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X50A Fuse Block - Underhood, Top View (Chevrolet)

GM4663491Courtesy of GENERAL MOTORS COMPANY
Usage Table

No. Device Label Name Device Assigned Name Rating Description
Mini Fuses 
1 SUNROOF F1UA 25A
  • K61 Sunroof Control Module
2 PWR_WINDOW_DRV, OSRVM_SW F2UA 7.5A
  • S52 Outside Rearview Mirror Switch
  • S79D Window Switch - Driver
3 CANISTER_VENT_SOLENOID F3UA 5A
  • Q13 Evaporative Emission Vent Solenoid Valve
4 Not Used F4UA -
  • Not Used
5 EBCM_VALVE F5UA 30A
  • K17 Electronic Brake Control Module
6 Not Used F6UA -
  • Not Used
7 ESCL F7UA 10A
  • K60 Steering Column Lock Module (N06)
8 TCM B+ F8UA 15A
  • K71 Transmission Control Module (MM1)
9 AOS F9UA 5A
  • K85 Passenger Presence Module (AL0)
10 REAR_VIEW_CAM, ISRVM F10UA 10A
  • B87 Rearview Camera
  • A10 Inside Rearview Mirror
11 RR_WIPER_X1_1, RR_WIPER_X1_2 F11UA 20A
  • KR7 Rear Wiper Relay
  • M45 Rear Wiper Motor
12 RR WDW DEFOG F12UA 25A
  • E18 Rear Defogger Grid
13 PWR_LUMBAR_SW F13UA 10A
  • S65D Seat Lumbar Support Switch - Driver (AG9)
14 OSRVM_HEAT_DR, OSRVM_HEAT_CO_DR F14UA 7.5A
  • A9A Outside Rearview Mirror - Driver
  • A9B Outside Rearview Mirror - Passenger
15 FSCM B+ F15UA 20A
  • K38 Chassis Control Module
16 HEATED_SEAT_MODULE F16UA 25A
  • K29 Seat Heating Control Module (KA1)
17 FSCM, TIM F17UA 10A
  • K18 Compass Module
  • K38 Chassis Control Module
18 ECM_RC, TCM_RC F18UA 5A
  • K20 Engine Control Module
  • K71 Transmission Control Module
19 FUEL PUMP F19UA 20A
  • KR23A Fuel Pump Relay
  • A7 Fuel Pump and Level Sensor Assembly
20 Not Used F20UA -
  • Not Used
21 FAN3_RELAY, FWD_AUX F21UA 15A
  • KR20E Cooling Fan Speed Control Relay
  • KR20F Cooling Fan Relay
  • KR29 A/C Compressor Clutch Relay
22 Not Used F22UA -
  • Not Used
23 IGNITION_COIL, INJECTOR_COIL F23UA 15A
  • K35 Ignition Coil Module
  • Q17A Fuel Injector 1
  • Q17B Fuel Injector 2
  • Q17C Fuel Injector 3
  • Q17D Fuel Injector 4
24 WASHER_PUMP_X1_1, WASHER_PUMP_X1_2 F24UA 10A
  • KR6 Rear Window Washer Pump Relay
  • KR11 Windshield Washer Pump Relay
  • G24 Windshield Washer Pump
25 Not Used F25UA 10A
  • Spare
26 CANISTER_PURGE_SOL, VARIABLE_VALVE_SOL, VARIABLE_SWIRL_SOL, TURBO_WASTEGATE_SOL, TURBO_BYPASS_SOL, O2_SENSOR_PRE_POST, IMTV_SOL F26UA 10A
  • B52A Heated Oxygen Sensor 1
  • B52B Heated Oxygen Sensor 2
  • E41 Engine Coolant Thermostat Heater
  • Q12 Evaporative Emission Purge Solenoid Valve
  • Q40 Turbocharger Bypass Solenoid Valve
  • Q42 Turbocharger Wastegate
27 Not Used F27UA -
  • Not Used
28 Not Used F28UA -
  • Not Used
29 ECM_PT_IGN1, ECM_PT_IGN2 F29UA 20A
  • K20 Engine Control Module
30 MAF_SENSOR F30UA 10A
  • B75C Multifunction Intake Air Sensor
31 HIGH_BEAM_LH F31UA 15A
  • E4E Headlamp - Left High Beam
32 HIGH_BEAM_RH F32UA 15A
  • E4F Headlamp - Right High Beam
33 ECM B+ F33UA 15A
  • K20 Engine Control Module
34 HORN_SINGLE F34UA 15A
  • P12B Horn - Low Note
35 AC_CLUTCH F35UA 10A
  • G1 A/C Compressor
  • KR29 A/C Compressor Clutch Relay
  • Q2 A/C Compressor Clutch
36 FRONT_FOG_LAMP F36UA 15A
  • E29LF Fog Lamp - Left Front (T3U)
  • E29RF Fog Lamp - Right Front (T3U)
J-Case Fuses 
1 EBCM_PUMP F1UB 40A
  • K17 Electronic Brake Control Module
2 FRT_WIPER_X1_4, FRT_WIPER_X1_5 F2UB 30A
  • KR12B Windshield Wiper Relay
  • KR12C Windshield Wiper Speed Control Relay
  • M75 Windshield Wiper Motor
3 BLOWER_MOTOR F3UB 40A
  • KR32E Blower Motor Relay
  • M8 Blower Motor
4 IEC_RC F4UB 30A
  • X51A Fuse Block - Instrument Panel
5 Not Used F5UB -
  • Not Used
6 Not Used F6UB -
  • Not Used
7 Not Used F7UB -
  • Not Used
8 SINGLE_2_SPEED_LOW (2H0), SINGLE_3_SPEED_LOW (LUV), SINGLE_3_SPEED_MID (LUV) F8UB 40A
  • KR20C Cooling Fan Low Speed Relay
  • KR20P Cooling Fan Medium Speed Relay
9 SINGLE_2_SPEED_HIGH (2H0), SINGLE_3_SPEED_HIGH (LUV) F9UB 60A
  • KR20D Cooling Fan High Speed Relay
10 EVP F10UB 30A
  • KR14 Brake Booster Pump Motor Relay
  • M9 Brake Booster Pump Motor
11 STARTER_SOL F11UB 30A
  • KR27 Starter Relay
U - Micro Relays 
2 FUEL_PUMP_SPST KR23A Fuel Pump Relay -
  • A7 Fuel Pump and Level Sensor Assembly
4 Not Used KR150 Relay - Spare -
  • Not Used
HC-Micro Relays 
6 SINGLE_2_SPEED_HIGH (2H0), SINGLE_3_SPEED_HIGH (LUV) KR20D Cooling Fan High Speed Relay -
  • KR20D Cooling Fan High Speed Relay
MINI Relays 
1 RUN_CRANK_SPDT KR73 Ignition Main Relay -
  • F4UB
  • F7UA
  • F10UA
  • F17UA
  • F18UA
  • F19UA
3 SINGLE_3_SPEED_MID (LUV) KR20P Cooling Fan Medium Speed Relay -
  • R10 Cooling Fan Resistor
  • G10 Cooling Fan Motor
5 PT_RELAY_SPDT KR75 Engine Controls Ignition Relay -
  • F21UA
  • F23UA
  • F26UA
  • F28UA
  • F29UA
  • F30UA
6 SINGLE_2_SPEED_HIGH (2H0), SINGLE_3_SPEED_HIGH (LUV) KR20D Cooling Fan Medium Speed Relay -
  • R10 Cooling Fan Resistor
  • G10 Cooling Fan Motor
8 SINGLE_2_SPEED_LOW (2H0), SINGLE_3_SPEED_LOW (LUV) KR20C Cooling Fan Low Speed Relay -
  • R10 Cooling Fan Resistor
  • G10 Cooling Fan Motor
Note: Relays listed below are Printed Circuit Board (PCB) relays and are only serviceable by Printed Circuit Board (PCB) Assembly (if available) or Fuse Block Assembly. PCB Relays are not serviceable individually. 
- - KR3 Horn Relay -
  • P12B Horn - Low Note
- - KR5 Rear Defogger Relay -
  • A9A Outside Rearview Mirror - Driver
  • A9B Outside Rearview Mirror - Passenger
  • E18 Rear Defogger Grid
- - KR6 Rear Window Washer Pump Relay -
  • G24 Windshield Washer Pump
- - KR7 Rear Wiper Relay -
  • M45 Rear Wiper Motor
- - KR11 Windshield Washer Pump Relay -
  • G24 Windshield Washer Pump
- - KR12B Windshield Wiper Relay -
  • KR12C Windshield Wiper Speed Control Relay
  • M75 Windshield Wiper Motor
- - KR12C Windshield Wiper Speed Control Relay -
  • M75 Windshield Wiper Motor
- - KR29 A/C Compressor Clutch Relay -
  • G1 A/C Compressor
  • Q2 A/C Compressor Clutch
- - KR33 Auxiliary Heater Coolant Pump Relay -
  • Not Used
- - KR42L Daytime Running Lamp Relay-Left -
  • E4G Headlamp - Left Low Beam
- - KR42R Daytime Running Lamp Relay-Right -
  • E4H Headlamp - Right Low Beam
- - KR46 Front Fog Lamp Relay -
  • E29LF Fog Lamp - Left Front (T3U)
  • E29RF Fog Lamp - Right Front (T3U)
- - KR48 Headlamp High Beam Relay -
  • E4E Headlamp - Left High Beam
  • E4F Headlamp - Right High Beam
- - KR110 Cold Start Fuel Pump Relay -
  • Not Used
Note: Items listed below are diagnostic test points for PCB relays 
TP4 - TP4 -
  • Not Used
Note: Items listed below are Door Lock/Indicator diagnostic test points for PCB relays 
TP1 - TP1 -
  • KR113 Child Security Lock Disable Relay
TP5 - TP5 -
  • KR113 Child Security Lock Disable Relay
Note: Items listed below are Wiper/Washer diagnostic test points for PCB relays 
TP3 - TP3 -
  • M75 Windshield Wiper Motor
TP8 - TP8 -
  • G24 Windshield Washer Pump
TP9 - TP9 -
  • M45 Rear Wiper Motor
TP10 - TP10 -
  • G24 Windshield Washer Pump
Note: Items listed below are A/C Clutch diagnostic test points for PCB relays 
TP6 - TP6 -
  • KR29 A/C Compressor Clutch Relay
Note: Items listed below are Door Lock/Indicator diagnostic test points for PCB relays 
TP2 - TP2 -
  • KR42L Daytime Running Lamp Relay-Left
TP7 - TP7 -
  • KR42R Daytime Running Lamp Relay-Right
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