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Electrical Center Identification Views

Fig 1: X50A Fuse Block - Underhood - Top View
GM2349013Courtesy of GENERAL MOTORS CORP.
Fig 2: X50A Fuse Block - Underhood - Bottom View
GM2349002Courtesy of GENERAL MOTORS CORP.
Fig 3: X50A Fuse Block - Underhood - Label
GM2349063Courtesy of GENERAL MOTORS CORP.
X50A FUSE BLOCK - UNDERHOOD - FUSE AND RELAY IDENTIFICATION LEGEND

No. Device Label Name Fuse And Relay Description Rating Circuits
J-Case Fuses 
6 WPR F6UA Fuse 30A Windshield Wiper Motor
12 STRTR F12UA Fuse 30A Starter Motor
21 REAR PWR WNDW F21UA Fuse 30A Window Motor - Left Rear, Window Motor - Right Rear
22 S/ROOF F22UA Fuse 30A Sunroof Control Module, Sunroof Shade Module
24 WNDW FRT F24UA Fuse 30A Window Motor - Driver, Window Motor - Passenger
26 ABS PUMP F26UA Fuse 60A Electronic Brake Control Module (EBCM)
27 EPB F27UA Fuse 30A Parking Brake Control Module
28 REAR DEFOG F28UA Fuse 40A Rear Window Defogger Grid Noise Filter Left
41 BRK VAC PUMP F41UA Fuse 20A Brake Booster Pump Motor
42 COOL FAN K2 F42UA Fuse 30A Engine Cooling Fan - Right
45 COOL FAN K1 F45UA Fuse 30A Engine Cooling Fan - Left
Mini Fuses 
1 TCM BATT F1UA Fuse 15A Control Solenoid Valve Assembly
2 ECM BATT F2UA Fuse 5A Engine Control Module (ECM)
5 ECM IGN F5UA Fuse 5A Engine Control Module (ECM)
8 INJ EVEN F8UA Fuse 15A Ignition Coils, Engine Control Module (ECM) (LF1 or LLT)
9 INJ ODD F9UA Fuse 15A Ignition Coils, Engine Control Module (ECM) (LF1 or LLT)
10 ECM F10UA Fuse 20A Engine Control Module (ECM)
11 POST O2 SNSR HTR F11UA Fuse 10A Heated Oxygen Sensors (LF1 or LLT)
13 TRANS IGN/FSCM F13UA Fuse 7.5A Fuel Pump Flow Control Module, Control Solenoid Valve Assembly
16 MAF F16UA Fuse 7.5A Mass Air Flow (MAF) Sensor/Intake Air Temperature (IAT) Sensor (LLT)
17 AIRBAG MDL F17UA Fuse 5A Inflatable Restraint Sensing and Diagnostic Module (SDM)
18 SBZ IGN F18UA Fuse 5A Not Used
23 VARIABLE EFFORT STEERING F23UA Fuse 10A Power Steering Control Module
29 LUM LT F29UA Fuse 15A Seat Lumbar Adjuster Switch - Driver
32 BCM F32UA Fuse 15A Body Control Module (BCM)
33 HTD/SEAT F33UA Fuse 25A Heated Seat Control Module (without A45), Memory Seat Module (A45),
34 ABS VLV F34UA Fuse 25A Electronic Brake Control Module (EBCM)
35 AMP F35UA Fuse 30A Audio Amplifier (UQA)
36 AFS IGN F36UA Fuse 10A Adaptive Forward Lighting (AFL) Motor - Left (TT2), Adaptive Forward Lighting (AFL) Motor - Right (TT2)
37 RT HI BEAM F37UA Fuse 10A Headlamp - Right High Beam (TT4), Headlamp - Right High Beam Solenoid (TT2)
38 LT HI BEAM F38UA Fuse 10A Headlamp - Left High Beam (TT4), Headlamp - Left High Beam Solenoid (TT2)
46 COOL FAN RLY F46UA Fuse 10A Cooling Fan Low Speed Relay, Cooling Fan Left High Speed Relay
47 PRE O2 SNSR HTR F47UA Fuse 10A Heated Oxygen Sensors, Mass Air Flow (MAF) Sensor/Intake Air Temperature (IAT) Sensor (LAF/LF1), Camshaft Position (CMP) Actuators (LLT)
48 FOG LAMP F48UA Fuse 15A Fog Lamp - Left Front (T96), Fog Lamp - Right Front (T96)
49 RT HID F49UA Fuse 15A Headlamp - Right Low Beam (TT2)
50 LT HID F50UA Fuse 15A Headlamp - Left Low Beam (TT2)
51 HORN F51UA Fuse 15A Horn Assembly
52 CLSTR IGN F52UA Fuse 5A Instrument Panel Cluster (IPC)
53 BODY RUN/CRNK F53UA Fuse 10A Air Quality Sensor (UEC), Brake Booster Vacuum Switch, Inside Rearview Mirror (ISRVM), Rearview Camera (UVC)
54 I/P RUN/CRNK F54UA Fuse 5A HVAC Control Module
55 OSRVM/UGDO/WNDW SW F55UA Fuse 7.5A Outside Rearview Mirror Switch (A45), Window Switch - Driver, Window Switch - Passenger (A45), Garage Door Opener (UG1)
56 WSW F56UA Fuse 15A Windshield Washer Fluid Pump
60 HTD MIR F60UA Fuse 7.5A Outside Rearview Mirror - Driver, Outside Rearview Mirror - Passenger
62 CNSTR VENT F62UA Fuse 10A Evaporative Emission (EVAP) Canister Vent Solenoid Valve
64 AFS BATT F64UA Fuse 5A Headlamp Control Module
65 THEFT DTRNT HORN F65UA Fuse 7.5A Not Used
67 FSCM F67UA Fuse 20A Fuel Pump Flow Control Module
69 RVC BATT F69UA Fuse 5A Body Control Module (BCM)
Mini Relays 
7 ECM KR71 Engine Control Module Relay - F8UA, F9UA, F10UA, F11UA, F46UA Fuses
9 COOL FAN KR20K Cooling Fan Right High Speed Relay - Engine Cooling Fan - Right
13 COOL FAN KR20J Cooling Fan Left High Speed Relay - Engine Cooling Fans
15 RUN/CRNK KR73 Ignition Main Relay - F5UA, F13UA, F16UA, F17UA, F18UA, F52UA, F53UA, F54UA Fuses
17 REAR DEFOG KR5 Rear Window Defogger Relay - F28UA, F60UA Fuses
Micro Relays 
2 STRTR KR27 Starter Relay - Starter Motor
4 WPR SPD KR12C Windshield Wiper Speed Control Relay - Windshield Wiper Motor
5 WPR CNTRL KR12B Windshield Wiper Relay - Windshield Wiper Motor
10 COOL FAN KR20C Cooling Fan Low Speed Relay - Engine Cooling Fan - Left
14 HDLP LO BEAM KR49 Headlamp Low Beam Relay - F49UA, F50UA Fuses (TT2)
NOTE: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block.
- - KR3 Horn Relay - F51UA Fuse
- - KR11 Windshield Washer Pump Relay - F56UA Fuse
- - KR46 Front Fog Lamp Relay - F48UA Fuse (T96)
- - KR48 Headlamp High Beam Relay - F37UA, F38UA Fuses
- - KR97 Door Lock Relay - Door Latch Assembly - Driver, Door Latch Assembly - Left Rear, Door Latch Assembly - Passenger, Door Latch Assembly - Right Rear
Fig 4: X50A Fuse Block - Underhood X1
GM2174006Courtesy of GENERAL MOTORS CORP.
X50A Fuse Block - Underhood X1

Pin Wire Circuit Function
1 - - Not Used
2 0.35 RD/YE 4340 Battery Positive Voltage (TT2)
0.35 RD/YE 4340 Battery Positive Voltage (TT2)
3-7 - - Not Used
8 0.5 YE 712 Left Headlamp Low Beam Supply Voltage (TT2)
9-10 - - Not Used
11 0.75 BN/GY 29 Horn Control
12 0.5 YE 312 Right Headlamp Low Beam Supply Voltage (TT2)
13 0.5 WH 311 Right Headlamp High Beam Supply Voltage (TT2)
0.35 WH 311 Right Headlamp High Beam Supply Voltage (TT4)
14 0.35 WH 711 Left Headlamp High Beam Supply Voltage (TT2)
0.5 WH 711 Left Headlamp High Beam Supply Voltage (TT4)
15-19 - - Not Used
20 0.35 WH 2368 Cooling Fan Control Signal
21-29 - - Not Used
30 0.5 GY/VT 228 Windshield Washer Pump Control
31 0.5 BN/VT 2234 Front Fog Lamp Supply Voltage (T96)
32-36 - - Not Used
37 4 RD/WH 342 Battery Positive Voltage
38 1 RD/D-BU 1842 Battery Positive Voltage
39-40 - - Not Used
41 4 BK 1150 Ground
42 - - Not Used
43 4 RD/WH 342 Battery Positive Voltage
44 - - Not Used
45 2.5 GY 532 Cooling Fan Motor Supply Voltage (2)
46 4 GY 532 Cooling Fan Motor Supply Voltage (2)
47 4 WH/D-BU 409 Cooling Fan Motor Supply Voltage (1)
48-49 - - Not Used
50 4 YE 5358 Cooling Fan Motor Supply Voltage (3)
51 - - Not Used
52 0.35 L-GN/VT 335 Low Speed Cooling Fan Relay Control
53 0.35 BN/RD 2700 A/C Pressure Sensor 5 Volt Reference
54 - - Not Used
55 0.35 BK/BN 5514 A/C Refrigerant Pressure Sensor Low Reference
56 - - Not Used
57 0.35 L-GN 380 A/C Refrigerant Pressure Sensor Signal
58-63 - - Not Used
64 0.35 L-GN/VT 335 Low Speed Cooling Fan Relay Control
65-67 - - Not Used
68 0.35 WH 2368 Cooling Fan Control Signal
69-70 - - Not Used
71 0.75 BK 1150 Ground
72 2.5 WH 92 Windshield Wiper Motor High Speed Control
73 2.5 YE/BN 95 Windshield Wiper Motor Low Speed Control
74 1 BK 1350 Ground
75 2.5 L-GN/WH 2968 Transmission Fluid Pump Supply Voltage (HP6)
76-80 - - Not Used
81 0.35 VT/BK 339 Run/Crank Ignition 1 Voltage (UEC)
82 - - Not Used
Connector Part Information 
  • Harness Type: Forward Lamp
  • OEM Connector: 13732286
  • Service Connector: 13576528
  • Description: 82-Way F DSQ 1.5 2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pin: 2
  • Terminated Lead: 13575541
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: Not Available
  • Pins: 8, 11-12, 71, 74,
  • Terminated Lead: 13575780
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 13-14, 20, 30-31, 52-53, 55, 57, 64, 68
  • Terminated Lead: 13575773
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: E/A
  • Pins: 37, 41, 43, 46, 47, 50
  • Terminated Lead: 13575718
  • Release Tool: J-38125-558
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
  • Pin: 38
  • Terminated Lead: 13575465
  • Release Tool: J-38125-558
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12065915/5
  • Core/Insulation Crimp: C/A
  • Pins: 72, 73, 75
  • Terminated Lead: 13327116
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Not Available
  • Core/Insulation Crimp: Not Available
  • Pins: 81
  • Terminated Lead: 13575761
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Not Available
  • Core/Insulation Crimp: Not Available
Fig 5: X50A Fuse Block - Underhood X2
GM2174004Courtesy of GENERAL MOTORS CORP.
X50A Fuse Block - Underhood X2

Pin Wire Circuit Function
1 1.0 GY 3288 Left Headlamp Low Beam Relay Supply Voltage (TT2)
2-3 - - Not Used
4 1.5 GY 295 Door Lock Actuator Lock Control
5 1.5 WH/D-BU 3266 Child Security Lock Motor Unlock Control
6-7 - - Not Used
8 1.0 GY 3288 Left Headlamp Low Beam Relay Supply Voltage (TT2)
9 0.5 RD/D-BU 1040 Battery Positive Voltage (LAF with NU6)
10-11 - - Not Used
12 1.5 GY/L-GN 3271 Door Lock Control (2)
13 0.35 VT/YE 3267 Child Security Lock Relay Control
14 0.35 VT/WH 1139 Run/Crank Ignition 1 Voltage
15 0.35 VT/WH 639 Run/Crank Ignition 1 Voltage (UFT)
16 0.35 VT/D-BU 5294 Powertrain Main Relay Fused Supply (LAF with NU6)
17 0.35 L-GN/VT 5199 Run/Crank Relay Coil Control
18 - - Not Used
19 0.35 BN/WH 1317 Fog Lamp Relay Control (T96)
20 0.5 RD/D-BU 1040 Battery Positive Voltage (LAF with NU6)
21 - - Not Used
22 0.35 GY 91 Windshield Wiper Motor Relay Coil Supply Voltage
23 - - Not Used
24 0.35 BN/YE 1970 Headlamp Low Beam Relay Control (TT2)
25 0.35 BN/WH 28 Horn Relay Control
26 0.35 VT/GY 139 Run/Crank Ignition 1 Voltage
27 0.35 RD/D-BU 840 Battery Positive Voltage (NV7)
28 0.5 RD/VT 1940 Battery Positive Voltage
29 0.35 VT/GY 539 Run/Crank Ignition 1 Voltage
30 - - Not Used
31 0.35 VT/BK 339 Run/Crank Ignition 1 Voltage
32 - - Not Used
33 2.5 RD/WH 1340 Battery Positive Voltage
2.5 RD/WH 1340 Battery Positive Voltage
34 2.5 RD/GY 3540 Battery Positive Voltage (C3U)
35 - - Not Used
36 2.5 RD/D-BU 1240 Battery Positive Voltage
2.5 RD/D-BU 1240 Battery Positive Voltage
37 4.0 BN/YE 78 Air Injection Reaction Pump Supply Voltage (LAF with NU6)
38 - - Not Used
39 2.5 BN/VT 293 Rear Defog Element Supply Voltage
40 - - Not Used
41 4.0 RD/YE 442 Battery Positive Voltage
42 2.5 RD/VT 1640 Battery Positive Voltage
43 - - Not Used
44 0.5 RD/GY 1342 Battery Positive Voltage
45 0.35 WH/VT 860 Front Windshield Wiper Switch High Signal
46 - - Not Used
47 0.35 VT/D-BU 5294 Powertrain Main Relay Fused Supply (LAF with NU6)
48-57 - - Not Used
58 0.35 BN/VT 1969 Headlamp High Beam Relay Control
59 - - Not Used
60 0.35 BN/GY 2268 Windshield Washer Relay Control
61 0.35 BN/VT 193 Rear Defog Relay Control
62 0.35 BN/YE 2267 Mirror Heating Element Supply Voltage
63 0.35 RD/YE 740 Battery Positive Voltage (TT2)
64 0.35 RD/L-GN 3140 Battery Positive Voltage (UFT)
65-67 - - Not Used
68 0.5 RD/WH 3440 Battery Positive Voltage
69 1.5 RD/L-GN 5140 Battery Positive Voltage (A45/KA1)
70 1.5 RD/GY 1042 Battery Positive Voltage
71 2.5 RD/YE 3740 Battery Positive Voltage (UQA)
72 0.35 RD/YE 2340 Battery Positive Voltage
73 0.35 RD/L-GN 2440 Battery Positive Voltage
74 2.5 RD/VT 2640 Battery Positive Voltage
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 13732284
  • Service Connector: 13576544
  • Description: 74-Way F DSQ 1.5 2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pins: 1, 8, 68, 72, 73
  • Terminated Lead: 13575780
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: Pins: 1, 8, 68 - E/A
  • Core/Insulation Crimp: Pins: 72, 73 - Not Available
  • Pins:4, 5, 69, 70, 74
  • Terminated Lead: 13575781
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: 4/A
  • Pins: 34, 37, 39, 41-42
  • Terminated Lead: 13575718
  • Release Tool: J-38125-558
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
  • Pins: 9, 13-17, 19, 20, 22, 24-29, 31, 45, 47, 58, 60-64
  • Terminated Lead: 13575773
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: Pins: 9, 20, 28 - E/A
  • Core/Insulation Crimp: Pins: 13-17, 19, 22, 24-27, 29, 31, 45, 47, 58, 60-64 - Not Available
  • Pins: 33, 36
  • Terminated Lead: 13575718
  • Release Tool: J-38125-558
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12092445/18
  • Core/Insulation Crimp: Not Available
  • Pins: 44
  • Terminated Lead: 13575774
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: E/A
  • Pins: 71
  • Terminated Lead: 13575491
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: 4/A
  • Pins: 12
  • Terminated Lead: 13578869
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: Not Available
Fig 6: X50A Fuse Block - Underhood X3
GM2220560Courtesy of GENERAL MOTORS CORP.
X50A Fuse Block - Underhood X3

Pin Wire Circuit Function
1 1.0 VT/D-BU 5290 Powertrain Main Relay Fused Supply (1)
2 0.75 VT/D-BU 5291 Powertrain Main Relay Fused Supply (2)
3 0.75 VT/D-BU 5292 Powertrain Main Relay Fused Supply (3) (LF1/LLT)
4 0.5 VT/BK 2139 Run/Crank Ignition 1 Voltage
0.5 VT/BK 2139 Run/Crank Ignition 1 Voltage
5 2.5 YE 6 Starter Solenoid Crank Voltage
6 0.5 VT/D-BU 5293 Powertrain Main Relay Fused Supply (4)
7 0.5 VT/D-BU 5294 Powertrain Main Relay Fused Supply (5) (LF1/LLT)
8 0.5 VT/WH 239 Run/Crank Ignition 1 Voltage (LLT)
9 - - Not Used
10 0.5 D-BU/BK 421 Air Injection Reaction Solenoid Relay Coil Control (LAF with NU6)
11 0.5 VT/GY 6386 Starter Enable Relay (PPEI 3) Control
12 0.5 L-GN/D-BU 436 Air Injection Reaction Pump Relay Coil Control (LAF with NU6)
13-14 - - Not Used
15 0.5 BN/YE 473 High Speed Cooling Fan Relay Control
16 0.5 GY/D-BU 415 Air Injection Reaction Solenoid Supply Voltage (LAF with NU6)
17 0.5 YE 5991 Powertrain Relay Coil Control
18 0.5 L-GN/VT 335 Low Speed Cooling Fan Relay Control
19 - - Not Used
20 0.5 VT/L-GN 439 Run/Crank Ignition 1 Voltage
21 1.5 BK 2650 Ground
22-26 - - Not Used
27 0.75 RD/BN 440 Battery Positive Voltage (LAF)
0.5 RD/BN 440 Battery Positive Voltage (LF1 or LLT)
28-31 - - Not Used
32 0.5 L-GN 380 A/C Refrigerant Pressure Sensor Signal
33-36 - - Not Used
37 0.75 RD/D-GN 1840 Battery Positive Voltage (LAF)
38 0.5 BN/RD 2700 A/C Pressure Sensor 5 Volt Reference
39 0.5 BK/BN 5514 A/C Refrigerant Pressure Sensor Low Reference
40-45 - - Not Used
46 0.5 BN/YE 473 High Speed Cooling Fan Relay Control
0.5 BN/YE 473 High Speed Cooling Fan Relay Control
47-48 - - Not Used
49 0.5 L-GN/VT 335 Low Speed Cooling Fan Relay Control (LAF)
0.5 L-GN/VT 335 Low Speed Cooling Fan Relay Control (LAF)
50 - - Not Used
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 13732282
  • Service Connector: 13505902
  • Description: 50-Way F 1.5/2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pins: 1-3, 27
  • Terminated Lead: 13575780
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 5
  • Terminated Lead: 13327116
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Not Available
  • Core/Insulation Crimp: Not Available
  • Pin: 6-8, 10-12, 15-18, 20
  • Terminated Lead: Pending
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-2A (GY)
  • Terminal/Tray: 965914-1/32
  • Core/Insulation Crimp: K/K
  • Pins: 32, 38, 39
  • Terminated Lead: Pending
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: E/A
  • Pins: 4, 46, 49
  • Terminated Lead: 13575541
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: C/A
Fig 7: X50D Fuse Block - Battery - Top View
GM2354594Courtesy of GENERAL MOTORS CORP.
X50D Fuse Block - Battery - Usage

No. Device Name Device Assigned Name Rating Description
1 IEC-1 F1UB Fuse 100A Fuse Block - I/P
2 IEC-2 F2UB Fuse 100A Fuse Block - I/P
3 REC-1 F3UB Fuse 100A Fuse Block - Rear Left
4 REC-2 F4UB Fuse 100A Fuse Block - Rear Left
5 UEC F5UB Fuse 250A Fuse Block - Underhood
6 STRT F6UB Fuse 300A Starter Motor
X50D Fuse Block - Battery X1

Pin Wire Circuit Function
A 35.0 RD 1 Battery Positive Voltage
X50D Fuse Block - Battery X2

Pin Wire Circuit Function
A 35.0 RD 4042 Battery Positive Voltage
X50D Fuse Block - Battery X3

Pin Wire Circuit Function
A 32.0 RD 2 Battery Positive Voltage
X50D Fuse Block - Battery X4

Pin Wire Circuit Function
A 10.0 RD/BK 42 Battery Positive Voltage
X50D Fuse Block - Battery X5

Pin Wire Circuit Function
A 10.0 RD/BU 1642 Battery Positive Voltage
X50D Fuse Block - Battery X6 (DB3, KU1, F45, F46, UWG or UVD)

Pin Wire Circuit Function
A 10.0 RD/YE 1242 Battery Positive Voltage
X50D Fuse Block - Battery X7 (ATH, UD7 or UFT)

Pin Wire Circuit Function
A 10.0 RD/WH 642 Battery Positive Voltage
Terminal Part Information 
  • Harness: Battery
  • Terminal: 15327720
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Battery
  • Terminal: 13535874
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Battery
  • Terminal: 10730988
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Body
  • Terminal: 13605716
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Body
  • Terminal: 13605717
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Terminal Part Information 
  • Harness Type: Body
  • Terminal: 13605714
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Terminal Part Information 
  • Harness Type: Body
  • Terminal: 13605715
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Fig 8: X51A Fuse Block - Instrument Panel - Top View Fuses
GM2354599Courtesy of GENERAL MOTORS CORP.
FUSE BLOCK - I/P FUSE IDENTIFICATION LEGEND

No. Device Name Device Assigned Name Rating Description
1 SWC-BKLT F1DA Fuse 2A Steering Wheel Control Switch - Left, Steering Wheel Control Switch - Right
2 BCM 7 F2DA Fuse 15A Body Control Module (BCM)
3 BCM 5 F3DA Fuse 15A Body Control Module (BCM)
4 RDO F4DA Fuse 15A Radio
5 ONSTAR/UHP F5DA Fuse 7.5A Vehicle Communications Interface Module (VCIM) (UE1)
6 PWR OUTLET 1 F6DA Fuse 20A Accessory Power Outlet - Center Console 1
7 PWR OUTLET 2 F7DA Fuse 20A Accessory Power Outlet - Center Console 2
8 BCM 1 F8DA Fuse 15A Body Control Module (BCM)
9 BCM 4 F9DA Fuse 15A Body Control Module (BCM)
10 BCM 8 F10DA Fuse 30A Body Control Module (BCM)
11 FRT HVAC F11DA Fuse 40A HVAC Control Module
12 PASS/SEAT F12DA Breaker 25A Seat Adjuster Switch - Passenger (AG2)
13 DRVR/SEAT F13DA Breaker 25A Memory Seat Module (MSM) (A45), Seat Adjuster Switch - Driver (without A45)
14 DLC F14DA Fuse 7.5A Data Link Connector (DLC)
15 AIRBAG F15DA Fuse 10A Inflatable Restraint Sensing and Diagnostic Module (SDM)
16 TRUNK F16DA Fuse 10A Rear Compartment Lid Latch
17 HVAC/CNTRL F17DA Fuse 10A HVAC Control Module
18 BATT F18DA Fuse 25A F4DA Fuse, F5DA Fuse
19 DISPLAY F19DA Fuse 10A Head Up Display (HUD) (UV6), Info Display Module, Multimedia Player Interface Module (KTA), Radio/HVAC Control (UYS)
20 AOS F20DA Fuse 5A Inflatable Restraint Passenger Presence System (PPS) Module (AW7)
21 IPC F21DA Fuse 5A Instrument Panel Cluster (IPC)
22 DLIS F22DA Fuse 2A Ignition Switch (without BTM)
23 BCM 3 F23DA Fuse 15A Body Control Module (BCM)
24 BCM 2 F24DA Fuse 15A Body Control Module (BCM)
25 - - - Not Used
26 ACDC INV F26DA Fuse 30A Accessory AC/DC Power Control Module (KI6)
Fig 9: X51A Fuse Block - Instrument Panel - Top View Relays
GM2355276Courtesy of GENERAL MOTORS CORP.
X51A FUSE BLOCK - INSTRUMENT PANEL - TOP VIEW RELAY IDENTIFICATION LEGEND

No. Device Label Name Relay Description Rating Circuits
1 Accessory Relay KR76 Retained Accessory Power Relay - F6DA Fuse, F7DA Fuse
2 - - - Not Used
3 Rear Compartment Lid Release Relay KR95B Compartment Lid Release Relay - F16DA Fuse
Fig 10: X51A Fuse Block - Instrument Panel - Bottom View Fuses
GM2405334Courtesy of GENERAL MOTORS CORP.
X51A Fuse Block - Instrument Panel - Wire Entry Fuses

Pin Wire Circuit Function
16 0.35 BN 6136 Supply Voltage
17 0.5 YE 6817 LED Backlight Dimming Control
18 1.0 RD/D-BU 4540 Battery Positive Voltage
19 2.5 GY/GN 70 RAP Relay Switch Supply Voltage
20 0.35 RD/D-GN 40 Battery Positive Voltage
21 0.5 RD/D-GN 3840 Battery Positive Voltage
22 0.5 RD 340 Battery Positive Voltage
23 1.0 D-GN/WH 1301 Retained Accessory Power Fuse Supply Voltage
24 1.0 VT 1301 Retained Accessory Power Fuse Supply Voltage
25 0.35 RD/WH 4440 Battery Positive Voltage
26 0.5 RD 2940 Battery Positive Voltage
27 0.35 RD/VT 5340 Battery Positive Voltage
28 1.0 RD/BK 4540 Battery Positive Voltage
29 0.75 VT 1001 Retained Accessory Power Fuse Supply Voltage
30 0.75 D-GN/WH 801 Retained Accessory Power Fuse Supply Voltage
31 0.35 BN/D-BU 382 Trunk Release Enable Relay Switch Supply Voltage
32 0.35 RD/VT 3340 Battery Positive Voltage
33 0.5 RD/WH 2740 Battery Positive Voltage
34 0.5 RD/BK 2540 Battery Positive Voltage
35 1.5 RD/VT 4040 Battery Positive Voltage
36 2.5 RD/VT 542 Battery Positive Voltage
37 1.5 RD/BK 1440 Battery Positive Voltage
38 1.5 RD/YE 5040 Battery Positive Voltage
39 1.0 RD/BK 4540 Battery Positive Voltage
1.0 RD/D-BU 4540 Battery Positive Voltage
40 0.35 RD/D-BU 3240 Battery Positive Voltage
41 0.35 RD/WH 2040 Battery Positive Voltage
42 0.35 RD/BK 2840 Battery Positive Voltage
43 0.35 RD/D-BU 540 Battery Positive Voltage (without BTM)
44 0.5 RD/BK 2140 Battery Positive Voltage
45 0.5 RD/BN 2240 Battery Positive Voltage
46 - - Not Used
47 1.5 RD/VT 4640 Battery Positive Voltage (without UY1)
48 10.0 RD/WH 42 Battery Positive Voltage
49 10.0 RD/WH 1642 Battery Positive Voltage
Connector Part Information 
  • Harness Type: Instrument Panel
  • OEM Connector: 13595188
  • Description: 49-Way Fuse Block
Terminal Part Information 
  • Pins: 16, 20, 25, 27, 31-32, 40-43
  • Terminated Lead: 13575780
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: Not Available
  • Pins: 17-18, 21-24, 26, 28-30, 33-34, 44-45
  • Terminated Lead: 13575780
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 19
  • Terminated Lead: 13575540
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-42 (RD)
  • Terminal/Tray: 15396853/23
  • Core/Insulation Crimp: 4/D
  • Pins: 35
  • Terminated Lead: 13327178
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-43 (RD)
  • Terminal/Tray: 15343823/19
  • Core/Insulation Crimp: G/F/G/1
  • Pin: 36
  • Terminated Lead: 13327178
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-43 (RD)
  • Terminal/Tray: 15343823/19
  • Core/Insulation Crimp: G/F/G
  • Pins: 37-39, 47
  • Terminated Lead: 13575781
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: 4/A
  • Pins: 48-49
  • Terminated Lead: Pending
  • Release Tool: No Tool Reqd
  • Diagnostic Test Probe: No Tool Reqd
  • Terminal/Tray: 13595182//A
  • Core/Insulation Crimp: Not Available
Fig 11: X51A Fuse Block - Instrument Panel - Bottom View Relays
GM2353347Courtesy of GENERAL MOTORS CORP.
X51A Fuse Block - Instrument Panel - Wire Entry Relays

Pin Wire Circuit Function
1 0.5 BK 1550 Ground
2 - - Not Used
3 0.5 GY/YE 6188 Lift Glass/Trunk Motor Release Control
4 0.5 BN/D-BU 382 Trunk Release Enable Relay Switch Supply Voltage
5 0.5 D-BU/YE 6795 Lift Glass/Trunk Motor Release Control 2
6-10 - - Not Used
11 0.5 GY/VT 755 RAP Relay Coil Control
12 - - Not Used
13 0.5 BK 1550 Ground
14 2.5 GY/GN 70 RAP Relay Switch Supply Voltage
15 1.0 D-GN/WH 1301 Battery Positive Voltage
1.0 VT 1301 Retained Accessory Power Fuse Supply Voltage
Connector Part Information 
  • Harness Type: Instrument Panel
  • OEM Connector: 13595183
  • Description: 15-Way Fuse Block (BK)
Terminal Part Information 
  • Pin: 1, 3-5, 11, 13
  • Terminated Lead: 13327158
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-42 (RD)
  • Terminal/Tray: 15344769/23
  • Core/Insulation Crimp: Not Available
  • Pins: 14-15
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-42 (RD)
  • Terminal/Tray: 15344769/23
  • Core/Insulation Crimp: F/B
Fig 12: X53A Fuse Block - Rear Body - Top View
GM2354605Courtesy of GENERAL MOTORS CORP.
X53A FUSE BLOCK - REAR BODY - FUSE AND RELAY IDENTIFICATION LEGEND

No. Device Label Name Fuse And Relay Description Rating Circuits
Fuses 
1-5 - - - Not Used
6 STRG WHL HTR F6RA Fuse 7.5A Heated Steering Wheel Control Module (UVD)
7-10 - - - Not Used
11 - F11RA Fuse 40A Spare
12 - F12RA Fuse 5A Spare
13 - F13RA Fuse 30A Spare
14-15 - - - Not Used
16 UPA/SPZ F16RA Fuse 5A Rear Object Sensor Control Module (UD7), Side Object Sensor - Left (UFT), Side Object Sensor - Right (UFT)
17 - F17RA Fuse 25A Spare
18 PEPS BATT F18RA Fuse 5A Passive Entry Passive Start Module (BTM)
19 - - - Not Used
20 OSM F20RA Fuse 10A Rear Window Sunshade Control Module (DB3), Seat Back Ventilation Heating and Cooling Module - Driver (KU1, Seat Cushion Ventilation Heating and Cooling Module - Driver (KU1), Seat Back Ventilation Heating and Cooling Module - Passenger (KU3), Seat Cushion Ventilation Heating and Cooling Module - Passenger (KU3)
21-30 - - - Not Used
31 SADS F31RA Fuse 10A Electronic Suspension Control (ESC) Module (F45)
32 RSE F32RA Fuse 10A Video Display - Driver Seatback (UWG), Video Display - Passenger Seatback (UWG)
33 AWD F33RA Fuse 10A Rear Differential Clutch Control Module (F46)
34 - - - Not Used
35 PEPS MTR F35RA Fuse 30A Passive Entry Passive Start Module (BTM)
36 - F36RA Fuse 40A Spare
37 - - - Not Used
Relays 
1 - - - Not Used
2 Ignition Main Relay KR73 Ignition Main Relay - F20RA Fuse
3 Ignition Run Relay KR74 Ignition Run Relay - F6RA Fuse
4 - - - Not Used
Fig 13: X53A Fuse Block - Rear Body - Bottom View
GM2355270Courtesy of GENERAL MOTORS CORP.
Fig 14: X53A Fuse Block - Rear Body X1 (ATH, BTM, DB3, F45, F46, KA1, UD7, UFT, UVD, or UWG)
GM2180241Courtesy of GENERAL MOTORS CORP.
X53A Fuse Block - Rear Body X1 (ATH, BTM, DB3, F45, F46, KA1, UD7, UFT, UVD, or UWG)

Pin Wire Circuit Function
1 - - Not Used
2 1.5 RD/D-BU 5240 Battery Positive Voltage (ATH)
3-5 - - Not Used
6 0.35 RD/D-BU 1542 Battery Positive Voltage (F46)
7-17 - - Not Used
18 0.35 RD/BN 4240 Battery Positive Voltage (UWG)
19 - - Not Used
20 0.35 RD/WH 640 Battery Positive Voltage (BTM)
21 - - Not Used
22 0.35 L-GN/VT 5199 Run/Crank Relay Coil Control (DB3 or KA1)
23-24 - - Not Used
25 0.35 VT/BN 241 Run Ignition 3 Voltage (UVD)
26 0.35 RD/GY 1740 Battery Positive Voltage (F45)
27-31 - - Not Used
32 0.75 VT/BK 1239 Run/Crank Ignition 1 Voltage (DB3 with KU1 or KU3)
0.35 VT/BK 1239 Run/Crank Ignition 1 Voltage (DB3 without KU1 or KU3)
33-36 - - Not Used
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 13709529
  • Service Connector: 13576555
  • Description: 36-Way F DSQ 1.5/2.8/Ducon 6.3 Series (BK)
Terminal Part Information 
  • Pin: 2
  • Terminated Lead: 13575781
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: 4/A
  • Pin: 32 (DB3 with KU1 or KU3)
  • Terminated Lead: 13575774
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: E/A
  • Pin: 20
  • Terminated Lead: 13575780
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 6, 18, 22, 25-26, 32 (DB3 without KU1 or KU3)
  • Terminated Lead: 13575773
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: Not Available
Fig 15: X53A Fuse Block - Rear Body X2 (DB3, KU1, or UVD)
GM2231649Courtesy of GENERAL MOTORS CORP.
X53A Fuse Block - Rear Body X2 (DB3, KU1, or UVD)

Pin Wire Circuit Function
1-5 - - Not Used
6 0.35 VT 5486 Run Relay Coil Control (UVD)
7-35 - - Not Used
36 0.75 BK 2350 Ground (DB3, KU1 or UVD)
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 13709530
  • Service Connector: 13576556
  • Description: 36-Way F DSQ 1.5/2.8/Ducon 6.3 Series (GY)
Terminal Part Information 
  • Pin: 6
  • Terminated Lead: 13575773
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: Not Available
  • Pin: 36
  • Terminated Lead: 13575780
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
Fig 16: X53A Fuse Block - Rear Body X4 (ATH, DB3, KU1, F45, F46, UD7, UFT, UWG or UVD)
GM2179773Courtesy of GENERAL MOTORS CORP.
X53A Fuse Block - Rear Body X4 (ATH, DB3, KU1, F45, F46, UD7, UFT, UWG or UVD)

Pin Wire Circuit Function
1 10.0 RD/YE 1242 Battery Positive Voltage (DB3, KU1, F45, F46, UWG or UVD)
2 10.0 RD/WH 642 Battery Positive Voltage (ATH, UD7 or UFT)
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 15344936
  • Service Connector: Pending
  • Description: 2-Way F DUCON 9.5 Series (GN)
Terminal Part Information 
  • Terminated Lead: Service by Harness - See Part Catalog
  • Release Tool: Not Available
  • Diagnostic Test Probe: Not Available
  • Terminal/Tray: Not Available
  • Core/Insulation Crimp: Not Available
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