Table of Contents
In this article, we provide a detailed overview of the fuse box diagrams for the third-generation Buick LaCrosse: 2016, 2017, 2018, and 2019 model years.
Fuses F43, F44, and F37 in the interior fuse block protect the 12 V power outlets and the cigarette lighter.
Engine Compartment Fuse Block
The fuse block is located on the driver's side, behind the protective cover.
General overview.
| Diagram | |
|---|---|
|
|
| No. | Description |
| R4 | AC/DC inverter relay |
| R20 | Rear window defogger relay |
| R25 | Front wiper control module |
| R31 | Run/Crank relay |
| R37 | Front wiper speed relay |
| R42 | Transmission auxiliary pump |
| R64 | A/C control relay |
| R66 | Powertrain relay |
| R71 | HID low-beam headlamp relay |
| R73 | Starter motor |
| R80 | Starter pinion |
| R90 | Secondary Air Injection (SAI) reaction solenoid |
| R94 | Headlamp washer relay |
| R98 | Secondary Air Injection (SAI) reaction pump |
| 1 | Empty |
| 2 | Empty |
| 3 | Anti-lock Brake System (ABS) pump |
| 5 | AC/DC inverter |
| 6 | Rear closure |
| 7 | Left cornering lamp |
| 8 | Power windows / Rearview mirror / Power seats |
| 9 | Turbocharger boost |
| 10 | 2016–2017: Semi-active damping system |
| 2018–2019 (eAssist): Airbag sensing and diagnostic module / Passenger sensing module | |
| 11 | DC/DC battery 1 |
| 12 | Rear window defogger |
| 13 | Heated mirrors |
| 14 | Empty |
| 15 | Passive entry / Passive start system |
| 16 | Front windshield wipers |
| 17 | Front passenger power seat module |
| 18 | ABS valves |
| 19 | Driver power seat module |
| 21 | Sunroof / Moonroof |
| 22 | Right cornering lamp |
| 23 | Auto headlamp leveling |
| 24 | Empty |
| 26 |
|
| 27 |
|
| 28 |
|
| 29 |
|
| 30 | Malfunction Indicator Lamp (MIL) / Shift solenoid |
| 32 | Canister vent solenoid |
| 33 | Front heated seats |
| 34 | 2016–2017: Rear heated seat / Vehicle body safety module / Energy storage system fan |
| 2018–2019: BSM (eAssist) / Fan control module / Damping control module (SADS) | |
| 35 | Fog lamps |
| 36 | Buick LaCrosse fuel pump |
| 38 | Empty |
| 39 | Empty |
| 40 | Steering column lock |
| 41 | Empty |
| 43 | Heated steering wheel |
| 44 |
|
| 45 | Empty |
| 46 |
|
| 47 | Empty |
| 48 | Turbocharger boost / Left cooling fan |
| 49 | DC/DC battery 2 / All-Wheel Drive (AWD) |
| 50 | Empty |
| 51 | Empty |
| 52 | Empty |
| 53 | Empty |
| 54 | Empty |
| 55 | Empty |
| 56 | Empty |
| 57 | Transmission auxiliary pump |
| 58 | Transmission Range Control Module (TRCM) |
| 59 | High-beam headlamps |
| 60 | Cooling fan |
| 61 | Empty |
| 62 | Empty |
| 63 | Empty |
| 65 | Air conditioning (HEV) |
| 67 | Empty |
| 68 | Empty |
| 69 | Right HID low-beam headlamp |
| 70 | Left HID low-beam headlamp |
| 72 | Starter pinion |
| 74 | Starter motor |
| 75 | Engine Control Module (ECM) |
| 76 | Powertrain – off engine |
| 77 | Empty |
| 78 | Horn |
| 79 | Washer pump |
| 81 |
|
| 82 | Empty |
| 83 | Ignition coils |
| 84 | 2016–2017: Powertrain – on engine |
| 2018–2019: Ignition coil | |
| 85 | Engine Control Module (ECM) switch 2 |
| 86 | Engine Control Module (ECM) switch 1 |
| 87 | Secondary Air Injection (SAI) reaction pump |
| 88 | Active aero shutter |
| 89 | Headlamp washer unit |
| 91 | Empty |
| 92 | Traction Power Inverter Module (TPIM) motor generator unit pump |
| 93 | Headlamp leveling |
| 95 | Secondary Air Injection (SAI) reaction solenoid |
| 96 | Fuel heater module |
| 97 | Empty |
| 99 | Coolant pump |
Passenger Compartment Fuse Block
The fuse block is located on the driver's side, behind the plastic interior cover.
Access location.
| Diagram | |
|---|---|
|
|
| No. | Description |
| K1 | Empty |
| K2 | Retained Accessory Power (RAP) |
| K3 | Empty |
| K4 | Empty |
| K5 | Logistics |
| F1 | Power window (Left) |
| F2 | Power window (Right) |
| F3 | Empty |
| F4 | HVAC blower motor |
| F5 | Battery 2 |
| F6 | Electric steering column |
| F7 | Empty |
| F8 | Battery 3 |
| F9 |
|
| F10 | Body Control Module (BCM) 2 On/Off |
| F11 | Empty |
| F12 | Empty |
| F13 | Empty |
| F14 | Empty |
| F15 | Transmission Control Module (TCM) On/Off |
| F16 | Audio amplifier |
| F17 | Empty |
| F18 | Battery 7 |
| F19 | Empty |
| F20 | Battery 1 |
| F21 | Battery 4 |
| F22 | Battery 6 |
| F23 | Electric steering column lock |
| F24 | Sensing and Diagnostic Module (SDM) (2016–2017) |
| Airbag sensing and diagnostic module / Passenger sensing module (2018–2019) | |
| F25 | Data Link Connector (DLC) |
| F26 | Empty |
| F27 | AC/DC inverter |
| F28 | Empty |
| F29 | Body Control Module (BCM) 8 |
| F30 | Overhead console |
| F31 | Steering wheel controls |
| F32 | Empty |
| F33 | HVAC module |
| F34 | Central gateway control module |
| F35 | Integrated chassis control module |
| F36 | Charger |
| F37 |
|
| F38 | OnStar system |
| F39 | Monitor |
| F40 | Object detection system |
| F41 | Body Control Module (BCM) 1 On/Off |
| F42 | Radio |
| F43 | Circuit breaker 1 (2016–2017) |
| Rear auxiliary 12 V power outlet (2018–2019) | |
| F44 | Circuit breaker 2 (2016–2017) |
| Front auxiliary 12 V power outlet (2018–2019) | |