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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Electrical Center Identification Views) >> Electrical Center Identification Views >> X50A Engine Wiring Harness Junction Block Top View

X50A Engine Wiring Harness Junction Block Top View

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
GM5908945Courtesy of GENERAL MOTORS COMPANY
Usage Table

No. Device Label Name Device Assigned Name Rating Description
Fuses 
F01 LRR SNSR FRT F1UA 10A
  • B233B Forward Range Radar Sensor - Long Range (UGN)
  • B233LF Short Range Radar Sensor - Left Front (UGN)
  • B233RF Short Range Radar Sensor - Right Front (UGN)
F02 PRK/LGHT F2UA 10A
  • Not Used
F03 ELM4 F3UA 20A
  • K219 Lighting Control Module
F04 ELM7 F4UA 20A
  • K219 Lighting Control Module
F05 HDLP LVL F5UA 10A
  • Not Used
F06 NOT USED F6UA -
  • Not Used
F07 EBCM F7UA 60A
  • K160 Brake System Control Module
F08 WASH PMP F8UA 20A
  • KR11 Windshield Washer Pump Relay
F09 NOT USED F9UA -
  • Not Used
F10 NOT USED F10UA -
  • Not Used
F11 NOT USED F11UA -
  • Not Used
F12 HORN F12UA 15A
  • P12A Horn - High Note
  • P12B Horn - Low Note
F13 FRT WIPER F13UA 30A
  • KR12B Windshield Wiper Motor Relay
  • KR12C Windshield Wiper Motor Speed Control Relay
F14 ELM6 F14UA 20A
  • K219 Lighting Control Module
F15 ELM1 F15UA 20A
  • K219 Lighting Control Module
F16 ELM5 F16UA 20A
  • K219 Lighting Control Module
F17 ELM3 F17UA 20A
  • K219 Lighting Control Module
F18 AERO SH F18UA 10A
  • Not Used
F19 NOT USED F19UA -
  • Not Used
F20 NOT USED F20UA -
  • Not Used
F21 VKS/PSM F21UA 10A
  • Not Used
F22 ECM - BATTERY F22UA 10A
  • K20 Engine Control Module
F23 TCM F23UA 15A
  • K71 Transmission Control Module
  • M47 Manual Trnamission Reverse Grear Blockout Solenoid (MG9)
F24 AEM F24UA 10A
  • Q80L Engine Mount Actuator - Left
  • Q80R Engine Mount Actuator - Right
F25 NOT USED F25UA -
  • Not Used
F26 ECM F26UA 25A
  • K20 Engine Control Module
F27 INJ / IGN 2 F27UA 15A
  • K20 Engine Control Module
  • T8B Ignition Coil 2 (LF4)
  • T8D Ignition Coil 4 (LF4)
  • T8F Ignition Coil 6 (LF4)
F28 CAC F28UA 15A
  • M10 Charge Air Cooler Poolant Pump (LF4)
F29 TRANS COOL PMP F29UA 15A
  • G5 Transmission Fluid Pump - Electric/Auxiliary (MQA)
F30 INJ / IGN 1 F30UA 15A
  • K20 Engine Control Module
  • T8A Ignition Coil 1
  • T8B Ignition Coil 2 (LSY/L3B)
  • T8C Ignition Coil 3
  • T8D Ignition Coil 4 (LSY/L3B)
  • T8E Ignition Coil 5 (LF4)
F31 EMIS 1 F31UA 15A
  • B52A Heated Oxygen Sensor 1
  • M129A Intake Camshaft Profile Actuator 1
  • M129B Intake Camshaft Profile Actuator 2
  • M129C Intake Camshaft Profile Actuator 3
  • M129D Intake Camshaft Profile Actuator 4
  • M130B Exhaust Camshaft Profile Actuator 2 (L3B)
  • M130C Exhaust Camshaft Profile Actuator 3 (L3B)
  • Q12 Evaporative Emission Canister Purge Solenoid Valve
  • Q40 Turbocharger Bypass Solenoid ValveValve - Bank 1 Intake
  • B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (LF4)
  • Q40A Turbocharger Bypass Valve Solenoid - Bank 1 (LF4) Q40B Turbocharger Bypass Valve Solenoid - Bank 2 (LF4)
F32 EMIS 2 F32UA 10A
  • B52B Heated Oxygen Sensor 2
  • B75C Multifunction Intake Air Sensor (LSY)
  • B75D Mass Airflow Sensor - Bank 1 (LF4)
  • B75E Mass Airflow Sensor - Bank 2 (LF4)
  • B52D Heated Oxygen Sensor - Bank1 Sensor 2 (LF4)
  • B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (LF4)
  • B52F Heated Oxygen Sensor - Bank2 Sensor 2 (LF4)
  • B75 Mass Airflow Sensor
  • B280 Transmission Fluid Pressure Accumulator Solenoid Valve (M5N)
  • G58 Evaporative Emission Canister Purge Pump
  • K20 Engine Control Module (LSY/L3B)
  • Q97 Engine Coolant Flow Control Valve (LSY/L3B)
F33 STRTR SOL 2 F33UA 30A
  • KR27 Starter Relay
F34 NOT USED F34UA -
  • Not Used
F35 NOT USED F35UA 10A
  • Not Used
F36 STRTR PINION F36UA 40A
  • KR27C Engine Restart Relay
F37 AC CLTCH F37UA 10A
  • G1 Air Conditioning Compressor
  • Q2 Air Conditioning Clutch
F38 NOT USED F38UA -
  • Not Used
F39 NOT USED F39UA -
  • Not Used
F40 NOT USED F40UA -
  • Not Used
F41 NOT USED F41UA -
  • Not Used
F42 WATER PMP F42UA 15A
  • Not Used
F43 NOT USED F43UA -
  • Not Used
F44 NOT USED F44UA -
  • Not Used
Relays 
K47 NOT USED - -
  • Not Used
K48 FRT WPR SPD KR12C Windshield Wiper Motor Speed Control Relay -
  • M75 Windshield Wiper Motor
K49 FRT WPR CNTRL KR12B Windshield Wiper Motor Relay -
  • KR12C Windshield Wiper Motor Speed Control Relay
K51 NOT USED - -
  • Not Used
K52 ECM KR75 Engine Controls Ignition Relay -
  • F18UA Fuse
  • F26UA Fuse
  • F27UA Fuse
  • F30UA Fuse
  • F31UA Fuse
  • F32UA Fuse
  • KR29 Air Conditioning Compressor Relay
K53 STRTR SOL KR27 Starter Relay -
  • M64 Starter
K54 STRTR PINION KR27C Engine Restart Relay -
  • M64 Starter
K55 NOT USED - -
  • Not Used
K57 AC CLTCH KR29 Air Conditioning Compressor Relay -
  • Q2 Air Conditioning Clutch
K58 NOT USED - -
  • M64 Starter
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block. 
- - KR3 Horn Relay -
  • F12UA Fuse
- - KR11 Windshield Washer Pump Relay -
  • G24 Windshield Washer Pump
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