Buick LaCrosse (2016-2019) fuses and relays

This material discusses in detail the fuse diagrams of the Buick LaCrosse (third generation): 2016, 2017, 2018, 2019 release.

Fuses F43, F44 and F37 in the interior fuse box are responsible for the 12V power sockets and cigarette lighter.

In the engine compartment


Fuse box located from the driver's side, behind the cover.


General view.

Diagram
No. Description
R4 AC DC inverter relay
R20 Rear 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 headlamps relay
R73 Starter motor
R80 Starter pinion
R90 SAI reaction solenoid
R94 Headlamp washer relay
R98 SAI reaction pump
1 Empty
2 Empty
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 2016-2017: Semi-active damping system
2018-2019 (eAssist): Airbag sensing 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 wipers
17 passenger  power seat unit
18 ABS valve
19 Driver power seat
21 Moonroof
22 Right corner lamp
23 Auto headlamp leveling
24 Empty
26
  • Transmission control unit
  • Ignition
27
  • Instrument panel
  • Ignition
28
  • Electronic precision shift
  • Ignition
29
  • Rear vision camera
  • Air conditioning
30 Malfunction indicator lamp/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 fuse
38 Empty
39 Empty
40 Steering columnn lock
41 Empty
43 Heated steering wheel
44
  • Headlamp leveling
  • Rear seat ventilation
45 Empty
46
  • ECM
  • Ignition
47 Empty
48 Engine boost/Left cooling fan
49 DC DC battery 2/AWD
50 Empty
51 Empty
52 Empty
53 Empty
54 Empty
55 Empty
56 Empty
57 Transmission auxiliary pump
58 TRCM
59 High-beam headlamps
60 Cooling fan
61 Empty
62 Empty
63 Empty
65 A/C HEV
67 Empty
68 Empty
69 Right HID low-beam headlamps
70 Left HID low-beam headlamps
72 Starter pinion
74 Starter motor
75 ECM
76 Powertrain - off engine
77 Empty
78 Horn / Sound Signal
79 Washer pump
81
  • Transmission control module (TCM)
  • Engine control module (ECM)
82 Empty
83 Ignition coils
84 2016-2017: Powertrain - on engine
2018-2019: Coil
85 Engine control module (ECM) switch #2
86 Engine control module (ECM) switch #1
87 SAI reaction pump
88 Aeroshutter
89 Headlamp washer unit
91 Empty
92 TPIM motor generator unit pump
93 Headlamp leveling
95 SAI reaction solenoid
96 Fuel heater module
97 Empty
99 Coolant pump

In the passenger compartment


Fuse box located on the driver's side, behind the plastic cover.


Access example.

Diagram
No. Description
K1 Empty
K2 Retained accessory power
K3 Empty
K4 Empty
K5 Logistics
F1 Power window (Left)
F2 Power window (Right)
F3 Empty
F4 HVAC blower
F5 Battery 2
F6 Electric steering column
F7 Empty
F8 Battery 3
F9
  • Engine control module
  • Battery
F10 BCM #2 On/Off
F11 Empty
F12 Empty
F13 Empty
F14 Empty
F15 Transmission control module 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 (2016-2017)
Airbag sensing diagnostic module / Passenger sensing module (2018-2019)
F25 Diagnostic link connector
F26 Empty
F27 AC DC inverter
F28 Empty
F29 BCM #8
F30 Overhead console
F31 Steering wheel control
F32 Empty
F33 HVAC
F34 Center gateway control unit
F35 Integrated chassis control unit
F36 Charger
F37
  • Auxiliary 12V power outlet
  • Buick LaCrosse cigarette lighter fuse
F38 OnStar system
F39 Monitor
F40 Object detection system
F41 BCM #1 On/Off
F42 Radio
F43 Circuit breaker 1 (2016-2017)
Rear accessory power socket (2018-2019)
F44 Circuit breaker 2 (2016-2017)
Front accessory power socket (2018-2019)
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