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 C1
Connector 5: Fuse Block - Underhood C2
Connector 6: Fuse Block - Underhood C3
Connector 7: Fuse Block - Underhood C4
Connector 8: Fuse Block - Underhood C5 (UNH/UNJ/UNR)

Fuse Block - Underhood, Label


Object Number: 1612893  Size: MF

Fuse Block - Underhood, Label Usage

No.

Device

Rating

Description

1

HTD/SEATS Fuse

20A

Heater Element Seat Cushion - Driver, Heated Seat Module - Passenger

2

GRILLE GUARD Fuse

20A

Not Used (Dealer Installed - Grille Guard Lights)

3

FUEL/PUMP Fuse

15A

Fuel Pump and Sender Assembly

4

ROOF LP Fuse

20A

Not Used (Dealer Installed - Roof Rack Lights)

5

BATT IGN SWTCH Fuse

10A

Ignition Switch

6

FRT/WPR Fuse

25A

ON/OFF WPR Relay

7

SPARE-1 Fuse

15A

Not Used

8

PWR/LKS Fuse

20A

Door Lock and Window Switch - Driver

9

S/ROOF FRT/WPR PUMP Fuse

15A

Sunroof Module, Turn Signal/Multifunction Switch, Automatic Transmission Floor Shift Control

10

SPO Fuse

10A

Not Used (To be added by SPO)

11

AIR CMPRSR Fuse

25A

Not Used

12

TCCM Fuse

30A

Transfer Case Shift Control Module

13

RDO Fuse

10A

Radio, HVAC Control Module

14

BCM Fuse

10A

Body Control Module (BCM)

15

REAR/WPR MTR Fuse

15A

Rear Window Wiper/Washer Module

16

REAR WPR SWTCH/PUMP Fuse

15A

Rear Window/Wiper Washer Switch, Rear Window Washer Fluid Pump

17

SPARE-2 Fuse

10A

Not Used

18

SPARE-6 Fuse

10A

Not Used

19

CLSTR Fuse

10A

Instrument Panel Cluster (IPC)

20

REAR TRN/HAZRD Fuse

20A

Body Control Module (BCM)

21

PCM-I Fuse

10A

Powertrain Control Module (PCM)

22

ENG CNTRL SYS Fuse

15A

Evaporative Emission (EVAP) Canister Purge Solenoid Valve, Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor

23

INJ Fuse

15A

Fuel Injectors 1-5

24

FOG/LP Fuse

15A

Fog Lamp - Left/Right

25

PCM-B Fuse

10A

Powertrain Control Module (PCM) C1

26

SPARE-4 Fuse

10A

Not Used

27

AIRBAG Fuse

10A

Inflatable Restraint Vehicle Rollover Sensor, Accessory Switch, Inflatable Restraint Sensing and Diagnostic Module (SDM), Inflatable Restraint Front Passenger Presence System (PPS) Sensor

28

BCK/LP Fuse

15A

Backup Lamp Switch (MA5), Park/Neutral Position (PNP) Switch (M30)

29

ABS/VSES Fuse

10A

Electronic Brake Control Module (EBCM)

30

R/WDO DEFG Fuse

20A

Rear Window Defogger

31

CNSTR VENT Fuse

10A

Evaporative Emission (EVAP) Canister Vent Solenoid Valve

32

SPARE-5 Fuse

10A

Not Used

33

IGN 1 Fuse

15A

Clutch Start Switch (MA5), Park/Neutral Position (PNP) Switch (M30), Ignition Coils

34

TRANS Fuse

10A

Automatic Transmission (M30)

35

CRUISE/MISC Fuse

10A

Inside Rearview Mirror, Turn Signal/Multifunction Switch, Clutch Switch (MA5), TCC Brake/Cruise Release Switch

36

HORN Fuse

10A

Horn

37

LR PRK Fuse

10A

Tail/Stop and Turn Signal Lamp - Left, Body Control Module (BCM)

38

AMP Fuse

25A

Digital Radio Receiver

39

SPARE-7 Fuse

10A

Not Used

40

RH HDLP Fuse

10A

Headlamp - Right

41

LH HDLP Fuse

10A

Headlamp - Left

42

TRLR BCK/LP Fuse

10A

Trailer Connector (UY7)

43

FRT/PRK Fuse

10A

Marker Lamp LF/RF, Park/Turn Signal Lamp LF/RF, Door Lock and Window Switch - Driver/Passenger, Door Window Switch - LR/RR

44

AIR SOL Fuse

15A

Not used

45

AUX PWR 2 Fuse

20A

Accessory Power Outlet - Front, Accessory Power Outlet - Rear

46

ETC Fuse

15A

Powertrain Control Module (PCM)

47

O2 SNSR Fuse

15A

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

48

A/C CLUTCH Fuse

10A

A/C Compressor Clutch, A/C CLUTCH Diode

49

RR PRK Fuse

10A

Tail/Stop and Turn Signal Lamp - Right, License Lamp

50

SDARs Fuse

10A

Not Used

51

AUX PWR 1 Fuse

20A

Cigar Lighter, Data Link Connector (DLC)

52

VSES/ABS Fuse

10A

Electronic Brake Control Module (EBCM), Steering Wheel Position Sensor (JL4), Yaw Rate/Latereral and Longitudinal Accelerometer Sensor (JL4)

53

PWR HTR SWTCH Fuse

10A

Lumbar Adjuster/Heater Switch - Driver/Passenger

54

STOP Fuse

15A

Stop Lamp Switch

55

TRLR Fuse

10A

Trailer Connector

56

FRT TRN/HAZRD/CTSY MIR Fuse

15A

Body Control Module (BCM)

57

PWR S/ROOF Fuse

30A

Sunroof Motor

58

TCCM SWTCH Fuse

10A

Accessory Switch

59

HVAC CNTRL HD Fuse

10A

HVAC Control Module

60

SPARE-8 Fuse

10A

Not Used

61

PWR SEATS Fuse

40A

Power Seat Switches

62

AIR PUMP Fuse

60A

Not Used

63

RT PWR WNDW Fuse

30A

Door Lock and Window Switch - Passenger, Door Window Switch - RR

64

ABS/VSES2-MTR Fuse

30A

Electronic Brake Control Module (EBCM)

65

WPR Diode

--

Cathode-WIPER ON/OFF RELAY, Anode-WIPER HI/LO RELAY

66

FUEL/PUMP Relay

--

FUEL/PUMP Fuse

67

ABS/VSES1-SOL Fuse

40A

Electronic Brake Control Module (EBCM)

68

LT PWR WNDW Fuse

30A

Door Lock and Window Switch - Driver, Door Window Switch - LR

69

FOG/LP Relay

--

FOG/LP Fuse

70

HI/LO BEAM RELAY Relay

--

HI Beam Headlamp, Low Beam Headlamp

71

RR DEFOG Relay

--

R/WDO DEFG Fuse

72

ON/OFF WPR Relay

--

HI/LOW WPR Relay

73

HI/LOW WPR Relay

--

Windshield Wiper Motor

74

HORN Relay

--

HORN Fuse

75

HDLP Relay

--

LH HDLP, and RH HDLP Fuses

76

A/C CLUTCH Relay

--

A/C CLUTCH Fuse

77

PCM CNTRL Relay

--

Starter Solenoid

78

RUN/CRNK Relay

--

AIRBAG, CRUISE/MISC, IGN1, TRANS, BCK/UP, ABS/VSES, ENG CNTRL SYS, PCM-I, and INJ Fuses

79

SPARE-1 Relay

--

SPARE-1 RELAY

80

AIR SOL Relay

--

Engine Control Module (ECM)

81

PWR/TRN Relay

--

O2 SNSR, and ETC Fuse

82

HVAC BLWR Fuse

30A

Blower Motor, High Speed Blower Motor Relay

83

E-BRAKE Fuse

30A

Electronic Brake Module (Blunt Cut)

84

TRLR B+ Fuse

30A

Trailer Connector

85

STRTR Fuse

30A

PCM CNTRL Relay

86

SPARE-2 Relay

--

Not Used

87

HVAC Relay

--

HVAC BLWR, HVAC CNTRL HD, PWR HTR SWTCH, TCCM SWTCH, and VSES/ABS Fuses

88

RAP/ACCY Relay

--

LT PWR WNDW, RT PWR WNDW, S/ROOF FRT/WPR, REAR WPR SWTCH/PUMP, SPO, and REAR/WPR MTR Fuses

89

PRK/LP Relay

--

LR PRK, RR PRK, FRT/PRK, and TRLR Fuses

90

A/C CLUTCH Diode

--

A/C Clutch Diode

91

MEGAFUSE

125A

Generator

Fuse Block - Underhood, Top View


Object Number: 1612881  Size: MF

Fuse Block - Underhood, Bottom View


Object Number: 1612889  Size: MF

Fuse Block - Underhood C1


Object Number: 1566789  Size: CH

Connector Part Information

  • OEM: 6098-4578
  • Service: 89046975
  • Description: 47-Way F LIF 1.5mm/2.8mm/6.3mm (GY)

Terminal Part Information

  • Pins: 1-2, 11-14, 22-24
  • Terminal/Tray: 15304711 / 8
  • Core/Insulation Crimp: Pins 1, 11-13, 22, 23: 2 / A
  • Core/Insulation Crimp: Pins 2, 14, 24: E / A
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: 4-10, 16-20, 26-32, 36-72
  • Terminal/Tray: 12191812 / 19
  • Core/Insulation Crimp: Pins 4-10, 16-20, 27-32, 36-38, 42: E / C
  • Core/Insulation Crimp: Pins 21, 26, 41: C / A
  • Release Tool/Test Probe: 15315247 / J-35616-2A (GY)
  • Pins: 33
  • Terminal/Tray: 15304713 / 19
  • Core/Insulation Crimp: 4 / 4
  • Release Tool/Test Probe: 15315247 / J-35616-4A (PU)
  • Pins: 43, 45-47
  • Terminal/Tray: 7116-4122-02 / 10
  • Core/Insulation Crimp: A / B
  • Release Tool/Test Probe: 12094430 / J-35616-42 (RD)
  • Pins: 44
  • Terminal/Tray: 7116-4121-02 / 10
  • Core/Insulation Crimp: C / B
  • Release Tool/Test Probe: 12094430 / J-35616-42 (RD)

Fuse Block - Underhood C1

Pin

Wire Color

Circuit No.

Function

1

D-GN

1433

PNP/Clutch Start Switch Signal

D-GN

1433

PNP/Clutch Start Switch Signal

2

PK

239

Ignition 1 Voltage

3

--

--

Not Used

4

WH/BK

448

Powertrain Diagnostic Enable

5

--

--

Not Used

6

BN/WH

2609

Right Rear Park Lamp Supply Voltage

7

BN/WH

2609

Right Rear Park Lamp Supply Voltage

8

YE

1139

Ignition 1 Voltage

9

BN

9

Park Lamp Supply Voltage

10

BN

9

Park Lamp Supply Voltage

11

D-BU/WH

339

Ignition 1 Voltage

PK

339

Ignition 1 Voltage

12

OG

140

Battery Positive Voltage

13

OG

2240

Battery Positive Voltage (KA1)

14

BN

441

Ignition 3 Voltage

15

--

--

Not Used

16

RD/BK

1594

Ignition 3 Relay Coil Control

17

YE

1139

Ignition 1 Voltage (ASF)

18

YE

1139

Ignition 1 Voltage

19

BN

41

Ignition 3 Voltage

20

YE

1139

Ignition 1 Voltage

21

L-GN

24

Backup Lamp Supply Voltage

22

PK

339

Ignition 1 Voltage

PK

339

Ignition 1 Voltage

23

OG

40

Battery Positive Voltage

24

BN

241

Ignition 3 Voltage

25

--

--

Not Used

26

OG

1140

Battery Positive Voltage

27

OG

1440

Battery Positive Voltage

28

--

--

Not Used

29

BN

2509

Left Rear Park Lamp Supply Voltage

30

OG

2440

Battery Positive Voltage

31

--

--

Not Used

32

OG

1340

Battery Positive Voltage

33

OG

2140

Battery Positive Voltage

34-35

--

--

Not Used

36

BK

755

RAP Relay Coil Control

37

D-BU

338

Run/Crank Voltage

38

OG

440

Battery Positive Voltage

39-40

--

--

Not Used

41

BN

2109

Trailer Park Lamps Supply Voltage

42

BN/WH

301

Park Lamp Relay Control

43

RD

242

Battery Positive Voltage

44

YE

643

Accessory Voltage

45

OG

1840

Battery Positive Voltage (YC3)

46

RD

742

Battery Positive Voltage

47

BN

141

Ignition 3 Voltage

Fuse Block - Underhood C2


Object Number: 1566788  Size: CH

Connector Part Information

  • OEM: 6098-4577
  • Service: See Catalog
  • Description: 47-Way F LIF 1.5mm/2.8mm/6.3mm (WH)

Terminal Part Information

  • Pins: 1, 13
  • Terminal/Tray: 15304713 / 19
  • Core/Insulation Crimp: Pin 1: 4 / 4
  • Core/Insulation Crimp: Pin 13: F / D
  • Release Tool/Test Probe: 15315247 / J-35616-4A (PU)
  • Pins: 2, 12-14, 22-25, 33, 35
  • Terminal/Tray: 15304711 / 8
  • Core/Insulation Crimp: Pins 2, 12, 24: E / A
  • Core/Insulation Crimp: Pins 14, 22, 25, 33-35: 2 / A
  • Release Tool/Test Probe: 15315247 / J-35616-4A (PU)
  • Pins: 5-10, 15-21, 26-32, 36-42
  • Terminal/Tray: 12191812 / 19
  • Core/Insulation Crimp: Pins 5, 7-9, 15, 17-21, 26-32, 36-42: E / C
  • Core/Insulation Crimp: Pins 10, 16: C / A
  • Release Tool/Test Probe: 15315247 / J-35616-2A (GY)
  • Pins: 43, 47
  • Terminal/Tray: 7116-4121-02 / 10
  • Core/Insulation Crimp: C / B
  • Release Tool/Test Probe: 12094430 / J-35616-42 (RD)
  • Pins: 44-46
  • Terminal/Tray: 7116-4122-02 / 10
  • Core/Insulation Crimp: A / B
  • Release Tool/Test Probe: 12094430 / J-35616-42 (RD)

Fuse Block - Underhood C2

Pin

Wire Color

Circuit No.

Function

1

OG

1140

Battery Positive Voltage (UQA)

2

BN

341

Ignition 3 Voltage (YC3)

3-4

--

--

Not Used

5

PU

34

Front Fog Lamp Supply Voltage

6

--

--

Not Used

7

PK

1439

Ignition 1 Voltage

8

OG

640

Battery Positive Voltage

9

D-GN

1329

Horn Fuse Supply Voltage

10

L-GN

24

Backup Lamp Supply Voltage

11

--

--

Not Used

12

OG

1740

Battery Positive Voltage

13

BK

293

Rear Defog Element Supply Voltage

14

GY

120

Fuel Pump Supply Voltage

15

YE

243

Accessory Voltage

16

YE

143

Accessory Voltage

17

PK

639

Ignition 1 Voltage

18

PK

739

Ignition 1 Voltage

19

BK/WH

1969

Headlamp High Beam Relay Control

20

D-BU

1201

Headlamp Low Beam

21

BK

28

Horn Relay Control

22

OG

1240

Battery Positive Voltage

23

D-GN

95

Windshield Wiper Motor Low Speed Control

24

OG

2040

Battery Positive Voltage

25

OG

840

Battery Positive Voltage

26

YE

343

Accessory Voltage

27

YE

343

Accessory Voltage

28

--

--

Not Used

29

YE

317

Fog Lamp Relay Control

30

PK

1200

Headlamp High Beam Signal

31

--

--

Not Used

32

PK/WH

1970

Headlamp Relay Control

33

PU

92

Windshield Wiper Motor High Speed Control

34

BK

850

Ground

35

OG

240

Battery Positive Voltage

36

D-GN/WH

465

Fuel Pump Relay Control

37

D-GN

113

Windshield Wiper Switch Signal 1

38

D-GN/WH

459

A/C Compressor Clutch Relay Control

39

YE/BK

625

Starter Enable Relay Control

40

WH

193

Rear Defog Relay Control

41

GY

91

ON/OFF Wiper Relay Control

42

OG

740

Battery Positive Voltage

43

OG

2340

Battery Positive Voltage

44

OG

540

Battery Positive Voltage

45

OG

1640

Battery Positive Voltage

46

OG

540

Battery Positive Voltage

47

YE

443

Accessory Voltage

Fuse Block - Underhood C3


Object Number: 1566779  Size: CH

Connector Part Information

  • OEM: 6098-2450
  • Service: See Catalog
  • Description: 32-Way F LIF 090 (WH)

Terminal Part Information

  • Pins: 1-30
  • Terminal/Tray: 8240-4882 / 22
  • Core/Insulation Crimp: E / C
  • Release Tool/Test Probe: 15315247 / J-35616-18 (BK)
  • Pins: 31-32
  • Terminal/Tray: 8240-4942 / 22
  • Core/Insulation Crimp: 2 / 1
  • Release Tool/Test Probe: 15315247 / J-35616-18 (BK)

Fuse Block - Underhood C3

Pin

Wire Color

Circuit No.

Function

1

PK

139

Ignition 1 Voltage (M30)

2

PK

539

Ignition 1 Voltage

3

PK

439

Ignition 1 Voltage

4

PK

439

Ignition 1 Voltage

5

D-GN

59

A/C Compressor Clutch Supply Voltage

6

YE

1737

Neutral Safety Switch Park/Neutral Signal (M30)

7

PK

239

Ignition 1 Voltage (M30)

8

PK

239

Ignition 1 Voltage

9

PK

239

Ignition 1 Voltage

10

PK

239

Ignition 1 Voltage

11

PK

239

Ignition 1 Voltage

12

PK

239

Ignition 1 Voltage

13

L-GN

24

Backup Lamp Supply Voltage

14

--

--

Not Used

15

PK

414

Heated Oxygen Sensor Heater Supply Voltage

16

PK

414

Heated Oxygen Sensor Heater Supply Voltage

17

BK

550

Ground

18

BK

550

Ground

19

BK

550

Ground

20-21

--

--

Not Used

22

PK

839

Ignition 1 Voltage

23

BK

550

Ground

24

BK

550

Ground

25

BK

550

Ground

26

BK

550

Ground

27-28

--

--

Not Used

29

BK/WH

451

Ground (M30)

30

BK/WH

451

Ground

31

BK/WH

451

Ground

32

BK/WH

451

Ground

Fuse Block - Underhood C4


Object Number: 1566792  Size: CH

Connector Part Information

  • OEM: 6098-1104
  • Service: 15193791
  • Description: 2-Way F TS (WH)

Terminal Part Information

  • Terminal: 8100-2493 / 6
  • Core/Insulation Crimp: F / B
  • Release Tool/Test Probe: 15315247 / J-35616-44 (YE)

Fuse Block - Underhood C4

Pin

Wire Color

Circuit No.

Function

1

PU

6

Starter Solenoid Crank Voltage

2

--

--

Not Used

Fuse Block - Underhood C5 (UNH/UNJ/UNR)


Object Number: 1567051  Size: CH

Connector Part Information

  • OEM: 6098-4787
  • Service: 88988653
  • Description: 8-Way F (WH)

Terminal Part Information

  • Terminal/Tray: 15304711/8
  • Core/Insulation Crimp: 2/A
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Fuse Block - Underhood C5 (UNH/UNJ/UNR)

Pin

Wire Color

Circuit No.

Function

1

RD

9

Park Lamp Supply Voltage (UNH)

2

L-BU

--

Accessory Voltage (UNR)

3

RD

--

Battery Positive Voltage (UNJ)

4

--

--

Not Used

5

D-BU

--

Battery Positive Voltage (UNR)

6-8

--

--

Not Used