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X50A Fuse Block - Underhood Top View

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Usage Table

No. Device Label Name Device Assigned Name Rating Description
Fuses 
F1 ABS PUMP F1UA 60A
  • K17 Electronic Brake Control Module
F2 EMPTY F2UA -
  • Not Used
F3 DRVR PWR SEAT F3UA 30A
  • K40D Seat Memory Control Module - Driver (A45)
  • S64D Seat Adjuster Switch - Driver (-A45)
F4 COOLING FAN F4UA 60A
  • K22 Cooling Fan Control Module (LGX-Y4Q)
F5 PASS PWR SEAT F5UA 30A
  • S64P Seat Adjuster Switch - Passenger
F6 NOT USED F6UA -
  • Not Used
F7 NOT USED F7UA -
  • Not Used
F8 NOT USED F8UA -
  • Not Used
F9 NOT USED F9UA -
  • Not Used
F10 NOT USED F10UA -
  • Not Used
F11 AUX DRL F11UA 15A
  • K167L Multifunction LED Control Module - Front Fascia Left (T4L)
  • K167R Multifunction LED Control Module - Front Fascia Right (T4L)
F12 WPR F12UA 30A
  • KR12B Windshield Wiper Relay
  • KR12C Windshield Wiper Speed Control Relay
F13 STRTR F13UA 30A
  • KR27 Starter Relay
F14 BRK VAC PUMP F14UA 30A
  • M9 Brake Booster Pump Motor (LT1/LT4)
F15 AHL F15UA 10A
  • K26 Headlamp Control Module (TR7)
F16 FRT HTD SEAT F16UA 15A
  • K29F Seat Heating Control Module - Front (KA1)
F17 PASS WNDW F17UA 10A
  • S79P Window Switch - Passenger
F18 BCM 4 F18UA 15A
  • K9 Body Control Module
F19 SDM AOS F19UA 10A
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  • K85 Passenger Presence Module
F20 ONSTAR/NAV (EXP) F20UA 10A
  • K73 Telematics Communication Interface Control Module (UE1)
F21 BCM 6 F21UA 10A
  • K9 Body Control Module
F22 ABS VLV F22UA 30A
  • K17 Electronic Brake Control Module
F23 NOT USED F23UA -
  • Not Used
F24 NOT USED F24UA -
  • Not Used
F25 ESCL F25UA 5A
  • K60 Steering Column Lock Module (N06)
F26 BCM 2 F26UA 10A
  • K9 Body Control Module
F27 NOT USED F27UA -
  • Not Used
F28 BCM 3 F28UA 15A
  • K9 Body Control Module
F29 BCM 8 F29UA 30A
  • K9 Body Control Module
F30 WSW F30UA 20A
  • KR11 Windshield Washer Pump Relay
F31 RT HID F31UA 20A
  • E4H Headlamp - Right Low Beam (T4F)
F32 LT HID F32UA 20A
  • E4G Headlamp - Left Low Beam (T4F)
F33 NOT USED F33UA -
  • Not Used
F34 HORN F34UA 15A
  • P12 Horn (-LT4)
  • P12L Horn - Left (LT4)
  • P12R Horn - Right (LT4)
F35 AHL F35UA 10A
  • M29L Headlamp Leveling Actuator - Left (TR7)
  • M29R Headlamp Leveling Actuator - Right (TR7)
F36 LT HI BEAM F36UA 10A
  • E4E Headlamp - Left High Beam (T4L)
  • M28L High Beam Solenoid Actuator - Left (T4F)
F37 RT HI BEAM F37UA 10A
  • E4F Headlamp - Right High Beam (T4L)
  • M28R High Beam Solenoid Actuator - Right (T4F)
F38 NOT USED F38UA -
  • Not Used
F39 NOT USED F39UA -
  • Not Used
F40 REC IGN F40UA 20A
  • F17RA
  • F18RA
  • F19RA
  • K29F Seat Heating Control Module - Front (KA1)
F41 MIL IGN F41UA 5A
  • P16 Instrument Cluster
F42 HVAC/ISRVM/OSRVM F42UA 10A
  • A10 Inside Rearview Mirror (DD8/DRZ)
  • K33 HVAC Control Module
F43 EXH VLV AFM F43UA 15A
  • Q15A Exhaust Flow Control Valve - Cylinder Deactivation Left (LGX+NPP/LT1)
  • Q15B Exhaust Flow Control Valve - Cylinder Deactivation Right (LGX+NPP/LT1)
F44 NOT USED F44UA -
  • Not Used
F45 S/ROOF F45UA 30A
  • M69 Sunroof Motor (CF5)
F46 BCM 7 F46UA 10A
  • K9 Body Control Module
F47 CGM F47UA 10A
  • K56 Serial Data Gateway Module
F48 A/C CLTCH F48UA 10A
  • KR29 A/C Compressor Clutch Relay
F49 HTD STR WHL F49UA 15A
  • F12RA
  • Q34 Skip Shift Solenoid Actuator (MH3/MJK/MM6)
F50 FSCM IGN F50UA 10A
  • K38 Chassis Control Module
  • K111 Fuel Pump Driver Control Module
F51 RR EXH VLV F51UA 15A
  • Q15R Exhaust Flow Control Valve - Right (NPP)
  • Q15L Exhaust Flow Control Valve - Left (NPP)
F52 NOT USED F52UA -
  • Not Used
F53 NOT USED F53UA -
  • Not Used
F54 ENG COOL PMP F54UA 15A
  • G36 Auxiliary Heater Coolant Pump (LT4)
F55 FUEL PRIME F55UA 5A
  • K20 Engine Control Module (LT1/LT4)
F56 NOT USED F56UA -
  • Not Used
F57 ECM IGN F57UA 15A
  • Not Used
F58 TCM IGN F58UA 15A
  • K71 Transmission Control Module (MI1/MI2/MI4/M5T)
F59 NOT USED F59UA -
  • Not Used
F60 TCM BATT F60UA 15A
  • K71 Transmission Control Module (MI1/MI2/MI4/M5T)
  • M47 Reverse Inhibit Solenoid Actuator (MH3/MJK/MM6)
F61 NON WALK VEH F61UA 10A
  • B52B Heated Oxygen Sensor 2 (LTG)
  • B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (-LTG)
  • B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (-LTG)
  • B75C Multifunction Intake Air Sensor
  • K20 Engine Control Module (LGX/LTG)
F62 COIL ODD F62UA 15A
  • K20 Engine Control Module
  • T8A Ignition Coil 1
  • T8B Ignition Coil 2 (LTG)
  • T8C Ignition Coil 3
  • T8D Ignition Coil 4 (LTG)
  • T8E Ignition Coil 5 (-LTG)
  • T8G Ignition Coil 7 (LT1/LT4)
F63 NON WALK O2 F63UA 15A
  • B52A Heated Oxygen Sensor 1 (LTG)
  • B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (-LTG)
  • B52E Heated Oxygen Sensor - Bank 1 Sensor 2 (-LTG)
  • Q12 Evaporative Emission Purge Solenoid Valve
  • Q36 Supercharger Bypass Solenoid Valve (LT4)
  • Q40 Turbocharger Bypass Solenoid Valve (LTG)
  • Q42 Turbocharger Wastegate Solenoid Valve (LTG)
  • Q43 Valve Lifter Oil Manifold Assembly (LT1)
  • Q44 Engine Oil Pressure Control Solenoid Valve
  • 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 COIL EVEN F64UA 15A
  • K20 Engine Control Module
  • T8B Ignition Coil 2 (-LTG)
  • T8D Ignition Coil 4 (-LTG)
  • T8F Ignition Coil 6
  • T8H Ignition Coil 8 (LT1/LT4)
F65 NOT USED F65UA -
  • Not Used
F66 ECM 1 F66UA 25A
  • K20 Engine Control Module
F67 ECM 2 F67UA 10A
  • K20 Engine Control Module (LGX)
F68 SPARE F68UA 5A
  • SPARE MICRO FUSE
F69 SPARE F69UA 7.5A
  • SPARE MICRO FUSE
F70 SPARE F70UA 10A
  • SPARE MICRO FUSE
F71 SPARE F71UA 15A
  • SPARE MICRO FUSE
F72 SPARE F72UB 20A
  • SPARE MICRO FUSE
F73 SPARE F73UB 25A
  • SPARE MICRO FUSE
F74 SPARE F74UB 30A
  • SPARE MICRO FUSE
F75 SPARE F75UB 2A
  • SPARE MINI FUSE
F76 SPARE F75UB 15A
  • SPARE MINI FUSE
F77 SPARE F75UB 30A
  • SPARE MINI FUSE
Relays 
K1 NOT USED - -
  • Not Used
K2 RUN CRNK RLY KR73 Ignition Main Relay -
  • F25UA
  • F38UA
  • F40UA
  • F41UA
  • F42UA
  • F43UA
  • F44UA
  • F49UA
  • F50UA
  • F51UA
  • F55UA
  • F56UA
  • F57UA
  • F58UA
K3 NOT USED - -
  • Not Used
K4 VAC PUMP RLY KR14 Brake Booster Pump Motor Relay -
  • F14UA
K5 A/C CNTRL RLY KR29 A/C Compressor Clutch Relay -
  • Q2 A/C Compressor Clutch
K6 COOLANT PUMP RLY KR18 Charge Air Cooler Coolant Pump Relay -
  • F54UA
K7 ECM RLY KR75 Engine Controls Ignition Relay -
  • F61UA
  • F62UA
  • F63UA
  • F64UA
  • F65UA
  • F66UA
  • F67UA
K8 FUEL PRIME RLY KR171 Engine Control Module Wake-Up Relay -
  • F55UA
K9 NOT USED - -
  • Not Used
K10 STRTR 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. 
K12 - Not Used -
  • Not Used
K13 - Not Used -
  • Not Used
K14 - KR42 Daytime Running Lamps Relay -
  • F11UA
K15 - KR11 Windshield Washer Pump Relay -
  • G24 Windshield Washer Pump
K16 - Not Used -
  • Not Used
K17 - Not Used -
  • Not Used
K18 - KR3 Horn Relay -
  • F34UA
K19 - Not Used -
  • Not Used
K20 - KR49 Headlamp Low Beam Relay -
  • F31UA
  • F32UA
K21 - KR12C Windshield Wiper Speed Control Relay -
  • M75 Windshield Wiper Motor
K22 - KR12B Windshield Wiper Relay -
  • KR12C Windshield Wiper Speed Control Relay
K23 - KR48 Headlamp High Beam Relay -
  • F36UA
  • F37UA
Important: Items listed below are diagnostic testing points. 
TP1 - TP1 -
  • Not Used
TP2 - TP2 -
  • Not Used
TP3 TEST POINT CKT 228 TP3 -
  • KR11 Windshield Washer Pump Relay
TP4 - TP4 -
  • Not Used
TP5 TEST POINT CKT 750 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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