X50A Fuse Block - Underhood Top View

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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
F1	-	F1UA	80A	K20 Engine Control Module (LFS) K34 Glow Plug Control Module (LBS or LBY)
F2	-	F2UA	-	Not Used
F3	-	F3UA	100A	E40 Electrical Auxiliary Heater (C32)
F4	-	F4UA	80A	G10 Cooling Fan Motor (LBS with MDK or LBY)
1	-	F01UA	20A	K20 Engine Control Module K34 Glow Plug Control Module (LBS or LBY)
2	-	F02UA	10A	B52A Heated Oxygen Sensor 1 (LUJ LVP or LWC) B52B Heated Oxygen Sensor 2 (LUJ) E41 Engine Coolant Thermostat Heater (LUJ LVP or LWC) E45 Positive Crankcase Ventilation Heater (LBS or LBY) M98 Intake Manifold Runner Valve Actuator (LFS) Q12 Evaporative Emission Purge Solenoid Valve (LUJ LVP or LWC) Q40 Turbocharger Bypass Solenoid Valve (LUJ LVP or LWC) Q41 Turbocharger Vane Position Control Solenoid Valve (LBS) Q42 Turbocharger Wastegate Solenoid Valve (LUJ LVP or LWC) Q42A Turbocharger 1 Wastegate Solenoid Valve (LBY) Q42B Turbocharger 2 Wastegate Solenoid Valve (LBY) Q44 Engine Oil Pressure Control Solenoid Valve (LBS with KL9 LVP LWC or LFS) Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve (LBS or LBY)
3	-	F03UA	15A	K20 Engine Control Module (LBS LVP LWC or LFS) K35 Ignition Coil Module (LUJ) Q17A Fuel Injector 1 (LUJ) Q17B Fuel Injector 2 (LUJ) Q17C Fuel Injector 3 (LUJ) Q17D Fuel Injector 4 (LUJ) T8A Ignition Coil 1 (LVP or LWC) T8B Ignition Coil 2 (LVP or LWC) T8C Ignition Coil 3 (LVP or LWC) T8D Ignition Coil 4 (LVP or LWC)
4	-	F04UA	15A	K20 Engine Control Module (LFS)
5	-	F05UA	-	Not Used
6	-	F06UA	7.5A	A9A Outside Rearview Mirror - Driver A9B Outside Rearview Mirror - Passenger
7	-	F07UA	5A	KR20C Cooling Fan Low Speed Relay (LUJ LVP or LWC) G10 Cooling Fan Motor (LBS with MDK or LBY)
8	-	F08UA	7.5A	B52 Heated Oxygen Sensor (LBS LBY or LFS) B52B Heated Oxygen Sensor 2 (LVP or LWC) B75B Mass Air Flow/Intake Air Temperature Sensor (LUJ without 5EA) B75C Multifunction Intake Air Sensor (LUJ with 5EA LVP or LWC)
9	-	F09UA	7.5A	K9 Body Control Module (UTU)
10	-	F10UA	5A	B110 Battery Sensor Module (KL9) K9 Body Control Module
11	-	F11UA	7.5A	KR95A Liftgate Unlatch Relay
12	-	F12UA	5A	K26 Headlamp Control Module (T4F or T95)
13	-	F13UA	25A	K17 Electronic Brake Control Module
14	-	F14UA	-	Not Used
15	-	F15UA	10A	K20 Engine Control Module (LBY LUJ LVP LWC or LFS)
16	-	F16UA	30A	KR27 Starter Relay
17	-	F17UA	10A	K71 Transmission Control Module (MDK) T12 Automatic Transmission Assembly (MH7)
18	-	F18UA	30A	E18 Rear Defogger Grid
19	-	F19UA	30A	M74D Window Motor - Driver M74P Window Motor - Passenger
20	-	F20UA	30A	M74LR Window Motor - Left Rear (AER) M74RR Window Motor - Right Rear (AER)
21	-	F21UA	40A	X53A Fuse Block - Rear Body
22	-	F22UA	10A	E13LA Headlamp Assembly - Left (T4A)
23	-	F23UA	25A	KR2 Headlamp Washer Fluid Pump Relay
24	-	F24UA	15A	E13RA Headlamp Assembly - Right (T4F)
25	-	F25UA	15A	E13LA Headlamp Assembly - Left (T4F)
26	-	F26UA	15A	E29LF Fog Lamp - Left Front (T3U) E29RF Fog Lamp - Right Front (T3U)
27	-	F27UA	30A	KR22 Fuel Heater Relay (LBS LBY or LFS)
28	-	F28UA	30A	T19 Power Supply Transformer (KL9)
29	-	F29UA	30A	K83 Parking Brake Control Module (J71)
30	-	F30UA	60A	K17 Electronic Brake Control Module
31	-	F31UA	-	Not Used
32	-	F32UA	5A	K36 Inflatable Restraint Sensing and Diagnostic Module
33	-	F33UA	15A	K26 Headlamp Control Module (T4F)
34	-	F34UA	-	Not Used
35	-	F35UA	7.5A	A10 Inside Rearview Mirror (TQ5) B177 Rain/Ambient Light Sensor Module (CE1 or TTW) K109 Frontview Camera Module (UFL) S52 Outside Rearview Mirror Switch S79D Window Switch - Driver
36	-	F36UA	10A	KR29 A/C Compressor Clutch Relay (C67 or CJ2)
37	-	F37UA	-	Not Used
38	-	F38UA	20A	KR14 Brake Booster Pump Motor Relay (LUJ LVP or LWC)
39	-	F39UA	20A	K38 Chassis Control Module (LVP or LWC)
40	-	F40UA	10A	KR6 Rear Window Washer Pump Relay KR11 Windshield Washer Pump Relay
41	-	F41UA	10A	E13RA Headlamp Assembly - Right (T4A)
42	-	F42UA	30A (LBS or LBY) 40A (LUJ LVP or LWC)	KR20C Cooling Fan Low Speed Relay (LBS or LBY) KR20P Cooling Fan Medium Speed Relay (LUJ LVP or LWC)
43	-	F43UA	30A	M75 Windshield Wiper Motor
44	-	F44UA	-	Not Used
45	-	F45UA	30A	G10 Cooling Fan Motor (LUJ LVP or LWC)
46	-	F46UA	-	Not Used
47	-	F47UA	15A	P12 Horn
48	-	F48UA	40A (LBS or LBY) 60A (LUJ LVP or LWC)	KR20C Cooling Fan Low Speed Relay (LUJ LVP or LWC) KR20D Cooling Fan High Speed Relay (LBS or LBY)
49	-	F49UA	20A	KR23A Fuel Pump Relay
50	-	F50UA	10A	E13LA Headlamp Assembly - Left (T4F) E13RA Headlamp Assembly - Right (T4F) S30 Headlamp Switch (T4A)
51	-	F51UA	5A	M96 Active Grille Air Shutter Actuator
52	-	F52UA	-	Not Used
53	-	F53UA	10A	K20 Engine Control Module K71 Transmission Control Module (MDK) T12 Automatic Transmission Assembly (MH7)
54	-	F54UA	7.5A	A10 Inside Rearview Mirror (CE1 or TTW) B108 Air Qaulity Sensor B116 Water in Fuel Sensor (LBS LBY or LFS) B75B Mass Air Flow/Intake Air Temperature Sensor (LBS or LBY) E40 Electrical Auxiliary Heater (C32) E41 Engine Coolant Thermostat Heater (LFS) K38 Chassis Control Module (LVP or LWC) K33 HVAC Control Module P16 Instrument Cluster Q56 Coolant Pump Clutch (LFS) T19 Power Supply Transformer (KL9)
Relays
1	-	-	-	Not Used
2	-	KR27 Starter Relay	-	M64 Starter Motor
3	-	KR75 Engine Controls Ignition Relay	-	F01UA F02UA F03UA F04UA F07UA F08UA KR20C Cooling Fan Low Speed Relay (LBS or LBY) KR20D Cooling Fan High Speed Relay (LBS or LBY) KR20P Cooling Fan Medium Speed Relay (LUJ LVP or LWC) KR22 Fuel Heater Relay (LBS or LBY) KR29 A/C Compressor Relay
4	-	KR5 Rear Defogger Relay	-	F06UA F09UA F18UA
5	-	KR2 Headlamp Washer Fluid Pump Relay	-	G16 Headlamp Washer Pump (CE4)
6	-	KR50 Headlamp Relay	-	F24UA (T4F) F25UA (T4F)
7	-	KR23A Fuel Pump Relay	-	G12 Fuel Pump
8	-	Spare	-	Not Used
9	-	KR22 Fuel Heater Relay	-	E11 Fuel Heater (LBS or LBY)
10	-	Spare	-	Not Used
11	-	KR20C Cooling Fan Low Speed Relay (LBS with MYJ)	-	G10 Cooling Fan Motor (LBS with MYJ)
11	-	KR20P Cooling Fan Medium Speed Relay (LUJ, LVP or LWC)	-	G10 Cooling Fan Motor (LUJ LVP or LWC)
12	-	KR20D Cooling Fan High Speed Relay (LUJ, LVP or LWC)	-	G10 Cooling Fan Motor (LUJ LVP or LWC)
12	-	KR20P Cooling Fan Medium Speed Relay (LBS with MYJ)	-	G10 Cooling Fan Motor (LBS with MYJ)
13	-	KR20C Cooling Fan Low Speed Relay (LUJ, LVP or LWC)	-	G10 Cooling Fan Motor (LUJ LVP or LWC) KR20D Cooling Fan High Speed Relay (LUJ LVP or LWC)
13	-	KR20D Cooling Fan High Speed Relay (LBS with MYJ)	-	G10 Cooling Fan Motor (LBS with MYJ)
14	-	KR73 Ignition Main Relay	-	F32UA F33UA F49UA F50UA F51UA F52UA F53UA F54UA
Note: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block.
15	-	KR29 A/C Compressor Clutch Relay	-	Q2 A/C Compressor Clutch
16	-	KR48 Headlamp High Beam Relay	-	F22UA F41UA
17	-	KR11 Windshield Washer Pump Relay	-	G24 Windshield Washer Pump
18	-	KR6 Rear Window Washer Pump Relay	-	G24 Windshield Washer Pump
19	-	-	-	Not Used
20	-	KR132 Fuel Door Lock Relay	-	M97 Fuel Door Lock Actuator
21	-	KR46 Front Fog Lamp Relay	-	F26UA
22	-	-	-	Not Used
23	-	KR3 Horn Relay	-	F47UA
24	-	-	-	Not Used
25	-	KR95A Liftgate Release Relay	-	M30 Liftgate Latch
Note: Items listed below are diagnostic testing points
TP01	-	-	-	KR132 Fuel Door Lock Relay
TP02	-	-	-	KR29 A/C Compressor Clutch Relay
TP03	-	-	-	KR7 Rear Wiper Relay
TP04	-	-	-	KR95A Liftgate Release Relay
TP05	-	-	-	KR95A Liftgate Release Relay
TP06	-	-	-	Not Used
TP07	-	-	-	KR132 Fuel Door Lock Relay
TP08	-	-	-	KR11 Windshield Washer Pump Relay
TP09	-	-	-	KR29 A/C Compressor Clutch Relay
TP10	-	-	-	KR6 Rear Window Washer Pump Relay
TP11	-	-	-	Not Used