Front blower |
| F4 | Body Control Module 8 |
| F5 | Power steering column |
| F6 | 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 | – |
| F15 | Rear vision camera |
| F16 | Display |
| F17 | Heating, ventilation, and air conditioning control |
| F18 | OnStar |
| F19 | – |
| F20 | – |
| F21 | Traction power inverter 2 |
| F22 | Infotainment 2 |
| F23 | Central gateway module |
| F24 | Infotainment 1 |
| F25 | Video processing module |
| 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 of the rear compartment.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| F01 | UCAP |
| F02 | Trunk power outlet |
| F03 | Left window |
| F04 | – |
| F05 | Canister vent |
| F06 | Right rear memory seat |
| F07 | Body Control Module 7 |
| F08 | Seat adjustment switch |
| F09 | Passive entry/passive start |
| 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 | Regulated voltage control battery |
| F19 | Driver passenger door window/mirror/ driver seat adjustment |
| F20 | – |
| F21 | Vehicle integration control module |
| 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 mirror |
| F34 | Power trunk module |
| F35 | On the onboard charging module |
| F36 | Alarm siren module |
| F37 | AC DC inverter |
| F38 | Rear blower |
| F39 | Fuel pump power |
| F40 | – |
| F41 | Rear seat power outlet |
| F42 | Left rear memory seat |
| F43 | – |
| F44 | Rear closure release switch/lift gate module |
| F45 | Auxiliary audio/ video/radio |
| F46 | External object calculating module/ side blind zone alert/ rear center short-range radar sensor/ long-range radar sensors |
| F47 | – |
| F48 | Right front seat |
| F49 | Memory booster module |
| F50 | Body control module 1 |
| F51 | Transmission control module |
| F52 | Parking assist |
| F53 | Ventilated seats |
| F54 | Headliner |
| F55 | Front memory seat module |
| F56 | Evaporative emissions leak check module |
| F57 | Voltage current temperature module |
| F58 | – |
| F59 | Engine control module battery |
| F60 | Right front motorized seat belt pretensioner |
| F61 | Parking lamps |
| F62 | – |
| F63 | – |
| F64 | Engine control module ignition |
| F65 | Rear window sunshade |
| F66 | Rear vision camera/ interior rearview mirror |
| F67 | Run/crank misc/DC-DC converter/air quality sensor |
| F68 | Damping control module |
| F69 | Television tuner module |
| F70 | – |
| F71 | – |
| F72 | – |
| F73 | – |
| F74 | – |
| F75 | – |
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| 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 |
How to Replace of Fuse Cadillac CT6
Replacing a fuse in a Cadillac CT6 is a straightforward process. Here’s a step-by-step guide along with some tips:
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Locate the Fuse Box: The fuse box in the Cadillac CT6 is typically located in the engine bay, near the battery, or inside the vehicle under the dashboard.
-
Turn Off the Ignition: Before starting any work, make sure the ignition is turned off to prevent electrical accidents.
-
Remove the Blown Fuse: Using a fuse puller tool or a pair of needle-nose pliers, carefully grasp the blown fuse and pull it straight out of its socket. Be gentle to avoid damaging the fuse box or surrounding components.
-
Inspect the Fuse: Take a moment to visually inspect the blown fuse to confirm that it is indeed faulty.
-
Replace with a New Fuse: Select a new fuse of the same amperage rating as the blown one. Insert the new fuse into the empty socket, ensuring it is seated securely.
-
Test the Component: Once the new fuse is in place, turn on the ignition and test the component to verify that it is now functioning properly.
-
Replace the Fuse Box Cover: Once you have replaced the fuse and confirmed that the component is working, securely reattach the fuse box cover.
Tips:
- Always carry spare fuses of various amperages in your vehicle in case of emergencies.
- Replace a blown fuse with one of the same amperage rating to avoid damaging the electrical system.
- Work carefully to avoid causing any damage to the fuse box or surrounding components.
- If you frequently experience blown fuses, it may indicate an underlying electrical issue that requires professional diagnosis and repair.
FAQs
You can visually inspect the fuse to see if the metal strip inside is broken. Additionally, your vehicle may display warning lights or experience specific electrical failures indicating a blown fuse.
The fuse box in the 2018 Cadillac CT6 is typically located in the passenger compartment, often near the driver’s side footwell or under the dashboard.
Generally, you’ll only need a pair of needle-nose pliers or a fuse puller to remove the blown fuse from the fuse box.
It’s crucial to turn off the ignition and disconnect any power sources to prevent electrical shock or damage to the vehicle’s components.
Use a fuse puller or needle-nose pliers to grip the blown fuse firmly and gently pull it straight out of its socket.
Check the metal strip inside the fuse to see if it’s intact or broken. A broken strip indicates a blown fuse that needs replacement.
Align the new fuse with the corresponding socket in the fuse box and gently press it in until it’s securely seated.
Always handle fuses carefully and avoid touching the metal contacts to prevent contamination or damage.
If a new fuse blows immediately, it could indicate a more significant electrical issue that requires professional diagnosis and repair.
It’s not recommended to drive your vehicle with a blown fuse, as it may affect critical electrical systems necessary for safe operation.
Regularly inspecting fuses during routine maintenance checks and replacing any blown fuses promptly can help prevent electrical issues and ensure the continued reliability of your vehicle.
If you’re unable to resolve the issue yourself, it’s advisable to seek assistance from a qualified automotive technician who can diagnose and repair the underlying electrical problem.
Useful Link:
View full PDF: 2018 Cadillac CT6 Owner’s Manual | Auto User Guide
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