Cadillac XT4 (2019 – 2021) – fuse and relay box diagram
Year of production: 2019, 2020, 2021
Passenger Compartment
Fuse box Location
The fuse box is located on the driver’s side of the instrument panel behind the cover.
Fuse Box Diagram
Assignment of the fuses in the passenger compartment
| № | 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 |
Engine Compartment
Fuse Box Location
The instrument panel fuse block is in the center console between the driver and passenger seats.
Fuse Box Diagram
Assignment of the fuses in the engine compartment
| № | 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 |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.