2026 Cadillac CT5 Fuses and Fuse Box User Guide
Understand about the 2026 Cadillac CT5 fuse box layout, fuse placements, and amperage. This guide shows how to securely identify, examine, and replace fuses to preserve electrical performance and avoid CT5 electrical difficulties.
Video: 2026 Cadillac CT5 Fuses
Cadillac Electrical System Guide
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.
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.
To check a fuse, look at the band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a fuse of the identical size and rating.
Replacing a Blown Fuse
- Turn off the ignition.
- Locate the fuse puller in the engine compartment fuse block.
- Use the fuse puller to remove the fuse from the top or side, as shown above.
- If the fuse must be replaced immediately, borrow a replacement fuse with the same amperage from the fuse block. Choose
a vehicle feature that is not needed to safely operate the vehicle. Repeat Steps 2-3. - Insert the replacement fuse into the empty slot of the blown fuse.
At the next opportunity, see your dealer to replace the blown fuse.
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. 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 of time. 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
Danger
Fuses and circuit breakers are marked with their ampere rating. Do not exceed the specified amperage rating when replacing fuses and circuit breakers. 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.
The fuses and circuit breakers protect the electrical system from short circuits, greatly reducing the chance of electrical damage or fire.
Engine Compartment Fuse Block
The engine compartment fuse block is on the driver 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 on the vehicle may damage it. Always keep the covers on any electrical component.
| Fuses | Usage |
| F01 | Long Range Radar Front Sensor |
| F02 | – |
| F03 | Exterior Lighting Module 4 |
| F04 | Exterior Lighting Module 7 |
| F05 | Spare |
| F06 | – |
| F07 | Electronic Brake Control Module |
| F08 | Washer Pump |
| F09 | – |
| F10 | – |
| F11 | – |
| F12 | Horn |
| F13 | Front Wiper |
| F14 | Spare |
| F15 | Spare |
| F16 | Exterior Lighting Module 5 |
| F17 | Exterior Lighting Module 3 |
| F18 | Aero Shutter |
| F19 | – |
| F20 | – |
| F21 | Automatic Light Module/Power Sounder Module |
| F22 | Engine Control Module Battery |
| F23 | Transmission Control Module |
| F24 | Active Engine Mount |
| F25 | – |
| F26 | Engine Control Module |
| F27 | Injectors/Ignition 2 |
| F28 | Charged Air Cooler/Not Used |
| F29 | Transmission Aux Oil Pump/Transmission Reverse Lock Out |
| F30 | Injectors/Ignition 1 |
| F31 | Emissions 1 |
| F32 | Emissions 2 |
| F33 | Starter Solenoid |
| F34 | – |
| F35 | – |
| F36 | Starter Pinion/Not Used |
| F37 | − |
| F38 | – |
| F39 | – |
| F40 | – |
| F41 | – |
| F42 | Water Pump/Not Used |
| F43 | – |
| F44 | – |
| Relays | Usage |
| K47 | – |
| K48 | Front Wiper Speed/Not Used |
| K49 | Front Wiper Control |
| K51 | – |
| K52 | Engine Control Module |
| K53 | Starter Solenoid |
| K54 | Starter Pinion/Not Used |
| K55 | – |
| K57 | AC Clutch |
| K58 | – |
Instrument Panel Fuse Block
The instrument panel fuse block is in 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 | Heating, Ventilation, and Air Conditioning Blower |
| 3 | – |
| 4 | – |
| 5 | Theft Deterrent/Universal Garage Door Opener/ Overhead Console/Rain Sensor |
| 6 | – |
| 7 | – |
| 8 | Heated Steering Wheel |
| 9 | – |
| 10 | Electronic Steering Column Lock 1 |
| 11 | – |
| 12 | – |
| 13 | – |
| 14 | – |
| 15 | – |
| 16 | – |
| 17 | – |
| 18 | Display/Infotainment/ USB/Multi-function Control Module |
| 19 | Sensing and Diagnostic Module/Automatic Occupant Sensing/Data Link Connection/Wireless Charging Module/Virtual Key Module |
| 20 | Power Steering Column Module/Electronic Steering Column Lock 2 |
| 21 | Driver Monitor System/ Performance Data Recorder |
| 22 | – |
| 23 | – |
| 24 | – |
| 25 | USB |
| 26 | – |
| 27 | – |
| 28 | – |
| 29 | – |
| 30 | – |
| 31 | Headlamp Level/Spare |
| 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 side of the rear compartment.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| 1 | Remote Function Actuator |
| 2 | – |
| 3 | Driver Heated Seat |
| 4 | Fuel Tank Zone Module |
| 5 | – |
| 6 | – |
| 7 | – |
| 8 | – |
| 9 | – |
| 10 | – |
| 11 | Canister Vent Solenoid |
| 12 | Sunroof |
| 13 | – |
| 14 | – |
| 15 | Passenger Heated Seat |
| 16 | Exterior Lighting Module 1 |
| 17 | Electronic Suspension Control |
| 18 | – |
| 19 | – |
| 20 | Rear Defog |
| 21 | DC to DC Transformer 2 |
| 22 | Driver Power Window/ Door Handle Switch |
| 23 | External Object Calculating Module/Front Camera Module/High Definition Localization Module/Short Range Radar |
| 24 | Passenger Power Window/Door Handle Switch |
| 25 | – |
| 26 | Amplifier (V Series Blackwing) |
| 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 | Amplifier |
| 39 | Right Front/Right Rear Window |
| 40 | – |
| 41 | – |
| 42 | Amplifier |
| 43 | Park Assist Module |
| 44 | Driver Memory Seat Module |
| 45 | OnStar |
| 46 | – |
| 47 | Exterior Lighting Module 7 |
| 48 | – |
| 49 | – |
| 50 | Driver Seat |
| 51 | Left Front/Left Rear Window |
| 52 | Passenger Seat |
| Relays | Usage |
| 53 | – |
| 54 | – |
| 55 | Run |
How to replace the Fuse of the 2026 Cadillac CT5
Here’s a clear walkthrough on how to locate and replace a fuse in your 2026 Cadillac CT5:
Materials:
- The new fuse of the correct amperage.
- Fuse puller or needle-nose pliers.
Step-by-Step Fuse Replacement Guide
- Identify which fuse needs replacing
-
Determine the malfunctioning circuit (e.g., radio, headlights, AC blower).
-
Consult the fuse box diagram – a sturdy source is FuseBoxInfo, which outlines fuse numbering and function across:
-
Instrument‑panel fuse box (driver side end within the cabin)
-
Engine‑compartment fuse box (under the hood)
-
Luggage‑compartment fuse box (behind cover in rear trunk, driver side)
-
- Match the faulty component with the correct fuse number.
-
- Access the correct fuse box
-
Instrument‐panel: Pop open the panel on the driver’s left side.
-
Engine bay: Lift hood and open the main under‑hood fuse box.
-
Trunk: Remove the side‑wall cover on the driver side of the cargo area.
-
- Inspect and replace the fuse
-
Before touching anything, turn the ignition off and remove the key.
-
Use the fuse puller (usually clipped inside the fuse‑box cover) or needle‑nose pliers.
-
Remove the suspect fuse and hold it up to the light—if the internal wire is broken or burnt, it’s blown.
-
Replace it with an identical fuse (same amp rating and type). FuseBoxInfo’s diagrams indicate each fuse’s amp rating (e.g., 10 A, 20 A).
-
- Test and secure
-
Gently seat the new fuse into the same slot.
-
Replace the fuse box cover and any panels removed.
-
Turn on the ignition and test the component to ensure proper operation.
-
Tips for a smooth process
-
Always replace a blown fuse with one that has the exact amperage.
-
Keep a few spare fuses (commonly 10 A, 15 A, 20 A) in your glove box for quick fixes.
Useful Links:
2024 Cadillac CT5 Specs, Price, Features, Mileage and Review
2026 Cadillac CT5 Seats and Seat Belts User Guide
2026 Cadillac CT5 Automatic Transmission User Guide