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Electrical Center Identification Views

Fig 1: X50A Fuse Block - Underhood Label
GM2519100Courtesy of GENERAL MOTORS CORP.
X50A FUSE BLOCK - UNDERHOOD FUSE AND RELAY IDENTIFICATION LEGEND

No. Device Label Name Fuse And Relay Description Rating Circuits
Fuses 
1 ECM F1UA 15 A K20 Engine Control Module
2 EMIS F2UA 10 A B52A Heated Oxygen Sensor 1, B52B Heated Oxygen Sensor 2, B75B Mass Air Flow/Intake Air Temperature Sensor, E41 Engine Coolant Thermostat Heater, Q12 Evaporative Emission Purge Solenoid Valve
3 INJ F3UA 10 A Q17A Fuel Injector 1, Q17B Fuel Injector 2, Q17C Fuel Injector 3, Q17D Fuel Injector 4
4 IGN COIL F4UA 15 A K35 Ignition Coil Module
5 CLM F5UA 10 A Not Used
6a EMPTY - - Not Used
6b REAR DEFOG F6UA 10 A E18B Rear Defogger Grid - Lower
7 EMPTY F7UA - Not Used
8 EMPTY F8UA - Not Used
9 HTD MIR F9UA 10 A E17D Outside Rearview Mirror Glass - Driver, E17P Outside Rearview Mirror Glass - Passenger
10 ACCM F10UA 5 A G1A/C Compressor
11 TPIM F11UA 10 A T6 Power Inverter Module
12 CABIN PMP/VLV F12UA 15 A G36 Auxiliary Heater Coolant Pump, Q66 Passenger Compartment Heater Coolant Control Valve
13 EMPTY F13UA 7.5 A Not Used
14 PWR SNDR F14UA 10 A Not Used
15 TPIM/TCM F15UA 15 A K71 Transmission Control Module, T6 Power Inverter Module
16 AIR SOL F16UA 20 A Not Used
17 ECM F17UA 5 A K20 Engine Control Module
18 EMPTY F18UA - Not Used
19 FRT PWR WNDW F19UA 30 A M74D Window Motor - Driver, S79P Window Switch - Passenger
20 EMPTY F20UA - Not Used
21 ABS MDL F21UA 40 A K17 Electronic Brake Control Module
22 LT HI BEAM F22UA 5 A M28L High Beam Solenoid Actuator - Left
23 CHRG DR F23UA 20 A KR113 Charge Port Door Relay
24 EMPTY F24UA - Not Used
25 EMPTY F25UA - Not Used
26 THEFT DTRNT HORN F26UA 10 A Not Used
27 AIR PUMP F27UA 50 A Not Used
28 EMPTY F28UA - Not Used
29 EMPTY F29UA - Not Used
30 ABS MTR F30UA 60 A K17 Electronic Brake Control Module
31 RESS COOL PUMP F31UA 10 A G37 Hybrid Battery Pack Coolant Pump
32 AIRBAG F32UA 5 A K36 Inflatable Restraint Sensing and Diagnostic Module
33 CCM/VICM F33UA 5 A K27 Fuel Pump Control Module, K114B Hybrid Powertrain Control Module 2
34 VICM F34UA 10 A K114B Hybrid Powertrain Control Module 2
35 PWR-ELEC COOL PUMP F35UA 10 A G35 Hybrid Electronics Coolant Pump
36 EMPTY F36UA - Not Used
37 CHCM F37UA 5 A K10 Coolant Heater Control Module
38 EMPTY F38UA - Not Used
39 RESS F39UA 10 A A4 Hybrid Battery Pack, A28 Hybrid Battery Contactor Assembly, K16 Battery Energy Control Module
40 FRT WSW F40UA 10 A KR11 Windshield Washer Pump Relay
41 RT HI BEAM F41UA 5 A M28R High Beam Solenoid Actuator - Right
42 COOL FAN 2 F42UA 30 A G10R Cooling Fan Motor - Right
43 FRT WPR F43UA 25 A M75 Windshield Wiper Motor
44 CHRGR F44UA 40 A T18 Battery Charger
45 EMPTY F45UA - Not Used
46 EMPTY F46UA - Not Used
47 EMPTY F47UA - Not Used
48 COOL FAN 1 F48UA 30 A G10L Cooling Fan Motor - Left
49 EMPTY F49UA - Not Used
50 REAR CAMERA F50UA 10 A B87 Rearview Camera
51 ABS/RESS/CHRGR F51UA 5 A A4 Hybrid Battery Pack, K16 Battery Energy Control Module, K17 Electronic Brake Control Module, T18 Battery Charger
52 ECM/TCM F52UA 5 A K20 Engine Control Module, Q8 Control Solenoid Valve Assembly
53 TPIM F53UA 10 A T6 Power Inverter Module
54 MISC RUN/CRNK F54UA 5 A G1 A/C Compressor, K1 14V Power Module, P14 Passenger Air Bag Disable Indicator, P16 Instrument Cluster
Relays 
1 EMPTY - - Not Used
2 AIR SOL - - Not Used
3 PWR/TRN KR75 Powertrain Relay - F1UA, F2UA, F3UA, F4UA Fuses
4 REAR DEFOG KR4B Outside Rearview Mirror Heater Relay - F6UA, F9UA Fuses
5 CHARGE DR - - Not Used
6 EMPTY - - Not Used
7 EMPTY - - Not Used
8 EMPTY - - Not Used
9 AIR PUMP - - Not Used
10 EMPTY - - Not Used
11 EMPTY - - Not Used
12 EMPTY - - Not Used
13 EMPTY - - Not Used
14 RUN/CRANK KR74 Ignition Run Relay - F32UA, F33UA, F50UA, F51UA, F52UA, F53UA, F54UA Fuses
Important: Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block 
- - KR11 Windshield Washer Pump Relay - G24 Windshield Washer Pump
- - KR48 Headlamp High Beam Relay - F22UA, F41UA Fuses
Note: Items listed below are diagnostic testing points 
TP01 - - - -
TP02 - - - -
TP03 - - - -
TP04 - - - -
TP05 - - - -
TP06 - - - -
TP07 - - - -
TP08 - - - -
TP09 - - - -
TP10 - - - -
TP11 - - - -
Fig 2: X50A Fuse Block - Underhood Top View
GM2489509Courtesy of GENERAL MOTORS CORP.
Fig 3: X50A Fuse Block - Underhood Bottom View
GM2489511Courtesy of GENERAL MOTORS CORP.
GM2474672Courtesy of GENERAL MOTORS CORP.
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 13295572
  • Service Connector: 13355842
  • Description: 78-Way F (BK)
 Terminal Part Information 
  • Pins: 1-4, 6, 8, 10-12, 67, 72-74
  • Terminated Lead: 13295572
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 9, 18, 20-24, 28, 31, 35, 36, 48, 50, 59, 60, 76
  • Terminated Lead: 13578846
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
  • Pins: 75
  • Terminated Lead: 13578846
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 964280-2/15
  • Core/Insulation Crimp: E/2
X50A Fuse Block - Underhood X2

Pin Size Color Circuit Function Option
1 0.75 VT/GY 2339 Run/Crank Ignition 1 Voltage -
2 0.5 VT/WH 639 Run/Crank Ignition 1 Voltage -
0.5 VT/WH 639 Run/Crank Ignition 1 Voltage -
3 0.5 RD/L-BU 5240 Battery Positive Voltage -
4 0.75 RD/L-BU 3940 Battery Positive Voltage -
5 - - - Not Used -
6 0.5 RD/GY 2140 Battery Positive Voltage -
7 - - - Not Used -
8 0.5 RD/VT 1640 Battery Positive Voltage -
9 0.35 VT/GY 139 Run/Crank Ignition 1 Voltage -
0.5 VT/GY 139 Run/Crank Ignition 1 Voltage -
10 0.5 VT/L-GN 439 Run/Crank Ignition 1 Voltage -
11 0.75 WH/L-BU 3266 Child Security Lock Motor Unlock Control -
12 0.75 GY 295 Door Lock Actuator Lock Control -
13-17 - - - Not Used -
18 0.35 BN/VT 1969 Headlamp High Beam Relay Control -
19 - - - Not Used -
20 0.5 L-GN/VT 5199 Run/Crank Relay Coil Control -
21 0.5 RD/WH 2740 Battery Positive Voltage -
22 0.35 L-GN/GY 465 Fuel Pump Primary Relay Control -
23 0.35 YE/VT 3695 Charge Port Door Relay Control -
24 0.35 WH/L-BU 6311 Cruise/ETC/TCC Brake Signal -
25-27 - - - Not Used -
28 0.5 VT/L-GN 39 Run/Crank Ignition 1 Voltage -
29-30 - - - Not Used -
31 5 RD/BN 1742 Battery Positive Voltage -
32-34 - - - Not Used -
35 0.5 BN/GY 2268 Windshield Washer Relay Control -
36 0.35 VT/YE 3267 Child Security Lock Relay Control -
37-47 - - - Not Used -
48 2 RD/BN 3640 Battery Positive Voltage -
2.5 RD/BN 3640 Battery Positive Voltage -
49 - - - Not Used -
50 3 RD/WH 342 Battery Positive Voltage -
51-58 - - - Not Used -
59 0.35 RD/VT 1940 Battery Positive Voltage -
60 0.5 BN/VT 193 Rear Defog Relay Control -
61-66 - - - Not Used -
67 1 GY/L-GN 3271 Door Lock Control (2) -
68-71 - - - Not Used -
72 0.75 BN/VT 293 Rear Defog Element Supply Voltage -
73 1 BN/YE 2267 Mirror Heating Element Supply Voltage -
74 0.5 RD/WH 2740 Battery Positive Voltage -
75 0.35 RD/VT 1940 Battery Positive Voltage -
76 0.75 RD/WH 3440 Battery Positive Voltage -
0.75 RD/WH 3440 Battery Positive Voltage -
77-78 - - - Not Used -
GM2220560Courtesy of GENERAL MOTORS CORP.
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 13262029
  • Service Connector: 13505902
  • Description: 50-Way F DSQ 1.5 2.8 Metri-Pack 800 Series (BK)
 Terminal Part Information 
  • Pins: 1-3, 5, 47
  • 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: 4, 27
  • Terminated Lead: 13575541
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
  • Pins: 6, 8, 11, 12, 17, 20, 21, 33, 37, 41, 44
  • Terminated Lead: Pins 6, 8, 11, 12, 17, 20, 21, 33, 41, 44 - 13575538
  • Terminated Lead: Pins 37 - 13575539
  • Release Tool: J-38125-560
  • Diagnostic Test Probe: J-35616-14 (GN)
  • Terminal/Tray: 962943-5/16
  • Core/Insulation Crimp: E/A
  • Pins: 22
  • Terminated Lead: 13575718
  • Release Tool: J-38125-558
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
X50A Fuse Block - Underhood X3

Pin Size Color Circuit Function Option
1 0.75 VT/L-BU 5290 Powertrain Main Relay Fused Supply (1) -
2 0.75 VT/L-BU 5291 Powertrain Main Relay Fused Supply (2) -
3 1 VT/L-BU 5292 Powertrain Main Relay Fused Supply (3) -
4 0.5 VT/WH 239 Run/Crank Ignition 1 Voltage -
5 - - - Not Used -
6 0.5 VT/L-BU 5293 Powertrain Main Relay Fused Supply (4) -
7 - - - Not Used -
8 0.5 VT/L-GN 39 Run/Crank Ignition 1 Voltage -
9-16 - - - Not Used -
17 0.5 WH 5148 Engine Main Relay Control -
18-19 - - - Not Used -
20 0.5 VT/BK 339 Run/Crank Ignition 1 Voltage -
21-26 - - - Not Used -
27 0.5 RD/YE 240 Battery Positive Voltage -
28-32 - - - Not Used -
33 0.5 WH/L-BU 6311 Cruise/ETC/TCC Brake Signal -
34-36 - - - Not Used -
37 0.75 RD/BN 440 Battery Positive Voltage -
38-40 - - - Not Used -
41 0.5 RD/WH 2740 Battery Positive Voltage -
42-43 - - - Not Used -
44 0.5 RD/VT 1940 Battery Positive Voltage -
45-46 - - - Not Used -
47 0.5 L-GN/GY 465 Fuel Pump Primary Relay Control -
48-50 - - - Not Used -
GM2474740Courtesy of GENERAL MOTORS CORP.
Connector Part Information 
  • Harness Type: Forward Lamp
  • OEM Connector: ZF64-3
  • Service Connector: 13577511
  • Description: 64-Way F (BK)
 Terminal Part Information 
  • Pins: 4-6, 8, 58
  • Terminated Lead: 13580021
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-22 (RD)
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
  • Pins: 11, 13-16, 47, 53, 56
  • Terminated Lead: 13578846
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 48
  • Terminated Lead: 13580021
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: 4/A
X50A Fuse Block - Underhood X1

Pin Size Color Circuit Function Option
1-3 - - - Not Used -
4 3 RD/L-BU 540 Battery Positive Voltage -
5 2.5 RD/YE 3740 Battery Positive Voltage -
6 3 RD/WH 640 Battery Positive Voltage -
7 - - - Not Used -
8 3 RD/WH 140 Battery Positive Voltage -
9-10 - - - Not Used -
11 0.5 WH 311 Right Headlamp High Beam Supply Voltage -
12 - - - Not Used -
13 0.5 VT/GY 139 Run/Crank Ignition 1 Voltage -
14 0.5 GY/VT 228 Windshield Washer Pump Control -
15 0.5 VT/L-GN 439 Run/Crank Ignition 1 Voltage -
16 0.5 VT/L-GN 439 Run/Crank Ignition 1 Voltage -
17-46 - - - Not Used -
47 0.5 WH 711 Left Headlamp High Beam Supply Voltage -
48 2.5 BK 1950 Ground -
49-52 - - - Not Used -
53 0.75 RD/VT 3340 Battery Positive Voltage -
54-55 - - - Not Used -
56 0.5 L-BU/L-GN 6837 Siren #1 Supply -
57 - - - Not Used -
58 1 GY/L-GN 3696 Charge Port Door Actuator Supply Voltage -
59-64 - - - Not Used -
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 13605716
  • Service Connector: Pending
  • Description: RING D.5.4
 Terminal Part Information 
  • Terminated Lead: Pending
  • Release Tool: No Tool Reqd
  • Diagnostic Test Probe: No Tool Reqd
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
X50A Fuse Block - Underhood X4

Pin Size Color Circuit Function Option
A 6 RD/L-BU 42 Battery Positive Voltage -
8 RD/GY 142 Battery Positive Voltage -
8 RD/VT 102 Battery Positive Voltage -
Fig 4: X50B Fuse Block - Underhood Auxiliary Top View
GM2489512Courtesy of GENERAL MOTORS CORP.
X50B Fuse Block - Underhood Auxiliary Usage

No. Device Label Name Device Assigned Name Rating Description
- - F1UB 80 A Charging Provision
- - F2UB 80 A K43 Power Steering Control Module
Fig 5: X51L Fuse Block - Instrument Panel Left Label
GM2489526Courtesy of GENERAL MOTORS CORP.
X51L FUSE BLOCK - INSTRUMENT PANEL LEFT FUSE AND RELAY IDENTIFICATION LEGEND

No. Device Label Name Fuse And Relay Description Rating Circuits
Fuses 
F1 LTR F1DL 20 A E32 Cigarette Lighter Receptacle
F2 RDO F2DL 15 A A11 Radio
F3 CLSTR F3DL 10 A P16 Instrument Cluster
F4 DISPLY F4DL 10 A P17 Info Display Module
F5 HVAC F5DL 10 A A20 Radio/HVAC Controls, K33 HVAC Control Module
F6 AIRBAG F6DL 10 A K36 Inflatable Restraint Sensing and Diagnostic Module, K85 Passenger Presence Detection Module
F7 DLC1/DLC2 F7DL 15 A X84 Data Link Connector, X84B Auxiliary Data Link Connector
F8 Empty F8DL - Not Used
F9 Empty F9DL - Not Used
F10 BCM/EXT LIGHTS F10DL 15 A K9 Body Control Module
F11 LT HDLP F11DL 15 A K9 Body Control Module
F12 Empty F12DL - Not Used
F13 Empty F13DL - Not Used
F14 Empty F14DL - Not Used
F15 APO F115DL 20 A X80H Accessory Power Receptacle - Center Console
F16 Empty F16DL - Not Used
F17 Empty F17DL - Not Used
F18 Empty F18DL - Not Used
Diodes 
DIODE Empty - - Not Used
Relays 
R1 RAP RELAY KR76 Retained Accessory Power Relay - F1DL, F15DL Fuses
R2 Empty - - Not Used
R3 Empty - - Not Used
R4 Empty - - Not Used
Fig 6: X51L Fuse Block - Instrument Panel Left Top View
GM2489522Courtesy of GENERAL MOTORS CORP.
Fig 7: X51L Fuse Block - Instrument Panel Left
GM2489524Courtesy of GENERAL MOTORS CORP.
X51L Fuse Block - Instrument Panel Left (Wire Entry)

Pin Size Color Circuit Function Option
1 6 RD/L-BU 42 Battery Positive Voltage -
2-9 - - - Not Used -
10 1 VT 1701 Retained Accessory Power Fuse Supply Voltage -
1 VT 1701 Retained Accessory Power Fuse Supply Voltage -
11 1.5 RD/L-BU 842 Battery Positive Voltage -
12-17 - - - Not Used -
18 1.5 RD/L-BU 842 Battery Positive Voltage -
19 1 VT 1301 Retained Accessory Power Fuse Supply Voltage -
20 - - - Not Used -
21 1 RD/YE 5040 Battery Positive Voltage -
22 - - - Not Used -
23 0.5 RD/L-GN 502 Battery Positive Voltage -
24 - - - Not Used -
25 0.75 RD/VT 5140 Battery Positive Voltage -
26 - - - Not Used -
27 0.5 RD/L-GN 742 Battery Positive Voltage -
28 - - - Not Used -
29 0.5 RD/BK 2440 Battery Positive Voltage -
30 - - - Not Used -
31 0.5 RD/L-GN 1840 Battery Positive Voltage -
32-36 - - - Not Used -
37 0.75 RD/BN 4240 Battery Positive Voltage -
38 - - - Not Used -
39 2.5 RD/YE 4340 Battery Positive Voltage -
40 0.5 VT/YE 43 Accessory Voltage -
41 0.5 BK 1750 Ground -
42 2.5 RD/L-BU 842 Battery Positive Voltage -
Connector Part Information 
  • Harness Type: Instrument Panel
  • OEM Connector: 3B0S10200
  • Service Connector: 20971956
  • Description: PROD. HOUSING 212 x 41 x 49mm GM 58 Cavities (BK)
 Terminal Part Information 
  • Pins: 1, 10, 27, 29, 31, 39, 42
  • Terminated Lead: Pending
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
  • Pins: 11, 18, 19, 21
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 771416-HK200/7
  • Core/Insulation Crimp: A/D
  • Pins: 23, 25, 37, 40, 41
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 771816-HK200/7
  • Core/Insulation Crimp: C/A
Fig 8: X51R Fuse Block - Instrument Panel Right Label
GM2489519Courtesy of GENERAL MOTORS CORP.
X51R FUSE BLOCK - INSTRUMENT PANEL RIGHT FUSE IDENTIFICATION LEGEND

No. Device Label Name Device Assigned Name Rating Description
Fuses 
F1 SWC BKLT F1DR 2 A S70L Steering Wheel Controls Switch - Left, S70R Steering Wheel Controls Switch - Right
F2 AUX JACK F2DR 10 A Not Used
F3 Empty F3DR - Not Used
F4 RT HDLP F4DR 15 A K9 Body Control Module
F5 BCM / EXT LIGHTS F5DR 15 A K9 Body Control Module
F6 APO/EXT LIGHTS F6DR 15 A K9 Body Control Module
F7 INT LAMPS F7DR 15 A K9 Body Control Module
F8 TRN SIG / LCKS F8DR 15 A K9 Body Control Module
F9 LCKS F9DR 20 A K9 Body Control Module
F10 ONSTAR/UHP F10DR 10 A K73 Telematics Communication Interface Control Module
F11 UGDO F11DR 7.5 A S25 Garage Door Opener
F12 BLWR F12DR 30 A K8 Blower Control Module
F13 Empty F13DR - Not Used
F14 Empty F14DR - Not Used
F15 Empty F16DR - Not Used
F16 Empty F16DR - Not Used
F17 Empty F17DR - Not Used
F18 Empty F18DR - Not Used
Diodes 
DIODE Empty - - Not Used
Relays 
R1 Empty - - Not Used
R2 Empty - - Not Used
R3 Empty - - Not Used
R4 Empty - - Not Used
Fig 9: X51R Fuse Block - Instrument Panel Right Top View
GM2489528Courtesy of GENERAL MOTORS CORP.
Fig 10: X51R Fuse Block - Instrument Panel Right
GM2489524Courtesy of GENERAL MOTORS CORP.
X51R Fuse Block - Instrument Panel Right (Wire Entry)

Pin Size Color Circuit Function Option
1 8 RD/GY 142 Battery Positive Voltage -
2 4 RD/L-BU 840 Battery Positive Voltage -
3-17 - - - Not Used -
18 0.5 YE 6817 LED Backlight Dimming Control -
19 0.5 YE 6817 LED Backlight Dimming Control -
20-24 - - - Not Used -
25 0.75 RD/L-GN 4440 Battery Positive Voltage -
26 - - - Not Used -
27 0.75 RD/L-BU 4540 Battery Positive Voltage -
28 - - - Not Used -
29 0.75 RD/VT 4640 Battery Positive Voltage -
30 - - - Not Used -
31 0.75 RD/GY 4140 Battery Positive Voltage -
32 - - - Not Used -
33 0.75 RD/GY 4840 Battery Positive Voltage -
34 - - - Not Used -
35 1 RD/BN 4940 Battery Positive Voltage -
36 - - - Not Used -
37 0.5 RD/VT 2640 Battery Positive Voltage -
38 - - - Not Used -
39 0.35 RD/YE 740 Battery Positive Voltage -
Connector Part Information 
  • Harness Type: Instrument Panel
  • OEM Connector: 5B0X40307
  • Service Connector: 20971956
  • Description: GM EFLEX PDC IEC RH
 Terminal Part Information 
  • Pins: 1, 2, 39
  • Terminated Lead: Pending
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
  • Pins: 18, 19, 25, 27, 29, 31, 33, 37
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 771816-HK200/7
  • Core/Insulation Crimp: C/A
  • Pins: 35
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 771416-HK200/7
  • Core/Insulation Crimp: A/D
Fig 11: X50D Fuse Block - Battery Top View
GM2489514Courtesy of GENERAL MOTORS CORP.
X50D Fuse Block - Battery Usage

No. Device Label Name Device Assigned Name Rating Description
1 - F1RB 80 A X51L Fuse Block Instrument Panel - Left
2 - F2RB 80 A X51R Fuse Block Instrument Panel - Right
3 - F3RB 80 A X53A Fuse Block - Rear Body
4 - F4RB 100 A Not Used
- - F5RB 150 A X50B Fuse Block - Underhood Auxiliary
- - F6RB 200 A C1 Battery, F1RB, F2RB, F3RB, F4RB, F5RB Fuses
Fig 12: X53A Fuse Block - Rear Body Label
GM2489530Courtesy 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 
F1 Empty F1RA - Not Used
F2 FSCM F2RA 15 A K27 Fuel Pump Control Module
F3 PEPS F3RA 10 A K84 Keyless Entry Control Module
F4 HTD/SEAT F4RA 25 A K29 Heated Seating Contol Module
F5 Empty F5RA 20 A S52 Outside Rearview Mirror Switch, S79D Window Switch - Driver, S113 Charge Port Door Unlatch Switch, S117 Refuel Request Switch
F6 FUEL/ELCM F6RA 10 A Q13 Evaporative Emission Vent Solenoid Valve, Q63 Evaporative Emission System Leak Detection Pump Assembly
F7 APM FAN F7RA 15 A G38 14V Power Module Cooling Fan
F8 AMP F8RA 20 A T3 Audio Amplifier
F9 URPA F9RA 10 A Not Used
F10 RVC F10RA 5 A K9 Body Control Module, K41 Parking Assist Control Module
F11 HORN F11RA 15 A KR3 Horn Relay
F12 PWR WNDW F12RA 30 A S79LR Window Switch - Left Rear, S79RR Window Switch - Right Rear
F13 ELEC PRK/BRK F13RA 30 A K83 Parking Brake Control Module
F14 REAR DEFOG F14RA 40 A E18A Rea Defogger Grid - Upper
F15 Empty F16RA - Not Used
F16 L/GATE RELESE F16RA 10 A A23C Liftgate Latch Assembly
F17 Empty F17RA - Not Used
F18 Empty F18RA - Not Used
Diodes 
DIODE Empty - - Not Used
Relays 
R1 REAR DEFOG KR5 Rear Defogger Relay 40 A F14RA Fuse
R2 L/GATE RELESE KR95A Liftgate Release Relay 20 A F16RA Fuse
R3 Empty - 20 A Not Used
R4 Empty - 20 A Not Used
R5 Empty - - Not Used
R6 Empty - - Not Used
R7 Empty - - Not Used
R8 HORN KR3 Horn Relay - P12L Horn - Left, P12R Horn - Right
Fig 13: X53A Fuse Block - Rear Body Top View
GM2489531Courtesy of GENERAL MOTORS CORP.
Fig 14: X53A Fuse Block - Rear Body
GM2489532Courtesy of GENERAL MOTORS CORP.
X53A Fuse Block - Rear Body (Wire Entry)

Pin Size Color Circuit Function Option
1 0.35 BK 1450 Ground -
2 2 RD/L-BU 2540 Battery Positive Voltage -
3 2.5 BN/GY 29 Horn Control -
4 0.35 BN/WH 28 Horn Relay Control -
5-19 - - - Not Used -
1 8 RD/VT 102 Battery Positive Voltage -
2 2 RD/YE 3740 Battery Positive Voltage -
2 RD/YE 3740 Battery Positive Voltage -
3 - - - Not Used -
4 3 RD/L-BU 1842 Battery Positive Voltage -
5 - - - Not Used -
6 4 BN/VT 293 Rear Defog Element Supply Voltage -
7 4 BN/VT 293 Rear Defog Element Supply Voltage -
8-11 - - - Not Used -
12 0.75 L-BU/WH 6128 Rear Closure Unlatch Motor Unlatch Control -
13 0.75 L-BU/WH 6128 Rear Closure Unlatch Motor Unlatch Control -
14-20 - - - Not Used -
21 1 RD/L-GN 1540 Battery Positive Voltage -
22 - - - Not Used -
23 0.35 RD/WH 4042 Battery Positive Voltage -
0.5 RD/WH 4042 Battery Positive Voltage -
24 - - - Not Used -
25 1 RD/GY 1740 Battery Positive Voltage -
26 - - - Not Used -
27 0.35 RD/WH 4740 Battery Positive Voltage -
28 - - - Not Used -
29 0.5 RD/WH 1340 Battery Positive Voltage -
30 - - - Not Used -
31 0.5 RD/BN 2240 Battery Positive Voltage -
32 - - - Not Used -
33 2.5 RD/BN 1140 Battery Positive Voltage -
34-36 - - - Not Used -
37 0.5 RD/GY 2840 Battery Positive Voltage -
0.5 RD/GY 2840 Battery Positive Voltage -
38 - - - Not Used -
39 2 RD/L-BU 2540 Battery Positive Voltage -
40 0.5 BK 650 Ground -
41 0.5 BN/VT 193 Rear Defog Relay Control -
42 4 BN/VT 293 Rear Defog Element Supply Voltage -
43 - - - Not Used -
44 0.5 L-GN/BN 5706 Endgate Latch Relay Supply Voltage -
45 0.75 L-BU/WH 6128 Rear Closure Unlatch Motor Unlatch Control -
46-47 - - - Not Used -
48 0.5 BK 650 Ground -
49-58 - - - Not Used -
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 3B0S70200
  • Service Connector: 20971956
  • Description: PROD. CASSETTE HSG
 Terminal Part Information 
  • Pins: 1, 4
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 772216-HK200/25
  • Core/Insulation Crimp: E/C
  • Pins: 2, 21, 25, 39
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 771416-HK200/7
  • Core/Insulation Crimp: A/D
  • Pins: 1-4, 6, 7, 23, 27, 33, 42
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
  • Pins: 12, 13, 29, 31, 37, 40, 41, 44, 45, 48
  • Terminated Lead: Pending
  • Release Tool: J-38125-11A
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 771816-HK200/7
  • Core/Insulation Crimp: C/A
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