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Electrical Center Identification Views

Fig 1: X50A Fuse Block - Underhood - Top View
GM2449757Courtesy of GENERAL MOTORS CORP.
Fig 2: X50A Fuse Block - Underhood - Bottom View
GM2449763Courtesy of GENERAL MOTORS CORP.
Fig 3: X50A Fuse Block - Underhood - Label
GM2449767Courtesy 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 1 F1UA Fuse 15 A K71 Transmission Control Module (MDK), Q8 Control Solenoid Valve Assembly (MH7)
2 2 F2UA Fuse 15 A K20 Engine Control Module
3 3 F3UA Fuse - Not Used
4 4 F4UA Fuse - Not Used
5 5 F5UA Fuse 15 A K20 Engine Control Module, K71 Transmission Control Module (MDK)
6 6 F6UA Fuse 30 A KR12B Windshield Wiper Relay, KR12C Windshield Wiper Speed Control Relay
7 7 F7UA Fuse - Not Used
8 8 F8UA Fuse 15 A Not Used
9 9 F9UA Fuse 15 A K20 Engine Control Module (LAF), T8A Ignition Coil 1, T8B Ignition Coil 2, T8C Ignition Coil 3, T8D Ignition Coil 4
10 10 F10UA Fuse 20 A K20 Engine Control Module
11 11 F11UA Fuse 10 A Q12 Evaporative Emission Purge Solenoid Valve (LHU), B52A Heated Oxygen Sensor 1 (LHU), B52B Heated Oxygen Sensor 2 (LHU), Q40 Turbocharger Bypass Solenoid Valve (LHU), Q42 Turbocharger Wastegate Solenoid Valve (LHU)
12 12 F12UA Fuse 30 A KR27 Starter Relay
13 13 F13UA Fuse 7.5 A Q8 Control Solenoid Valve Assembly (MH7)
14 14 F14UA Fuse 15 A Not Used
15 15 F15UA Fuse - Not Used
16 16 F16UA Fuse 7.5 A B19C Brake Booster Vacuum Switch, K18 Compass Module (Connector)
17 17 F17UA Fuse 5 A K36 Inflatable Restraint Sensing and Diagnostic Module
18 18 F18UA Fuse - Not Used
19 19 F19UA Fuse - Not Used
20 20 F20UA Fuse - Not Used
21 21 F21UA Fuse 30 A S79LR Window Switch - Left Rear, S79RR Window Switch - Right Rear
22 22 F22UA Fuse 30 A K17 Electronic Brake Control Module
23 23 F23UA Fuse 10 A K43 Power Steering Control Module (NXC)
24 24 F24UA Fuse 30 A M74D Window Motor - Driver, M74P Window Motor - Passenger
25 25 F25UA Fuse 30 A T1 Accessory DC/AC Power Inverter Module (KI6)
26 26 F26UA Fuse 60 A K17 Electronic Brake Control Module
27 27 F27UA Fuse 30 A K83 Parking Brake Control Module
28 28 F28UA Fuse 40 A R14L Rear Window Defogger Noise Filter - Left
29 29 F29UA Fuse 15 A S65D Seat Lumbar Supprot Switch - Driver
30 30 F30UA Fuse 15 A S65P Seat Lumbar Supprot Switch - Passenger (APH)
31 31 F31UA Fuse 10 A Not Used
32 32 F32UA Fuse 20 A K9 Body Control Module
33 33 F33UA Fuse 25 A K29 Seat Heating Control Module
34 34 F34UA Fuse 25 A M69 Sunroof Motor (CF5)
35 35 F35UA Fuse 30 A T3 Audio Amplifier (UQA)
36 36 F36UA Fuse - Not Used
37 37 F37UA Fuse 10 A E4F Headlamp - Right High Beam (TT4), M28R High Beam Solenoid Actuator - Right (TT6)
38 38 F38UA Fuse 10 A E4E Headlamp - Left High Beam (TT4), M28L High Beam Solenoid Actuator - Left (TT6)
39 39 F39UA Fuse - Not Used
40 40 F40UA Fuse - Not Used
41 41 F41UA Fuse 30 A KR14 Brake Booster Pump Motor Relay (LAF)
42 42 F42UA Fuse 30 A KR20K Cooling Fan Right High Speed Relay
43 43 F43UA Fuse 60 A Not Used
44 44 F44UA Fuse - Not Used
45 45 F45UA Fuse 30 A KR20C Cooling Fan Low Speed Relay
46 46 F46UA Fuse 10 A KR20C Cooling Fan Low Speed Relay, KR20J Relay Cooling Fan Left High Speed Relay
47 47 F47UA Fuse 10 A B52A Heated Oxygen Sensor 1 (LAF), B52B Heated Oxygen Sensor 2 (LAF), B75B Mass Air Flow/Intake Air Tremperature Sensor (LAF), Q12 Evaporative Emission Purge Solenoid Valve (LAF)
48 48 F48UA Fuse 15 A E29LF Fog Lamp - Left Front, E29RF Fog Lamp - Right Front
49 49 F49UA Fuse 15 A T7R Headlamp Ballast - Right (TT6)
50 50 F50UA Fuse 15 A T7L Headlamp Ballast - Left (TT6)
51 51 F51UA Fuse 15 A P13 Horn Assembly
52 52 F52UA Fuse 5 A P16 Instrument Cluster
53 53 F53UA Fuse 10 A A10 Inside Rearview Mirror
54 54 F54UA Fuse 5 A Not Used
55 55 F55UA Fuse 7.5 A S79D Window Switch - Driver, S52 Outside Rearview Mirror Switch
56 56 F56UA Fuse 15 A G24 Windshield Washer Pump
57 57 F57UA Fuse - Not Used
58 58 F58UA Fuse - Not Used
59 59 F59UA Fuse 15 A Not Used
60 60 F60UA Fuse 7.5 A E17D Outside Rearview Mirror Glass - Driver, E17P Outside Rearview Mirror Glass - Passenger
61 61 F61UA Fuse - Not Used
62 62 F62UA Fuse 10 A Q13 Evaporative Emission Vent Solenoid Valve
63 63 F63UA Fuse - Not Used
64 64 F64UA Fuse - Not Used
65 65 F65UA Fuse - Not Used
66 66 F66UA Fuse - Not Used
67 67 F67UA Fuse 20 A K27 Fuel Pump Control Module
68 68 F68UA Fuse - Not Used
69 69 F69UA Fuse 5 A K9 Body Control Module
70 70 F70UA Fuse 5 A Not Used
71 71 F71UA Fuse 5 A Not Used
Relays 
1 1 - - Not Used
2 2 KR27 Starter Relay - M64 Starter Motor
3 3 - - Not Used
4 4 KR12C Windshield Wiper Speed Control Relay - M75 Windshield Wiper Motor
5 5 KR12B Windshield Wiper Relay - M75 Windshield Wiper Motor
6 6 - - Not Used
7 7 KR71 Engine Control Module Relay - -
8 8 - - Not Used
9 9 KR20K Cooling Fan Right High Speed Relay - G10R Cooling Fan Motor - Right
10 10 KR20C Cooling Fan Low Speed Relay - G10L Cooling Fan Motor - Left, G10R Cooling Fan Motor - Right
11 11 - - Not Used
12 12 - - Not Used
13 13 KR20 J Cooling Fan Left High Speed Relay - G10L Cooling Fan Motor - Left
14 14 KR49 Headlamp Low Beam Relay - F49UA (TT6), F50UA (TT6)
15 15 KR74 Ignition Run Relay - F5UA, F13UA, F16UA, F17UA, F18UA, F52UA, F53UA, F54UA, F57UA
16 16 - - Not Used
17 17 KR5 Rear Defogger Relay - E17D Outside Rearview Mirror Glass - Driver, E17P Outside Rearview Mirror Glass - Passenger, R14L Rear Window Defogger Noise Filter - Left
Important: 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
- - KR48 Headlamp High Beam Relay - F37UA, F38UA Fuses
- - KR97 Door Lock Relay - A23D Door Latch Assembly - Driver, A23LR Door Latch Assembly - Left Rear, A23P Door Latch Assembly - Passenger, A23RR Door Latch Assembly - Right Rear
Note: Items listed below are diagnostic testing points 
TP18 - - - Not Used
TP19 - - - Not Used
TP24 - - - Not Used
TP26 - - - Not Used
Fig 4: X50A Fuse Block - Underhood X1
GM2174006Courtesy of GENERAL MOTORS CORP.
X50A Fuse Block - Underhood X1

Pin Wire Circuit Function
1-10 - - Not Used
11 1 BN/GY 29 Horn Control
12 - - Not Used
13 1.5 WH 311 Right Headlamp High Beam Supply Voltage
14 1.5 WH 711 Left Headlamp High Beam Supply Voltage
15-19 - - Not Used
20 0.75 RD/D-BU 5290 Powertrain Main Relay Fused Supply (1)
21-29 - - Not Used
30 1 D-BU/RD 228 Windshield Washer Pump Control
31 1.5 BN/VT 2234 Front Fog Lamp Supply Voltage
32-36 - - Not Used
37 4 RD/L-GN 1040 Battery Positive Voltage
38 2.5 RD/VT 1940 Battery Positive Voltage
39-40 - - Not Used
41 4 BK 1350 Ground
42 - - Not Used
43 4 RD/GN 1040 Battery Positive Voltage
44 - - Not Used
45 4 RD/WH 532 Cooling Fan Motor Supply Voltage (2)
46 4 RD/WH 532 Cooling Fan Motor Supply Voltage (2)
47 4 RD/YE 409 Cooling Fan Motor Supply Voltage (1)
48-49 - - Not Used
50 4 BK/L-GN 504 Cooling Fan Motor Return
51 - - Not Used
52 0.75 D-GN/VT 335 Low Speed Cooling Fan Relay Control
53 0.5 BN/RD 2700 5 Volt Reference
54 - - Not Used
55 0.5 BK/BN 5514 Low Reference
56 - - Not Used
57 0.5 D-GN 380 A/C Refrigerant Pressure Sensor Signal
58-63 - - Not Used
64 0.75 D-GN/VT 335 Low Speed Cooling Fan Relay Control
65 0.5 VT/GY 2839 Run/Crank Ignition 1 Voltage
66-67 - - Not Used
68 0.75 RD/D-BU 5290 Powertrain Main Relay Fused Supply (1)
69-70 - - Not Used
71 2.5 BK 1350 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 2.5 BK 1350 Ground
75-82 - - Not Used
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 13262028
  • Service Connector: 13316113
  • Description: 82-Way F DSQ 1.5 2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pins: 13, 14, 31, 71-74
  • Terminated Lead: Pending
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
  • Pins: 11, 20, 30, 52, 53, 55, 57, 64, 68
  • 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: 37, 38, 41, 43, 45-47, 50
  • Terminated Lead: Pending
  • Release Tool: 12150860
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
Fig 5: X50A Fuse Block - Underhood X2
GM2174004Courtesy of GENERAL MOTORS CORP.
X50A Fuse Block - Underhood X2

Pin Wire Color Circuit No. Function
1-13 - - Not Used
14 0.5 VT/BN 2939 Run/Crank Ignition 1 Voltage
15-16 - - Not Used
17 0.5 OG/BK 1594 Ignition 3 Relay Control
18 - - Not Used
19 0.5 BN/WH 1317 Fog Lamp Relay Control
20-21 - - Not Used
22 0.5 GY 91 Windshield Wiper Motor Relay Coil Supply Voltage
23 0.5 RD/BU 442 Battery Positive Voltage
24 - - Not Used
25 0.5 BN/WH 28 Horn Relay Control
26 0.5 VT/YE 1139 Run/Crank Ignition 1 Voltage
27 0.75 RD 240 Battery Positive Voltage (NXC)
28 0.5 RD/YE 2840 Battery Positive Voltage
29-30 - - Not Used
31 0.75 VT/GN 39 Run/Crank Ignition 1 Voltage
32 - - Not Used
33 4 RD/GN 2940 Battery Positive Voltage
34 2.5 RD/GN 1542 Battery Positive Voltage
35 - - Not Used
36 4 RD/YE 1540 Battery Positive Voltage
37-38 - - Not Used
39 4 BN/VT 293 Rear Defog Element Supply Voltage
40 2.5 RD/BU 1340 Battery Positive Voltage
41 6 RD/BU 1640 Battery Positive Voltage
42 4 RD/GN 1040 Battery Positive Voltage
43 - - Not Used
44 1 RD/BU 1640 Battery Positive Voltage
45 0.5 WH/VT 860 Front Windshield Wiper Switch High Signal
46-55 - - Not Used
56 1 RD/BU 1640 Battery Positive Voltage
57 - - Not Used
58 0.5 BN/VT 1969 Headlamp High Beam Relay Control
59 - - Not Used
60 0.5 BN/GY 2268 Windshield Washer Relay Control
61 0.5 BN/VT 193 Rear Defog Relay Control
62 0.75 BN/YE 2267 Mirror Heating Element Supply Voltage
63-67 - - Not Used
68 2.5 GN/GY 9 Park Lamp Supply Voltage
69 2.5 RD/WH 2040 Battery Positive Voltage
70 2.5 RD/WH 742 Battery Positive Voltage
71 2.5 RD/VT 3740 Battery Positive Voltage
72 0.5 RD/GY 1442 Battery Positive Voltage
73 0.75 BU 5372 Canister Valve Solenoid
74 2.5 RD/WH 1740 Battery Positive Voltage
Connector Part Information 
  • Harness Type: Body
  • OEM Connector: 13262027
  • Service Connector: 13316161
  • Description: 74-Way F DSQ 1.5 2.8 Metri-Pack 800 Series (BK)
Terminal Part Information 
  • Pins: 14, 17, 19, 22, 23, 25, 26, 28, 31, 44, 45, 56, 58, 60-62, 72, 73
  • Terminated Lead: Pending
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 33, 34, 36, 39, 40, 42
  • Terminated Lead: Pending
  • Release Tool: 12150860
  • Diagnostic Test Probe: J-35616-44 (YE)
  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
  • Pins: 41, 68-71, 74
  • Terminated Lead: Pending
  • Release Tool: Pending
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Pending
  • Core/Insulation Crimp: Pending
Fig 6: X50A Fuse Block - Underhood X3
GM2220560Courtesy of GENERAL MOTORS CORP.
X50A Fuse Block - Underhood X3

Pin Wire Circuit Function
1 2 PK/BK 5290 Powertrain Main Relay Fused Supply (1) (LAF)
2.5 PK/BK 5290 Powertrain Main Relay Fused Supply (1) (LHU)
2 0.8 PK/BK 5291 Powertrain Main Relay Fused Supply (2) (LAF)
2.5 PK/BK 5292 Powertrain Main Relay Fused Supply (3) (LHU)
3 - - Not Used
4 0.5 PK 2139 Run/Crank Ignition 1 Voltage (LAF)
0.5 PK 2139 Run/Crank Ignition 1 Voltage (LAF)
0.5 BK 39 Run/Crank Ignition 1 Voltage (LHU)
5 3 PU 6 Starter Solenoid Crank Voltage (LAF)
2.5 YE 6 Starter Solenoid Crank Voltage (LHU)
6 0.8 PK/BK 5293 Powertrain Main Relay Fused Supply (4) (LAF)
7 1.5 PK/BK 5293 Powertrain Main Relay Fused Supply (4) (LHU)
8 0.5 PK/BK 5294 Powertrain Main Relay Fused Supply (5) (LHU)
9-10 - - Not Used
11 0.5 PU/WH 6386 Starter Enable Relay (PPEI 3) Control
12-14 - - Not Used
15 0.5 D-BU 473 High Speed Cooling Fan Relay Control
16 - - Not Used
17 0.5 YE 5991 Powertrain Relay Coil Control
18 0.5 D-GN 335 Low Speed Cooling Fan Relay Control (LAF)
19 - - Not Used
20 0.5 PK 439 Run/Crank Ignition 1 Voltage (LAF)
0.5 PK 139 Run/Crank Ignition 1 Voltage (LHU)
21 1 BK 2650 Ground (LAF)
0.5 BK 150 Ground (LHU)
22-26 - - Not Used
27 0.8 RD/WH 440 Battery Positive Voltage (LAF)
0.5 RD/WH 140 Battery Positive Voltage (LHU)
28-31 - - Not Used
32 0.5 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
33 - - Not Used
34 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control (LHU)
35-36 - - Not Used
37 1 RD/WH 1840 Battery Positive Voltage (MH7)
1.5 RD 40 Battery Positive Voltage (MDK)
38 0.5 GY 2700 5 Volt Reference
39 0.5 TN 5514 Low Reference
40-45 - - Not Used
46 0.5 D-BU 473 High Speed Cooling Fan Relay Control
0.5 D-BU 473 High Speed Cooling Fan Relay Control (LAF)
47-48 - - Not Used
49 0.5 D-GN 335 Low Speed Cooling Fan Relay Control
0.5 D-GN 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 
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 1 F1UB Fuse 100A X51A Fuse Block - Instrument Panel
2 2 F2UB Fuse 100A X51A Fuse Block - Instrument Panel
3 3 F3UB Fuse 100A Not Used
4 4 F4UB Fuse 100A Not Used
5 - F5UB Fuse 250A X50A Fuse Block - Underhood
6 - F6UB Fuse 300A M64 Starter Motor, G13 Generator
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 RD 2 Battery Positive Voltage (LAF)
1 25 RD 2 Battery Positive Voltage (LHU)
X50D Fuse Block - Battery X4

Pin Wire Circuit Function
1 10.0 RD/BK 42 Battery Positive Voltage
X50D Fuse Block - Battery X5

Pin Wire Circuit Function
2 10.0 RD/D-BU 1642 Battery Positive Voltage
Terminal Part Information 
  • Harness: Battery (+)
  • Terminal: 15327720
  • Core/Insulation Crimp: Not Available
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Fuse Block - Underhood
  • Terminal: 13535874
  • Core/Insulation Crimp: Not Available
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Starter - Generator
  • Terminal: 10730988 (LAF)
  • Terminal: 13303048 (LHU)
  • Core/Insulation Crimp: Not Available
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Body
  • Terminal: 13262039
  • Core/Insulation Crimp: Not Available
  • Description: Ring Terminal
Terminal Part Information 
  • Harness: Body
  • Terminal: 13262040
  • Core/Insulation Crimp: Not Available
  • Description: Ring Terminal
Fig 8: X70A Relay Block - Underhood Top View
GM2462097Courtesy of GENERAL MOTORS CORP.
X70A RELAY BLOCK - UNDERHOOD RELAY IDENTIFICATION LEGEND

No. Device Label Name Relay Description Rating Circuits
1 - KR20G Cooling Fan Left Low Speed Relay - G10L Cooling Fan Motor - Left, G10R Cooling Fan Motor - Right
2 - KR20H Cooling Fan Right Low Speed Relay - G10R Cooling Fan Motor - Right
3 - KR20L Cooling Fan Speed Control 2 Relay - G10L Cooling Fan Motor - Left, G10R Cooling Fan Motor - Right
Fig 9: KR20G Cooling Fan Left Low Speed Relay
GM2180205Courtesy of GENERAL MOTORS CORP.
KR20G Cooling Fan Left Low Speed Relay

Pin Wire Circuit Function
1 - - Not Used
2 6 RD/WH 1040 Battery Positive Voltage
3 - - Not Used
4 0.75 VT/BU 5290 Powertrain Main Relay Fused Supply (1)
5 - - Not Used
6 0.75 BN/YE 5128 Cooling Fan Relay Coil Control
7 - - Not Used
8 6 WH/BU 409 cooling Fan Motor Supply Voltage (1)
9 - - Not Used
Connector Part Information 
  • Harness Type: Cooling Fan
  • OEM Connector: 90491221
  • Service Connector: Service by Harness - See Part Catalog
  • Description: 9-Way F Metri-Pack 280/630 Series (RD)
Terminal Part Information 
  • Terminated Lead: Service by Harness - See Part Catalog
  • Release Tool: Not Available
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Service by Harness - See Part Catalog
  • Core/Insulation Crimp: Not Available
Fig 10: KR20H Cooling Fan Right Low Speed Relay
GM2180205Courtesy of GENERAL MOTORS CORP.
KR20H Cooling Fan Right Low Speed Relay

Pin Wire Circuit Function
1 - - Not Used
2 6 RD/WH 1040 Battery Positive Voltage
3 - - Not Used
4 0.75 VT/BU 5290 Powertrain Main Relay Fused Supply (1)
5 - - Not Used
6 0.75 BN/YE 5128 Cooling Fan Relay Coil Control
7 - - Not Used
8 6 GY 532 Cooling Fan Motor Supply Voltage (2)
9 - - Not Used
Connector Part Information 
  • Harness Type: Cooling Fan
  • OEM Connector: 90356384
  • Service Connector: Service by Harness - See Part Catalog
  • Description: 9-Way F Metri-Pack 280/630 Series (BK)
Terminal Part Information 
  • Terminated Lead: Service by Harness - See Part Catalog
  • Release Tool: Not Available
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Service by Harness - See Part Catalog
  • Core/Insulation Crimp: Not Available
Fig 11: KR20L Cooling Fan Speed Control 2 Relay
GM2180204Courtesy of GENERAL MOTORS CORP.
KR20L Cooling Fan Speed Control 2 Relay

Pin Wire Circuit Function
1 - - Not Used
2 6 GN/BK 504 Cooling Fan Motor Return
3 - - Not Used
4 0.75 VT/BU 5290 Powertrain Main Relay Fused Supply (1)
5 6 GY 532 Cooling Fan Motor Supply Voltage (2)
6 0.75 BN/YE 5128 Cooling Fan Relay Coil Control
7 - - Not Used
8 6 BK 1250 Ground
9 - - Not Used
Connector Part Information 
  • Harness Type: Cooling Fan
  • OEM Connector: 90491230
  • Service Connector: Service by Harness - See Part Catalog
  • Description: 9-Way F Metri-Pack 280/630 Series (BN)
Terminal Part Information 
  • Terminated Lead: Service by Harness - See Part Catalog
  • Release Tool: Not Available
  • Diagnostic Test Probe: Pending
  • Terminal/Tray: Service by Harness - See Part Catalog
  • Core/Insulation Crimp: Not Available
Fig 12: X51A Fuse Block - Instrument Panel - Top View Fuses
GM2439345Courtesy of GENERAL MOTORS CORP.
X51A FUSE BLOCK - INSTRUMENT PANEL - FUSE IDENTIFICATION LEGEND

No. Device Name Device Assigned Name Rating Description
1 1 F1DA Fuse 10 A K19 Suspension Control Module (F45)
2 2 F2DA Fuse 20 A K9 Body Control Module
3 3 F3DA Fuse 25 A K9 Body Control Module
4 4 F4DA Fuse 20 A A11 Radio
5 5 F5DA Fuse 10 A A22 Radio Controls, P17 Info Display Module, S56 Radio Multifunction Switch (KRJ), T11 Multimedia Player Interface Module (KTA)
6 6 F6DA Fuse 20 A X80G Accessory Power Receptacle - Instrument Panel
7 7 F7DA Fuse 20 A X80H Accessory Power Receptacle - Center Console
8 8 F8DA Fuse 30 A K9 Body Control Module
9 9 F9DA Fuse 30 A K9 Body Control Module
10 10 F10DA Fuse 30 A K9 Body Control Module
11 11 F11DA Fuse 40 A K8 Blower Control Module
12 12 F12DA Cicuit Breaker 25 A S64P Seat Adjuster Switch - Passenger
13 13 F13DA Circuit Breaker 25 A S64D Seat Adjuster Switch - Driver
14 14 F14DA Fuse 7.5 A X84 Data Link Connector
15 15 F15DA Fuse 10 A K36 Inflatable Restraint Sensing and Diagnostic Module
16 16 F16DA Fuse 10 A KR95B Rear Compartment Lid Release Relay
17 17 F17DA Fuse 10 A A26 HVAC Controls, K33 HVAC Control Module
18 18 F18DA Fuse - (Diagnostic Provision)
19 19 F19DA Fuse - Not Used
20 20 F20DA Fuse 5 A K85 Passenger Presence Detection Module
21 21 F21DA Fuse 10 A P16 Instrument Cluster
22 22 F22DA Fuse 2 A S39 Ignition Switch
23 23 F23DA Fuse 20 A K9 Body Control Module
24 24 F24DA Fuse 20 A K9 Body Control Module
25 25 F25DA Fuse 5 A K73 Telematics Communication Interface Control Module
26 26 F26DA Fuse - Not Used
Fig 13: X51A Fuse Block - Instrument Panel - Top View Relays
GM2355276Courtesy of GENERAL MOTORS CORP.
X51A FUSE BLOCK - INSTRUMENT PANEL - RELAY IDENTIFICATION LEGEND

No. Device Label Name Relay Description Rating Circuits
1 - KR95B Rear Compartment Lid Release Relay (RUE) - M40 Rear Compartment Lid Latch (RUE)
2 - KR104A Battery Saver Relay 1 - F1DA, F4DA, F5DA Fuses
3 - KR76 Retained Accessory Power Relay - F6DA, F7DA Fuses
KR113 Child Security Lock Disable Relay (OSH) - A23 LR Door Latch Assembly-Left Rear (OSH)
A23 RR Door Latch Assembly-Right Rear (OSH)
Fig 14: X51A Fuse Block - Instrument Panel - Bottom View Fuses
GM2405334Courtesy of GENERAL MOTORS CORP.
X51A Fuse Block - Instrument Panel - Bottom View Fuses (Wire Entry)

Pin Wire Color Circuit No. Function
16 2.5 RD/VT 3140 Battery Positive Voltage
17 0.75 RD/L-GN 1040 Battery Positive Voltage (F45)
18 2.5 RD/L-GN 40 Battery Positive Voltage
19 6 RD/VT 3140 Battery Positive Voltage
20 0.5 RD/VT 102 Battery Positive Voltage
21 1.5 GY/VT 691 Headlamp Low Beam Relay Control
22 2.5 RD/VT 3140 Battery Positive Voltage
23 2.5 BN/YE 43 Accessory Voltage
24 2.5 BN/YE 43 Accessory Voltage
25 0.75 RD/YE 2 Battery Positive Voltage
26 2.5 GY 975 Battery Positive Voltage
27 2.5 RD/VT 3140 Battery Positive Voltage
28 0.75 RD/VT 3140 Battery Positive Voltage
29 2.5 VT/RD 801 Retained Accessory Power Fuse Supply Voltage
30 2.5 VT/RD 801 Retained Accessory Power Fuse Supply Voltage
31 0.75 D-BU/WH 6128 Rear Closure Unlatch Motor Unlatch Control
32 0.75 RD/D-BU 242 Battery Positive Voltage
33 2.5 GY 1524 Backup Lamp Supply Voltage Signal
34 2.5 OG/BK 974 Battery Positive Voltage
35 2.5 RD/WH 1440 Battery Positive Voltage
36 6 RD/L-GN 1040 Battery Positive Voltage
37 2.5 RD/VT 740 Battery Positive Voltage
38 2.5 RD/D-BU 702 Battery Positive Voltage
39 2.5 RD/VT 3140 Battery Positive Voltage
40 - - Not Used
41 0.5 RD/YE 402 Battery Positive Voltage
42 0.75 RD/GY 142 Battery Positive Voltage
43 0.5 RD/WH 340 Battery Positive Voltage
44 1.5 OG 6815 Inadvertent Power Control
45 1.5 BN/RD 6136 Supply Voltage
46 0.75 RD/GY 142 Battery Positive Voltage
47 - - Not Used
48 10.00 RD/BK 5140 Battery Positive Voltage
49 10.00 RD/D-BU 5140 Battery Positive Voltage
Connector Part Information 
  • Harness Type: Instrument Panel
  • OEM Connector: 13595188
  • Service Connector: Service by Harness - See Part Catalog
  • Description: 32-Way Fuse Block (GY)
Terminal Part Information 
  • Pins: 16, 18, 19, 22-24, 26, 27, 29, 30, 33, 34, 36-39
  • Terminated Lead: Pending
  • Release Tool: NA
  • Diagnostic Test Probe: NA
  • Terminal/Tray: 13595182/ NA
  • Core/Insulation Crimp: Pending
  • Pins: 20, 25, 28, 31, 32, 41-43, 46
  • Terminated Lead: Pending
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 2-964284-1/25
  • Core/Insulation Crimp: E/A
  • Pins: 21, 44, 45
  • Terminated Lead: Pending
  • Release Tool: J-38125-36
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 4-965999-1/25
  • Core/Insulation Crimp: 4/A
  • Pins: 35
  • Terminated Lead: Pending
  • Release Tool: 12094430
  • Diagnostic Test Probe: J-35616-43 (RD)
  • Terminal/Tray: 15343823/19
  • Core/Insulation Crimp: G/G
  • Pins: 48, 49
  • Terminated Lead: Service by Harness - See Part Catalog
  • Release Tool: Not Available
  • Diagnostic Test Probe: Not Available
  • Terminal/Tray: Service by Harness - See Part Catalog
  • Core/Insulation Crimp: Not Available
Fig 15: X51A Fuse Block - Instrument Panel - Bottom View Relays
GM2353347Courtesy of GENERAL MOTORS CORP.
X51A Fuse Block - Instrument Panel - Bottom View Relays (Wire Entry)

Pin Wire Color Circuit No. Function
1 0.5 BK 1650 Ground
2 0.75 BK 1650 Ground
3 0.75 L-GN/BN 5706 Endgate Latch Relay Supply Voltage
4 0.75 D-BU/WH 6128 Rear Closure Unlatch Motor Unlatch Control
5 0.75 WH/RD 6795 Lift Glass/Trunk Motor Release Control 2
6 0.5 VT/D-BU 3263 Logistic Mode Relay Open Control
7 0.5 BK 1650 Ground
8 0.5 GY/VT 3264 Logistic Mode Relay Close Control
9 4 RD/VT 3140 Battery Positive Voltage
10 4 RD/VT 3140 Battery Positive Voltage
11 0.5 BK 1650 Ground
12 - - Not Used
13 0.5 BN/YE 43 Accessory Voltage
14 4 BN/YE 43 Accessory Voltage
15 4 RD/VT 3140 Battery Positive Voltage
Connector Part Information 
  • Harness Type: Instrument Panel
  • OEM Connector: 13595183
  • Description: 15-Way Relay Block (BK)
Terminal Part Information 
  • Pins: 1-8, 11, 13
  • Terminated Lead: Pending
  • Release Tool: Not Available
  • Diagnostic Test Probe: Not Available
  • Terminal/Tray: 13595182/ Not Available
  • Core/Insulation Crimp: Pending
  • Pins: 9, 10, 14, 15
  • Terminated Lead: Pending
  • Release Tool: 12094430
  • Diagnostic Test Probe: J-35616-42 (RD)
  • Terminal/Tray: 15344769/23
  • Core/Insulation Crimp: F/G
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