The Buick Regal, produced from 2018 to 2020, is showcasing Buick’s commitment to combining elegance with cutting-edge technology in the mid-size sedan and hatchback segments. The vehicle’s advanced electrical system includes essential components such as the fuse box and relays.
The fuse box in the Buick Regal 2018–2020 is housing fuses that protect electrical circuits from overloads and short circuits, safeguarding critical components like headlights, taillights, and power windows. Relays, operating as electrically controlled switches, are managing the flow of electricity to systems such as the starter motor, fuel pump, and cooling fans, ensuring efficient and reliable operation.
Additional sophisticated electrical components in the Buick Regal of this era include advanced infotainment systems, climate control features, power-adjustable seats, and advanced driver assistance systems (ADAS). These features are relying on a robust electrical infrastructure to enhance comfort, convenience, and safety for occupants.
Understanding the layout and function of the fuse box and relays is crucial for maintaining and troubleshooting the Buick Regal 2018–2020’s electrical systems. Regular inspection and maintenance of these components are helping ensure the vehicle’s reliability and performance, continuing its legacy as a sophisticated and dependable vehicle in Buick’s lineup.
(2018-2020) Buick Regal fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Buick Regal 2018-2020 fuse assignment
Year of production: 2018, 2019, 2020
Passenger compartment fuse box
It is located in the left side of the dashboard, behind the cover.
Engine compartment
Fuse box diagrams
2018, 2019, 2020
Passenger compartment
Assignment of the fuses and relays in the Passenger compartment
| № | Description |
|---|---|
| F1 | Left window |
| F2 | Right window |
| F3 | Not used |
| F4 | HVAC blower |
| F5 | Battery 2 |
| F6 | Electric steering column |
| F7 | Not used |
| F8 | Battery 3 |
| F9 | Engine control module/Battery |
| F10 | Body control module 2 On/Off |
| F11 | Not used |
| F12 | Not used |
| F13 | Not used |
| F14 | Not used |
| F15 | Transmission control module On/Off |
| F16 | Amplifier |
| F17 | Not used |
| F18 | Battery 7 |
| F19 | Not used |
| F20 | Battery 1 |
| F21 | Battery 4 |
| F22 | Battery 6 |
| F23 | Electric steering column lock |
| F24 | Airbag sensing diagnostic module/Passenger sensing module |
| F25 | Diagnostic link |
| F26 | Not used |
| F27 | AC DC inverter |
| F28 | Not used |
| F29 | Body control module 8 |
| F30 | Overhead console |
| F31 | Steering wheel control |
| F32 | Not used |
| F33 | HVAC |
| F34 | Center gateway module |
| F35 | Integrated chassis control module |
| F36 | Charger |
| F37 | Auxiliary power outlet/Cigar lighter |
| F38 | OnStar |
| F39 | Monitor |
| F40 | Object detection |
| F41 | Body control module 1 On/Off |
| F42 | Radio |
| F43 | Rear accessory power outlet |
| F44 | Front accessory power outlet |
| Relays | |
| K1 | Not used |
| K2 | Retained accessory power |
| K3 | Not used |
| K4 | Not used |
| K5 | Logistics |
Engine compartment
Assignment of the fuses and relays in the engine compartment
| № | Description |
|---|---|
| 1 | Not used |
| 2 | Not used |
| 3 | ABS pump |
| 5 | Not used |
| 6 | Rear closure |
| 7 | Fog lamp |
| 8 | Memory control module |
| 9 | Heated windshield |
| 10 | Seat lumbar |
| 11 | DC DC converter 1 |
| 12 | Rear window defogger |
| 13 | Heated mirrors |
| 14 | Not used |
| 15 | Not used |
| 16 | Front wipers |
| 17 | Passenger power seat |
| 18 | Sun shade |
| 19 | Driver power seat |
| 21 | Sunroof |
| 22 | Rear wiper |
| 23 | Auto headlamp leveling |
| 24 | Not used |
| 26 | Transmission control module/Ignition |
| 27 | Instrument panel/Ignition |
| 28 | Not used |
| 29 | Rear vision camera/Ventilation |
| 30 | Malfunction indicator lamp/Shift solenoid |
| 32 | Canister vent/Video processing module |
| 33 | Front heated seats |
| 34 | Rear heated seats |
| 35 | All wheel drive damping control |
| 36 | Fuel module |
| 38 | Not used |
| 39 | Not used |
| 40 | Steering column lock |
| 41 | Not used |
| 43 | Heated steering wheel |
| 44 | Headlamp leveling |
| 45 | Not used |
| 46 | Engine control module/Ignition |
| 47 | Not used |
| 48 | Cooling fan/DC DC converter 2 |
| 49 | RDCM |
| 50 | Not used |
| 51 | Not used |
| 52 | Not used |
| 53 | Not used |
| 54 | Not used |
| 55 | Not used |
| 56 | Starter |
| 57 | Not used |
| 58 | Not used |
| 59 | Left LED lamps |
| 60 | Cooling fan |
| 61 | Not used |
| 62 | Not used |
| 63 | Not used |
| 65 | A/C HEV |
| 67 | Not used |
| 68 | Not used |
| 69 | Right LED lamp/Right high-beam headlamps |
| 70 | Left high-beam headlamps |
| 72 | Starter pinion |
| 74 | Not used |
| 75 | Engine control module |
| 76 | Powertrain – off engine |
| 77 | Not used |
| 78 | Horn |
| 79 | Washer pump |
| 81 | Transmission control module/ Engine control module |
| 82 | Not used |
| 83 | Ignition coils |
| 84 | Coil |
| 85 | Shunt 60A |
| 86 | Not used |
| 87 | SAI fuel heater |
| 88 | Aeroshutter |
| 89 | Not used |
| 91 | Not used |
| 92 | TPIM motor generator/TPIM |
| 93 | Keyless entry control module |
| 95 | Water change air coolant pump |
| 96 | Fuel heater |
| 97 | Not used |
| 99 | Not used |
| Relays | |
| 4 | Not used |
| 20 | Rear window defogger |
| 25 | Front wiper control |
| 31 | Run/Crank |
| 37 | Front wiper speed |
| 42 | Not used |
| 64 | Starter motor |
| 66 | Powertrain |
| 71 | Right LED high beam |
| 73 | AC clutch |
| 80 | Starter pinion |
| 90 | Water change air coolant pump |
| 94 | Not used |
| 98 | Fuel heater |
Conclusion
For owners and enthusiasts of classic Buick Regal models from 2018-2020, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Buick’s craftsmanship and innovation in the automotive industry during that era.
