Fuses and relays Buick LaCrosse (2016-2019)

In this article, we will take a detailed look at the fuse diagrams for 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)