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X50A Fuse Block - Underhood Top View

GM5128961Courtesy of GENERAL MOTORS COMPANY
Usage Table

No. Device Label Name Device Assigned Name Rating Description
Fuses 
F1 ABS F1UA 60A
  • K17 Electronic Brake Control Module
F2 STRTR 1 F2UA 40A
  • KR27C Starter Pinion Solenoid Actuator Relay
F3 DC DC TRANS 1 F3UA 40A
  • T19 Power Supply Transformer
F4 EMPTY F4UA -
  • Not Used
F5 DC DC TRANS 2 F5UA 40A
  • T19 Power Supply Transformer
F6 EMPTY F6UA -
  • Not Used
F7 EMPTY F7UA -
  • Not Used
F8 EMPTY F8UA -
  • Not Used
F9 VAC PMP F9UA 30A
  • KR14 Brake Booster Pump Motor Relay
F10 WPR FRT F10UA 30A
  • KR12B Windshield Wiper Relay
  • KR12C Windshield Wiper Speed Control Relay
F11 EMPTY F11UA -
  • Not Used
F12 EMPTY F12UA -
  • Not Used
F13 STRTR 2 F13UA 25A
  • Not Used
F14 EMPTY F14UA -
  • Not Used
F15 REAR/WPR F15UA 20A
  • KR7 Rear Wiper Relay
  • M45 Rear Wiper Motor
F16 EMPTY F16UA -
  • Not Used
F17 EMPTY F17UA -
  • Not Used
F18 EMPTY F18UA -
  • Not Used
F19 EMPTY F19UA -
  • Not Used
F20 EMPTY F20UA -
  • Not Used
F21 EMPTY F21UA -
  • Not Used
F22 EBCM F22UA 30A
  • K17 Electronic Brake Control Module
F23 PRK TRLR LAMP F23UA 15A
  • X88 Trailer Connector
F24 TRLR ST/TRN RT F24UA 10A
  • X88 Trailer Connector
F25 ESCL F25UA 5A
  • K60 Steering Column Lock Module (N06)
F26 EMPTY F26UA -
  • Not Used
F27 TRLR ST/TRN LT F27UA 10A
  • X88 Trailer Connector
F28 EMPTY F28UA -
  • Not Used
F29 EMPTY F29UA -
  • Not Used
F30 WASH PMP F30UA 20A
  • KR11 Windshield Washer Pump Relay
  • KR6 Rear Window Washer Pump Relay
F31 EMPTY F31UA -
  • Not Used
F32 LO BEAM LT F32UA 20A
  • Not Used
F33 FOG LP FRT F33UA 15A
  • E29LF Fog Lamp - Left Front (T3U)
  • E29RF Fog Lamp - Right Front (T3U)
F34 HORN F34UA 20A
  • P12L Horn - Left
  • P12R Horn - Right
F35 EMPTY F35UA -
  • Not Used
F36 EMPTY F36UA -
  • Not Used
F37 LO BEAM RT F37UA 20A
  • Not Used
F38 HDLP MTR F38UA 15A
  • Not Used
F39 TCM BATT F39UA 20A
  • K71 Transmission Control Module
F40 LRBEC IGN F40UA 20A
  • F17RA Fuse
  • F18RA Fuse
  • F19RA Fuse
  • T19 Power Supply Transformer
  • X53A Fuse Block - Rear Body
F41 IPC F41UA 5A
  • P16 Instrument Cluster
F42 HVAC F42UA 10A
  • A34 HVAC Controls - Auxiliary
  • K33 HVAC Control Module
  • E40 Electrical Auxiliary Heater (C32)
F43 HUD F43UA 5A
  • P43 Collision Alert Indicators (UEU)
F44 CGM RUN/CRNK F44UA 5A
  • Not Used
F45 EMPTY F45UA -
  • Not Used
F46 EMPTY F46UA -
  • Not Used
F47 EMPTY F47UA -
  • Not Used
F48 EMPTY F48UA -
  • Not Used
F49 ISRVM F49UA 15A
  • A10 Inside Rearview Mirror (DD8/DRZ)
F50 FSCM F50UA 10A
  • K111 Fuel Pump Driver Control Module
F51 HTD WHL F51UA 15A
  • K32 Steering Wheel Heating Control Module (UVD)
  • X85 Steering Wheel Air Bag Coil (UVD)
F52 FOLD SEATS SW F52UA 10A
  • S144B Folding Seat Control Switch - Rear Compartment 3rd Row (AS8)
F53 EMPTY F53UA -
  • Not Used
F54 ENG/COOL/PMP F54UA 15A
  • G36 Auxiliary Heater Coolant Pump
F55 A/C CLTCH F55UA 10A
  • G1 A/C Compressor
F56 ICCM F56UA 10A
  • Not Used
F57 ECM IGN F57UA 15A
  • K20 Engine Control Module
F58 TCM IGN F58UA 10A
  • K71 Transmission Control Module
F59 ECM BATT F59UA 10A
  • K20 Engine Control Module
F60 ECM EVEN 1 F60UA 20A
  • K20 Engine Control Module (LFY)
  • T8B Ignition Coil 2
  • T8D Ignition Coil 4
  • T8F Ignition Coil 6 (LFY)
F61 O2SNSR1/MAF/SH F61UA 15A
  • B52B Heated Oxygen Sensor 2 (LTG)
  • B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (LFY)
  • B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (LFY)
  • B75C Multifunction Intake Air Sensor
  • K20 Engine Control Module
F62 EMPTY F62UA -
  • Not Used
F63 O2SNSR2/CNSTR F63UA 15A
  • B52A Heated Oxygen Sensor 1 (LTG)
  • B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (LFY)
  • B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (LFY)
  • Q12 Evaporative Emission Purge Solenoid Valve
  • Q40 Turbocharger Bypass Solenoid Valve (LTG)
  • Q42 Turbocharger Wastegate Solenoid Valve (LTG)
  • Q44 Engine Oil Pressure Control Solenoid Valve (LTG)
F64 SHUTTER F64UA 15A
  • M96A Active Grille Air Shutter 1 Actuator (WMI)
  • M96B Active Grille Air Shutter 2 Actuator (VTI or WMI)
F65 ECM PWR/TRN 1 F65UA 15A
  • K20 Engine Control Module
F66 ECM PWR/TRN 2 F66UA 25A
  • K20 Engine Control Module
F67 COIL ODD F67UA 20A
  • K20 Engine Control Module
  • T8A Ignition Coil 1
  • T8C Ignition Coil 3
  • T8E Ignition Coil 5 (LFY)
F68 SPARE F68UA -
  • Not Used
F69 SPARE F69UA -
  • Not Used
F70 SPARE F70UA -
  • Not Used
F71 SPARE F71UA -
  • Not Used
F72 SPARE F72UA -
  • Not Used
F73 SPARE F73UA -
  • Not Used
F74 SPARE F74UA -
  • Not Used
F75 SPARE F75UA -
  • Not Used
F76 SPARE F76UA -
  • Not Used
F77 SPARE F77UA -
  • Not Used
Relays 
K1 STRTR 1 RLY KR27C Starter Pinion Solenoid Actuator Relay -
  • M64 Starter Motor
K2 RUN/CRNK RLY KR73 Ignition Main Relay -
  • F25UA Fuse
  • F38UA Fuse
  • F40UA Fuse
  • F41UA Fuse
  • F42UA Fuse
  • F43UA Fuse
  • F44UA Fuse
  • F49UA Fuse
  • F50UA Fuse
  • F51UA Fuse
  • F57UA Fuse
  • F58UA Fuse
K3 VAC PMP RLY KR14 Brake Booster Pump Motor Relay -
  • M9 Brake Booster Pump Motor
K4 EMPTY - -
  • Not Used
K5 A/C RLY KR29 A/C Compressor Clutch Relay -
  • F55UA Fuse
K6 COOL/PMP RLY KR31 Coolant Pump Relay - Auxiliary -
  • F54UA Fuse
K7 ECM RLY KR75 Engine Controls Ignition Relay -
  • F61UA Fuse
  • F62UA Fuse
  • F63UA Fuse
  • F64UA Fuse
  • F65UA Fuse
  • F66UA Fuse
  • F67UA Fuse
  • KR29 A/C Compressor Clutch Relay
  • KR31 Coolant Pump Relay - Auxiliary
K8 PARK SW RLY KR87 Transmission Park Position Relay -
  • F52UA Fuse
K9 EMPTY - -
  • Not Used
K10 STRTR 2 RLY KR27 Starter Relay -
  • M64 Starter Motor
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block. 
- - KR3 Horn Relay -
  • F34UA Fuse
- - KR6 Rear Window Washer Pump Relay -
  • G19 Rear Window 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
- - KR12C Windshield Wiper Speed Control Relay -
  • M75 Windshield Wiper Motor
- - KR46 Front Fog Lamp Relay -
  • F33UA Fuse
- - KR49L Headlamp Low Beam Relay - Left -
  • F32UA Fuse
- - KR49R Headlamp Low Beam Relay - Right -
  • F37UA Fuse
- - KR63L Trailer Stop/Turn Signal Lamp Relay - Left -
  • F27UA Fuse
- - KR63R Trailer Stop/Turn Signal Lamp Relay - Right -
  • F24UA Fuse
- - KR125 Trailer Park Lamps Relay -
  • F23UA Fuse
Important: Items listed below are Wipers and Washers system diagnostic testing 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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