X50A Fuse Block - Underhood, Top View (LUV)

2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION X50A Fuse Block - Underhood, Top View (LUV)
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
GM3575031Courtesy of GENERAL MOTORS COMPANY
Usage Table

No. Device Label Name Device Assigned Name Rating Description
Mini Fuses 
01 ABS VALVE F1UA 30A
  • K17 Electronic Brake Control Module
02 SUNROOF F2UA 20A
  • K61 Sunroof Control Module (CF5)
03 NOT USED - -
  • Not Used
04 NOT USED - -
  • Not Used
05 OSRVM/POWER WINDOW SWITCH F5UA 7.5A
  • S52 Outside Rearview Mirror Switch (DG6)
06 AOS/ROS F6UA 5A
  • K85 Passenger Presence Module
07 PASSIVE ENTRY/PASSIVE START F7UA 7.5A
  • K84 Keyless Entry Control Module X1
  • K84 Keyless Entry Control Module X2
08 RVC F8UA 5A
  • K9 Body Control Module
09 REAR WIPER F9UA 20A
  • KR7 Rear Wiper Relay
  • M45 Rear Wiper Motor (Hatchback)
10 NOT USED/ IBS F10UA 5A
  • Not Used
11 RR WDW DEFOG F11UA 30A
  • E18 Rear Defogger Grid
12 ESCL F12UA 10A
  • K60 Steering Column Lock Module
13 NOT USED/ SAI VALVE F13UA 10A
  • Q29 Secondary Air Injection Solenoid Valve
14 OSRVM HTD F14UA 7.5A
  • A9A Outside Rearview Mirror - Driver (DG6)
  • A9B Outside Rearview Mirror - Passenger (DG6)
15 HEATED SEAT FRONT F15UA 25 A
  • K29 Seat Heating Control Module (KA1)
16 FSCM_1 F16UA 20A
  • K27 Fuel Pump Control Module
17 CANISTER VENT F17UA 10A
  • Q13 Evaporative Emission Vent Solenoid Valve
18 WASHER F18UA 10A
  • KR6 Rear Window Washer Pump Relay
  • KR11 Windshield Washer Pump Relay
19 NOT USED - -
  • Not Used
20 ECM_5 F20UA 10A
  • K20 Engine Control Module
21 FSCM_2/LEVELING F21UA 10A
  • K27 Fuel Pump Control Module
22 TCM_1/DC-DC CONVERTER F22UA 10A
  • B19C Brake Booster Vacuum Switch
  • B87 Rearview Camera
  • Q8 Control Solenoid Valve Assembly
23 NOT USED - -
  • Not Used
24 ECM_1 F24UA 10A
  • Q12 Evaporative Emission Purge Solenoid Valve
  • Q22 Intake Manifold Tuning Solenoid Valve
25 COIL/ECM F25UA 10A
  • K20 Engine Control Module
  • KR20C Cooling Fan Low Speed Relay
  • KR20D Cooling Fan High Speed Relay
  • KR25 Secondary Air Injection Pump Relay
  • KR26 Secondary Air Injection Solenoid Valve Relay
  • KR29 A/C Compressor Clutch Relay
  • KR31 Coolant Pump Relay - Auxiliary
26 ECM_4 F26UA 10A
  • B75C Multifunction Intake Air Sensor
  • E41 Engine Coolant Thermostat Heater
27 ECM_3 F27UA 10A
  • B52A Heated Oxygen Sensor 1
  • B52B Heated Oxygen Sensor 2
28 ECM_2 F28UA 20A
  • K20 Engine Control Module
29 INJECTOR/IGNITION COIL F29UA 15A
  • K35 Ignition Coil Module
  • Q17A Fuel Injector 1
  • Q17B Fuel Injector 2
  • Q17C Fuel Injector 3
  • Q17D Fuel Injector 4
30 ECM F30UA 15A
  • K20 Engine Control Module
31 AC CLUTCH F31UA 10A
  • KR29 A/C Compressor Clutch Relay
32 TCM F32UA 15A
  • Q8 Control Solenoid Valve Assembly (MH8 or MH9)
33 HORN F33UA 15A
  • P12 Horn
34 FRT FOG F34UA 10A
  • E29LF Fog Lamp - Left Front (T3U)
  • E29RF Fog Lamp - Right Front (T3U)
35 HIGH BEAM LH F35UA 10A
  • E4E Headlamp - Left High Beam
  • E13 Headlamp - Left
36 HIGH BEAM RH F36UA 10A
  • E4F Headlamp - Right High Beam
  • E13R Headlamp - Right
J-Case Fuses 
01 FRT WIPER F1UB 30A
  • KR12B Windshield Wiper Relay
02 ABS PUMP F2UB 40A
  • K17 Electronic Brake Control Module
03 BLOWER F3UB 40A
  • KR32E Blower Motor Relay
04 RUN/CRANK IEC F4UB 30A
  • F27DA
  • F28DA
  • F30DA
  • F34DA
05 POWER SEAT F5UB 30A
  • S64D Seat Adjuster Switch - Driver
06 COOL FAN K4 F6UB 30A
  • KR20C Cooling Fan Low Speed Relay
07 COOL FAN K5 F7UB 40A
  • KR20D Cooling Fan High Speed Relay
08 SAI PUMP F8UB 40A
  • KR25 Secondary Air Injection Pump Relay
09 EVP F9UB 20A
  • M9 Brake Booster Pump Motor (MH9)
10 START F10UB 25A
  • KR27 Starter Relay
Micro Relays 
01 FRT WIPER CONT KR12B Windshield Wiper Relay -
  • KR12C Windshield Wiper Speed Control Relay
  • M75 Windshield Wiper Motor
03 FRT WIPER SPEED KR12C Windshield Wiper Speed Control Relay -
  • M75 Windshield Wiper Motor
HC-Micro Relays 
12 START KR27 Starter Relay -
  • M64 Starter Motor
U-Micro Relays 
02 NOT USED/ REAR FOG LAMP KR57 Rear Fog Lamp Relay -
  • KR57 Rear Fog Lamp Relay
06 NOT USED/ SAI VALVE KR26 Secondary Air Injection Solenoid Valve Relay -
  • F13UA
13 AC CLUTCH KR29 A/C Compressor Clutch Relay -
  • Q2 A/C Compressor Clutch
14 HIGH BEAM KR48 Headlamp High Beam Relay -
  • F35UA
  • F36UA
MINI Relays 
04 RR DEFOG KR5 Rear Defogger Relay -
  • F10UA
  • F11UA
  • E18 Rear Defogger Grid
05 RUN/CRANK KR73 Ignition Main Relay -
  • F4UB
  • F19UA
  • F20UA
  • F21UA
  • F22UA
09 COOL FAN K2 KR20D Cooling Fan Medium Speed Relay -
  • G10 Cooling Fan Motor
10 COOL FAN K3 KR20D Cooling Fan High Speed Relay -
  • G10 Cooling Fan Motor
11 P/T KR75 Engine Controls Ignition Relay -
  • F24UA
  • F25UA
  • F26UA
  • F27UA
  • F28UA
  • F29UA
15 COOL FAN K1 KR20C Cooling Fan Low Speed Relay -
  • G10 Cooling Fan Motor
Note: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block. 
- - KR3 Horn Relay -
  • F33UA
- - 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
- - KR46 Front Fog Lamp Relay -
  • F34UA
- - KR97 Door Lock Relay -
  • A23P Door Latch Assembly - Passenger
  • A23LR Door Latch Assembly - Left Rear
  • A23RR Door Latch Assembly - Right Rear
Note: Items listed below are diagnostic test points for PCB relays 
TP01 - TP01 -
  • Not Used
TP02 - TP02 -
  • Not Used
TP03 - TP03 -
  • Not Used
TP04 - TP04 -
  • KR7 Rear Wiper Relay
TP05 - TP05 -
  • KR11 Windshield Washer Pump Relay
TP06 - TP06 -
  • KR6 Rear Window Washer Pump Relay
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.