CAR SPEC SHEET

Cadillac CT4 Fuse Box: What Each Fuse Does

From the 2026 Cadillac CT4 owner's manual. 3 fuse boxes listed.

FuseCircuit
F01Long Range Radar Front Sensor
F02–
F03Exterior Lighting Module 4
F04Exterior Lighting Module 7
F05Headlight Level
F06–
F07Electronic Brake Control Module
F08Washer Pump
F09–
F10–
F11–
F12Horn
F13Front Wiper
F14Exterior Lighting Module 6
F15Exterior Lighting Module 1
F16Exterior Lighting Module 5
F17Exterior Lighting Module 3
F18Aero Shutter
F19–
F20–
F21Automatic Light Module/ Power Sounder Module
F22Engine Control Module Battery
F23Transmission Control Module
F24Active Engine Mount
F25–
F26Engine Control Module
F27Injectors/Ignition 2
F28Charged Air Cooler/Not Used
F29Transmission Aux Oil Pump/Transmission Reverse Lock Out
F30Injectors/Ignition 1
F31Emissions 1
F32Emissions 2
F33Starter Solenoid
F34–
F35–
F36Starter Pinion/Not Used
F37–
F38–
F39–
F40–
F41–
F42Water Pump/Not Used
F43–
F44–
K47–
K48Front Wiper Speed/Not Used
K49Front Wiper Control
K51–
K52Engine Control Module
K53Starter Solenoid
K54Starter Pinion/Not Used
K55–
K57AC Clutch
K58–

Source: owner's manual, PDF pages 318, 319.

Instrument Panel Fuse Block

Location: In the end of the driver side of the instrument panel

FuseCircuit
F01–
F02Heating, Ventilation, and Air Conditioning Blower
F03–
F04–
F05Rain/Theft Deterrent/ Over Head Console/ Universal Garage Door Opener
F06–
F07–
F08Heated Steering Wheel
F09–
F10Electronic Steering Column Lock 1
F11–
F12–
F13–
F14–
F15–
F16–
F17–
F18Display/Infotainment
F19Airbag/Automatic Occupant Sensing/Data Link Connection/Wireless Charging Module
F20Power Steering Column Module/Electronic Steering Column Lock 2
F21Driver Monitor System/Performance Data Recorder
F22–
F23–
F24–
F25USB
F26–
F27–
F28–
F29–
F30–
F31Headlight Level/Spare
F32–
F33Body Ignition/IP Ignition
F34Exhaust Valve
F35Transmission Control Module Ignition/Engine Control Module Ignition/Shift Ignition/ Brake Ignition
F36Shifter Interface Board
F37Body Control Module 1/Electronic Park Brake Switch
F38Center Stack Module
F39Steering Wheel Controls
F40Body Control Module 2
F41Body Control Module 3
F42Body Control Module 4
CB01Auxiliary Power Outlet 1
CB02Auxiliary Power Outlet 2
K01Run After Park/Accessory
K02Run Crank
K03–
K04–
K05–

Source: owner's manual, PDF pages 319, 321, 322.

Rear Compartment Fuse Block

Location: Behind a cover on the driver side of the rear compartment

FuseCircuit
F01Remote Function Actuator
F02–
F03Driver Heated Seat
F04Fuel Tank Zone Module
F05–
F06–
F07–
F08–
F09–
F10Motor Seat Belt Passenger
F11Canister Vent Solenoid
F12Sunroof
F13–
F14–
F15Passenger Heated Seat
F16–
F17Electronic Suspension Control
F18–
F19Motor Seat Belt Driver
F20Rear Defog
F21DC to DC Transformer 2
F22Driver Power Window/ Door Handle Switch
F23External Object Calculating Module/ Front Camera Module/ High Definition Localization Module/ Short Range Radar
F24Passenger Power Window/Door Handle Switch
F25–
F26Amplifier (V- Series Blackwing)
F27Rear Drive Control Module
F28–
F29–
F30–
F31DC to DC Transformer 1
F32Transfer Case Electronic Control
F33Central Gateway Module/ Side Blind Zone Alert
F34Video Processing Module
F35Hands Free Closure Release
F36Exterior Lighting Module 2
F37Passenger Memory Seat Module
F38–
F39Right Front/Right Rear Window
F40–
F41–
F42Amplifier
F43Park Assist Module
F44Driver Memory Seat Module
F45OnStar
F46–
F47–
F48–
F49–
F50Driver Seat
F51Left Front/Left Rear Window
F52Passenger Seat
K53–
K54–
K55Run

Source: owner's manual, PDF pages 322, 323, 324.

Listings are copied as text from the manual's fuse tables (AI-assisted; every circuit name was matched against the cited pages 2026-10-18). Fuse layouts can differ by trim and year; check the label on the fuse box cover before replacing a fuse, and always use the same amp rating.

Confirm with your own manual, dipstick or door-jamb label.
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