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X50A Fuse Block - Underhood Label

Fig 1: X50A Fuse Block - Underhood Label
GM3960489Courtesy of GENERAL MOTORS COMPANY
X50A FUSE BLOCK - UNDERHOOD FUSE AND RELAY IDENTIFICATION LEGEND

No. Device Label Name Device Assigned Name Rating Description
Fuses 
1 STARTER 1 Fuse F1UA Fuse 30A KR27 Starter Relay
2 STARTER 2 Fuse F2UA Fuse 40 A KR27C Starter Pinion Solenoid Actuator Relay
3 NON/WALK Fuse F3UA Fuse 15 A B52A Heated Oxygen Sensor 1, K20 Engine Control Module, KR27 Starter Relay, Q12 Evaporative Emission Purge Solenoid Valve, Q40 Turbocharger Bypass Solenoid Valve (LTG), Q42 Turbocharger Wastegate Solenoid Valve (LTG), and Q44 Engine Oil Pressure Control Solenoid Valve
4 ECM Fuse F4UA Fuse 25 A K20 Engine Control Module
5 FLEX/FUEL Fuse F5UA Fuse 10 A M96 Active Grille Air Shutter Actuator, and KR31 Coolant Pump Relay - Auxiliary
6 EMPTY/TCM Fuse F6UA Fuse 20 A Not Used
7 EMPTY F7UA Fuse 10A Not Used
8 ECM Fuse F8UA Fuse 10 A K20 Engine Control Module
9 AC Fuse F9UA Fuse 10 A KR29 A/C Compressor Clutch Relay
10 CNSTR/VENT/SOL F10UA Fuse - Q13 Evaporative Emission Vent Solenoid Valve
11 FUEL/PUMP Fuse F11UA Fuse 20 A K111 Fuel Pump Driver Control Module
12 HTD/SEAT Fuse F12UA Fuse 15 A K29 Seat Heating Control Module
13 ENG/COOL/PUMP Fuse F13UA Fuse 7.5 A KR31 Coolant Pump Relay - Auxiliary
14 EMPTY F14UA Fuse - Not Used
15 02 SNSR Fuse F15UA Fuse 10 A B52B Heated Oxygen Sensor 2, B75C Multifunction Intake Air Sensor, and B280 Automatic Transmission Accumulator Solenoid Valve
16 IGN/COIL/ODD Fuse F16UA Fuse 15 A K20 Engine Control Module, T8A Ignition Coil 1, T8B Ignition Coil 2, T8C Ignition Coil 3, and T8D Ignition Coil 4
17 IGN/COIL/EVEN Fuse F17UA Fuse 15 A K20 Engine Control Module
18 EMPTY F18UA Fuse 5 A Not Used
19 EMPTY F19UA Fuse 10 A Not Used
20 DC/DC TRANS Fuse F20UA Fuse 40 A T19 Power Supply Transformer
21 L/GATE Fuse F21UA 30 A K39 Liftgate Control Module
22 ABS Fuse F22UA Fuse 60 A K17 Electronic Brake Control Module
23 WASH/PUMP Fuse F23UA Fuse 15 A KR11 Windshield Washer Pump Relay, and KR6 Rear Window Washer Pump Relay
24 HDLP/WASH Fuse F24UA Fuse 25 A KR2 Headlamp Washer Pump Relay
25 EMPTY F25UA Fuse - Not Used
26 TRANS/OIL/PUMP F26UA Fuse 40 A KR108 Transmission Hydraulics Oil Pump Relay
27 ABS Fuse F27UA Fuse 30 A K17 Electronic Brake Control Module
28 EMPTY F28UA Fuse 30A Not Used
29 RR/WDO/DEFOG Fuse F29UA Fuse 40 A E18 Rear Defogger Grid
30 MIR/DEFOG Fuse F30UA Fuse 7.5 A A9A Outside Rearview Mirror Glass - Driver, and A9B Outside Rearview Mirror Glass - Passenger
31 EMPTY F31UA Fuse - Not Used
32 VAR/FUNC Fuse F32UA Fuse 7.5 A K33 HVAC Control Module, K111 Fuel Pump Driver Control Module, KR80 Accessory Relay (KI6), P16 Instrument Cluster, P43 Collision Alert Indicators, T1 Accessory DC/AC Power Inverter Module (KI6), and T19 Power Supply Transformer
33 EMPTY F33UA Fuse - Not Used
34 HORN Fuse F34UA Fuse 15 A P12A Horn - High Note, and P12B Horn - Low Note
35 EMPTY F35UA Fuse - Not Used
36 HI/BEAM/RT Fuse F36UA Fuse 10 A M28R High Beam Solenoid Actuator - Right
37 HI/BEAM/LT Fuse F37UA Fuse 10 A M28L High Beam Solenoid Actuator - Left
38 AHL Fuse F38UA Fuse 5 A K28 Headlamp Leveling Control Module (T4F)
39 FOG/LMP/FRT Fuse F39UA Fuse 15 A E29LF Fog Lamp - Left Front, and E29RF Fog Lamp - Right Front
40 TRANS/OIL/PUMP Fuse F40UA Fuse 5 A Not Used
41 CD/ST/VNT/ESTAT_TCM Fuse F41UA Fuse 10 A M73B Seat Blower Motor - Passenger Back (KU3), and M73D Seat Blower Motor - Passenger Cushion (KU3)
42 HDLP/POS Fuse F42UA Fuse 10 A M3L Headlamp Horizontal Motor - Left (T4F), M3R Headlamp Horizontal Motor - Right (T4F), M29L Headlamp Leveling Actuator - Left (T4F), and M29R Headlamp Leveling Actuator - Right (T4F)
43 EMPTY F43UA Fuse 20 A Not Used
44 ISRVM Fuse F44UA Fuse 10 A A10 Inside Rearview Mirror, and B87 Rearview Camera (Without UVH)
45 EMPTY F45UA Fuse 15 A Not Used
46 DR/SEAT/VENT Fuse F46UA Fuse 10 A M73A Seat Blower Motor - Driver Back (KU1), and M73C Seat Blower Motor - Driver Cushion (KU1)
47 ECSCL Fuse F47UA Fuse 20 A Not Used
48 RR/WPR Fuse F48UA Fuse 20 A M45 Rear Wiper Motor, and KR7 Rear Wiper Relay
49 EMPTY F49UA Fuse - Not Used
50 EMPTY F50UA Fuse - Not Used
51 DRL LH Fuse F51UA Fuse 15 A T7R Headlamp Ballast - Right (T4F)
52 ECM/TCM Fuse F52UA Fuse 7.5 A K20 Engine Control Module, and Q8 Control Solenoid Valve Assembly
53 EMPTY F53UA Fuse - Not Used
54 EMPTY F54UA Fuse - Not Used
55 FRT/WPR Fuse F55UA Fuse 30 A KR12B Windshield Wiper Relay, and KR12C Windshield Wiper Speed Control Relay
56 EMPTY F56UA Fuse - Not Used
57 DRL/LT F57UA Fuse 15 A T7L Headlamp Ballast - Left (T4F)
Relays 
K1 START/STOP Relay KR27 Starter Relay - M64 Starter Motor
K2 A/C CLUTCH Relay KR29 A/C Compressor Clutch Relay - Q2 A/C Compressor Clutch
K3 ECM Relay KR75 Engine Controls Ignition Relay - F3UA, F4UA, F5UA, F15UA, F16UA, F17UA Fuses, and KR29 A/C Compressor Clutch Relay
K4 WPR Relay KR12B Windshield Wiper Relay - KR12C Windshield Wiper Speed Control Relay
K5 START/SOL Relay KR27C Starter Pinion Solenoid Actuator Relay - M64 Starter Motor
K8 TRANS/OIL/PUMP Relay KR108 Transmission Hydraulics Oil Pump Relay - Not Used
K9 WPR/SPD Relay KR12C Windshield Wiper Speed Control Relay - M75 Windshield Wiper Motor
K10 STARTER Relay KR23A Fuel Pump Relay - Not Used
K11 HDLP/WASH Relay KR2 Headlamp Washer Pump Relay - Not Used
K12 HI/BEAM Relay KR48 Headlamp High Beam Relay - F36UA, and F37UA Fuses
K13 DRL Relay KR50 Headlamp Relay - F51UA, and F57UA Fuses
K14 RUN/CRANK Relay KR73 Ignition Main Relay - F32UA, F41UA, F42UA, F44UA, F46UA, F47UA, and F52UA Fuses
K15 RR/WDO/MIR/DEFOG Relay KR5 Rear Defogger Relay - F29UA, and F30UA Fuses
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block 
K16 HORN PCB Relay KR3 Horn Relay - F34UA Fuse
K17 SCR PCB Relay - - Not Used
K18 FOG/LMP/FRT PCB Relay KR46 Front Fog Lamp Relay - F39UA Fuse
K19 COOL/PMP PCB Relay KR31 Coolant Pump Relay - Auxiliary - G36 Auxiliary Heater Coolant Pump
K20 EMPTY - - Not Used
K21 WASH/PUMP/RR PCB Relay KR6 Rear Window Washer Pump Relay - G19 Rear Window Washer Pump
K22 WASH/PUMP/FT PCB Relay KR11 Windshield Washer Pump Relay - G24 Windshield Washer Pump
K23 WPR/RR PCB Relay KR7 Rear Wiper Relay - M45 Rear Wiper Motor
NOTE:

Items listed below are diagnostic test points for Wiper/Washer System PCB relays

TP21 - TP21 - KR6 Rear Window Washer Pump Relay
TP22 - TP22 - KR11 Windshield Washer Pump Relay
TP23 - TP23 - KR7 Rear Wiper Relay
NOTE:

Items listed below are diagnostic test points for HVAC PCB relays

TP19-1 - TP19-1 - KR31 Coolant Pump Relay - Auxiliary
TP19-2 - TP19-2 - KR31 Coolant Pump Relay - Auxiliary