X50A Fuse Block - Underhood, Top View (Buick)

Courtesy of GENERAL MOTORS COMPANY

Usage Table

No.	Device Label Name	Device Assigned Name	Rating	Description
Mini Fuses
1	SUNROOF	F1UA	25A	K61 Sunroof Control Module
2	RAIN SENSOR, OSRVM SW, DRIVER WINDOW SW, UGDO	F2UA	7.5A	B177 Rain/Ambient Light Sensor Module (-UFL) B224 Multifunction Windshield Sensor (UFL) S52 Outside Rearview Mirror Switch S25 Universal Garage Door Opener S79D Window Switch - Driver S79D Window Switch - Driver
3	CANISTER_VENT_SOLENOID	F3UA	5A	Q13 Evaporative Emission Vent Solenoid Valve
4	Not Used	F4UA	-	Not Used
5	EBCM_VALVE	F5UA	30A	K17 Electronic Brake Control Module
6	IBS	F6UA	5A	B110 Battery Sensor Module
7	ESCL	F7UA	10A	K60 Steering Column Lock Module (N06)
8	TCM B+	F8UA	15A	K71 Transmission Control Module (MM1)
9	AOS	F9UA	5A	K85 Passenger Presence Module (AL0)
10	REAR_VIEW_CAM, ISRVM	F10UA	10A	B87 Rearview Camera A10 Inside Rearview Mirror
11	REAR WIPER	F11UA	20A	KR7 Rear Wiper Relay M45 Rear Wiper Motor
12	RR WDW DEFOG	F12UA	25A	E18 Rear Defogger Grid
13	PWR_LUMBAR_SW	F13UA	10A	S65D Seat Lumbar Support Switch - Driver (AG9)
14	OSRVM_HEAT_DR, OSRVM_HEAT_CO_DR	F14UA	7.5A	A9A Outside Rearview Mirror - Driver A9B Outside Rearview Mirror - Passenger
15	FSCM B+	F15UA	20A	K38 Chassis Control Module
16	HEATED_SEAT_MODULE	F16UA	25A	K29 Seat Heating Control Module (-AAG) K40 Seat Memory Control Module (AAG)
17	DC_DC_TRANS, FSCM, TIM	F17UA	10A	K38 Chassis Control Module T19 Power Supply Transformer
18	FICM, TCM_RC, PCM_RC	F18UA	5A	B218L Side Object Sensor Module - Left (UFT) B218R Side Object Sensor Module - Right (UFT) K20 Engine Control Module K71 Transmission Control Module
19	FUEL PUMP	F19UA	20A	A7 Fuel Pump and Level Sensor Assembly
20	Not Used	F20UA	-	Not Used
21	FAN3_RELAY_85, FWD_AUX	F21UA	15A	KR20C Cooling Fan Low Speed Relay KR20E Cooling Fan Speed Control Relay KR20F Cooling Fan Relay KR20P Cooling Fan Medium Speed Relay KR29 A/C Compressor Clutch Relay
22	Not Used	F22UA	-	Not Used
23	IGNITION_COIL, INJECTOR_COIL	F23UA	20A	Q17A Fuel Injector 1 Q17B Fuel Injector 2 Q17C Fuel Injector 3 Q17D Fuel Injector 4 T8A Ignition Coil 1 T8B Ignition Coil 2 T8C Ignition Coil 3 T8D Ignition Coil 4
24	WASHER_PUMP_X1_1, WASHER_PUMP_X1_2	F24UA	10A	KR6 Rear Window Washer Pump Relay KR11 Windshield Washer Pump Relay G24 Windshield Washer Pump
25	Not Used	F25UA	-	Not Used
26	WATER_VALVE_SOL, CANISTER_PURGE_SOL, VARIABLE_SWIRL_SOL, TURBO_BYPASS_SOL, TURBO_WASTEGATE_SOL, IMTV_SOL	F26UA	10A	B52A Heated Oxygen Sensor 1 E41 Engine Coolant Thermostat Heater Q12 Evaporative Emission Purge Solenoid Valve Q40 Turbocharger Bypass Solenoid Valve Q42 Turbocharger Wastegate Q44 Engine Oil Pressure Control Solenoid Valve Q56 Coolant Pump Clutch
27	AUX_HEATER_PUMP	F27UA	15A	G36 Auxiliary Heater Coolant Pump
28	ECM PT IGN-3	F28UA	10A	K20 Engine Control Module
29	ECM_PT_IGN1, ECM_PT_IGN2	F29UA	25A	K20 Engine Control Module
30	O2_SENSOR, MAF_SENSOR	F30UA	10A	B52B Heated Oxygen Sensor 2 B75C Multifunction Intake Air Sensor B280 Automatic Transmission Accumulator Solenoid Valve
31	HIGH_BEAM_LH	F31UA	15A	E4E Headlamp - Left High Beam
32	HIGH_BEAM_RH	F32UA	15A	E4F Headlamp - Right High Beam
33	ECM B+	F33UA	15A	K20 Engine Control Module
34	HORN	F34UA	15A	P12A Horn - High Note P12B Horn - Low Note
35	AC_CLUTCH	F35UA	10A	KR29 A/C Compressor Clutch Relay G1 A/C Compressor
36	FRONT_FOG_LAMP	F36UA	15A	E29LF Fog Lamp - Left Front E29RF Fog Lamp - Right Front
J-Case Fuses
1	EBCM_PUMP	F1UB	40A	K17 Electronic Brake Control Module
2	FRT_WIPER_X1_4, FRT_WIPER_X1_5	F2UB	30A	KR12B Windshield Wiper Relay KR12C Windshield Wiper Speed Control Relay M75 Windshield Wiper Motor
3	LPM	F3UB	40A	K8 Blower Motor Control Module
4	IEC_RC	F4UB	30A	X51A Fuse Block - Instrument Panel
5	Not Used	F5UB	-	Not Used
6	Not Used	F6UB	-	Not Used
7	STARTER	F7UB	30A	KR27 Starter Relay
8	COOL_FAN_LOW_MID	F8UB	40A	KR20C Cooling Fan Low Speed Relay KR20P Cooling Fan Medium Speed Relay
9	COOL_FAN_HIGH	F9UB	60A	KR20D Cooling Fan High Speed Relay
10	Not Used	F10UB	-	Not Used
11	STARTER_SOL	F11UB	40A	KR27C Starter Pinion Solenoid Actuator Relay
U - Micro Relays
2	FUEL_PUMP_SPST	KR23A Fuel Pump Relay	-	A7 Fuel Pump and Level Sensor Assembly
4	AUX_HEATER_PUMP	KR33 Auxiliary Heater Coolant Pump Relay	-	G36 Auxiliary Heater Coolant Pump
HC-Micro Relays
7	STARTER PINION	KR27C Starter Pinion Solenoid Actuator Relay (KL9)	-	M64 Starter Motor
10	STARTER SOL	-	-	Not Used
MINI Relays
1	RUN_CRANK	KR73 Ignition Main Relay	-	F4UB F7UA F10UA F17UA F18UA F19UA
3	COOL_FAN_MID	KR20P Cooling Fan Medium Speed Relay	-	R10 Cooling Fan Resistor G10 Cooling Fan Motor
5	PT_RELAY	KR75 Engine Controls Ignition Relay	-	F21UA F23UA F26UA F28UA F29UA F30UA
8	COOL_FAN_LOW	KR20C Cooling Fan Low Speed Relay	-	R10 Cooling Fan Resistor G10 Cooling Fan Motor
HC-Mini Relays
6	COOL FAN HIGH	KR20D Cooling Fan Medium Speed Relay	-	R10 Cooling Fan Resistor G10 Cooling Fan Motor
Note: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block.
-	-	KR3 Horn Relay	-	P12A Horn - High Note P12B Horn - Low Note
-	-	KR5 Rear Defogger Relay	-	A9A Outside Rearview Mirror - Driver A9B Outside Rearview Mirror - Passenger E18 Rear Defogger Grid
-	-	KR6 Rear Window Washer Pump Relay	-	G24 Windshield Washer Pump
-	-	KR7 Rear Wiper Relay	-	M45 Rear Wiper Motor
-	-	KR11 Windshield Washer Pump Relay	-	G24 Windshield Washer Pump
-	-	KR12B Windshield Wiper Relay	-	KR12C Windshield Wiper Speed Control Relay M75 Windshield Wiper Motor
-	-	KR12C Windshield Wiper Speed Control Relay	-	M75 Windshield Wiper Motor
-	-	KR29 A/C Compressor Clutch Relay	-	G1 A/C Compressor Q2 A/C Compressor Clutch
-	-	KR33 Auxiliary Heater Coolant Pump Relay	-	Not Used
-	-	KR42L Daytime Running Lamp Relay-Left	-	E4G Headlamp - Left Low Beam
-	-	KR42R Daytime Running Lamp Relay-Right	-	E4H Headlamp - Right Low Beam
-	-	KR46 Front Fog Lamp Relay	-	E29LF Fog Lamp - Left Front (T3U) E29RF Fog Lamp - Right Front (T3U)
-	-	KR48 Headlamp High Beam Relay	-	E4E Headlamp - Left High Beam E4F Headlamp - Right High Beam
-	-	KR110 Cold Start Fuel Pump Relay	-	Not Used
Note: Items listed below are diagnostic test points for PCB relays
TP4	-	TP4	-	Not Used
Note: Items listed below are Door Lock/Indicator diagnostic test points for PCB relays
TP1	-	TP1	-	KR113 Child Security Lock Disable Relay
TP5	-	TP5	-	KR113 Child Security Lock Disable Relay
Note: Items listed below are Wiper/Washer diagnostic test points for PCB relays
TP3	-	TP3	-	M75 Windshield Wiper Motor
TP8	-	TP8	-	G24 Windshield Washer Pump
TP9	-	TP9	-	M45 Rear Wiper Motor
TP10	-	TP10	-	G24 Windshield Washer Pump
Note: Items listed below are A/C Clutch diagnostic test points for PCB relays
TP6	-	TP6	-	KR29 A/C Compressor Clutch Relay
Note: Items listed below are Door Lock/Indicator diagnostic test points for PCB relays
TP2	-	TP2	-	KR42L Daytime Running Lamp Relay-Left
TP7	-	TP7	-	KR42R Daytime Running Lamp Relay-Right