Buick LaCrosse Fuse Box: What Each Fuse Does
From the 2019 Buick LaCrosse owner's manual. 2 fuse boxes listed.
Engine compartment fuse block
| Fuse | Circuit |
|---|---|
| 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/Ignition |
| 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/Ignition |
| 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 |
Rear compartment fuse block
| Fuse | Circuit |
|---|---|
| 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 |
Listings are copied as text from the manual's fuse tables (AI-assisted; every circuit name was matched against the cited pages 2026-10-18). Fuse layouts can differ by trim and year; check the label on the fuse box cover before replacing a fuse, and always use the same amp rating.
Confirm with your own manual, dipstick or door-jamb label.
Report a problem with this page →