Cadillac XT4 (2019 – 2025) Fuse Box Location & Diagrams
Find the fuse box locations and complete fuse diagrams for the Cadillac XT4 (2019–2025). This guide helps you quickly identify fuse assignments and relays for troubleshooting electrical issues and replacing blown fuses safely.
Fuse Box Location
Passenger Compartment Fuse Box
The fuse box is located on the driver’s side of the instrument panel behind the cover.
Engine Compartment Fuse Box
Fuse Box Diagrams
Passenger Compartment Fuse Box
Cadillac XT4 (2019-2021)
| № | Usage |
|---|---|
| F1 | Left power window |
| F2 | Right power window |
| F3 | Not Used |
| F4 | DC DC battery 2/1 |
| F5 | Auxiliary power outlet – cargo |
| F6 | Heated seat battery 1 |
| F7 | Heated seat battery 2 |
| F8 | Body control module 3 |
| F9 | Electric parking brake switch |
| F10 | Body control module 2 (stop/start) |
| F11 | Not Used |
| F12 | Not Used |
| F13 | Not Used |
| F14 | Not Used |
| F15 | Transmission control module (stop/start) |
| F16 | Amplifier |
| F17 | Not Used |
| F18 | Video processing module |
| F19 | Power steering column |
| F20 | Body control module 6 |
| F21 | Body control module 4 |
| F22 | Body control module 7 |
| F23 | Electric steering column lock |
| F24 | Airbag |
| F25 | Data link connector |
| F26 | Not Used |
| F27 | Not Used |
| F28 | Not Used |
| F29 | Body control module 8 |
| F30 | Overhead console |
| F31 | Steering wheel control |
| F32 | Not Used |
| F33 | Heating ventilation/Air conditioning |
| F34 | Central gateway module (CGM) |
| F35 | Heated switch |
| F36 | Charger |
| F37 | Auxiliary power outlet – front |
| F38 | OnStar |
| F39 | Display |
| F40 | Obstacle detection |
| F41 | Body control module 1 (stop/start) |
| F42 | Radio |
| F43 | Auxiliary power outlet – console (circuit breaker) |
| F44 | Auxiliary power outlet – console |
| Relays | |
| K1 | Not Used |
| K2 | Retained accessory power |
| K3 | 2021: Content theft |
| K4 | Not Used |
| K5 | Not Used |
Cadillac XT4 (2022 & 2023)
| № | Usage |
|---|---|
| F1 | Left Power Window |
| F2 | Right Power Window |
| F3 | — |
| F4 | Direct Current to Direct Current Converter 2 |
| F5 | Auxiliary Power Outlet – Cargo |
| F6 | Heated Seat Battery 1 |
| F7 | Heated Seat Battery 2 |
| F8 | Body Control Module 3 – LED Headlamp Low Beam Right Control Signal, Right Front Turn Lamp Control Signal, Left Front Side Marker and Auxiliary Park, Left Rear Tail/Side Marker Control Signal, Left Daytime Running Lamps Control Signal |
| F9 | Electric Park Brake |
| F10 | Body Control Module 2 (Stop/Start) – Interior Lamps Control Signal, Door Handle Puddle Lamp (LED), Left Cornering Lamp, Right Cornering Lamp, Interior Lamps Control Signal, Backup Lamp Supply Voltage, License Plate Lamp Control Signal, Rear Closure Cargo Lamp Control Signal, Center High Mounted Stop Lamp LED Lamp Control Signal |
| F11 | — |
| F12 | — |
| F13 | — |
| F14 | — |
| F15 | Transmission Control Module (Stop/ Start) |
| F16 | Amplifier |
| F17 | |
| F18 | Video Processing Module |
| F19 | Power Steering Column |
| F20 | Body Control Module 6 – LED Backlight Control, Interior Lighting Inadvertent Load Control Signal, Fuel Door Lock Control Signal, LED Backlight Control Signal |
| F21 | Body Control Module 4 – LED Headlamp Low Beam Left Control Signal, Right Front Side Marker and Auxiliary Park, Right Rear Tail/ Side Marker Control Signal, Left Rear Stop Lamp Control Signal, Left Rear Stop/Turn Lamp Control Signal, Right DRL Control Signal |
| F22 | Body Control Module 7 – Right Rear Stop Lamp Control Signal, Right Rear Stop/ Turn Lamp Control Signal, Left Front Turn Lamp Control Signal, Right Rear Turn Control Signal |
| F23 | — |
| F24 | Airbag |
| F25 | Data Link Connector |
| F26 | — |
| F27 | — |
| F28 | — |
| F29 | Body Control Module 8 – Internal Driver/Fuel Door Unlock Relay Control Signal, Internal Non-Driver Door Lock Relay Control Signal, Internal All Door Unlock Relay Control Signal |
| F30 | Overhead Console |
| F31 | Steering Wheel Controls |
| F32 | — |
| F33 | Heating Ventilation and Air Conditioning Control Module |
| F34 | Central Gateway Module |
| F35 | Heated Seat Switch/Hazard Switch |
| F36 | Wireless Charger Module/USB Charge Port |
| F37 | — |
| F38 | OnStar |
| F39 | Shifter Interface Board/Center Stack/Head Up Display/ Instrument Panel Cluster/HVAC Display |
| F40 | Long Range Radar Sensor/ Ultrasonic Park Assist Module/Camera Module/External Object Calculating Module/ Side Blind Zone Alert Modules/Front Camera Module |
| F41 | Body Control Module 1 (Stop/Start) – LED Indicator Lighting Control, Accessory LED Control, Run-Start LED Control, Ambient Lighting LED Control 2, Liftgate Latch Motor Control Signal, Rear Wiper Control Signal, High Beam Lamp Control (Direct Drive), Rear Fog LED Lamp Control Signal, Windshield Washer Pump Motor Control Signal, Run/Crank Relay Control Signal, ECM/TCM ACC Wakeup Control Signal, Left Rear Turn Control Signal, Rear Wiper Wash Pump Control Signal, Brake Pedal Apply Signal |
| F42 | Radio |
| F43 | Console Auxiliary Power Outlet (Circuit Breaker) |
| F44 | Front Console Auxiliary Power Outlet |
| Relay | |
| K1 | — |
| K2 | Retained Accessory Power |
| K3 | — |
| K4 | — |
| K5 | — |
Cadillac XT4 (2024 & 2025)
| № | Usage |
|---|---|
| F1 | Blower Motor |
| F2 | ELM 1 – Exterior Lighting Module 1 |
| F3 | Column Lock |
| F4 | ELM 2 – Exterior Lighting Module 2 |
| F5 | BCM 2 – Body Control Module 2 |
| F6 | Amplifier |
| F7 | Clock Spring |
| F8 | DLC – Data Link Connector |
| F9 | BCM 1 – Body Control Module 1 SIB – Shifter Interface Board |
| F10 | Headliner/Auxiliary Switch |
| F11 | Display and HVAC |
| F12 | Steering Column Lock |
| F13 | Video Driving Monitoring System (DMS) / Safety 2 |
| F14 | RC MISC 3/ECM – Ride Control Miscellaneous 3/ Electronic Control Module |
| F15 | Rear Wiper |
| F16 | Cargo APO – Cargo Auxiliary Power Outlet |
| F17 | Sensing Diagnostic Module (SDM) / Safety 1 |
| F18 | RC MISC1/MISC2 -Ride Control Miscellaneous!/ Miscellaneous 2 |
| F19 | Exterior Lighting Module (ELM) TR6 |
| F20 | Central Gateway Module(CGM) / Telematics (OnStar) |
| F21 | – |
| F22 | European Trailer |
| F23 | Auxiliary Power Outlet (APO) Cigar |
| F24 | Wireless Charger |
| F25 | USB |
| F26 | ELM 6 – Exterior Lighting Module 6 |
| F27 | VCU AUX JACK – Vehicle Communication Unit Auxiliary Jack |
| F28 | ELM 7 – Exterior Lighting Module 7 |
| F29 | – |
| F30 | – |
| F31 | BCM 3 – Body Control Module 3 |
| F32 | HSWM – Heated Steering Wheel Module |
| F33 | – |
| F34 | STEERING CLMN ADJ MDL – Steering Column Adjacent Module |
| F35 | Amplifier |
| F36 | DC/DC BAH 2 |
| F37 | – |
| F38 | – |
| F39 | BCM 4 – Body Control Module 4 |
| F40 | – |
| Relay | |
| CB01 | Auxiliary Power Outlet (APO) Row 2 |
| CB02 | Auxiliary Power Outlet (APO) Row 1 |
Engine Compartment Fuse Box
Cadillac XT4 (2019-2021)
| № | Usage |
|---|---|
| 3 | 2019-2020: Antilock brake system pump 2021: Electronic brake control module |
| 5 | 2019: Not Used 2020-2021: Trailer brake |
| 6 | Rear closure |
| 7 | Trailer stop/Turn LH |
| 8 | Memory seat module |
| 9 | Pedestrian friendly alert function |
| 10 | Semi-active damping system |
| 11 | 2019: DC-DC Battery 1 2020-2021: DC-DC Battery 1/2 |
| 12 | Rear defogger |
| 13 | Heated mirror |
| 14 | Not Used |
| 15 | Passive entry passive start |
| 16 | Front wiper |
| 17 | Passenger power seat |
| 18 | Power liftgate module |
| 19 | Driver power seat |
| 21 | Sunroof |
| 22 | Rear wiper |
| 23 | 2019: Auto headlamp leveling/Canister vent solenoid 2020-2021: Trailer interface module 2 |
| 26 | Transmission control module/Ignition |
| 27 | Instrument panel body/Ignition |
| 28 | Rear wiper |
| 29 | 2019: Seat ventilation 2020-2021: Trailer ignition |
| 30 | 2019-2020: Malfunction indicator lamp 2021: Malfunction indicator lamp start/stop Trailer interface module ignition |
| 32 | Rear drive control module 1 |
| 33 | 2019-2020: Front heated seat |
| 34 | Handsfree/Window switch |
| 35 | 2019: Not Used 2020-2021: Diesel exhaust fuel heater |
| 36 | Fuel module |
| 39 | Massage |
| 40 | Steering column lock |
| 41 | Not Used |
| 43 | Heated steering wheel |
| 44 | 2019: Not Used 2020: Seat ventilation 2021: Seat ventilation / Front heated seat |
| 46 | Engine control module/Ignition |
| 48 | Rear drive control module 2 |
| 49 | Heating ventilation/ Air conditioning blower motor |
| 50 | Not Used |
| 51 | Not Used |
| 54 | Not Used |
| 55 | Not Used |
| 56 | Starter motor |
| 57 | Not Used |
| 58 | Not Used |
| 59 | High-beam headlamps |
| 60 | 2019: Not Used 2020-2021: Trailer interface module 1 |
| 61 | Not Used |
| 62 | Not Used |
| 63 | Not Used |
| 65 | Air conditioning control |
| 67 | Not Used |
| 68 | Not Used |
| 69 | Not Used |
| 70 | Trailer park lamp |
| 72 | Starter pinion |
| 75 | Engine control module |
| 76 | Powertrain off engine |
| 78 | Horn |
| 79 | Washer pump |
| 81 | Transmission control module/Engine control module |
| 82 | 2019: Not Used 2020-2021: Nitrogen oxide sensor |
| 83 | Ignition coil |
| 84 | Powertrain on engine |
| 85 | Shunt |
| 86 | Shunt |
| 87 | 2019: Not Used 2020-2021: Diesel fuel heater 1 |
| 88 | Aeroshutter |
| 89 | 2019: Not Used 2020-2021: Selective catalytic reduction module |
| 92 | Trailer stop/Turn right |
| 93 | 2019: Not Used 2020-2021: Automatic headlamp leveling/Canister vent solenoid |
| 95 | 2019: Not Used 2020-2021: Smart sensors |
| 96 | 2019: Not Used 2020-2021: Diesel fuel heater 2 |
| 99 | Not Used |
| Relays | |
| 4 | Not Used |
| 20 | Rear defogger |
| 25 | Front wiper control |
| 31 | Run/Crank |
| 37 | Front wiper speed |
| 42 | Not Used |
| 64 | Starter motor |
| 66 | Powertrain |
| 71 | Trailer park lamp |
| 73 | Air conditioning control |
| 80 | Starter pinion |
| 90 | 2019: Not Used 2020-2021: Powertrain sensor |
| 94 | 2019: Not Used 2020-2021: Diesel exhaust fuel heater |
| 98 | 2019: Not Used 2020-2021: Diesel fuel heater |
Cadillac XT4 (2022 & 2023)
| Fuse/Relay No. | Usage |
|---|---|
| 3 | EBCM – Electronic Brake Control Module |
| 5 | 2022: Trailer Brake – Not Used / 2023: – |
| 6 | 2022: REAR CLOSR – Spare / 2023: – |
| 7 | Left Trailer Stop/Turn Lamp |
| 8 | Memory Seat Module (Driver & Passenger) |
| 9 | 2022: PFAF – Not Used / 2023: – |
| 10 | Semi-active Damping System / Spare |
| 11 | 2022: DC DC BAT 1/2 – DC-DC Converter 1 / 2023: DC DC BAT 2 – DC-DC Converter 2 |
| 12 | Rear Window Defogger |
| 13 | Heated Outside Rear View Mirrors |
| 14 | – |
| 15 | Passive Entry Passive Start (PEPS) |
| 16 | Front Wiper(s) |
| 17 | Passenger Power Seat |
| 18 | 2022: Power Liftgate / 2023: Liftgate Motor / Spare |
| 19 | Driver Power Seat / Memory Seat Module / Driver Seat Massage |
| 20 (Relay) | Rear Defogger / Outside Mirror Defogger |
| 21 | Power Sunroof |
| 22 | – |
| 23 | 2022: TIM 2 – Not Used / 2023: – |
| 25 (Relay) | Front Wiper Control |
| 26 | Transmission Control Module Ignition |
| 27 | 2022: IP Body Ignition / 2023: Miscellaneous 1 |
| 28 | Rear Wiper |
| 29 | 2022: Trailer Ignition – Not Used / 2023: – |
| 30 | 2022: MIL SS/TIM Ignition / 2023: Miscellaneous 2 |
| 31 (Relay) | Run / Crank |
| 32 | 2022: Rear Drive Control Module 1 / 2023: RDCM 2 / Spare |
| 33 | Front Heated Seat Power 2 / Spare |
| 34 | 2022: Handsfree/Liftgate/Window Switch / 2023: HFCR Module/Liftgate/Window Switch |
| 35 | 2022: DEFC 2 / Not Used / 2023: – |
| 36 | 2022: Fuel Module / 2023: Fuel Tank Zone Module |
| 37 (Relay) | Front Wiper Speed |
| 39 | Driver & Passenger Seat Massage |
| 40 | 2022: Spare / 2023: – |
| 41 | – |
| 42 (Relay) | – |
| 43 | Heated Steering Wheel |
| 44 | Front Heated/Vented Seats & Rear Heated Seats |
| 46 | Engine Control Module Ignition |
| 48 | 2022: Rear Drive Control Module 2 / 2023: RDCM 1 / Spare |
| 49 | HVAC Blower Motor |
| 50 | Spare |
| 51 | Spare |
| 54 | Spare |
| 55 | Spare |
| 56 | Starter Motor |
| 57 | – |
| 58 | – |
| 59 | High Beam Headlamps |
| 60 | 2022: TIM 1 – Not Used / 2023: – |
| 61 | Spare |
| 62 | Spare |
| 63 | Spare |
| 64 (Relay) | Starter Motor |
| 65 | 2022: A/C Clutch / 2023: A/C Compressor Clutch |
| 66 (Relay) | Powertrain |
| 67 | Spare |
| 68 | Spare |
| 69 | – |
| 70 | Trailer Park Lamp(s) |
| 71 (Relay) | Trailer Park Lamps |
| 72 | Starter Pinion |
| 73 (Relay) | A/C Control |
| 74 | – |
| 75 | 2022: ECM Main / 2023: ECM Powertrain Ignition 2 |
| 76 | 2022: Powertrain Off Engine (ECM Ignition 1) / 2023: ECM Powertrain Ignition 1 |
| 78 | Horn |
| 79 | Washer Pump(s) |
| 80 (Relay) | Starter Pinion |
| 81 | 2022: TCM/ECM/Cool Pump / 2023: ECM Battery / Spare |
| 82 | 2022: NOx Sensor – Not Used / 2023: – |
| 83 | Ignition Coils |
| 84 | Engine Sensors/Solenoids (2023 adds Humidity Sensor) |
| 85 | Shunt |
| 86 | 2022: Shunt / 2023: – |
| 87 | 2022: Diesel Fuel Heater 1 – Not Used / 2023: – |
| 88 | 2022: Aeroshutter / 2023: Aeroshutter / Spare |
| 89 | 2022: SCR Module – Not Used / 2023: – |
| 90 (Relay) | 2022: Powertrain Sensor – Not Used / 2023: – |
| 92 | 2022: Right Trailer Stop/Turn Lamp / 2023: Right Trailer Stop/Turn Lamp / Spare |
| 93 | Canister Vent Solenoid |
| 94 (Relay) | 2022: DEFC – Not Used / 2023: – |
| 95 | 2022: Smart Sensors – Not Used / 2023: – |
| 96 | 2022: Diesel Fuel Heater 2 – Not Used / 2023: – |
| 98 (Relay) | 2022: Diesel Fuel Heater – Not Used / 2023: – |
| 99 | – |
Cadillac XT4 (2024 & 2025)
| № | Usage |
|---|---|
| 1 | Spare |
| 2 | Aeroshutter |
| B | Spare |
| 4 | Spare |
| 5 | Spare |
| 6 | – |
| 7 | ECM 2 – Engine Control Module 2 ECM 3 – Engine Control Module 3 |
| 8 | ECM MAIN – Engine Control Module Main |
| 9 | – |
| 10 | OFF ENG |
| 11 | OFF ENG 2 / OFF ENG 1 |
| 12 | CAC – Charge Air Cooler ECM – Engine Control Module |
| 13 | TCM – Transmission Control Module |
| 14 | – |
| 15 | – |
| 16 | – |
| 17 | A/C Control |
| 18 | – |
| 19 | Starter Pinion |
| 20 | MCU – Microprocessor Control Unit |
| 21 | – |
| 22 | – |
| 23 | – |
| 24 | – |
| 25 | Starter Motor |
| 26 | Spare |
| 27 | – |
| 28 | – |
| 29 | – |
| 30 | – |
| 31 | – |
| 32 | Spare |
| 33 | Spare |
| 34 | ELM 5 – Exterior Lighting Module 5 |
| 35 | Power Sounder |
| 36 | ELM 4 – Exterior Lighting Module 4 |
| 37 | ELM 3 – Exterior Lighting Module 3 |
| 38 | MSM_E – Memory Seat Module |
| 39 | BSM – Battery State Module |
| 40 | Front Window Switch |
| 41 | RDCM BATT2 – Rear Drive Control Module Battery 2 |
| 42 | Headlamp Right and Headlamp Left |
| 43 | FRT HTD SEAT MDL – Front Heated Seat Module |
| 44 | RFAM & AFL/AHL/RDCM BAT 2 – Radio Frequency Actuator Module and Adaptive Forward Lighting/ Automatic Headlamp Leveling/Rear Drive Control Module Battery 2 |
| 46 | – |
| 47 | – |
| 48 | DC DC BAT 2 – Direct Current Direct Current Battery 2 |
| 49 | – |
| 50 | MTR WDW LIFTER LT – Motor Window Lifter Left |
| 51 | – |
| 52 | Passenger Power Seat |
| 53 | – |
| 54 | TIM1 – Trailer Interface Module 1 |
| 55 | TIM2 – Trailer Interface Module 2 |
| 56 | Trailer Park Lamps |
| 57 | RDCM BATT1 – Rear Drive Control Module Battery 1 |
| 58 | Driver Power Seat |
| 59 | EBCM – Electronic Brake Control Module |
| 60 | Horn |
| 61 | Rear Defog |
| 62 | Front Wiper |
| 63 | Power Tailgate |
| 64 | MTR WDW LIFTER RT -Motor Window Lifter Right |
| 65 | – |
| 66 | Sunroof |
| 67 | Trailer Run |
| 68 | Spare |
| 69 | Spare |
| 70 | – |
| 71 | – |
| 72 | FTZM – Fuel Tank Zone Module |
| 73 | Handsfree Closure |
| 74 | – |
| 75 | Spare |
| 76 | Spare |
| 77 | Spare |
| 78 | Trailer Stop/Turn Left and Right |
| 79 | TCM (DC to DC) -Transmission Control Module |
| 80 | – |
| 81 | SADS – Semi Active Dampening Suspension |
| 82 | – |
| 83 | Washer Pump |
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