The Buick Enclave, produced from 2018 to 2021, exemplifies Buick’s commitment to blending luxury, comfort, and advanced technology in the mid-size SUV segment. Its advanced electrical system includes essential components such as the fuse box and relays.
The fuse box in the Buick Enclave 2018–2021 houses fuses designed to protect electrical circuits from overloads and short circuits, ensuring the safety of critical components like headlights, taillights, and power windows. Relays, serving as electrically controlled switches, manage 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 Enclave of this era include advanced infotainment systems, climate control features, power-adjustable seats, and advanced driver assistance systems (ADAS). These features rely 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 Enclave 2018–2021’s electrical systems. Regular inspection and maintenance of these components help ensure the vehicle’s reliability and performance, maintaining its reputation as a luxurious and dependable SUV in Buick’s lineup.
(2018-2021) Buick Enclave 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 Enclave 2018-2021 fuse assignment
- Cigar lighter / power outlet fuses in the Buick Enclave are the fuses №. 37 (Power outlet/ Wireless charger/ Accessory), №. 42 (Auxiliary power outlet/Lighter) in the Passenger compartment fuse box, and fuse CB3 (Rear auxiliary power outlet) in the Rear compartment fuse box.
Year of production: 2018, 2019, 2020, 2021
Passenger compartment
It is located inside the center console on the passenger side, behind the cover.
Engine compartment
Luggage compartment
It is located in the left side of the rear compartment, behind the trim panel.
Fuse box diagrams
Passenger compartment
Assignment of the fuses in the Passenger compartment
| № | Description |
|---|---|
| F1 | Body control module 6 |
| F2 | Diagnostic link |
| F3 | Electric steering column lock |
| F4 | Rear USB port |
| F5 | 2021: Rear sunshade / Park/Reverse/Neutral/Drive/Low |
| F6 | Heating, ventilation, and air conditioning |
| F7 | Body control module 3 |
| F8 | 2021: Adaptive front lighting system |
| F9 | Right front heated seat |
| F10 | Airbag |
| F11 | 2018-2020: Electronic precision shift |
| F12 | Amplifier |
| F13 | Body control module 7 |
| F14 | Left front heated seat |
| F15 | Not Used |
| F16 | Sunroof |
| F17 | Communication gateway module |
| F18 | 2018-2020: Instrument cluster 2021: Instrument cluster / Head-up display |
| F19 | Body control module 1 |
| F20 | Wireless charger module |
| F21 | Body control module 4 |
| F22 | Infotainment |
| F23 | Body control module 2 |
| F24 | 2021: Park/Reverse/Neutral/Drive/Low |
| F25 | 2018-2020: Park assist 2021: Park assist/Shifter interface board |
| F26 | Communications integration module |
| F27 | Video |
| F28 | Radio/Heating, ventilation, and air conditioning display |
| F29 | Radio |
| F30 | Steering wheel controls |
| F31 | Front blower |
| F32 | DC AC inverter |
| F33 | Driver power seat |
| F34 | Passenger power seat |
| F35 | Feed/Body control module 4 |
| F36 | Electric power steering |
| F37 | Power outlet/ Wireless charger/ Accessory |
| F38 | Body control module 8 |
| F39 | Steering wheel controls backlighting |
| F40 | Not Used (Circuit Breaker) |
| F41 | Not Used (Circuit Breaker) |
| F42 | Auxiliary power outlet / Lighter |
Engine compartment
Assignment of the fuses and relays in the engine compartment
| № | Description |
|---|---|
| F1 | Antilock brake system pump |
| F2 | Starter 1 |
| F3 | DC DC transformer 1 |
| F4 | Not Used |
| F5 | DC DC transformer 2 |
| F6 | Not Used |
| F7 | Not Used |
| F8 | Not Used |
| F9 | Vacuum pump |
| F10 | Front wiper |
| F11 | Not Used |
| F12 | Not Used |
| F13 | Starter 2 |
| F14 | Not Used |
| F15 | Rear wiper |
| F20 | Not Used |
| F21 | Not Used |
| F22 | Electronic brake control module |
| F23 | Parking/Trailer lamps |
| F24 | Right trailer stoplamp/Turn signal lamp |
| F25 | Steering column lock |
| F26 | Not Used |
| F27 | Left trailer stoplamp/Turn signal lamp |
| F28 | Not Used |
| F29 | Not Used |
| F30 | Washer pump |
| F31 | Not Used |
| F32 | Left low-beam headlamp |
| F33 | Front fog lamps |
| F34 | Horn |
| F35 | Not Used |
| F36 | Not Used |
| F37 | Right low-beam headlamp |
| F38 | Automatic headlamp leveling motor |
| F39 | Transmission control module |
| F40 | Left rear bus electrical center/ Ignition |
| F41 | Instrument cluster |
| F42 | Heating, ventilation, and air conditioning |
| F43 | 2018-2020: Head-up display 2021: Head-up display/ Reflective light auxiliary display |
| F44 | Communication gateway module/ Run/Crank |
| F45 | Not Used |
| F46 | Not Used |
| F47 | Not Used |
| F48 | Not Used |
| F49 | Interior rearview mirror |
| F50 | 2018-2020: Fuel system control module 2021: Fuel system control module / Shifter interface board / Run/Crank |
| F51 | Heated steering wheel |
| F52 | Folding seats switch |
| F53 | 2021: Coolant pump |
| F54 | 2018-2020: Coolant pump |
| F55 | Air conditioning clutch |
| F56 | 2018-2020: Integrated chassis control module |
| F57 | Engine control module/lgnition |
| F58 | Transmission control module/ Ignition |
| F59 | Engine control module battery |
| F60 | Engine control module-even |
| F61 | O2 sensor 1/MAF |
| F62 | Not Used |
| F63 | O2 sensor 2/ Canister/Engine oil/ Turbo |
| F64 | Aeroshutter |
| F65 | Engine control module powertrain 1 |
| F66 | Engine control module powertrain 2 |
| F67 | Engine control module-odd |
| F68 | Not Used |
| F69 | Not Used |
| F70 | Not Used |
| F71 | Not Used |
| F72 | Not Used |
| F73 | Not Used |
| F74 | Not Used |
| F75 | Not Used |
| F76 | Not Used |
| F77 | Not Used |
| Relays | |
| K1 | Starter 1 |
| K2 | Run/Crank |
| K3 | Vacuum pump |
| K4 | Not Used |
| K5 | Air conditioning |
| K6 | 2018-2020: Coolant pump |
| K7 | Engine control module |
| K8 | Folding seats |
| K9 | Not Used |
| K10 | Starter 2 |
Luggage compartment
Assignment of the fuses and relays in the Rear compartment
| № | Description |
|---|---|
| F1 | Not Used |
| F2 | Trailer |
| F3 | Folding seats |
| F4 | Rear blower |
| F5 | Rear drive control |
| F6 | Not Used |
| F7 | Right window |
| F8 | Rear defogger |
| F9 | Left window |
| F10 | Not Used |
| F11 | Trailer reverse |
| F12 | USB port/Third row seats |
| F13 | Not Used |
| F14 | Not Used |
| F15 | Not Used |
| F16 | Not Used |
| F17 | Camera |
| F18 | Not Used |
| F19 | 2018-2019: Ventilated seats 2020-2021: Ventilated seats / Massage |
| F24 | Lumbar |
| F25 | Not Used |
| F26 | Trailer brake lamps |
| F27 | 2018-2019: Not Used 2020-2021: Massage |
| F28 | Passive entry/ Passive start |
| F29 | Not Used |
| F30 | Canister vent |
| F31 | Not Used |
| F32 | Heated mirrors |
| F33 | USB port/Second row seats |
| F34 | Liftgate module |
| F35 | 2018-2020: Fuel system control module 2021: Fuel system control module / Fuel tank zone module. |
| F36 | Not Used |
| F37 | Not Used |
| F38 | Window module |
| F39 | Rear closure |
| F40 | Memory seat module |
| F41 | Automatic occupancy sensor |
| F42 | Not Used |
| F43 | Not Used |
| F44 | Not Used |
| F45 | Liftgate motor |
| F46 | Rear heated seats |
| F47 | Not Used |
| F48 | Not Used |
| F49 | Not Used |
| F50 | Not Used |
| F51 | Not Used |
| F52 | Semi-active dampening system module |
| F53 | Not Used |
| F54 | External object calculating remote system/Side blind zone alert |
| F56 | Universal remote system/Overhead console |
| F57 | Hands free closure release |
| CB1 | Not Used (Circuit Breaker) |
| CB2 | Not Used (Circuit Breaker) |
| CB3 | Rear auxiliary power outlet (Circuit Breaker) |
| Relays | |
| K1 | Not Used |
| K2 | Not Used |
Conclusion
For owners and enthusiasts of classic Buick Enclave models from 2018-2021, 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.
