X50A Engine Wiring Harness Junction Block Top View

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of GENERAL MOTORS COMPANY

Usage Table

No.	Device Label Name	Device Assigned Name	Rating	Description
Fuses
F01	SRR SNR FRT	F1UA	10A	B233B Forward Range Radar Sensor - Long Range (UGN) B233LF Short Range Radar Sensor - Left Front (UKL) B233RF Short Range Radar Sensor - Right Front (UKL)
F02	PRK/DRL	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	E13LA Front Headlamp - Left (TR7)
F06	NOT USED	F6UA	-	Not Used
F07	EBCM	F7UA	60A	A104 Brake Master Cylinder 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
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	M96 Active Grille Air Shutter Actuator (VTI)
F19	NOT USED	F19UA	-	Not Used
F20	NOT USED	F20UA	-	Not Used
F21	VKS/PSM	F21UA	10A	P25 Content Theft Deterrent Alarm (UTR)
F22	ECM - BATTERY	F22UA	10A	K20 Engine Control Module
F23	TCM	F23UA	15A	K71 Transmission Control Module (-MJK)
F24	AEM	F24UA	10A	Q80L Engine Mount Actuator - Left (LSY) Q80R Engine Mount Actuator - Right (LSY)
F25	NOT USED	F25UA	-	Not Used
F26	ECM	F26UA	25A	K20 Engine Control Module
F27	INJ / IGN 2	F27UA	15A	K20 Engine Control Module (LGY/LT4) T8B Ignition Coil 2 (LGY/LT4) T8D Ignition Coil 4 (LGY/LT4) T8F Ignition Coil 6 (LGY/LT4) T8H Ignition Coil 8 (LT4)
F28	CAC	F28UA	15A	M10 Charge Air Cooler Coolant Pump (LGY/LT4)
F29	TRANS COOL PMP/TRANS REVERSE LOCK OUT	F29UA	15A	G5 Automatic Transmission Auxiliary Fluid Pump (-MJK) T12 Automatic Transmission (-MJK) M47 Manual Transmission Reverse Gear Blockout Solenoid (MJK)
F30	INJ / IGN 1	F30UA	15A	K20 Engine Control Module T8A Ignition Coil 1 T8B Ignition Coil 2 (LSY) T8C Ignition Coil 3 T8D Ignition Coil 4 (LSY) T8E Ignition Coil 5 (LGY/LT4) T8G Ignition Coil 7 (LT4)
F31	EMIS 1	F31UA	15A	B52A Heated Oxygen Sensor 1 (LSY) B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (LGY/LT4) B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (LGY) G58 Evaporative Emission Canister 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 Canister Purge Solenoid Valve Q40 Turbocharger Bypass Valve Solenoid (LSY) Q40A Turbocharger Bypass Valve Solenoid - Bank 1 (LGY) Q40B Turbocharger Bypass Valve Solenoid - Bank 2 (LGY) Q43 Valve Lifter Oil Manifold (LT4) Q44 Engine Oil Pressure Control Solenoid Valve (LT4) Q84A Camshaft Position Actuator Locating Pin Control Valve - Bank 1 Intake (LGY) Q84B Camshaft Position Actuator Locating Pin Control Valve - Bank 2 Intake (LGY) Q94AA Valve Rocker Arm Oil Control Valve - Bank 1 (LGY) Q94BB Valve Rocker Arm Oil Control Valve - Bank 2 (LGY)
F32	EMIS 2	F32UA	10A	B52B Heated Oxygen Sensor 2 (LSY) B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (LGY/LT4) B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (LT4) B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (LGY/LT4) B75 Mass Airflow Sensor (LSY/LT4) B75D Mass Airflow Sensor - Bank 1 (LGY) B75E Mass Airflow Sensor - Bank 2 (LGY) K20 Engine Control Module M10 Charge Air Cooler Coolant Pump (LGY/LT4) Q97 Engine Coolant Flow Control Valve (LSY)
F33	STRTR SOL	F33UA	30A	KR27 Starter Relay
F34	NOT USED	F34UA	-	Not Used
F35	NOT USED	F35UA	-	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	G8 Engine Coolant Pump - Auxiliary (LGY)
F43	NOT USED	F43UA	-	Not Used
F44	NOT USED	F44UA	-	Not Used
Relays
K47	NOT USED	-	-	Not Used
K48	FRT WPR SPD	-	-	Not Used
K49	FRT WPR CNTRL	KR12B Windshield Wiper Motor Relay	-	M75 Windshield Wiper Motor
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	-	F37UA Fuse
K58	NOT USED	-	-	Not Used
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