GM Service Manual Online
For 1990-2009 cars only
Connector 1: Fuse Block - Underhood Label
Connector 2: Fuse Block - Underhood Top View
Connector 3: Fuse Block - Underhood Bottom View
Connector 4: Fuse Block - Underhood X1
Connector 5: Fuse Block - Underhood X2
Connector 6: Fuse Block - Underhood X4
Connector 7: Fuse Block - Underhood X5
Connector 8: Fuse Block - Underhood X6
Connector 9: Fuse Block - Underhood X7
Connector 10: Fuse Block - Underhood X9

Fuse Block - Underhood Label


Object Number: 2181519  Size: MF

Fuse Block - Underhood Label Usage

Device

Rating

Description

ABS

10A

Not Used

ABS 1

30A

Electronic Brake Control Module (EBCM)

ABS 2

40A

Electronic Brake Control Module (EBCM)

A/C

10A

HVAC Control Module, Driver Seat Module (Heated Seat Switch), Passenger Seat Module (Heated Seat Switch)

A/C CMPRSR

10A

A/C Compressor Clutch Relay

AUX PWR 1

20A

Accessory Power Outlet - I/P 1, Data Link Connector

AUX PWR 2

20A

Accessory Power Outlet - I/P 2

BACKUP LAMP

15A

Backup Lamps

BCK/UP

15A

Not Used

BLWR

30A

HVAC Blower Motor

CRUISE

10A

Inside Rearview Mirror with Reading Lamps (DC4 with UE1 or DF8), Cruise Control Switch (K34), Transfer Case Control Module (NP1)

CLSTR

10A

Instrument Panel Cluster (IPC)

CNSTR VENT

10A

Evaporative Emission (EVAP) Canister Vent Solenoid Valve

DR/LCK

20A

Door Lock/Window Switch - Driver (AU3)

DRL

10A

DRL Relay

ERLS

15A

Evaporative Emission (EVAP) Canister Purge Solenoid Valve, MAF/IAT Sensor, Fuel Pump Flow Control Module

ETC

15A

Engine Control Module (ECM)

FRT AXLE

15A

Front Drive Axle Actuator (4WD)

FRT PRK LAMP

10A

Park Lamp - Left Front, Park Lamp - Right Front, Park/Turn Signal Lamp - Left, Park/Turn Signal Lamp - Right

FOG LAMP (T96)

15A

Fog Lamp Relay

FSCM

20A

Fuel Pump Flow Control Module

HORN

10A

Horn Relay

HTD/SEAT

20A

Heated Seat Assembly - Driver, Heated Seat Assembly - Passenger

IGN

15A

Ignition Coils

INJ

15A

Fuel Injectors

LT HDLP

10A

Headlamp Assembly - Left

MEGA FUSE

125A

Generator

PCM B

10A

Engine Control Module (ECM)

PCM I

10A

Engine Control Module (ECM)

PWR/WNDW

30A

Power Window - Driver, Power Window - Passenger, Power Window - Right Rear (Crew Cab), Power Window - Left Rear (Crew Cab)

PWR/SEAT

40A

Fuse Holder Power Seat

RDO

15A

Radio, Digital Radio Receiver

REAR PRK LAMP

15A

Right Tail Lamp Assembly, License Lamps

REAR PRK LAMP 2

15A

Left Tail Lamp Assembly, Body Control Module, Multifunction Switch - I/P

RT HDLP

10A

Headlamp Assembly - Right

RVC

10A

Generator Battery Control Module

STRTR

30A

STRTR Relay

STOP

20A

Stop Lamp Switch, VSES Relay

S/ROOF

20A

Sunroof Switch

TBC

10A

Body Control Module (BCM) - X1

TCM

10A

Transmission Control Module (TCM)

TCCM

10A

Transfer Case Shift Control Module (4WD)

TRAILER BRAKE

30A

Trailer Brake Provision

TRN/HAZRD FRT

15A

Body Control Module (BCM) (Bulb Out - Left Front, Right Front Turn Signal)

TRN/HAZRD REAR

15A

Body Control Module (BCM) (Bulb Out - Left Rear, Right Rear Turn Signal)

VSES

10A

Steering Wheel Position Sensor, Electronic Brake Control Module (EBCM)

WSW

10A

Windshield Wiper/Washer Switch

WPR

25A

Windshield Wiper Relay

O2 SNSR

15A

Heated Oxygen Sensor (HO2S) 1, Heated Oxygen Sensor (HO2S) 2

A/C COMP Relay

--

A/C Compressor Clutch Relay

BACKUP LAMP Relay

--

BACKUP Fuse

BEAM SEL Relay

--

Headlamp - LH (without TT5), Headlamp - RH (without TT5), Headlamp - Low Beam - Right/Left (TT5), Headlamp - High Beam - Right/Left (TT5)

DRL Relay

--

LT HDLP Fuse, RT HDLP Fuse

FOG LP Relay (T96)

--

Fog Lamp - Left Front, Fog Lamp - Right Front

HDLP Relay

--

RH HDLP Fuse, LH HDLP Fuse

HORN Relay

--

Horn Assembly

IGN 3 HVAC Relay

--

BLWR Fuse, A/C Fuse

PWR/TRN Relay

--

ETC Fuse, O2 SNSR Fuse

PRK/LAMP Relay

--

FRT PRK LAMP Fuse, REAR PRK LAMP Fuse, REAR PRK LAMP 2 Fuse

RAP Relay

--

S/ROOF Fuse, WSW Fuse, PWR/WNDW Fuse

RUN/CRNK Relay

--

FRT/AXLE Fuse, CRUISE Fuse, TRANS Fuse, BCK/UP Fuse, IGN Fuse, ERLS Fuse, INJ Fuse, FRT/AXL Fuse, PCM I Fuse

STRTR Relay

--

Starter Solenoid

VSES Relay

--

Center High Mounted Stop Lamps (CHMSL)

WPR Relay

--

WPR 2 Relay

WPR 2 Relay

--

Windshield Wiper Motor

Diode

--

A/C Clutch

Diode

--

Wiper Relays (Between)

Fuse Puller (If Equipped)

--

--

SPARE

10A

Spare Fuse, If Equipped

SPARE

15A

Spare Fuse, If Equipped

SPARE

20A

Spare Fuse, If Equipped

SPARE

25A

Spare Fuse, If Equipped

Fuse Block - Underhood Top View


Object Number: 2181520  Size: MF

Fuse Block - Underhood Bottom View


Object Number: 2181518  Size: MF

Fuse Block - Underhood X1


Object Number: 647944  Size: CH

Connector Part Information

  • OEM: 15319892
  • Service: See Catalog
  • Description: 32-Way F Metri-Pack 280 Series Flexlock (WH)

Terminal Part Information

  • Pins: A3
  • Terminal/Tray: 15324340/19
  • Core/Insulation Crimp: F/G
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)
  • Pins: B3, C2, D2, E1, E2, E5, E6, F1
  • Terminal/Tray: 12110844/4
  • Core/Insulation Crimp: Pins B3, C2, D2, E1, E2, E5 - E/A
  • Core/Insulation Crimp: Pins E6, F1 - E/C
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: E3, F3, F5
  • Terminal/Tray: 12110842/4
  • Core/Insulation Crimp: C/A
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Fuse Block - Underhood X1

Pin

Wire

Circuit

Function

A1-A2

--

--

Not Used

A3

3 RD/WH

1840

Battery Positive Voltage

A4

0.5 TN

848

ABS Brake Switch Signal

A5-A6

--

--

Not Used

B1-B2

--

--

Not Used

B3

0.5 BK

850

Ground

B4

0.8 L-BU

20

Stop Lamps Control

B5

0.35 PU

544

DRL Relay Control

B6

--

--

Not Used

C1

--

--

Not Used

C2

0.5 BK

850

Ground (T96)

C5-C6

--

--

Not Used

D1

--

--

Not Used

D2

0.5 BK

850

Ground (T96)

D5

0.35 GY

589

Daytime Running Lamps (DRL) Supply Voltage

D6

--

--

Not Used

E1

0.5 BK

850

Ground

0.35BK

850

Ground

E2

0.5 PU

34

Fog Lamps Control (T96)

0.5 PU

34

Fog Lamps Control (T96)

E3

0.35 OG

640

Headlamp Control

0.35 OG

640

Headlamp Control (TT5)

E4

--

--

Not Used

E5

0.35 PK

1200

High Beam Switch Ground

0.35 PK

1200

High Beam Switched Ground

E6

0.35 BN

9

Park Lamp Control

0.35 BN

9

Park Lamp Control

F1

0.35 D-GN

29

Horn Control

F2

--

--

Not Used

F3

0.35 OG

640

Headlamp Control

1 OG

640

Headlamp Control

F4

--

--

Not Used

F5

0.35 D-BU

1201

Low Beam Switched Ground

1 D-BU

1201

Low Beam Switched Ground

F6

0.35 GY

589

Daytime Running Lamps (DRL) Supply Voltage

Fuse Block - Underhood X2


Object Number: 647951  Size: CH

Connector Part Information

  • OEM: 15319896
  • Service: 15319896
  • Description: 68-Way F Metri-Pack 280 Series Flexlock (BK)

Terminal Part Information

  • Pins: A6, B2, B5-B6, C2-C3, C11, D2-D3, D5, D11, E3, E5, E7, E11, F3-F5, F7-F8
  • Terminal/Tray: 12110844/4
  • Core/Insulation Crimp: Pins A6, B2, C2-C3, C11, D2-D3, D5, D11, E3, E5, E7, E11, F3-F5, F8 - E/A
  • Core/Insulation Crimp: Pins B5-B6, F7 - E/C
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: B11, E2
  • Terminal/Tray: 15324340/19
  • Core/Insulation Crimp: Pins B11 - See Terminal Repair Kit
  • Core/Insulation Crimp: Pins E2 - F/G
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)
  • Pins: F11
  • Terminal/Tray: 12110842/4
  • Core/Insulation Crimp: A/B
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Fuse Block - Underhood X2

Pin

Wire

Circuit

Function

A1-A7

--

--

Not Used

A8

0.5 OG

440

Battery Positive Voltage (M30)

A9-A10

--

--

Not Used

A11

2 BK/WH

451

Ground

0.5 BK/WH

451

Ground

A12

--

--

Not Used

B1

--

--

Not Used

B2

0.5 PK

1539

Ignition Voltage (4WD)

B3-B4

--

--

Not Used

B5

0.35 D-GN

59

A/C Compressor Clutch Control (C60)

B6

0.35 BK

350

Ground (C60)

B7-B10

--

--

Not Used

B11

2 BK/WH

451

Ground

B12

--

--

Not Used

C1

--

--

Not Used

C2

0.5 PK

139

Ignition Voltage (M30)

0.35 PK

139

Ignition Voltage (M30)

C3

0.5 PK

539

Ignition Voltage (LH8)

C4-C5

--

--

Not Used

C8

1 OG

2040

Battery Positive Voltage

0.5 OG

2040

Battery Positive Voltage

C9-C10

--

--

Not Used

C11

0.5 BK/WH

451

Ground

0.5 BK/WH

451

Ground (MA5)

C12

--

--

Not Used

D1

--

--

Not Used

D2

0.5 BK/WH

451

Ground

D3

0.5 PK

239

Ignition Voltage

0.5 PK

239

Ignition Voltage (LLR)

D4

--

--

Not Used

D5

0.5 PK

439

Ignition Voltage

0.5 PK

439

Ignition Voltage (K18)

D8

3 OR

1940

Battery Positive Voltage

D9-D10

--

--

Not Used

D11

0.5 BK

550

Ground

0.5 BK

550

Ground (LLR)

D12

--

--

Not Used

E1

--

--

Not Used

E2

5 PU

6

Starter Solenoid Crank Voltage

E3

0.5 PK

239

Ignition Voltage

E4

--

--

Not Used

E5

0.5 PK

439

Ignition Voltage

0.5 PK

439

Ignition Voltage

E6

--

--

Not Used

E7

0.5 BK

550

Ground

E8-E10

--

--

Not Used

E11

0.5 BK

550

Ground

0.5 BK

550

Ground

E12

--

--

Not Used

F1

0.35 BN

441

Ignition Voltage

F2

--

--

Not Used

F3

0.5 PK

239

Ignition Voltage

0.5 PK

239

Ignition Voltage

F4

0.5 PK

839

Ignition Voltage

F5

0.5 PK

414

Ignition Voltage

F6

--

--

Not Used

F7

0.35 BK

550

Ground (4WD)

0.35 BK

550

Ground (4WD)

F8

0.35 BK

550

Ground (4WD)

0.35 BK

550

Ground (4WD)

F9-F10

--

--

Not Used

F11

2 BK

550

Ground

0.5 BK

550

Ground (K18)

F12

--

--

Not Used

Fuse Block - Underhood X4


Object Number: 647933  Size: CH

Connector Part Information

  • OEM: 12193695
  • Service: 88987862
  • Description: 2-Way F Maxi-Fuse (WH)

Terminal Part Information

  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
  • Release Tool/Test Probe: 12150860/J-35616-44 (YE)

Fuse Block - Underhood X4

Pin

Wire

Circuit

Function

A

2 YE

443

Ignition Voltage (A31)

YE

443

Ignition Voltage (Regular/Extended Cab with A31)

B

2 BN

41

Ignition Voltage

Fuse Block - Underhood X5


Object Number: 647933  Size: CH

Connector Part Information

  • OEM: 12193693
  • Service: 15306393
  • Description: 2-Way F Maxi-Fuse (BK)

Terminal Part Information

  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
  • Release Tool/Test Probe: 12150860/J-35616-44 (YE)

Fuse Block - Underhood X5

Pin

Wire

Circuit

Function

A

2 OG

540

Battery Positive Voltage

B

3 RD

542

Battery Positive Voltage

Fuse Block - Underhood X6


Object Number: 647947  Size: CH

Connector Part Information

  • OEM: 15319893
  • Service: 15319893
  • Description: 32-Way F Metri-Pack 280 Series Flexlock (GY)

Terminal Part Information

  • Pins: A2-A4, B2-B3, B5, E3, E6, F1, F3-F4
  • Terminal/Tray: 12110844/4
  • Core/Insulation Crimp: Pins A2, A4, E3, E6 - E/A
  • Core/Insulation Crimp: Pins A3, B2-B3, B5, F1, F3-F4 - E/C
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: A5
  • Terminal/Tray: 12110842/4
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: B1, F5
  • Terminal/Tray: 12110844/4
  • Core/Insulation Crimp: C/A
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Fuse Block - Underhood X6

Pin

Wire

Circuit

Function

A1

--

--

Not Used

A2

0.5 OG

1440

Battery Positive Voltage

A3

--

--

Not Used

A4

0.5 OG

1540

Battery Positive Voltage (4WD)

A5

0.8 OG

2240

Battery Positive Voltage (AG1/AG2)

0.8 OG

2240

Battery Positive Voltage (AG1/AG2)

A6

--

--

Not Used

B1

0.8 BK

850

Ground

B2

0.35 PK/WH

1970

Headlamp Relay Control

B3

0.35 PK

339

Ignition Voltage

B4

--

--

Not Used

B5

0.35 PK

339

Ignition Voltage

0.35 PK

339

Ignition Voltage (K34/4WD)

B6

--

--

Not Used

C1-C2

--

--

Not Used

C5-C6

--

--

Not Used

D1-D2

--

--

Not Used

D5-D6

--

--

Not Used

E1-E2

--

--

Not Used

E3

0.5 D-BU

338

Ignition Voltage

E4-E5

--

--

Not Used

E6

0.5 PK

739

Ignition Voltage

F1

0.35 BN/WH

301

Park Lamp Relay Control

F2

--

--

Not Used

F3

0.35 BK

850

Ground

F4

0.35 YE

5991

Powertrain Relay Control

F5

0.8 OG

1240

Battery Positive Voltage (AU3)

F6

--

--

Not Used

Fuse Block - Underhood X7


Object Number: 647955  Size: CH

Connector Part Information

  • OEM: 13588097
  • Service: 15319897
  • Description: 68-Way F Metri-Pack 280 Series Flexlock (L-GY)

Terminal Part Information

  • Pins: A1, A4-A5, A7-A8, A10, B7, B11, C2, C10-C11, D1- D4, D8, E2-E4, E7, E9, E11, F3, F5, F7, F10-F12
  • Terminal/Tray: 12110844/4
  • Core/Insulation Crimp: Pins A1, A4-A5, A7-A8, C10-C11, D1, D4, E2, E7, E9, F3, F5, F7, F10-F12 - E/C
  • Core/Insulation Crimp: Pins A10, B7, B11, C2, D2-D3, D8, E3-E4, E11 - C/A
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: B2-B3, B10, C1, C3, C5, D5, E5-E6, F6
  • Terminal/Tray: 12110844/4
  • Core/Insulation Crimp: E/A
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Fuse Block - Underhood X7

Pin

Wire

Circuit

Function

A1-A3

--

--

Not Used

A4

0.35 OG

440

Battery Positive Voltage

A5

0.35 BK

28

Horn Relay Control

A6

--

--

Not Used

A7

0.35 YE

317

Fog Lamp Relay Control (T96)

A8

0.35 PK

39

Ignition 1 Voltage

A9

--

--

Not Used

A10

0.8 YE

343

Ignition Voltage (CF5)

A11

1 OG

140

Battery Positive Voltage

A12

--

--

Not Used

B1

--

--

Not Used

B2

0.5 OG

740

Battery Positive Voltage

B3

0.5 OG

1340

Battery Positive Voltage

B4-B6

--

--

Not Used

B7

0.8 L-GN

24

Backup Lamp Control

0.5 BN

24

Backup Lamp Control (DF5)

B8-B9

--

--

Not Used

B10

0.5 YE

143

Ignition Voltage

B11

0.8 OG

240

Battery Positive Voltage (KC5)

B12

--

--

Not Used

C1

0.5 OG

840

Battery Positive Voltage

C2

1 BK

850

Ground

C3-C4

--

--

Not Used

C5

0.5 BN

9

Park Lamps Control

C8-C9

--

--

Not Used

C10

0.35 BK/WH

1969

Beam Select Relay Control

C11

0.35 BN

9

Park Lamp Control (A31)

C12

--

--

Not Used

D1

0.35 YE/BK

625

Starter Relay Control

D2

1 PU

92

Windshield Wiper Motor High Speed

D3

1 D-GN

95

Windshield Wiper Motor Low Speed

D4

0.35 GY

91

Windshield Wiper Switch Signal 2

D5

0.35 BN

9

Park Lamp Control

0.5 BN

9

Park Lamp Control

D8

0.8 OG

40

Battery Positive Voltage

D9-D12

--

--

Not Used

E1

--

--

Not Used

E2

0.35 OG

1640

Battery Positive Voltage

E3

--

--

Not Used

E4

1 OG

1140

Battery Positive Voltage

E5

0.5 BN

9

Park Lamps Control

E6

--

--

Not Used

E7

0.35 D-GN

113

Windshield Wiper Switch Signal 2

E8

--

--

Not Used

E9

0.35 BN

141

Ignition Voltage (KA1)

0.35 BN

141

Ignition Voltage

E10-E12

--

--

Not Used

F1-F2

--

--

Not Used

F3

0.35 PK

639

Ignition Voltage

F4

--

--

Not Used

F5

0.35 D-GN/WH

459

A/C Compressor Relay Control

F6-F9

--

--

Not Used

F10

0.35 OG

300

Ignition Voltage

F11

0.35 BN

9

Park Lamp Control (A31)

F12

0.35 BK

755

RAP Relay Coil Control

Fuse Block - Underhood X9


Object Number: 647937  Size: CH

Connector Part Information

  • OEM: 12193696
  • Service: 15306413
  • Description: 2-Way F Maxi-Fuse (BN)

Terminal Part Information

  • Pins: A
  • Terminal/Tray: 12110127/19
  • Core/Insulation Crimp: F/G
  • Release Tool/Test Probe: 12150860/J-35616-44 (YE)

Fuse Block - Underhood X9

Pin

Wire

Circuit

Function

A

3 RD

242

Battery Positive Voltage

B

--

--

Not Used