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X50A Fuse Block - Underhood Top View

GM5123917Courtesy of GENERAL MOTORS COMPANY
Usage Table

No. Device Label Name Device Assigned Name Rating Description
Fuses 
F1 ABS F1UA Fuse 60A
  • K17 Electronic Brake Control Module (LCV/LGX)
  • K160 Brake System Control Module (LSY)
F2 STRTR 1 F2UA Fuse 25A
  • KR27 Starter Relay (LCV/LGX)
F3 DC DC TRANS 1 F3UA Fuse 40A
  • T19 Power Supply Transformer
F4 NOT USED F4UA Fuse -
  • Not Used
F5 DC DC TRANS 2 F5UA Fuse 40A
  • T19 Power Supply Transformer
F6 NOT USED F6UA Fuse -
  • Not Used
F7 BLWR FRT F7UA Fuse 40A
  • M8 Blower Motor
F8 STRTR 3 F8UA Fuse 40A
  • KR27C Starter Pinion Solenoid Actuator Relay
F9 NOT USED F9UA Fuse -
  • Not Used
F10 NOT USED F10UA Fuse -
  • Not Used
F11 NOT USED F11UA Fuse -
  • Not Used
F12 WPR FRT F12UA Fuse 30A
  • KR12B Windshield Wiper Relay
  • KR12C Windshield Wiper Speed Control Relay
F13 STRTR 2 F13UA Fuse 25A
  • KR27 Starter Relay (LSY)
F14 NOT USED F14UA Fuse -
  • Not Used
F15 REAR/WPR F15UA Fuse 20A
  • KR7 Rear Wiper Relay
F16 NOT USED F16UA Fuse -
  • Not Used
F17 NOT USED F17UA Fuse -
  • Not Used
F18 NOT USED F18UA Fuse -
  • Not Used
F19 NOT USED F19UA Fuse -
  • Not Used
F20 NOT USED F20UA Fuse -
  • Not Used
F21 NOT USED F21UA Fuse -
  • Not Used
F22 EBCM F22UA Fuse 30A
  • K17 Electronic Brake Control Module (LCV/LGX)
F23 PRK TRLR LAMP F23UA Fuse 15A
  • X88 Trailer Connector
F24 TRLR ST/TRN RT F24UA Fuse 10A
  • X88 Trailer Connector
F25 ESCL F25UA Fuse 5A
  • Not Used
F26 NOT USED F26UA Fuse -
  • Not Used
F27 TRLR ST/TRN LT F27UA Fuse 10A
  • X88 Trailer Connector
F28 NOT USED F28UA Fuse -
  • Not Used
F29 NOT USED F29UA Fuse -
  • Not Used
F30 WASH PUMP F30UA Fuse 20A
  • KR11 Windshield Washer Pump Relay
  • KR6 Rear Window Washer Pump Relay
F31 SPARE/LO BEAM RT F31UA Fuse 15A
  • Not Used
F32 LO BEAM LT F32UA Fuse 15A
  • T7L Headlight Ballast - Left (T4F)
  • E13L Headlamp - Left (T4L)
F33 H BEAM SH/FOG LMP FRT F33UA Fuse 15A
  • M28L High Beam Solenoid Actuator - Left (T4F)
  • M28R High Beam Solenoid Actuator - Right (T4F)
F34 HORN F34UA Fuse 20A
  • P13 Horn Assembly
F35 NOT USED F35UA Fuse -
  • Not Used
F36 LO BEAM RT/HI BEAM LT F36UA Fuse 15A
  • T7R Headlight Ballast - Right (T4F)
  • E13R Headlamp - Right (T4L)
F37 SPARE/HI BEAM RT F37UA Fuse 15A
  • Not Used
F38 HDLP MTR F38UA Fuse 15A
  • Not Used
F39 TCM BATT F39UA Fuse 20A
  • K71 Transmission Control Module
F40 LRBEC/DCDC IGN F40UA Fuse 20A
  • T19 Power Supply Transformer
  • X53A Fuse Block- Rear Body
F41 IPC F41UA Fuse 5A
  • P16 Instrument Cluster
F42 HVAC/CGM RUN/CRNK F42UA Fuse 10A
  • K33 HVAC Control Module
  • K56 Serial Data Gateway Module
F43 RLAD F43UA Fuse 5A
  • P43 Collision Alert Indicators (UEU)
F44 EBCM EBOOST RUN/CRANK F44UA Fuse 5A
  • K160 Brake System Control Module (LSY)
F45 NOT USED F45UA Fuse -
  • Not Used
F46 NOT USED F46UA Fuse -
  • Not Used
F47 NOT USED F47UA Fuse -
  • Not Used
F48 NOT USED F48UA Fuse -
  • Not Used
F49 ISRVM F49UA Fuse 15A
  • A10 Inside Rearview Mirror (DD8/DRZ)
F50 FSCM/FTZM RUN/CRNK F50UA Fuse 10A
  • K111 Fuel Pump Driver Control Module
F51 HTD WHL F51UA Fuse 15A
  • K32 Steering Wheel Heating Control Module (KI3)
F52 A/C CLTCH F52UA Fuse 10A
  • KR29 A/C Compressor Clutch Relay
F53 COOL/PMP F53UA Fuse 5A
  • G36 Auxiliary Heater Coolant Pump (LCV/LGX)
F54 NOT USED F54UA Fuse -
  • Not Used
F55 NOT USED F55UA Fuse -
  • Not Used
F56 NOT USED F56UA Fuse -
  • Not Used
F57 ECM IGN F57UA Fuse 15A
  • K20 Engine Control Module
F58 TCM IGN F58UA Fuse 20A
  • K71 Transmission Control Module
F59 ECM BATT F59UA Fuse 10A
  • K20 Engine Control Module
F60 NOT USED F60UA Fuse -
  • Not Used
F61 O2SNSR 1/SH/MAF F61UA Fuse 15A
  • B52B Heated Oxygen Sensor 2 (LCV/LSY)
  • B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (LGX)
  • B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (LGX)
  • B75C Multifunction Intake Air Sensor
  • K20 Engine Control Module
  • M96A Active Grille Air Shutter 1 Actuator
  • Q97B Engine Coolant Flow Control Valve - Block (LSY)
F62 ECM ODD F62UA Fuse 15A
  • K20 Engine Control Module (LCV/LGX)
  • T8A Ignition Coil 1
  • T8B Ignition Coil 2 (LCV/LSY)
  • T8C Ignition Coil 3
  • T8D Ignition Coil 4 (LCV/LSY)
  • T8E Ignition Coil 5 (LGX)
F63 O2 SNSR 2 F63UA Fuse 15A
  • B52A Heated Oxygen Sensor 1 (LCV/LSY)
  • B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (LGX)
  • B52E Heated Oxygen Sensor - Bank 1 Sensor 2 (LGX)
  • G58 Evaporative Emission Purge Pump (LSY)
  • M129A Intake Camshaft Profile Actuator 1 (LSY)
  • M129B Intake Camshaft Profile Actuator 2 (LSY)
  • M129C Intake Camshaft Profile Actuator 3 (LSY)
  • M129D Intake Camshaft Profile Actuator 4 (LSY)
  • M130B Exhaust Camshaft Profile Actuator 2 (LSY)
  • M130C Exhaust Camshaft Profile Actuator 3 (LSY)
  • Q12 Evaporative Emission Purge Solenoid Valve
  • Q40 Turbocharger Bypass Solenoid Valve (LSY)
  • Q44 Engine Oil Pressure Control Solenoid Valve (LCV/LGX)
  • Q83A Valve Lifter Oil Solenoid Valve - Bank 1 (LGX)
  • Q83B Valve Lifter Oil Solenoid Valve - Bank 2 (LGX)
  • Q84A Camshaft Position Actuator Park Lock Solenoid Valve - Bank 1 Intake (LGX)
  • Q84B Camshaft Position Actuator Park Lock Solenoid Valve - Bank 2 Intake (LGX)
F64 ECM EVEN F64UA Fuse 15A
  • K20 Engine Control Module (LGX)
  • T8B Ignition Coil 2 (LGX)
  • T8D Ignition Coil 4 (LGX)
  • T8E Ignition Coil 5 (LGX)
F65 ECM PWR/TRN 1 F65UA Fuse 15A
  • K20 Engine Control Module (LCV/LGX)
F66 ECM PWR/TRN 3 F66UA Fuse 25A
  • K20 Engine Control Module
F67 ECM PWR/TRN 3 F67UA Fuse 25A
  • K20 Engine Control Module (LSY)
F68 SPARE F68UA Fuse 5A
  • Not Used
F69 SPARE F69UA Fuse -
  • Not Used
F70 SPARE F70UA Fuse 10A
  • Not Used
F71 SPARE F71UA Fuse 15A
  • Not Used
F72 SPARE F72UA Fuse 20A
  • Not Used
F73 SPARE F73UA Fuse 25A
  • Not Used
F74 SPARE F74UA Fuse 30A
  • Not Used
F75 SPARE F75UA Fuse 2A
  • Not Used
F76 SPARE F76UA Fuse 15A
  • Not Used
F77 SPARE F77UA Fuse 30A
  • Not Used
Relays 
K1 STRTR 1 RLY KR27 Starter Relay -
  • M64 Starter Motor (LCV/LGX)
K2 RUN/CRNK RLY KR73 Ignition Main Relay -
  • F25UA
  • F38UA
  • F40UA
  • F41UA
  • F42UA
  • F43UA
  • F44UA
  • F49UA
  • F50UA
  • F51UA
  • F56UA
  • F57UA
  • F58UA
K3 STRTR 3 RLY KR27C Starter Pinion Solenoid Actuator Relay -
  • M64 Starter Motor
K4 NOT USED - -
  • Not Used
K5 NOT USED - -
  • Not Used
K6 NOT USED - -
  • Not Used
K7 ECM RLY KR75 Engine Controls Ignition Relay -
  • F61UA
  • F62UA
  • F63UA
  • F64UA
  • F65UA
  • F66UA
  • F67UA
  • KR29 A/C Compressor Clutch Relay
  • KR31 Coolant Pump Relay - Auxiliary
K8 A/C RLY KR29 A/C Compressor Clutch Relay -
  • Q2 A/C Compressor Clutch
K9 NOT USED - -
  • Not Used
K10 STRTR 2 RLY KR27 Starter Relay -
  • M64 Starter Motor (LSY)
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block 
K11 - KR7 Rear Wiper Relay -
  • M45 Rear Wiper Motor
K12 - KR125 Trailer Park Lamps Relay -
  • F23UA
K13 - KR63R Trailer Stop/Turn Signal Lamp Relay - Right -
  • F24UA
K15 - KR11 Windshield Washer Pump Relay -
  • G24 Windshield Washer Pump
K16 - KR6 Rear Window Washer Pump Relay -
  • G19 Rear Window Washer Pump
K17 - KR63L Trailer Stop/Turn Signal Lamp Relay - Left -
  • F27UA
K18 - KR3 Horn Relay -
  • F34UA
K19 - KR169 High Beam Solenoid Actuator Relay (T4F) -
  • F33UA
K20 - KR49L Headlamp Low Beam Relay - Left -
  • F31UA
  • F32UA
K21 - KR12C Windshield Wiper Speed Control Relay -
  • M75 Windshield Wiper Motor
K22 - KR12B Windshield Wiper Relay -
  • M75 Windshield Wiper Motor
K23 - KR49R Headlamp Low Beam Relay - Right -
  • F36UA
  • F37UA
Important: Items listed below are Wiper and Washer system diagnostic test points. 
TP1 TEST POINT CKT 1350 TP1 -
  • KR7 Rear Wiper Relay
TP2 TEST POINT CKT 393 TP2 -
  • KR7 Rear Wiper Relay
TP3 TEST POINT CKT 228 TP3 -
  • KR11 Windshield Washer Pump Relay
TP4 TEST POINT CKT 392 TP4 -
  • KR6 Rear Window Washer Pump Relay
TP5 TEST POINT CKT 850 TP5 -
  • KR12B Windshield Wiper Relay
TP6 TEST POINT CKT 92 TP6 -
  • KR12C Windshield Wiper Speed Control Relay
TP7 TEST POINT CKT 95 TP7 -
  • KR12C Windshield Wiper Speed Control Relay
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