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

Fuse Block - Underhood Label


Object Number: 1360980  Size: MF

Fuse Block - Underhood Label Usage

No.

Device

Rating

Description

1

STOP

20A

Stop Lamp Switch

2

AUX

20A

Auxiliary Power Outlets, Data Link Connector (DLC)

5

A/C

10A

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

8

WIP/WASH

10A

Windshield Wiper/Washer Switch

9

FOG LP (T96)

15A

Fog Lamp Relay

10

IGN TRNSD

10A

Ignition Switch (Transducer)

11

LH HDLP

10A

Headlamp Assembly - Left

12

RH HDLP

10A

Headlamp Assembly - Right

13

FUEL PMP

15A

Fuel Pump

14

WIPER

25A

Windshield Wiper Relay

15

FRT AX

15A

Front Axle Actuator (4WD)

16

ABS

10A

Electronic Brake Control Module (EBCM), Yaw Rate Sensor (4WD)

17

SIR

10A

Inflatable Restraint Sensing and Diagnostic Module (SDM), Inflatable Restraint I/P Module Disable Switch (C99)

18

HTD SEAT

20A

Heated Seat Assembly - Driver, Heated Seat Assembly - Passenger

19

CRUISE

10A

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

20

ETC

15A

Engine Control Module (ECM)

21

DOOR LOCK

20A

Door Lock Switch - Driver (AU3)

22

INJECTOR

15A

Fuel Injectors

23

IGN

15A

Clutch Start Switch (MA5), Ignition Coil 1 Module, Ignition Coil 2 Module, Ignition Coil 3 Module, Ignition Coil 4 Module, Ignition Coil 5 Module (3.5L), Park/Neutral Position (PNP) Switch (M30), A/C Compressor Clutch Relay

24

TRANS

10A

Transmission Solenoids

25

PCMI

10A

Engine Control Module (ECM)

26

BACKUP

15A

Park/Neutral Position (PNP) Switch

27

ERLS

15A

Evaporative Emission (EVAP) Canister Purge Solenoid Valve, MAF/IAT Sensor

28

TURN/HAZ RR

15A

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

29

RR PK LP2

10A

Left Tail Lamp Assembly, Body Control Module (BCM) - Dimmed Lights, Passenger Airbag Indicator

30

PCM B

10A

Engine Control Module (ECM)

31

ON STAR

10A

Vehicle Communication Interface Module (VCIM)

32

RADIO

15A

Radio

33

CIGAR

20A

Cigar Lighter

34

TBC

10A

Body Control Module (BCM) - C1

35

HORN

10A

Horn Relay

36

TCCM

10A

Transfer Case Shift Control Module (4WD)

37

TURN/HAZ FR

15A

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

38

CLUSTER

10A

Instrument Panel Cluster (IPC)

39

RR PK LP

15A

Right Tail Lamp Assembly, License Lamps

40

FR PK LP

10A

Park Lamp - Left Front, Park Lamp - Right Front, Window Switch - Driver, Window Switch - Passenger, Window Switch - Left Rear (Crew Cab), Window Switch - Right Rear (Crew Cab)

41

BLOWER

30A

HVAC Blower Motor

42

PWR/WINDOW

30A

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

43

START

30A

START Relay

44

ABS 2

40A

Electronic Brake Control Module (EBCM) (Relay)

45

ABS 1

30A

Electronic Brake Control Module (EBCM)

46

PWR/SEAT

40A

Seat - Driver (Circuit Breaker)

47

BEAM SEL Relay

--

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

50

A/C COMP Relay

--

A/C Compressor Clutch Relay

51

FUEL PUMP Relay

--

Fuel Tank Pressure (FTP) Sensor, Fuel Pump and Sender Assembly

52

FOG LP Relay (T96)

--

Fog Lamp - Left Front, Fog Lamp - Right Front

53

PARK LP Relay

--

FR PK LP Fuse, RR PK LP Fuse, RR PK LP2 Fuse

54

HD LP Relay

--

RH HDLP Fuse, LH HDLP Fuse

55

HORN Relay

--

Horn Assembly

56

POWERTRAIN Relay

--

ETC Fuse, O2 Sensor Fuse

57

WIPER Relay

--

WIPER 2 Relay

58

RAP Relay

--

WIPER SW Fuse, PWR WDO Fuse

59

IGN 3 HVAC Relay

--

BLOWER Fuse, CNTRL HD Fuse

61

RUN/CRANK Relay

--

SIR Fuse, CRUISE Fuse, IGN Fuse, TRANS Fuse, BACK UP Fuse, ABS Fuse, ERLS Fuse, FRT AXLE CNTRL Fuse, PCM 1 Fuse and INJECTORS Fuse

62

START Relay

--

Starter Solenoid

63

WIPER 2 Relay

--

Windshield Wiper Motor

64

Diode

--

Wiper Relays (Between)

65

Diode

--

A/C Clutch

66

Maxi Fuse

100A

Generator

67

Fuse Puller (If Equipped)

--

--

69

CAN VENT

10A

Evaporative Emission (EVAP) Canister Vent Solenoid Valve

72

SPARE

10A

Spare Fuse, If Equipped

73

SPARE

15A

Spare Fuse, If Equipped

74

SPARE

20A

Spare Fuse, If Equipped

75

SPARE

25A

Spare Fuse, If Equipped

77

A/C COMP

10A

A/C Compressor Clutch Relay

79

O2 SENSOR

10A

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

Fuse Block - Underhood Top View


Object Number: 1361004  Size: MF

Fuse Block - Underhood Bottom View


Object Number: 1991090  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-A6

--

--

Not Used

B1-B2

--

--

Not Used

B3

0.5 BK

850

Ground

B4-B6

--

--

Not Used

C1

--

--

Not Used

C2

0.5 BK

850

Ground (T96)

C3-C6

--

--

Not Used

D1

--

--

Not Used

D2

0.5 BK

850

Ground (T96)

D3-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

--

--

Not Used

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-A5

--

--

Not Used

A6

0.5 L-GN

24

Backup Lamps Control

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

C4-C7

--

--

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-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

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

0.35 YE

1139

Ignition Voltage

0.35 YE

1139

Ignition Voltage

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: 15319897
  • 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

0.35 PK

1439

Ignition Voltage

0.35 PK

1439

Ignition Voltage (4WD)

A2-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 D-GN/WH

465

Fuel Pump Relay Control

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

1 GY

120

Fuel Pump Control

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

0.5 OG

1740

Battery Positive Voltage

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

0.8 OG

340

Battery Positive Voltage (UE1)

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

0.5 L-GN

24

Backup Lamp Control

0.5 L-GN

24

Backup Lamp Control (DF8)

F7-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