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Electrical Center Identification Views

Fig 1: X50A Fuse Block - Underhood Label
GM2285690Courtesy of GENERAL MOTORS CORP.
X50A FUSE BLOCK - UNDERHOOD FUSE AND RELAY IDENTIFICATION LEGEND

No. Device Label Name Fuse And Relay Description Rating Circuits
1 AC CLTCH Fuse F1U Fuse 10 A KR29 A/C Compressor Clutch Relay
2 TCM Fuse F2U Fuse 15 A Q8 Control Solenoid Valve Assembly (MYB/MYC)
3-4 - - - Not Used
5 ECM Fuse F5U Fuse 15 A K20 Engine Control Module
6 WIPER Fuse F6U Fuse 30 A KR12B Windshield Wiper relay, and KR12C Windshield Wiper Speed Control Relay
7 02 PRE Fuse F7U Fuse 10 A Q6A Camshaft Position (CMP) Actuator Solenoid Valve - Bank 1 Exhaust (LLT), Q6B Camshaft Position (CMP) Actuator Solenoid Valve - Bank 1 Intake (LLT), Q6C Camshaft Position (CMP) Actuator Solenoid Valve - Bank 2 Exhaust (LLT), Q6D Camshaft Position (CMP) Actuator Solenoid Valve - Bank 2 Intake (LLT), Q12 Evaporative Emission (EVAP) Purge Solenoid Valve, B52C Heated Oxygen Sensor Bank 1 Sensor 1, and B52E Heated Oxygen Sensor Bank 2 Sensor 1
8 02 POST Fuse F8U Fuse 10 A B52DHeated Oxygen Sensor Bank 1 Sensor 2, and B52F Heated Oxygen Sensor Bank 2 Sensor 2
9 INJ EVEN Fuse F9U Fuse 20 A K20 Engine Control Module (LLT), Q17B Fuel Injector 2 (L99/LS3), Q17D Fuel Injector 4 (L99/LS3), Q17F Fuel Injector 6 (L99/LS3), Q17H Fuel Injector 8 (L99/LS3), T8B Ignition Coil 2, T8D Ignition Coil 4, and T8F Ignition Coil 6, T8H Ignition Coil 8 (L99/LS3)
10 INJ ODD Fuse F10U Fuse 20 A K20 Engine Control Module (LLT), Q17A Fuel Injector 1 (L99/LS3), Q17C Fuel Injector 3 (L99/LS3), Q17E Fuel Injector 5 (L99/LS3), Q17G Fuel Injector 7 (L99/LS3), Q17A Ignition Coil 1, Q17C Ignition Coil 4, and Q17E Ignition Coil 5, Q17G Ignition Coil 7 (L99/LS3)
11 COOL FAN RLY Fuse F11U Fuse 10 A KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, and KR20C Cooling fan Low Speed Relay
12 STARTER Fuse F12U Fuse 30 A KR27 Starter Relay
13 - - - Not Used
14 MAF/CCC Fuse F14U Fuse 7.5 A K27 Fuel Pump Control Module, B75B Mass Air Flow/Intake Air Temperature Sensor, M47 Reverse Inhibit Solenoid Actuator (MV5/M10), Q34 Skip Shift Solenoid Actuator (M10), Q43 Valve Lifter Oil Manifold Assembly (L99), and B115 Vehicle Speed Sensor (MV5)
15 IGN Fuse F15U Fuse 5 A P16 Instrument Cluster
16 RUN/CRNK IP Fuse F16U Fuse 5 A K33 HVAC Control Module
17 SDM/IGN Fuse F17U Fuse 5 A K36 Inflatable Restraint Sensing and Diagnostic Module
18 RUN/CRNK BODY Fuse F18U Fuse 10 A P14 Passenger Air Bag Disable Indicator, and A10 Inside Rearview Mirror
19 TCM/IGN Fuse F19U Fuse 20 A Q8 Control Solenoid Valve Assembly (MYB/MYC)
20 ECM/IGN Fuse F20U Fuse 15 A K20 Engine Control Module
21 - - - Not Used
22 BRK VAC PUMP Fuse F22U Fuse 20 A KR14 Brake Booster Pump Motor Relay
23-24 - - - Not Used
25 PWR WDO REAR Fuse F25U Fuse 30 A X210
26 PWR WDO FRT Fuse F26U Fuse 30 A M74D Window Motor - Driver, and M74P Window Motor - Passenger
27 DEFOG REAR Fuse F27U Fuse 40 A E18 Rear Defogger Grid, and R14R Rear Window Defogger Noise Filter - Right
28-30 - - - Not Used
31 OSRVM Fuse F31U Fuse 7.5 A S52 Outside Rearview Mirror Switch
32 CAN VENT SOL Fuse F32U Fuse 10 A Q13 Evaporative Emission (EVAP) Vent Solenoid Valve
33 BCM 6 Fuse F33U Fuse 20 A K9 Body Control Module
34 S ROOF Fuse F34U Fuse 25 A K61 Sunroof Control Module (CF5)
35 FRT HTD SEATS Fuse F35U Fuse 25 A K29 Seat Heating Control Module (KA1)
36-37 - - - Not Used
38 WSW PUMP FRT Fuse F38U Fuse 15 A G24 Windshield Washer Pump
39 - - - Not Used
40 ABS VALVE Fuse F40U Fuse 25 A K17 Electronic Brake Control Module (EBCM)
41 COOL FAN HI Fuse F41U Fuse 30 A KR20D Cooling Fan High Speed Relay
42 FRT HVAC Fuse F42U Fuse 40 A K8 Blower Motor Control Module
43 ABS PMP Fuse F43U Fuse 40 A K17 Electronic Brake Control Module (EBCM)
44 COOL FAN LOW Fuse F44U Fuse 30 A KR20C Cooling Fan Low Speed Relay
45 - - - Not Used
46 HID HDLP LF Fuse F46U Fuse 20 A T7L Headlamp Ballast - Left (T4F)
47 HID HDLP RF Fuse F47U Fuse 20 A T7R Headlamp Ballast - Right (T4F)
48-49 - - - Not Used
50 FOG LAMP Fuse F50U Fuse 15 A E29LF Fog Lamp - Left Front (T3U), and E29RF Fog Lamp - Right Front (T3U)
51 HORN Fuse F51U Fuse 15 A P12B Horn - Low Note, and P12A Horn - High Note
52 SPARE Fuse F52U Fuse 15 A Not Used
53-54 - - - Not Used
55 HI BEAM RT Fuse F55U Fuse 10 A E13R Headlamp - Right (T4A), M28R High Beam Solenoid Actuator - Right (T4F)
56 HI BEAM LT Fuse F56U Fuse 10 A E13L Headlamp - Left (T4A), M28L High Beam Solenoid Actuator - Left (T4F)
57-60 - - - Not Used
61 HTD MIR Fuse F61U Fuse 7.5 A A9A Outside Rearview Mirror - Driver (DD1), and A9B Outside Rearview Mirror - Passenger (DD1)
K26 PWR/TRN Relay KR75 Powertrain Relay - KR29 A/C Compressor Clutch Relay, and ECM/F5U, 02 PRE/F7U, 02 POST/F8U, INJ EVEN/F9U, INJ ODD/F10U, COOL FAN RLY/F11U Fuses
K50 RUN/CRNK Relay KR74 Ignition Run Relay - MAF/CCC/F14U, IGN/F15U, RUN/CRNK IP/F16U, SDM/IGN/F17U, RUN/CRNK BODY/F18U, TCM/IGN/F19U, and ECM/IGN/F20U Fuses
K55 DEFOG RR Relay KR5 Rear Defogger Relay - DEFOG REAR/F27U, and HTD MIR/F61U Fuses
K61 STRTR (HC) Relay KR27 Starter Relay - M64 Starter Motor
K69 WPR CNTRL Relay KR12B Windshield Wiper Relay - KR12C Windshield Wiper Speed Control Relay
K612 COOL FAN HI (HC) Relay KR20D Cooling Fan High Speed Relay - G10L Cooling Fan Motor - Left, KR20E Cooling Fan Speed Control Relay
K613 COOL FAN LOW (HC) Relay KR20C Cooling Fan Low Speed Relay - G10R Cooling Fan Motor - Right
K614 COOL FAN CNTRL Relay KR20E Cooling Fan Speed Control Relay - G10L Cooling Fan Motor - Left
K617 AC CLTCH Relay KR29 A/C Compressor Clutch Relay - Q2 A/C Compressor Clutch
K619 WPR SPD Relay KR12C Windshield Wiper Speed Control Relay - M75 Windshield Wiper Motor
K627 HID HDLP Relay KR49 Headlamp Low Beam Relay - HID HDLP LF/F46U, and HID HDLP RF/F47U Fuses
K632 VAC PMP Relay KR14 Brake Booster Pump Motor Relay - G6 Brake Booster Pump - Auxiliary (LLT)
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block 
- Fog Lamp PCB Relay KR46 Front Fog Lamp Relay - FOG LAMP/F50U Fuse
- HI BEAM PCB Relay KR48 Headlamp High Beam Relay - HI BEAM LT/F56U, and HI BEAM RT/F55U Fuses
- HORN PCB Relay KR3 Horn Relay - HORN/F51U Fuse
- WASHER FRT PCB Relay KR11 Windshield Washer Pump Relay - WSW PUMP FRT/F38U Fuse
Fig 2: X50A Fuse Block - Underhood Top View
GM2285692Courtesy of GENERAL MOTORS CORP.
Fig 3: X50A Fuse Block - Underhood Bottom View
GM2285693Courtesy of GENERAL MOTORS CORP.
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 2 RD/BK 1042 Battery Positive Voltage
3-7 - - Not Used
8 0.8 L-GN/BK 311 Right Headlamp High Beam Supply Voltage (T4A)
0.5 L-GN/BK 311 Right Headlamp High Beam Supply Voltage (T4F)
9 0.8 D-GN/WH 711 Left Headlamp High Beam Supply Voltage (T4A)
0.5 D-GN/WH 711 Left Headlamp High Beam Supply Voltage (T4F)
10 1 YE 712 Left Headlamp Low Beam Supply Voltage (T4F)
11 1 TN/WH 312 Right Headlamp Low Beam Supply Voltage (T4F)
12 0.5 PU 2234 Front Fog Lamp Supply Voltage (T3U)
13 0.8 OG 228 Windshield Washer Pump Control
14-31 - - Not Used
32 0.8 D-GN 29 Horn Control
33 - - Not Used
34 5 RD/BK 542 Battery Positive Voltage
35 3 RD/BK 442 Battery Positive Voltage
36-40 - - Not Used
41 3 BK 1150 Ground
42-45 - - Not Used
46 3 GY 532 Cooling Fan Motor Supply Voltage
47-48 - - Not Used
49 3 L-BU 409 Cooling Fan Motor Supply Voltage
50 3 WH 504 Low Reference
51-70 - - Not Used
71 0.8 BK 1150 Ground
72 - - Not Used
73 3 BK 1350 Ground
74 - - Not Used
75 2 D-GN 95 Windshield Wiper Motor Low Speed
76-77 - - Not Used
78 2 PU 92 Windshield Wiper Motor High Speed
79-82 - - Not Used
Connector Part Information 
  • Harness Type: Forward Lamp
  • OEM Connector: 13600400
  • Service Connector: 13576528
  • Description: 82-Way F DSQ 1.5 2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pins: 2, 75, 78
  • 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: 6
  • Terminated Lead: Pending
  • Release Tool: J-38125-558
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: Not Available
  • Pins: 7-12, 71
  • 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, 32, 51
  • 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: 14
  • 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: 34, 35, 41, 46, 49, 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: 73
  • Terminated Lead: 13578867
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • 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
1-7 - - Not Used
8 0.35 PK/WH 1970 Headlamp Low Beam Relay Control
9 0.35 TN 860 Front Windshield Wiper Switch High Signal
10 0.35 PK 239 Ignition Voltage
11 0.35 PK 139 Ignition 1 Voltage
12 0.35 PK 539 Ignition Voltage
13 0.35 PK 1139 Ignition Voltage
14 0.5 PK 339 Ignition Voltage
15-17 - - Not Used
18 0.35 YE 5199 Ignition Voltage
19 0.35 D-GN/WH 1317 Fog Lamp Relay Control
20 0.35 TN 28 Horn Relay Control
21 0.35 OG 2268 Washer Fluid Pump Relay Control
22 0.35 GY 91 Wiper Relay Control
23-29 - - Not Used
30 0.35 WH 193 Rear Defog Relay Control
31 0.5 TN/WH 1969 Headlamp High Beam Relay Control
32-39 - - Not Used
40 3 RD/WH 1340 Battery Positive Voltage
41 3 RD/WH 1240 Battery Positive Voltage
42 5 PU 293 Rear Defog Element Supply Voltage
43-53 - - Not Used
54 0.35 OG 2267 Mirror Heating Element Supply Voltage
55-66 - - Not Used
67 0.5 RD/WH 1940 Battery Positive Voltage
68 0.5 RD/WH 2440 Battery Positive Voltage
69 0.8 RD/WH 3440 Battery Positive Voltage
70 3 RD/WH 3540 Battery Positive Voltage
71 1 RD/WH 5140 Battery Positive Voltage
72-74 - - Not Used
Connector Part Information 
  • Harness Type: Body Extension
  • OEM Connector: 13600393
  • Service Connector: 13576544
  • Description: 74-Way F DSQ 1.5 2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pin: 8
  • Terminated Lead: Pending
  • Release Tool: Not Available
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Service by Connector Assembly - 13600393
  • Core/Insulation Crimp: Not Available
  • Pins: 9-13, 18-22, 30, 54
  • Terminated Lead: 13575773
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: Pins: 9-13, 18-22, 30, 54 - Pending
  • Core/Insulation Crimp: Pins: 14, 31 - E/A
  • Pins: 40-42
  • 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: 67-69, 71
  • 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
  • Pin: 70
  • Terminated Lead: 13578867
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • 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 PK/BK 5291 Ignition Voltage
2 1 PK/BK 5292 Ignition Voltage
3 0.5 PK 2139 Ignition Voltage (MYB or MYC)
4 3 PU 6 Starter Solenoid Crank Voltage
5 1 OG 1470 Brake Booster Pump Motor Supply Voltage (LLT)
6 0.5 YE 5991 Powertrain Relay Control
7 0.5 D-GN 335 Low Speed Cooling Fan Relay Control
8 - - Not Used
9 0.8 PK/BK 5294 Ignition Voltage
10 - - Not Used
11 0.5 BN 7448 Vacuum Assist Pump Relay Coil Control (LLT)
12 0.5 PU/WH 6386 Starter Relay Control
13 0.5 BK/WH 451 Ground
14 0.5 PK 439 Ignition Voltage
15 - - Not Used
16 0.8 PK/BK 5293 Ignition Voltage
17-18 - - Not Used
19 0.8 PK/BK 5290 Ignition Voltage (L99 or LS3)
2 PK/BK 5290 Ignition Voltage (LLT)
20-26 - - Not Used
27 0.8 RD/WH 1840 Battery Positive Voltage (MYB or MYC)
28-35 - - Not Used
36 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control
37 - - Not Used
38 0.5 D-BU 473 High Speed Cooling Fan Relay Control
39-48 - - Not Used
49 0.5 D-GN 59 A/C Compressor Clutch Supply Voltage
50 0.5 PK 239 Ignition Voltage
X50A Fuse Block - Underhood X4

Pin Wire Circuit Function
A 19 RD 1 Battery Positive Voltage
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 13600407
  • Service Connector: 13505902
  • Description: 50-Way F 1.5/2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pins: 1-3, 27, 49, 50
  • 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
  • Pin: 4
  • Terminated Lead: 13578867
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: Not Available
  • Pins: 6, 7, 9, 12-14, 16, 19, 36, 38
  • Terminated Lead: Pins: 6, 7, 12-14, 36, 38 - 13575773
  • Terminated Lead: Pins: 9, 16, 19 - 13575774
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: E/A
Connector Part Information 
  • Terminal: 13595182
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Fig 7: X51A Fuse Block - Instrument Panel Label
GM2285696Courtesy of GENERAL MOTORS CORP.
X51A FUSE BLOCK - INSTRUMENT PANEL FUSE AND RELAY IDENTIFICATION LEGEND

No. Device Label Name Fuse And Relay Description Rating Circuits
F1 DLIS Fuse F1D Fuse 5 A S39 Ignition Switch
F2 DLC Fuse F2D Fuse 7.5 A X84 Data Link Connector
F3 AIRBAG Fuse F3D Fuse 10 A K36 Inflatable Restraint Sensing and Diagnostic Module
F4 CLSTR Fuse F4D Fuse 10 A P16 Instrument Cluster, and P26 Auxiliary Gauge Module (UMQ)
F5 HVAC Fuse F5D Fuse 15 A K33 HVAC Control Module
F6 BCM 2 Fuse F6D Fuse 20 A K9 Body Control Module
CB7 PASS SEAT Circuit Breaker CB7D Circuit Breaker 25 A S64P Seat Adjuster Switch - Passenger
F8 BAT Fuse F8D Fuse 30 A DISPLY/F13D, and ONSTAR/F14D Fuses
F9 SPARE Fuse F9D Fuse - Not Used
F10 SPARE Fuse F10D Fuse - Not Used
F11 EXP Fuse F11D Fuse 30 A Not Used
F12 SPARE Fuse F12D Fuse - Not Used
F13 DISPLY Fuse F13D Fuse 10 A T11 Multimedia Player Interface Module (USR), A20 Radio/HVAC Controls
F14 ONSTAR Fuse F14D Fuse 7.5 A K73 Telematics Communication Interface Control Module (UE1)
F15 BCM3 Fuse F15D Fuse 30 A K9 Body Control Module
F16 BCM4 Fuse F16D Fuse 30 A K9 Body Control Module
F17 PWR OUTLET Fuse F17D Fuse 20 A X80H Accessory Power Receptacle - Center Console
F18 PWR OUTLET Fuse F18D Fuse 20 A X80D Accessory Power Receptacle - Center Console Compartment
F19 SWC BKLT Fuse F19D Fuse 2 A S70L Steering Wheel Controls Switch - Left, and S70R Steering Wheel Controls Switch - Right (NZL)
F20 SPARE Fuse F20D Fuse - Not Used
F21 SPARE Fuse F21D Fuse - Not Used
F22 EXP Fuse F22D Fuse 30 A Not Used
F23 TRUNK Fuse F23D Fuse 10 A TRUNK RLY Relay K609
F24 AOS Fuse F24D Fuse 5 A K85 Passenger Presence Detection Module
F25 BCM 1 Fuse F25D Fuse 20 A K9 Body Control Module
CB26 DRVR SEAT Circuit Breaker CB26 Circuit Breaker 25 A S64D Seat Adjuster Switch - Driver
F27 BCM 8 Fuse F27D Fuse 30 A K9 Body Control Module
F28 SPARE Fuse F28D Fuse - -
F29 BCM5 Fuse F29D Fuse 25 A K9 Body Control Module
F30 BCM7 Fuse F30D Fuse 20 A K9 Body Control Module
K10 RAP RLY Relay K10 KR76 Retained Accessory Power Relay - PWR OUTLET/F17, and PWR OUTLET/F18 Fuses
K605 EXP RLY Relay K605 EXP RLY Relay K605 - Not Used
K609 TRUNK RLY Relay K609 KR95B Rear Compartment Lid release Relay - M40 Rear Compartment Lid Latch
Fig 8: X51A Fuse Block - Instrument Panel Top View
GM2285698Courtesy of GENERAL MOTORS CORP.
Fig 9: X51A Fuse Block - Instrument Panel Bottom View
GM2285701Courtesy of GENERAL MOTORS CORP.
X51A Fuse Block - Instrument Panel Wire Entry

Pin Wire Circuit Function
1 3 RD/WH 1440 Battery Positive Voltage
2 0.8 RD/WH 2240 Battery Positive Voltage
3 0.8 RD/WH 3340 Battery Positive Voltage
4 0.5 RD/WH 2840 Battery Positive Voltage
0.5 RD/WH 2840 Battery Positive Voltage (UMQ)
5 0.5 RD/WH 4440 Battery Positive Voltage
6 0.35 RD/WH 40 Battery Positive Voltage
7 0.5 RD/WH 540 Battery Positive Voltage
8-10 - - Not Used
11 2 RD/WH 2740 Battery Positive Voltage
12-14 - - Not Used
15 2 RD/WH 2540 Battery Positive Voltage
16 0.35 RD/WH 5340 Battery Positive Voltage
17 0.5 RD/WH 3240 Battery Positive Voltage
18 - - Not Used
19-24 - - Not Used
25 0.5 L-BU 6795 Rear Compartment Lid Release Control 2
26 0.35 TN 6188 Rear Compartment Lid Release Control
27 0.35 TN 755 RAP Relay Coil Control
28 2 RD/BK 1542 Battery Positive Voltage
29-30 - - Not Used
31 0.8 BK 1550 Ground
32 - - Not Used
33 0.5 RD/WH 3740 Battery Positive Voltage
34 1 D-GN 801 RAP 2 Fuse Supply Voltage
35 1 D-GN 1001 RAP 1 Fuse Supply Voltage
36 - - Not Used
37 0.35 YE 6817 LED Backlight Dimming Control
38 0.35 BN 6136 LED Backlight Dimming Control
39 0.8 BK 1550 Ground
40 1 RD/WH 2940 Battery Positive Voltage
41 0.8 RD/WH 3840 Battery Positive Voltage
42 - - Not Used
43 3 RD/WH 4040 Battery Positive Voltage
44 3 RD/WH 5040 Battery Positive Voltage
45 0.8 RD/WH 2140 Battery Positive Voltage
46 0.35 RD/WH 2040 Battery Positive Voltage
47 0.5 RD/WH 3740 Battery Positive Voltage
48 - - Not Used
X51A Fuse Block - Instrument Panel X1

Pin Wire Circuit Function
A 10 RD/BK 1542 Battery Positive Voltage
2 RD/BK 1542 Battery Positive Voltage
Connector Part Information 
  • Harness Type: Instrument Panel
  • OEM Connector: 13676641
  • Service Connector: See Catalog
  • Description: 48-Way F ASM CENT ELEC CTR I/P
Terminal Part Information 
  • Pin: 43
  • Terminal/Tray: 15410292/23
  • Core/Insulation Crimp: G/F/G/F
  • Release Tool: 15315247
  • Test Probe: J-35616-43 (RD)
  • Pins: 2, 3, 4, 5, 6, 7, 16, 17, 25, 26, 27, 31, 33, 37, 38, 39, 41, 45, 46, 47
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool: See Terminal Repair Kit
  • Test Probe: See Terminal Repair Kit
  • Pins: 1, 11, 15, 28, 34, 35, 40, 44
  • Terminal/Tray: 12191475/1
  • Core/Insulation Crimp: Pins: 1, 11, 15, 28 - A/G
  • Core/Insulation Crimp: Pins: 34, 35, 40 - 4/G
  • Release Tool: 12094429
  • Test Probe: J-35616-4A (PU)
Connector Part Information 
  • Terminal: 12146714
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Fig 10: X53A Fuse Block - Rear Body Label
GM2285707Courtesy of GENERAL MOTORS CORP.
X53A FUSE BLOCK - REAR BODY FUSE IDENTIFICATION LEGEND

No. Device Label Name Device Assigned Name Rating Description
F1 UGDO / URPA Fuse F1R Fuse 7.5 A S25 Garage Door Opener (UG1), K41 Parking Assist Control Module (UD7)
F2 AMP Fuse F2R Fuse 30 A T3 Audio Amplifier (UQA)
F3 RDO Fuse F3R Fuse 20 A A11 Radio
F4 SPARE 1 Fuse F4R Fuse - Not Used
F5 CONV / TOP1 Fuse F5R Fuse 30 A Not Used
F6 CONV / TOP2 Fuse F6R Fuse 10 A Not Used
F7 SPARE 3 Fuse F7R Fuse - Not Used
F8 SPARE 2 Fuse F8R Fuse - Not Used
F9 SPARE 7 Fuse F9R Fuse - Not Used
F10 SPARE 6 Fuse F10R Fuse - Not Used
F11 SPARE 5 Fuse F11R Fuse - Not Used
F12 SPARE 4 Fuse F12R Fuse - Not Used
F13 ECM BATT Fuse F13R Fuse 20 A K20 Engine Control Module
F14 RVC Fuse F14R Fuse 5 A K9 Body Control Module
F15 FSCM Fuse F15R Fuse 20 A K27 Fuel Pump Control Module
F16 SPARE 8 Fuse F16R Fuse - Not Used
Fig 11: X53A Fuse Block - Rear Body Top View
GM2285711Courtesy of GENERAL MOTORS CORP.
Fig 12: X53A Fuse Block - Rear Body Bottom View
GM2285718Courtesy of GENERAL MOTORS CORP.
X53A Fuse Block - Rear Body Wire Entry

Pin Wire Circuit Function
A1 - 1242 Battery Positive Voltage Bus
A2 0.5 RD/WH 3140 Battery Positive Voltage (UD7)
0.35 RD/WH 3140 Battery Positive Voltage
A3 - 1242 Battery Positive Voltage Bus
A4 3 RD/WH 3640 Battery Positive Voltage (UQA)
A5 5 RD/BK 1242 Battery Positive Voltage Bus
A6 1 RD/WH 340 Battery Positive Voltage
A7 - 1242 Battery Positive Voltage Bus
A8 - - Not Used
A9 - 1242 Battery Positive Voltage Bus
B1-B9 - - Not Used
C1-C9 - - Not Used
D1 - 1242 Battery Positive Voltage Bus
D2 0.8 RD/WH 440 Battery Positive Voltage
D3 - 1242 Battery Positive Voltage Bus
D4 0.35 RD/WH 2340 Battery Positive Voltage
D5 5 RD/BK 1242 Battery Positive Voltage Bus
D6 2 RD/WH 2640 Battery Positive Voltage
D7 - 1242 Battery Positive Voltage Bus
D8 - - Not Used
D9 - 1242 Battery Positive Voltage Bus
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 12160504
  • Service Connector: Pending
  • Description: 36-Way F Metri-Pack 280 Series, Flexlock (BK)
Terminal Part Information 
  • Pins: A2, A4, A6, D2, D4, D6
  • Terminated Lead: Pending
  • Release Tool: J-38125-553
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 12110652/4
  • Core/Insulation Crimp: Pins: A2, A4, D2, D4 - Not Available
  • Core/Insulation Crimp: Pin: A6 - F/D
  • Core/Insulation Crimp: Pin: D6 - A/B
  • Pins: A3, D3
  • Terminated Lead: Pending
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Not Available
Fig 13: X50D Fuse Block - Battery Top View
GM2285723Courtesy of GENERAL MOTORS CORP.
X50D Fuse Block - Battery X1

Pin Wire Circuit Function
1 50 RD 1 Battery Positive Voltage
X50D Fuse Block - Battery X2

Pin Wire Circuit Function
1 10 RD/BK 1542 Battery Positive Voltage
X50D Fuse Block - Battery X3

Pin Wire Circuit Function
1 8 RD/BK 1242 Battery Positive Voltage
Connector Part Information 
  • Terminal: 12015104
  • Core/Insulation Crimp: N/A
  • Description: Ring Terminal
Connector Part Information 
  • Harness Type: Body
  • Description: Ring Terminal
  • Terminated Lead: Not Available
  • Release Tool: Not Required
  • Diagnostic Test Probe: Not Required
  • Terminal/Tray: 13677128/Not Available
  • Core/Insulation Crimp: Not Available
Connector Part Information 
  • Harness Type: Body
  • Description: Ring Terminal
  • Terminated Lead: Not Available
  • Release Tool: Not Required
  • Diagnostic Test Probe: Not Required
  • Terminal/Tray: 12077720/Not Available
  • Core/Insulation Crimp: Not Available
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