X50A Fuse Block - Underhood Label

Fig 1: X50A Fuse Block - Underhood Fuse And Relay Label

Courtesy of GENERAL MOTORS COMPANY

X50A FUSE BLOCK - UNDERHOOD FUSE AND RELAY IDENTIFICATION LEGEND

No.	Device Label Name	Device Assigned Name	Rating	Description
Mini Fuses
1	-	F1UA	20A	K20 Engine Control Module
2	-	F2UA	10A	B52A Heated Oxygen Sensor 1 Q12 Evaporative Emission Purge Solenoid Valve Q40 Turbocharger Bypass Solenoid Valve (LHU) Q42 Turbocharger Wastegate Solenoid Valve (LHU)
3	-	F3UA	15 A	K20 Engine Control Module T8A Ignition Coil 1 T8B Ignition Coil 2 T8C Ignition Coil 3 T8D Ignition Coil 4
4	-	F4UA	15 A	Not Used
5	-	F5UA	-	Not Used
6a	-	F6aUA	-	Not Used
6b	-	F6bUA	7.5A	A9A Outside Rearview Mirror - Driver A9B Outside Rearview Mirror - Passenger
7	-	F7UA	5A	KR20C Cooling Fan Low Speed Relay G10 Cooling Fan Motor
8	-	F8UA	7.5A	B52B Heated Oxygen Sensor 2 B75C Multifunction Intake Air Sensor B198 Fuel Composition Sensor
9	-	F9UA	-	Not Used
10	-	F10UA	5A	K9 Body Control Module
11	-	F11UA	7.5A	Not Used
12	-	F12UA	-	Not Used
13	-	F13UA	25A	K17 Electronic Brake Control Module
14	-	F14UA	-	Not Used
15	-	F15UA	10A	K20 Engine Control Module
16	-	F16UA	30A	KR27 Starter Relay
17	-	F17UA	10A	Q8 Control Solenoid Valve Assembly
18	-	F18UA	30A	E18 Rear Defogger Grid
19	-	F19UA	30A	M74D Window Motor - Driver M74P Window Motor - Passenger (AEF) S79P Window Switch - Passenger (AED)
20	-	F20UA	30A	S79LR Window Switch - Left Rear S79RR Window Switch - Right Rear
21	-	F21UA	40A	X53A Fuse Block - Rear Body
22	-	F22UA	-	Not Used
23	-	F23UA	-	Not Used
24	-	F24UA	15A	E4F Headlamp - Right High Beam
25	-	F25UA	15A	E4E Headlamp - Left High Beam
26	-	F26UA	15A	E29LF Fog Lamp - Left Front (T3U) E29RF Fog Lamp - Right Front (T3U)
27	-	F27UA	50A	Not Used
28	-	F28UA	-	Not Used
29	-	F29UA	30A	K83 Parking Brake Control Module
30	-	F30UA	60A	K17 Electronic Brake Control Module
31	-	F31UA	-	Not Used
32	-	F32UA	5A	K36 Inflatable Restraint Sensing and Diagnostic Module
33	-	F33UA	-	Not Used
34	-	F34UA	7.5A	Not Used
35	-	F35UA	7.5A	S52 Outside Rearview Mirror Switch S79D Window Switch - Driver
36	-	F36UA	10A	KR29 A/C Compressor Clutch Relay
37	-	F37UA	10A	Q13 Evaporative Emission Vent Solenoid Valve
38	-	F38UA	20A	Not Used
39	-	F39UA	20A	K27 Fuel Pump Flow Control Module
40	-	F40UA	10A	KR11 Windshield Washer Pump Relay
41	-	F41UA	-	Not Used
42	-	F42UA	40A	KR20P Cooling Fan Medium Speed Relay
43	-	F43UA	30A	M75 Windshield Wiper Motor
44	-	F44UA	-	Not Used
45	-	F45UA	30A	G10 Cooling Fan Motor
46	-	F46UA	-	Not Used
47	-	F47UA	15A	P12 Horn
48	-	F48UA	60A	KR20C Cooling Fan Low Speed Relay
49	-	F49UA	20A	Not Used
50	-	F50UA	5A	B87 Rearview Camera (UVC)
51	-	F51UA	5A	A10 Inside Rearview Mirror (DD8)
52	-	F52UA	-	Not Used
53	-	F53UA	10A	K20 Engine Control Module Q8 Control Solenoid Valve Assembly
54	-	F54UA	7.5A	K27 Fuel Pump Control Module K33 HVAC Control Module P16 Instrument Cluster
J-Case Fuses
F01	-	F01UB	-	Not Used
F02	-	F02UB	80A	Not Used
F03	-	F03UB	-	Not Used
F04	-	F04UB	80A	G10 Cooling Fan Motor (LHU)
Relays
K01	-	-	-	Not Used
K02	-	KR27 Starter Relay	-	M64 Starter Motor
K03	-	KR75 Engine Controls Ignition Relay	-	KR29 A/C Compressor Clutch Relay F1UA F2UA F3UA F4UA F7UA F8UA
K04	-	KR5 Rear Defogger Relay	-	F6BUA F9UA F18UA
K05	-	-	-	Not Used
K06	-	KR50 Headlamp Relay	-	F24UA F25UA
K07	-	KR23A Fuel Pump Relay	-	Not Used
K08	-	-	-	Not Used
K09	-	-	-	Not Used
K10	-	-	-	Not Used
K11	-	KR20P Cooling Fan Medium Speed Relay	-	G10 Cooling Fan Motor
K12	-	KR20D Cooling Fan High Speed Relay	-	G10 Cooling Fan Motor (LEA)
K13	-	KR20C Cooling Fan Low Speed Relay	-	F45UA KR20D Cooling Fan High Speed Relay
K14	-	KR73 Ignition Main Relay	-	F5UA F32UA F49UA F50UA F51UA F52UA F53UA F54UA
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block
-	-	KR3 Horn Relay	-	F47UA
-	-	KR11 Windshield Washer Pump Relay	-	G24 Windshield Washer Pump
-	-	KR29 A/C Compressor Clutch Relay	-	Q2 A/C Compressor Clutch
-	-	KR46 Front Fog Lamp Relay	-	F26UA (T3U)
-	-	KR48 Headlamp High Beam Relay	-	F22UA F41UA