X50A Fuse Block - Underhood Top View

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of GENERAL MOTORS COMPANY

Usage Table

No.	Device Label Name	Device Assigned Name	Rating	Description
Mega Fuses
MEGA	-	MEGA	125A	X52A Fuse Block - Passenger Compartment
Mini Fuses
3	RT STOP/TRN TRLR	F3UA	15A	X88 Trailer Connector
4	SPARE	F4UA	10A	Not Used
5	SPARE	F5UA	10A	Not Used
6	FSCM IGN	F6UA	10A	E11A Fuel Heater/Water in Fuel Sensor (LWN) K38 Chassis Control Module (LV1/L96/LC8)
7	BCM-5	F7UA	10A	K9 Body Control Module
8	BCM-7	F8UA	10A	K9 Body Control Module
9	BCM-4	F9UA	10A	K9 Body Control Module
10	IPC	F10UA	10A	P16 Instrument Cluster
11	TRLR WRG	F11UA	30A	W8 Blunt Cut - Trailer Provision (UY7)
12	SPARE	F12UA	10A	Not Used
13	DISPLY MIR/REAR B/U CAMERA	F13UA	10A	A10 Inside Rearview Mirror (UVC) B87 Rearview Camera (UVC)
14	WASH	F14UA	15A	G24 Windshield Washer Pump
16	HORN	F16UA	20A	P13 Horn Assembly
17	TRANS	F17UA	15A	Not Used
18	A/C CMPRSR	F18UA	15A	Q2 A/C Compressor Clutch (C60)
19	ECM BATT	F19UA	10A	K20 Engine Control Module
20	CUTAWAY LH STP/TRN LAMP	F20UA	10A	X405
21	LT STOP/TRN TRLR	F21UA	15A	X88 Trailer Connector
22	CUTAWAY RH STP/TRN LAMP	F22UA	10A	X405
23	NOX SENSOR	F23UA	15A	B136 Exhaust Particulate Matter Sensor (LWN) B195A Nitrogen Oxides Sensor 1 (LWN) B195B Nitrogen Oxides Sensor 2 (LWN)
24	DIESEL FUEL PUMP	F24UA	20A	A7 Fuel Pump and Level Sensor Assembly (LWN)
25	AUX PWR OUTLET	F25UA	20A	X80B Accessory Power Receptacle - Center Console 2
26	BCM-3	F26UA	10A	K9 Body Control Module
27	SEO	F27UA	10A	P16 Instrument Cluster
28	AIRBAG	F28UA	10A	K36 Inflatable Restraint Sensing and Diagnostic Module S40 Passenger Air Bag Disable Switch (C99)
29	STR/WHL/SNSR	F29UA	10A	Not Used
30	ECM IGN/GLOW PLUG MDL IGN	F30UA	15A	K20 Engine Control Module
31	TCM IGN	F31UA	15A	K71 Transmission Control Module (M5U) T12 Automatic Transmission Assembly (MYD)
32	TCM BATT	F32UA	10A	K20 Engine Control Module (LV1) T12 Automatic Transmission Assembly (MYD)
33	OBSDET	F33UA	10A	B218L Side Object Sensor Module - Left (UFT) B218R Side Object Sensor Module - Right (UFT) K182 Parking Assist Control Module (UD7)
34	NOX SENSOR	F34UA	15A	K115 Reductant Control Module (LWN) KR121B Reductant Control Module Relay 2 (LWN)
35	FOH MDL	F35UA	15A	E19 Coolant Heater (K08)
36	FSCM BATT	F36UA	25A	K38 Chassis Control Module (LV1/L96/LC8)
43	EV FAN CLUTCH	F43UA	10A	KR20F Cooling Fan Relay (LWN) Q85 Cooling Fan Clutch (LWN)
51	LT HI BEAM	F51UA	10A	E4E Headlamp - Left High Beam (V22) E13L Headlamp - Left (Without V22)
52	RT HI BEAM	F52UA	10A	E4F Headlamp - Right High Beam (V22) E13R Headlamp - Right (Without V22)
53	LT LO BEAM	F53UA	10A	E4G Headlamp - Left Low Beam (V22) E13L Headlamp - Left (Without V22)
54	RT LO BEAM	F54UA	10A	E4H Headlamp - Right Low Beam (V22) E13R Headlamp - Right (Without V22)
55	WPR	F55UA	25A	KR12B Windshield Wiper Relay
56	CNSTR VENT SOL	F56UA	10A	Q13 Evaporative Emission Vent Solenoid Valve (LV1/L96/LC8)
58	BCM-2	F58UA	10A	K9 Body Control Module
59	BCM-1	F59UA	10A	K9 Body Control Module
61	CCV HTR/ENG OIL SOL	F61UA	15A	E45 Positive Crankcase Ventilation Heater (LWN) Q44 Engine Oil Pressure Control Solenoid Valve (LV1)
62	O2 SNSR 2 (POST)/EV FAN	F62UA	10A	B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (LV1/L96/LC8) B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (LV1/L96/LC8)
63	SPARE	F63UA	10A	Not Used
64	MAF/CNSTR VENT/HUMIDITY SENSOR	F64UA	15A	B75C Multifunction Intake Air Sensor Q12 Evaporative Emission Purge Solenoid Valve (LV1/L96/LC8)
65	ODD IGN/INJ	F65UA	20A	K20 Engine Control Module (LV1) Q17A Fuel Injector 1 (L96/LC8) Q17C Fuel Injector 3 (L96/LC8) Q17E Fuel Injector 5 (L96/LC8) Q17G Fuel Injector 7 (L96/LC8) T8A Ignition Coil 1 (LV1/L96/LC8) T8C Ignition Coil 3 (LV1/L96/LC8) T8E Ignition Coil 5 (LV1/L96/LC8) T8G Ignition Coil 7 (L96/LC8)
66	DRL2 (LOLVL-V22)	F66UA	10A	E13L Headlamp - Left (Without V22)
67	DRL1 (UPLVL+V22)	F67UA	15A	E4G Headlamp - Left Low Beam (V22)
68	AUX STOP LAMP(S)	F68UA	15A	X405 (Cutaway)
69	PWR EXT TRAILER	F69UA	10A	W8 Blunt Cut - Trailer Provision (UY7)
70	UPFTR STOP LAMP(S)	F70UA	10A	W25 Blunt Cut - Configurable Provision
71	FUEL HTR/FLEX FUEL SNSR	F71UA	15A	B198 Fuel Composition Sensor (L96)
72	BCM-6	F72UA	10A	K9 Body Control Module
73	LTR/DLC	F73UA	20A	E32 Cigarette Lighter Receptacle (DT4) X80A Accessory Power Receptacle - Center Console 1 (Without DT4) X84 Data Link Connector
75	ECM	F75UA	15A	K20 Engine Control Module (LWN)
76	SOOT SNSR	F76UA	10A	Not Used
77	O2 SNSR 1 (PRE)/CLS	F77UA	10A	B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (LV1/L96/LC8) B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (LV1/L96/LC8) K20 Engine Control Module (LWN)
78	ECM PWR/TRN	F78UA	10A	K20 Engine Control Module (L96/LC8)
79	EVEN IGN/INJ	F79UA	20A	K20 Engine Control Module (LV1) Q17B Fuel Injector 2 (L96/LC8) Q17D Fuel Injector 4 (L96/LC8) Q17F Fuel Injector 6 (L96/LC8) Q17H Fuel Injector 8 (L96/LC8) T8B Ignition Coil 2 (LV1/L96/LC8) T8D Ignition Coil 4 (LV1/L96/LC8) T8F Ignition Coil 6 (LV1/L96/LC8) T8H Ignition Coil 8 (L96/LC8)
J-Case Fuses
1	ABS MTR	F1UA	60A	K17 Electronic Brake Control Module
2	ABS MDL	F2UA	40A	K17 Electronic Brake Control Module
41	TCM BATT	F41UA	20A	K71 Transmission Control Module (M5U)
42	TRLR WRG	F42UA	30A	X88 Trailer Connector (UY7)
44	STRTR SOL	F44UA	40A	M64 Starter Motor
45	ECM PWR/TRN	F45UA	30A	K20 Engine Control Module (LV1/LWN)
46	SPARE	F46UA	30A	Not Used (Without KI4)
46	AC/DC INV	F46UA	25A	T1 Accessory DC/AC Power Inverter Module (KI4)
47	FAN LO	F47UA	40A	Not Used
74	FRT BLWR	F74UA	40A	R3 Blower Motor Resistor
Relays
15	RUN/CRNK	KR93 Ignition Run/Crank Relay	-	A10 Inside Rearview Mirror (UVC) B87 Rearview Camera (UVC) E11A Fuel Heater/Water in Fuel Sensor (LWN) K20 Engine Control Module K36 Inflatable Restraint Sensing and Diagnostic Module K38 Chassis Control Module (LV1/L96/LC8) K71 Transmission Control Module (M5U) P16 Instrument Cluster S40 Passenger Air Bag Disable Switch (C99) T12 Automatic Transmission Assembly (MYD)
37	NOX SENSOR	KR121B Reductant Control Module Relay 2	-	B136 Exhaust Particulate Matter Sensor (LWN) B195A Nitrogen Oxides Sensor 1 (LWN) B195B Nitrogen Oxides Sensor 2 (LWN)
38	FUEL PUMP	KR23A Fuel Pump Relay	-	A7 Fuel Pump and Level Sensor Assembly (LWN)
39	CRNK	KR27 Starter Relay	-	M64 Starter Motor
40	A/C CMPRSR	KR29 A/C Compressor Clutch Relay	-	Q2 A/C Compressor Clutch
48	EV FAN CLUTCH	KR20F Cooling Fan Relay	-	Q85 Cooling Fan Clutch (LWN)
49	PWR/TRN	KR75 Engine Controls Ignition Relay	-	B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (LV1/L96/LC8) B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (LV1/L96/LC8) B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (LV1/L96/LC8) B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (LV1/L96/LC8) B75C Multifunction Intake Air Sensor B198 Fuel Composition Sensor (L96) E45 Positive Crankcase Ventilation Heater (LWN) K20 Engine Control Module Q12 Evaporative Emission Purge Solenoid Valve (LV1/L96/LC8) Q17A Fuel Injector 1 (L96/LC8) Q17B Fuel Injector 2 (L96/LC8) Q17C Fuel Injector 3 (L96/LC8) Q17D Fuel Injector 4 (L96/LC8) Q17E Fuel Injector 5 (L96/LC8) Q17F Fuel Injector 6 (L96/LC8) Q17G Fuel Injector 7 (L96/LC8) Q17H Fuel Injector 8 (L96/LC8) Q44 Engine Oil Pressure Control Solenoid Valve (LV1) T8A Ignition Coil 1 (LV1/L96/LC8) T8B Ignition Coil 2 (LV1/L96/LC8) T8C Ignition Coil 3 (LV1/L96/LC8) T8D Ignition Coil 4 (LV1/L96/LC8) T8E Ignition Coil 5 (LV1/L96/LC8) T8F Ignition Coil 6 (LV1/L96/LC8) T8G Ignition Coil 7 (L96/LC8) T8H Ignition Coil 8 (L96/LC8)
50	SPARE	KR150 Relay - Spare	-	Not Used
57	FAN LO	KR20C Cooling Fan Low Speed Relay	-	Not Used
60	FAN CNTRL	KR20E Cooling Fan Speed Control Relay	-	Not Used
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block.
K3	WPR HI	KR12C Windshield Wiper Speed Control Relay	-	M75 Windshield Wiper Motor
K5	HORN/WASH	KR3 Horn Relay, KR11 Windshield Washer Pump Relay	-	P13 Horn Assembly G24 Windshield Washer Pump
K6	LO BEAM	KR49 Headlamp Low Beam Relay	-	E4G Headlamp - Left Low Beam (V22) E4H Headlamp - Right Low Beam (V22) E13L Headlamp - Left (Without V22) E13R Headlamp - Right (Without V22)
K7	HI BEAM	KR48 Headlamp High Beam Relay	-	E4E Headlamp - Left High Beam (V22) E4F Headlamp - Right High Beam (V22) E13L Headlamp - Left (Without V22) E13R Headlamp - Right (Without V22)
K9	TRLR LT STOP/TRN	KR63L Trailer Stop/Turn Signal Lamp Relay - Left	-	X88 Trailer Connector X405 (Cutaway)
K11	STOP LAMP(S)	KR59 Stop Lamp Relay	-	W8 Blunt Cut - Trailer Provision W25 Blunt Cut - Configurable Provision X405 (Cutaway)
K13	WPR	KR12B Windshield Wiper Relay	-	KR12C Windshield Wiper Speed Control Relay M75 Windshield Wiper Motor
K18	TRLR RT STOP/TRN	KR63R Trailer Stop/Turn Signal Lamp Relay - Right	-	X88 Trailer Connector X405 (Cutaway)
K19	DRL	KR42 Daytime Running Lamps Relay	-	F66UA (Without V22) F67UA (V22)