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X50A Engine Wiring Harness Junction Block Top View

Electrical Component and Inline Harness Connector End Views | Component Locator | Document ID: 5872049 F53 F27 F54 F15 F21 F68 F55 F8 F1 F41 F34 F28 F56 F61 F73 F81 F2 F9 F16 F29 F42 F57 F62 F74 F82 F3 F10 F30 F75 F83 F69 F63 F58 K35 F17 F22 F4 F31 F11 F76 F84 K43 K5 K64 K70 K77 K23 K18 K36 F44 F45 F85 F6 F37 F46 F86 F19 F24 F65 F71 F32 F12 F7 F38 F47 F87 F48 F33 F39 F78 F88 K59 F49 F50 F40 F79 F89 F13 F80 F90 F51 F20 F25 F66 F72 F14 F91 F92 F67 F60 F52 F26 X5 Usage Table

No. Device Labe Name Device l Assigne Name d Rati ng Description
F1 NOT USED F1UA Not Used
F2 NOT USED F2UA Not Used
F3 NOT USED F3UA Not Used
F4 NOT USED F4UA Not Used
F6 ELM 7 F6UA 20 A K219 Lighting Control Module
F7 ELM 4 © 2023 Gen F7UA eral Motors 20 . All rights reserved. A
No. Device Label Name Device Assigned Name Rating K219 Lighting Control Module Description
F8 NOT USED F8UA Not Used
F9 ELM 5 F9UA 20A K219 Lighting Control Module
F10 ELM 6 F10UA 20A K219 Lighting Control Module
F11 LRR/FRT SRR F11UA 15A B233B Forward Range Radar Sensor - Long Range (UGN)
F12 NOT USED F12UA Not Used
F13 WSW FRT F13UA 15A KR11 Windshield Washer Pump Relay
F14 WSW RR F14UA 15A KR6 Rear Window Washer Pump Relay
F15 REC BATT 2 F15UA 60A X53A Body Wiring Harness Junction Block - Rear
F16 PSM F16UA 10A P25 Content Theft Deterrent Alarm
F17 EBCM BATT 1 F17UA 60A K160 Brake System Control Module X400
F19 DC/AC INV F19UA 60A T1 Accessory AC and DC Power Control Module (KI4/KI5)
F20 IECR2 F20UA 60A X51R Instrument Panel Wiring Harnes Junction Block - Right
F21 NOT USED F21UA Not Used
F22 IECL BATT 2 F22UA 60A X51AX Instrument Panel Wiring Harness Junction Block - Auxiliary (5W4/9C1)
F24 FUEL HTR F24UA 40A KR22 Fuel Heater Relay (LM2)
No. Device Label Name Device Assigned Name Rating Description
F25 REC BATT 1 F25UA 60A X53A Body Wiring Harness Junction Block - Rear
F26 CAMERA WASH F26UA 15A Not Used
F27 HORN F27UA 15A P13 Horn
F28 HDLP RT F28UA 20A E13RA Front Headlamp - Right
F29 HDLP LT F29UA 20A E13LA Front Headlamp - Left
F30 ELM 3 F30UA 20A K219 Lighting Control Module
F31 ELM 1 F31UA 20A K219 Lighting Control Module
F32 NOT USED F32UA Not Used
F33 NOT R/C F33UA 10A K60 Column Lock Module
F34 NOT USED F34UA Not Used
F37 MISC BODY IGN 1 F37UA 15A K38 Chassis Control Module (G96) K160 Brake System Control Module K212 Gear Shift Control Module P16 Instrument Panel Cluster Control Module P43 Forward Collision Alert Display (UEU-UV6) X400
F38 MISC BODY IGN 2 F38UA 10A K219 Lighting Control Module M73A Front Seat Back Ventilation Blower - Driver (KQV) M73B Front Seat Back Ventilation Blower - Passenger (KQV) M73D Front Seat Cushion Ventilation Blower - Driver (KQV) M73P Front Seat Cushion Ventilation Blower - Passenger (KQV) T1 Accessory AC and DC Power Control Module (KI4/KI5)
No. Device Label Name Device Assigned Name Rating Description
X401 (MBR)
F39 UPFITTER F39UA 10A W12FC Blunt Cut - Front Seat/Center Console (5W4/9C1) W12RCL Blunt Cut - Left Rear Cargo Trim (5W4/9C1)
F40 MISC IP IGN F40UA 10A A10 Inside Rearview Mirror (DD8/DRZ) E40 Air Heater (C3A) K36 Restraints Control Module X51AX Instrument Panel Wiring Harness Junction Block - Auxiliary (5W4/9C1)
F41 TRLR PRK LAMP F41UA 20A X88B Tow Vehicle Electrical Receptacle (Z82-U1D)
F42 T/LAMP RT F42UA 10A Not Used
F44 TIM/TRLR IGN F44UA 15A K68 Trailer Lamp Control Module (U1D- MBR) X88B Tow Vehicle Electrical Receptacle (U1D+MBR)
F45 SECD AXLE MTR F45UA 10A M26 Front Drive Axle Actuator (NP0/NQH)
F46 ECM IGN F46UA 15A K20 Engine Control Module
F47 TCM/TCCM/PTSQ IGN /DEFC F47UA 15A K69 Transfer Case Control Module (NP0/NQH) K71 Transmission Control Module K115 Reductant Control Module (LM2)
F48 NOT USED F48UA Not Used
F49 TRANS AUX OIL PUMP F49UA 15A G5 Automatic Transmission Auxiliary Fluid Pump (MQC)
F50 A/C CLTCH F50UA 10A Q2 Air Conditioning Clutch
F51 TCCM F51UA 30A K69 Transfer Case Control Module
No. Device Label Name Device Assigned Name Rating Description
(NP0/NQH)
F52 FRT WPR F52UA 30A KR12B Windshield Wiper Motor Relay KR12C Windshield Wiper Motor Speed Control Relay
F53 NOT USED F53UA 10A Not Used
F54 T/LAMP LT F54UA 10A Not Used
F55 TRLR REV LAMP F55UA 10A X88B Tow Vehicle Electrical Receptacle (Z82-U1D)
F56 SADS F56UA 15A K19 Suspension Control Module (Z95)
F57 NOT USED F57UA Not Used
F58 STRTR MTR F58UA 30A KR27 Starter Relay
F60 PWR/TRN SNSR 2 F60UA 10A B195A Nitrogen Oxides Sensor 1 (LM2) T19 Multifunction Power Supply Converter (LM2) K212 Gear Shift Control Module (LM2)
F61 ALC MAIN F61UA 15A K5 Vehicle Level Control Module (F47)
F62 DEFC BATT 2/CNST VENT SOL F62UA 10A K115 Reductant Control Module (LM2) Q13 Evaporative Emission Canister Vent Solenoid Valve (L84/L87)
F63 TRLR BRK F63UA 40A K67 Trailer Brake Control Module (JL1) W24 Blunt Cut - Trailer Brakes Provision -(Z82-JL1)
F65 NOT USED F65UA Not Used
F66 COOL FAN MTR LT F66UA 50A G10L Cooling Fan Motor - Left
F67 NOT USED F67UA Not Used
No. Device Label Name Device Assigned Name Rating Description
F68 ALC MTR F68UA 40A K5 Automatic Level Control Module (F47)
F69 STRTR PINION F69UA 40A KR27C Engine Restart Relay
F71 COOL FAN MTR LWR F71UA 50A G10LW Engine Cooling Fan Motor - Lower (LM2)
F72 COOL FAN MTR RT F72UA 50A G10R Engine Cooling Fan Motor - Right (L84/L87)
F73 TRLR STP/TRN LAMP LT F73UA 10A X88B Tow Vehicle Electrical Receptacle (Z82-U1D)
F74 TIM BATT 2 F74UA 30A K68 Trailer Lamp Control Module (U1D)
F75 DEFC BATT 1 F75UA 30A K115 Reductant Control Module (LM2)
F76 ELEC RNG BDS F76UA 30A K4 Running Board Control Module (B3L)
F78 ECM BATT F78UA 15A K20 Engine Control Module
F79 CABIN COOL PUMP 17W F79UA 10A G17 Heater Coolant Pump
F80 PWR/TRN SNSR 1 F80UA 20A B136 Exhaust Particulate Matter Sensor (LM2) B195B Nitrogen Oxides Sensor 2 (LM2) B195C Nitrogen Oxides Sensor 3 (LM2) K111 Fuel Pump Power Control Module (LM2) R29 Fuel Filter (LM2)
F81 TRLR STP/TRN LAMP RT F81UA 10A X88B Tow Vehicle Electrical Receptacle (Z82-U1D)
F82 TIM BATT 1 F82UA 30A K68 Trailer Lamp Control Module (U1D)
F83 FTZM F83UA 30A K111 Fuel Pump Driver Power Module
No. Device Label Name Device Assigned Name Rating Description
F84 TRLR BATT F84UA 30A X88B Tow Vehicle Electrical Receptacle (Z82)
F85 AUX WATER PUMP F85UA 15A M10 Charge Air Cooler Coolant Pump (LM2)
F86 PWR/TRN ECM 1 F86UA 30A K20 Engine Control Module
F87 EVEN INJ/ECM F87UA 20A K20 Engine Control Module (L84/L87) T8B Ignition Coil 2 (L84/L87) T8D Ignition Coil 4 (L84/L87) T8F Ignition Coil 6 (L84/L87) T8H Ignition Coil 8 (L84/L87)
F88 O2 B SNSR / MAF / ECM / WRAF / BCV F88UA 15A B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (L84/L87) B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (L84/L87) B75 Mass Airflow Sensor K20 Engine Control Module Q97B Engine Flow Control Valve - Block (LM2)
F89 O2 A SNSR / EPWR / CNSTR PRGE / WRAF F89UA 15A B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (L84/L87) B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (L84/L87) Q12 Evaporative Emission Canister Purge Solenoid Valve (L84/L87) Q44 Engine Oil Pressure Control Solenoid Valve (L84/L87)
F90 ODD INJ / ECM F90UA 20A K20 Engine Control Module T8A Ignition Coil 1 (L84/L87) T8C Ignition Coil 3 (L84/L87) T8E Ignition Coil 5 (L84/L87) T8G Ignition Coil 7 (L84/L87)
F91 PWR/TRN ECM 2 F91UA 15A K20 Engine Control Module (L84/L87)
F92 AERO SH F92UA 10A M96 Active Grille Air Shutter Actuator (VTI/WMI) M96B Active Grille Air Shutter 2
No. Device Label Name Device Assigned Name Rating Description
K5 NOT USED Not Used
K18 DC/AC INV KR202 Accessory AC and DC Power Control Module Relay F19UA
K23 FUEL HTR KR22 Fuel Heater Relay R29 Fuel Filter (LM2)
K35 TRLR PRK LAMP KR125 Trailer Parking Lamp Relay F41UA
K36 RUN/CRNK KR73 Ignition Main Relay F33UA F37UA F38UA F39UA F40UA F44UA F46UA F47UA F48UA
K43 SECD AXLE MTR KR203 Front Drive Axle Actuator Relay F45UA
K59 A/C CLTCH KR29 A/C Compressor Clutch Relay F50UA
K64 STRTR MTR KR27 Starter Relay M64 Starter Motor
K70 STRTR PINION KR27C Engine Restart Relay M64 Starter Motor
K77 PWR/TRN KR75 Engine Controls Ignition Relay F67UA F85UA F86UA F87UA F88UA F89UA F90UA F91UA
No. Device Label Name Device Assigned Name Rating Description
KR29 Air Conditioning Compressor Relay KR200 Engine Controls Sensor Supply Voltage Relay
Note: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block.
KR3 Horn Relay F27UA
KR6 Rear Window Washer Pump Relay G24 Windshield Washer Pump
KR11 Windshield Washer Pump Relay G24 Windshield Washer Pump
KR12B Windshield Wiper Motor Relay M75 Windshield Wiper Motor
KR12C Windshield Wiper Motor Speed Control Relay M75 Windshield Wiper Motor
KR61 Trailer Backup Lamp Relay F55UA
KR63L Trailer Stop/Turn Signal Lamp Relay - Left F73UA
KR63R Trailer Stop/Turn Signal Lamp Relay - Right F81UA
KR200 Engine Controls Sensor Supply Voltage Relay F60UA F80UA