Replacing a Blown Fuses: 2018 Cadillac CTS Fuse Diagram
If your 2018 Cadillac CTS is having electrical problems, one of the first things you should do is check for and possibly replace any blown fuses. The fuse box usually sits in the engine bay or under the dashboard. It holds a group of fuses that keep different electrical parts from getting damaged by too much power or short circuits. During this process, a complete fuse diagram for the 2018 Cadillac CTS can be an extremely useful tool. This picture shows where each fuse is located and how much amperage it can handle. This makes it easier to find the fuse that is causing the system to not work. Now that owners have this information, they can quickly find and replace blown fuses, which will fix any electrical problems and keep their Cadillac CTS running smoothly.
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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
The underhood fuse block is on the passenger 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 | Passenger motorized seat belt |
| 4 | – |
| 5 | – |
| 6 | Driver power seat |
| 7 | – |
| 9 | – |
| 10 | – |
| 11 | – |
| 12 | – |
| 13 | Passenger power seat |
| 14 | – |
| 15 | Passive entry/Passive start |
| 16 | – |
| 17 | Headlamp washer |
| 18 | – |
| 19 | Antilock brake system pump |
| 20 | Antilock brake system valve |
| 21 | – |
| 22 | Driver motorized seat belt |
| 26 | – |
| 27 | –/Heated seat 2 |
| 28 | –/Reverse lockout |
| 29 | Adaptive forward lighting, Automatic headlamp leveling/ Pedestrian protection |
| 30 | – |
| 31 | Passenger window switch |
| 32 | – |
| 33 | Sunroof |
| 34 | Front wiper |
| 35 | Steering column lock |
| 36 | Rear bussed electrical center/Ignition |
| 37 | –/Malfunction Indicator Lamp/ Ignition |
| 38 | Aeroshutter |
| 39 | O2 sensor/Emissions |
| 40 | Ignition coil even/O2 sensor |
| 41 | Ignition coil odd |
| 42 | Engine control module |
| 43 | – |
| 44 | – |
| 45 | Washer |
| 48 | Instrument panel/ Body/Ignition |
| 49 | Fuel system control module/Ignition |
| 50 | Heated steering wheel |
| 51 | Engine control module/Ignition |
| 52 | Transmission control module/Ignition |
| 53 | Coolant pump |
| 55 | – |
| 56 | Transmission control module |
| 64 | Adaptive headlamp leveling |
| 65 | Left HID headlamp |
| 66 | Right HID headlamp |
| 67 | Left/Right high beam headlamp |
| 68 | Headlamp leveling motor |
| 69 | Horn |
| 71 | Cooling fan |
| 72 | Starter 2 |
| 73 | Brake vacuum pump |
| 74 | Starter 1 |
| 75 | Air conditioning clutch |
| 76 | – |
| Relays | Usage |
| 8 | Headlamp washer |
| 23 | Wiper control VEHICLE CARE 289 |
| 24 | Wiper speed |
| 25 | Engine control module |
| 46 | Rear washer |
| 47 | Front washer |
| 54 | Coolant pump |
| 57 | Low beam headlamp relay |
| 58 | High beam headlamp |
| 59 | Run/Crank |
| 60 | Starter 2 |
| 61 | Vacuum pump |
| 62 | Starter 1 |
| 63 | Air conditioning control |
| 70 | Horn |
Instrument Panel Fuse Block
The instrument panel fuse block is at the end of the driver’s 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 |
| 2 | Cupholder motor |
| 3 | Electric steering column lock |
| 4 | – |
| 5 | – |
| 6 | Tilt and telescopic steering column |
| 8 | Data link connector |
| 9 | Glovebox release |
| 10 | Shunt |
| 11 | Body Control Module 1 |
| 12 | Body Control Module 5 |
| 13 | Body Control Module 6 |
| 14 | – |
| 15 | Body Control Module 7 |
| 16 | Transmission control module |
| 17 | – |
| 18 | – |
| 19 | Auxiliary power outlet |
| 20 | Lighter |
| 21 | Wireless charger |
| 22 | Sensing diagnostic module/Automatic occupant sensing |
| 23 | Radio/DVD/Heating, ventilation/Air conditioning control |
| 24 | Display |
| 25 | Heated steering wheel |
| 26 | Wireless charger |
| 27 | Steering wheel controls |
| 28 | – |
| 29 | Visor vanity lamp |
| 30 | – |
| 31 | Retained accessory power/Accessory |
| 32 | – |
| 33 | Front heating, ventilation/Air conditioning control blower |
| Circuit Breakers | Usage |
| CB1 | Auxiliary power outlet |
| CB7 | – |
| Relays | Usage |
| K10 | Retained accessory power/Accessory |
| K605 | Logistics |
| K644 | Retained accessory power/Accessory / Glovebox release |
Rear Compartment Fuse Block
The rear compartment fuse block is behind a cover on the driver’s side of the rear compartment.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
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| Fuses | Usage |
| 1 | Rear driver control module/DC DC transformer |
| 2 | Left window |
| 3 | Body Control Module 8 |
| 4 | Alternate current inverter |
| 5 | Passive entry/Passive start/ Battery 1 |
| 6 | Body control module 4 |
| 7 | Heated mirrors |
| 8 | Amplifier |
| 9 | Rear window defogger |
| 10 | Glass break |
| 11 | Trailer connector |
| 12 | OnStar (if equipped) |
| 13 | Right window |
| 14 | Electric parking brake |
| 15 | – |
| 16 | Trunk release |
| 19 | Logistics |
| 21 | Mirror window module |
| 22 | – |
| 23 | Canister vent |
| 24 | Body control module 2 |
| 25 | Rear vision camera |
| 26 | Front ventilated seats |
| 27 | Side blind zone alert/Lane departure warning/External object calculating module |
| 28 | Trailer/Sunshade |
| 29 | Rear heated seats |
| 30 | Semi-active damping system |
| 31 | Transfer case control module/Rear control drive module |
| 32 | Theft module/Universal garage door opener/Rain sensor |
| 33 | Ultrasonic parking assist |
| 34 | Radio/DVD |
| 35 | – /Exhaust valve (V series) |
| 36 | Trailer |
| 37 | Fuel system control module |
| 38 | Fuel pump prime/Exhaust valve (V series) |
| 39 | – |
| 42 | Memory seat module |
| 43 | Body control module 3 |
| 44 | – |
| 45 | Battery-regulated voltage control |
| 46 | Engine control module/ Battery |
| 47 | – |
| 48 | – |
| 49 | Trailer module |
| 53 | – |
| 55 | – |
| Relays | Usage |
| 17 | Trailer |
| 18 | Logistics |
| 20 | Rear window defogger |
| 40 | Run crank 2 (V series) |
| 41 | Fuel pump prime/ Run crank 2 |
| 50 | Child door lock security |
| 51 | Rear closure |
| 52 | Rear closure 2 |
| 54 | Door lock security |
| 56 | Fuel door |
FAQs
The fuse box in a 2018 Cadillac CTS is typically located in the interior of the vehicle, usually on the driver’s side. It may be behind a panel or under the dashboard.
A blown fuse will have a visibly broken filament, or the metal strip inside will be melted. You can also use a multimeter to check for continuity.
Usually, you’ll only need a pair of needle-nose pliers or a fuse puller to remove the blown fuse.
Yes, there should be a fuse diagram in the owner’s manual of the vehicle. You can also find it online or on the fuse box cover.
Yes, it’s important to replace a blown fuse with one of the same amperage rating to prevent electrical issues or damage to the vehicle.
It’s not recommended to use a fuse with a different rating. If you don’t have the correct fuse, it’s best to obtain one before replacing it.
Typically, you’ll need to open the driver’s side door and look for a panel on the side of the dashboard or under the steering column. Remove the panel to access the fuse box.
Yes, it’s important to turn off the ignition and any electrical components before replacing a fuse to avoid electrical shock or damage.
If the fuse continues to blow after replacement, there may be an underlying electrical issue that needs to be diagnosed by a professional.
Replacing a fuse is a relatively simple task that can be done by most car owners. However, if you’re unsure or uncomfortable doing it yourself, it’s always best to consult a professional mechanic.
Fuses generally don’t need to be replaced regularly unless there’s an electrical issue or a fuse blows due to a power surge or short circuit.
Blown fuses can occur due to a variety of reasons, including short circuits, faulty electrical components, or overloading the circuit.
It’s not recommended to use a fuse with a higher rating, as it can lead to damage to the vehicle’s electrical system or even cause a fire.
Some warning signs of a failing fuse include intermittent electrical issues, such as malfunctioning lights or accessories, or a burning smell coming from the fuse box.
To prevent blown fuses, avoid overloading electrical circuits, regularly inspect electrical components for signs of wear or damage, and address any electrical issues promptly.
Useful Link:
View full PDF: 2018 Cadillac CTS Owner’s Manual | Auto User Guide
2023 Cadillac Escalade Review, Specs, Price, And Mileage (Brochure)