Page Contents:
In this article, you will find information about the fuses of the Buick LaCrosse (models 2017, 2018, and 2019), including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.
Checking and Replacing Fuses in Buick LaCrosse
The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of damage caused by electrical problems.
To check a fuse, look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a new one of the identical size and rating. Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse as soon as possible.
Caution!
- Fuses and circuit breakers are marked with their ampere rating. Do not exceed the specified amperage rating when replacing fuses and circuit breakers. Use of an oversized fuse or circuit breaker can result in a vehicle fire.
- Before replacing a fuse, turn every vehicle electrical switch off.
- Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.
Location of Fuse Boxes
Engine Compartment Fuse Block:
To remove the fuse block cover, squeeze the three retaining clips on the cover and lift it straight up.
Instrument Panel Fuse Block:
The instrument panel fuse block is in the instrument panel, on the driver side of the vehicle. To operate the fuses, open the fuse panel by pulling down at the top. Pull the panel toward you to release it from the hinges.
Fuse Box Diagrams
2017
Engine Compartment Fuse Block
| № | Usage |
|---|---|
| 1 | - |
| 2 | - |
| 3 | ABS pump |
| 5 | AC DC inverter |
| 6 | Rear closure |
| 7 | Left corner lamp |
| 8 | Power windows / Rearview mirror / Power seats |
| 9 | Engine boost |
| 10 | Semi-active damping system |
| 11 | DC DC Battery 1 |
| 12 | Rear window defogger |
| 13 | Heated mirrors |
| 14 | - |
| 15 | Passive entry / Passive start |
| 16 | Front wipers |
| 17 | Passenger power seat |
| 18 | ABS valve |
| 19 | Driver power seat |
| 21 | Sunroof |
| 22 | Right corner lamp |
| 23 | Auto headlamp leveling |
| 24 | - |
| 26 | Transmission control module / lgnition |
| 27 | Instrument panel / Ignition |
| 28 | Electronic precision shift / lgnition |
| 29 | Rear vision camera / Ventilation |
| 30 | Malfunction indicator lamp / Shift solenoid |
| 32 | Canister vent solenoid |
| 33 | Front heated seats |
| 34 | Rear heated seat / Vehicle body safety module / Energy storage system fan |
| 35 | Fog lamps |
| 36 | Fuel module |
| 38 | - |
| 39 | - |
| 40 | Steering columnn lock |
| 41 | - |
| 43 | Heated steering wheel |
| 44 | Headlamp leveling / Rear seat ventilation |
| 45 | - |
| 46 | Engine control module / lgnition |
| 47 | - |
| 48 | Engine boost / Left cooling fan |
| 49 | DC DC battery 2 / AWD |
| 50 | - |
| 51 | - |
| 52 | - |
| 53 | - |
| 54 | - |
| 55 | - |
| 56 | - |
| 57 | Transmission auxiliary pump |
| 58 | TRCM |
| 59 | High-beam headlamps |
| 60 | Cooling fan |
| 61 | - |
| 62 | - |
| 63 | - |
| 65 | A/C HEV |
| 67 | - |
| 68 | - |
| 69 | Right HID low-beam headlamps |
| 70 | Left HID low-beam headlamps |
| 72 | Starter pinion |
| 74 | Starter motor |
| 75 | Engine control module |
| 76 | Powertrain - off engine |
| 77 | - |
| 78 | Horn |
| 79 | Washer pump |
| 81 | Transmission control module / Engine control module |
| 82 | - |
| 83 | Ignition coils |
| 84 | Powertrain - on engine |
| 85 | Engine control module switch 2 |
| 86 | Engine control module switch 1 |
| 87 | SAI reaction pump |
| 88 | Aeroshutter |
| 89 | Headlamp washer |
| 91 | - |
| 92 | TPIM motor generator unit pump |
| 93 | Headlamp leveling |
| 95 | SAI reaction solenoid |
| 96 | Fuel heater |
| 97 | - |
| 99 | Coolant pump |
| 4 | AC DC inverter |
| 20 | Rear defogger |
| 25 | Front wiper control |
| 31 | Run/Crank |
| 37 | Front wiper speed |
| 42 | Transmission auxiliary pump |
| 64 | A/C control |
| 66 | Powertrain |
| 71 | HID low-beam headlamps |
| 73 | Starter motor |
| 80 | Starter pinion |
| 90 | SAI reaction solenoid |
| 94 | Headlamp washer |
| 98 | SAI reaction pump |
Instrument Panel Fuse Block
| № | Usage |
|---|---|
| F1 | Left window |
| F2 | Right window |
| F3 | - |
| F4 | HVAC blower |
| F5 | Battery 2 |
| F6 | Electric steering column |
| F7 | - |
| F8 | Battery 3 |
| F9 | Engine control module / Battery |
| F10 | Body control module 2 On/Off |
| F11 | - |
| F12 | - |
| F13 | - |
| F14 | - |
| F15 | Transmission control module On/Off |
| F16 | Amplifier |
| F17 | - |
| F18 | Battery 7 |
| F19 | - |
| F20 | Battery 1 |
| F21 | Battery 4 |
| F22 | Battery 6 |
| F23 | Electric steering column lock |
| F24 | Sensing and diagnostic module |
| F25 | Diagnostic link |
| F26 | - |
| F27 | AC DC inverter |
| F28 | - |
| F29 | Body control module 8 |
| F30 | Overhead console |
| F31 | Steering wheel control |
| F32 | - |
| 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 |
| K1 | - |
| K2 | Retained accessory power |
| K3 | - |
| K4 | - |
| K5 | Logistics |
2018
Engine Compartment Fuse Block
| № | Usage |
|---|---|
| 1 | - |
| 2 | - |
| 3 | ABS pump |
| 5 | AC DC inverter |
| 6 | Rear closure |
| 7 | Left corner lamp |
| 8 | Power windows / Rearview mirror / Power seats |
| 9 | Engine boost |
| 10 | Airbag sensing diagnostic module / Passenger sensing module - eAssist |
| 11 | DC DC Battery 1 |
| 12 | Rear window defogger |
| 13 | Heated mirrors |
| 14 | - |
| 15 | Passive entry/Passive start |
| 16 | Front wipers |
| 17 | Passenger power seat |
| 18 | ABS valve |
| 19 | Driver power seat |
| 21 | Sunroof |
| 22 | Right corner lamp |
| 23 | Auto headlamp leveling |
| 24 | - |
| 26 | Transmission control module / lgnition |
| 27 | Instrument panel / Ignition |
| 28 | Electronic precision shift / lgnition |
| 29 | Rear vision camera / Ventilation |
| 30 | Malfunction indicator lamp / Shift solenoid |
| 32 | Canister vent solenoid |
| 33 | Front heated seats |
| 34 | BSM (eAssist) / Fan control module / Damping control module (SADS) |
| 35 | Fog lamps |
| 36 | Fuel module |
| 38 | - |
| 39 | - |
| 40 | Steering columnn lock |
| 41 | - |
| 43 | Heated steering wheel |
| 44 | Headlamp leveling / Rear seat ventilation |
| 45 | - |
| 46 | Engine control module / lgnition |
| 47 | - |
| 48 | Engine boost / Left cooling fan |
| 49 | DC DC battery 2 / AWD |
| 50 | - |
| 51 | - |
| 52 | - |
| 53 | - |
| 54 | - |
| 55 | - |
| 56 | - |
| 57 | Transmission auxiliary pump |
| 58 | TRCM |
| 59 | High-beam headlamps |
| 60 | Cooling fan |
| 61 | - |
| 62 | - |
| 63 | - |
| 65 | A/C HEV |
| 67 | - |
| 68 | - |
| 69 | Right HID low-beam headlamps |
| 70 | Left HID low-beam headlamps |
| 72 | Starter pinion |
| 74 | Starter motor |
| 75 | Engine control module |
| 76 | Powertrain - off engine |
| 77 | - |
| 78 | Horn |
| 79 | Washer pump |
| 81 | Transmission control module / Engine control module |
| 82 | - |
| 83 | Ignition coils |
| 84 | Coil |
| 85 | Engine control module switch 2 |
| 86 | Engine control module switch 1 |
| 87 | SAI reaction pump |
| 88 | Aerosh utter |
| 89 | Headlamp washer |
| 91 | - |
| 92 | TPIM motor generator unit pump |
| 93 | Headlamp leveling |
| 95 | SAI reaction solenoid |
| 96 | Fuel heater |
| 97 | - |
| 99 | Coolant pump |
| 4 | AC DC inverter |
| 20 | Rear defogger |
| 25 | Front wiper control |
| 31 | Run/Crank |
| 37 | Front wiper speed |
| 42 | Transmission auxiliary pump |
| 64 | A/C control |
| 66 | Powertrain |
| 71 | HID low-beam headlamps |
| 73 | Starter motor |
| 80 | Starter pinion |
| 90 | SAI reaction solenoid |
| 94 | Headlamp washer |
| 98 | SAI reaction pump |
Instrument Panel Fuse Block
| № | Usage |
|---|---|
| F1 | Left window |
| F2 | Right window |
| F3 | - |
| F4 | HVAC blower |
| F5 | Battery 2 |
| F6 | Electric steering column |
| F7 | - |
| F8 | Battery 3 |
| F9 | Engine control module / Battery |
| F10 | Body control module 2 On/Off |
| F11 | - |
| F12 | - |
| F13 | - |
| F14 | - |
| F15 | Transmission control module On/Off |
| F16 | Amplifier |
| F17 | - |
| F18 | Battery 7 |
| F19 | - |
| 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 | - |
| F27 | AC DC inverter |
| F28 | - |
| F29 | Body control module 8 |
| F30 | Overhead console |
| F31 | Steering wheel control |
| F32 | - |
| 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 |
| K1 | - |
| K2 | Retained accessory power |
| K3 | - |
| K4 | - |
| K5 | Logistics |
2019
Engine Compartment Fuse Block
| № | Usage |
|---|---|
| 1 | - |
| 2 | - |
| 3 | Antilock brake system pump |
| 5 | - |
| 6 | Rear closure |
| 7 | Left corner lamp |
| 8 | Power windows / Rearview mirror / Power seats |
| 9 | Electric brake boost / Pedestrian alert |
| 10 | Airbag sensing diagnostic module / Passenger sensing module - eAssist |
| 11 | DC DC Battery 1 |
| 12 | Rear window defogger |
| 13 | Heated mirrors |
| 14 | - |
| 15 | Passive entry / Passive start |
| 16 | Front wipers |
| 17 | Passenger power seat |
| 18 | Antilock brake system valve |
| 19 | Driver power seat |
| 21 | Sunroof |
| 22 | Right corner lamp |
| 23 | Auto headlamp leveling |
| 24 | - |
| 26 | Transmission control module / lgnition |
| 27 | Instrument panel / Ignition |
| 28 | - |
| 29 | Rear vision camera / Ventilated seats |
| 30 | Malfunction indicator lamp / Shift solenoid |
| 32 | Canister vent solenoid |
| 33 | Front heated seats |
| 34 | Battery system manager / Fan control module / Rear drive control module / Damping control module |
| 35 | Fog lamps |
| 36 | Fuel module |
| 38 | - |
| 39 | - |
| 40 | Steering columnn lock |
| 41 | - |
| 43 | Heated steering wheel |
| 44 | Headlamp leveling / Rear seat ventilation |
| 45 | - |
| 46 | Engine control module / lgnition |
| 47 | - |
| 48 | Electric brake boost / Left cooling fan |
| 49 | DC DC battery 2 / Rear drive control module |
| 50 | - |
| 51 | - |
| 52 | - |
| 53 | - |
| 54 | - |
| 55 | - |
| 56 | - |
| 57 | Transmission auxiliary pump |
| 58 | Transmission range control module |
| 59 | High-beam headlamps |
| 60 | Cooling fan |
| 61 | - |
| 62 | - |
| 63 | - |
| 65 | Air conditioning (HEV) |
| 67 | - |
| 68 | - |
| 69 | Right HID low-beam headlamps |
| 70 | Left HID low-beam headlamps |
| 72 | Starter pinion |
| 74 | Starter motor |
| 75 | Engine control module |
| 76 | Powertrain - off engine |
| 77 | - |
| 78 | Horn |
| 79 | Washer pump |
| 81 | Transmission control module / Engine control module |
| 82 | - |
| 83 | Ignition coil - odd |
| 84 | Ignition coil - even |
| 85 | Shunt |
| 86 | Shunt |
| 87 | - |
| 88 | Aeroshutter |
| 89 | Headlamp washer |
| 91 | - |
| 92 | Traction power inverter module / Motor generator unit coolant motor |
| 93 | Headlamp leveling |
| 95 | - |
| 96 | - |
| 97 | - |
| 99 | Coolant pump |
| 4 | - |
| 20 | Rear defogger |
| 25 | Front wiper control |
| 31 | Run/Crank |
| 37 | Front wiper speed |
| 42 | Transmission auxiliary pump |
| 64 | Air conditioning control |
| 66 | Powertrain |
| 71 | HID low-beam headlamps |
| 73 | Starter motor |
| 80 | Starter pinion |
| 90 | - |
| 94 | Headlamp washer |
| 98 | - |
Instrument Panel Fuse Block
| № | Usage |
|---|---|
| F1 | Left window |
| F2 | Right window |
| F3 | - |
| F4 | Heating ventilation & air conditioning blower motor |
| F5 | Body control module 2 |
| F6 | Electric steering column |
| F7 | - |
| F8 | Body control module 3 |
| F9 | Engine control module / Battery |
| F10 | Body control module 2 (stop/start) |
| F11 | - |
| F12 | - |
| F13 | - |
| F14 | - |
| F15 | Transmission control module (stop/start) |
| F16 | Amplifier |
| F17 | - |
| F18 | Body control module 7 |
| F19 | - |
| F20 | Body control module 1 |
| F21 | Body control module 4 |
| F22 | Body control module 6 |
| F23 | Electric steering column lock |
| F24 | Airbag sensing diagnostic module / Passenger sensing module |
| F25 | Data link connector |
| F26 | - |
| F27 | AC DC inverter |
| F28 | HID headlamps |
| F29 | Body control module 8 |
| F30 | Overhead console |
| F31 | Steering wheel control |
| F32 | - |
| F33 | Heating, ventilation & air conditioning |
| F34 | Communication gateway module |
| F35 | Integrated chassis control module |
| F36 | Charger |
| F37 | Auxiliary power outlet / Cigar lighter |
| F38 | OnStar |
| F39 | Display |
| F40 | Obstacle detection |
| F41 | Body control module 1 (stop/start) |
| F42 | Radio |
| F43 | Rear accessory power outlet |
| F44 | Front accessory power outlet |
| K1 | - |
| K2 | Retained accessory power |
| K3 | - |
| K4 | - |
| K5 | Logistics |