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 - I/P Label
Connector 4: Fuse Block - I/P Front View
Connector 5: Fuse Block - I/P Bottom View
Connector 6: Fuse Block - I/P Rear View
Connector 7: Fuse Block - I/P X1
Connector 8: Fuse Block - I/P X2
Connector 9: Fuse Block - I/P X3
Connector 10: Fuse Block - I/P X4
Connector 11: Fuse Block - I/P X5
Connector 12: Fuse Block - I/P X6
Connector 13: Fuse Block - I/P X7
Connector 14: Fuse Block - I/P X8
Connector 15: Fuse Block - I/P X9
Connector 16: Fuse Block - I/P X10
Connector 17: Fuse Block - I/P X11
Connector 18: Fuse Block - I/P X12
Connector 19: Fuse Block - I/P X13
Connector 20: Fuse Block - I/P X14
Connector 21: Fuse Block - I/P X15
Connector 22: Relay Block - I/P Front View
Connector 23: Junction Block - I/P Center
Connector 24: Junction Block - I/P Left X1
Connector 25: Junction Block - I/P Left X2
Connector 26: Junction Block - I/P Right X1
Connector 27: Junction Block - I/P Right X2

Fuse Block - Underhood Label


Object Number: 2147574  Size: LF

Fuse Block - Underhood Label Usage

Device

Rating

Description

ABS NO. 1 Fuse

50A

Electronic Brake Control Module (EBCM)

ABS NO. 3 Fuse

30A

Electronic Brake Control Module (EBCM)

ALT Fuse

120A

Generator

ALT-S Fuse

7.5A

Generator

AMP Fuse

30A

Audio Amplifier

AM2 Fuse

30A

Ignition Switch, Starter Relay

AM2 No. 2 Fuse

7.5A

Ignition Switch

CDS FAN Fuse

30A

FAN NO. 3 Relay

DOME Fuse

10A

Clock, Courtesy/Reading Lamps, Dome Lamp, Remote Control Door Lock Receiver

ECU-B Fuse

10A

ACC CUT relay, Combination Meter Assembly

ECU-B2 Fuse

10A

HVAC Control Module, Theft Deterrent Module

EFI MAIN Fuse

20A

EFI MAIN Relay, Powertrain Control Module (PCM)

EFI No. 1 Fuse

10A

Evaporative Emissions Canister Vent Solenoid, Heated Oxygen Sensor Bank 1 Sensor 2, Mass Air Flow (MAF) Sensor, Powertrain Control Module (PCM)

EFI No. 2 Fuse

10A

Evaporative Emissions Canister Purge Solenoid Valve, Heated Oxygen Sensor Bank 1 Sensor 1

EPS Fuse

60A

Power Steering Control Module (PSCM)

ETCS Fuse

10A

Powertrain Control Module (PCM)

H-LP LH HI Fuse

10A

Headlamp - High Beam - Left

H-LP LH LO Fuse

10A

Headlamp - Low Beam - Left

H-LP MAIN Fuse

50A

Dimmer Relay, H-LP Relay

H-LP RH HI Fuse

10A

Headlamp - High Beam - Right

H-LP RH LO Fuse

10A

Headlamp - Low Beam - Right

HORN Fuse

10A

Horn Relay

HTR Fuse

50A

HTR Relay

HTR SUB NO. 1

30A

HTR SUB NO. 1 Relay

HTR SUB NO. 3

30A

HTR SUB NO. 3 Relay

IG2 Fuse

15A

IG2 Relay

IG2 No. 2 Fuse

7.5A

IG2 Relay

PWR OUTLET/INVERTER Fuse

15A

Power Outlet Relay

RAD No. 1 Fuse

15A

Radio

RDI FAN Fuse

40A

FAN NO. 1 Relay

TURN-HAZ Fuse

10A

Turn Signal Flasher Module

Fuse Block - Underhood Top View


Object Number: 2048618  Size: LF

Fuse Block - I/P Label


Object Number: 2047744  Size: LF

Fuse Block - I/P Label Usage

No.

Device

Rating

Description

1

--

--

Not Used

2

HTR-IG Fuse

10A

HVAC Control Module

3

WIPER Fuse

25A

Windshield Wiper Motor, Windshield Wiper Switch

4

RR WIPER Fuse

15A

Rear Window Wiper Motor, Rear Window Washer Fluid Pump

5

WASHER Fuse

15A

Windshield Washer Fluid Pump

6

ECU-IG No. 1 Fuse

10A

Body Control Module (BCM)

7

ECU-IG No. 2 Fuse

10A

Backup Lamp Switch (M/T), Generator, Park Neutral Position (PNP) Switch (A/T)

8

OBD Fuse

7.5A

Data Link Connector (DLC)

9

STOP Fuse

10A

Stoplamp Switch

10

--

--

Not Used

11

DOOR Fuse

25A

Body Control Module (BCM)

12

--

--

Not Used

13

4WD Fuse

7.5A

Transfer Case Control Module

14

FR FOG Fuse

15A

FR Fog Relay

15

AM1 Fuse

10A

Ignition Switch

16

TAIL Fuse

10A

Combination Meter Assembly, License Lamp - Left, License Lamp - Right, Park Lamp - Left Front, Park Lamp - Right Front, Powertrain Control Module (PCM), Tail Lamp - Left, Tail Lamp - Right

17

PANEL Fuse

7.5A

Automatic Transmission Shift Level, Driver Information Center (DIC), Cigar Lighter, Hazard Switch, HVAC Control Module, Radio, Steering Wheel Control Switch - Left, Steering Wheel Control Switch - Right

18

--

--

Not Used

19

FR DOOR Fuse

20A

Power Window Switch - Driver, Sunroof Module

20

RL DOOR Fuse

20A

Power Window Switch - Left Rear

21

RR DOOR Fuse

20A

Power Window Switch - Right Rear

22

SUNROOF Fuse

20A

Sunroof Module

23

CIG Fuse

15A

Cigar Lighter

24

ACC Fuse

7.5A

Clock, Body Control Module (BCM)

25

--

--

Not Used

26

MIR HTR Fuse

10A

Powertrain Control Module (PCM)

27-29

--

--

Not Used

30

IGN Fuse

7.5A

Fuel Pump Relay, Powertrain Control Module (PCM), Stoplamp Switch, Theft Deterrent Module, Inflatable Restraint Passenger Presence Module, Inflatable Restraint Sensing and Diagnostic Module (SDM)

31

METER Fuse

7.5A

Combination Meter Assembly

Fuse Block - I/P Front View


Object Number: 2047740  Size: LF

No.

Device

Rating

Description

1

FLASHER Relay

--

 

2

HTR Relay

--

HTR Relay

3

IG1 Relay

--

 

4

POWER Fuse

30A

 

5

DEF Fuse

30A

 

Fuse Block - I/P Bottom View


Object Number: 2147575  Size: LF

Fuse Block - I/P Rear View


Object Number: 2047743  Size: LF

No.

Description

1

Body Control Module (BCM)

Fuse Block - I/P X1


Object Number: 2043524  Size: CH

Connector Part Information

  • OEM: 90980-12385
  • Service: N/A
  • Description: 30-Way F

Fuse Block - I/P X1

Pin

Wire

Circuit

Function

1

1 PK

--

Ignition Voltage

2

--

--

Not Used

3

1.25 BG

--

Left Rear Door Lock Motor Lock Control

4

1.25 D-GN

--

Left Rear Door Lock Motor Unlock Control

5-6

--

--

Not Used

7

0.35 L-GN

--

Liftgate Ajar Switch Signal

8

1 BK

--

Ignition Voltage

9

0.5 D-BU

--

Stoplamp Control

10

0.35 D-GN

--

--

11

--

--

Not Used

12

0.5 D-GN

--

Stoplamp Control

13-18

--

--

Not Used

19

1 BG

--

Ignition Voltage

20

--

--

Not Used

21

0.5 VT

--

Driver Door Ajar Switch Signal

22-24

--

--

Not Used

25

1 VT

--

Ignition Voltage

26

--

--

Not Used

27

0.5 YE

--

Left Turn Signal Lamp Control

28

0.5 L-BU

--

Right Turn Signal Lamp Control

29

0.35 D-GN

--

Park Lamp Control

30

0.5 RD

--

Backup Lamp Control

Fuse Block - I/P X2


Object Number: 2043523  Size: CH

Connector Part Information

  • OEM: 90980-12383
  • Service: N/A
  • Description: 36-Way F

Fuse Block - I/P X2

Pin

Wire

Circuit

Function

1

--

--

Not Used

2

0.85 D-BU

--

Windshield Washer Pump Control

3-8

--

--

Not Used

9

0.3 BK

--

Ignition Voltage

10

0.3 BK

--

Fuel Pump Relay Control

11

1.25 BK

--

Ignition Voltage

12

0.85 D-BU

--

Stop Lamp Control

13

0.3 RD/D-GN

--

Battery Positive Voltage

14

0.5 YE

--

Left Turn Signal Lamp Control

15

0.5 D-GN

--

Park Lamp Control

16

--

--

Not Used

17

0.5 RD

--

Backup Lamp Control

18

0.85 WH

--

Battery Positive Voltage

19

0.5 D-GN

--

Ignition Voltage

20

--

--

Not Used

21

0.5 D-BU/WH

--

Stop Lamp Control

22

--

--

Not Used

23

0.5 PK

--

Low Speed Serial Data

24

0.3 D-BU/BK

--

Ignition Voltage

25

0.3 WH/D-BU

--

Battery Positive Voltage

26-27

--

--

Not Used

28

0.3 L-GN

--

Horn Relay Control

29

--

--

Not Used

30

0.5 WH

--

Battery Positive Voltage

31

0.5 D-BU/RD

--

Right Turn Signal Lamp Control

32

0.5 D-GN

--

--

33

0.5 D-GN

--

Park Lamp Control

34

0.5 YE

--

Charge Indicator Control

35

--

--

Not Used

36

2 D-BU

--

Ignition Voltage

Fuse Block - I/P X3


Object Number: 2043519  Size: CH

Connector Part Information

  • OEM: 90980-11973
  • Service: N/A
  • Description: 18-Way F

Fuse Block - I/P X3

Pin

Wire

Circuit

Function

1-3

--

--

Not Used

4

0.22 VT

--

Lock Switch Signal

5

0.22 BG

--

--

6

0.35 D-BU

--

--

7

0.22 BK

--

Driver Door Key Switch Lock Signal

8

1.25 BG

--

Driver Door Lock Motor Lock Control

9

1.25 D-GN

--

Right Rear Door Lock Motor Unlock Control

10

1 YE

--

Ignition Voltage

11

2 WH

--

Ignition Voltage

12

0.35 RD

--

Battery Positive Voltage

13

0.22 VT

--

Lock Switch Signal

14

0.22 BG

--

Unlock Switch Signal

15

0.22 D-BU

--

Passenger Door Key Switch Unlock Signal

16

0.22 BK

--

Passenger Door Key Switch Lock Signal

17

1.25 BG

--

Right Rear Door Lock Motor Lock Control

18

1.25 D-GN

--

Passenger Door Lock Motor Unlock Control

Fuse Block - I/P X4


Object Number: 820196  Size: CH

Connector Part Information

  • OEM: 90980-11911
  • Service: N/A
  • Description: 14-Way F

Fuse Block - I/P X4

Pin

Wire

Circuit

Function

1

0.35 WH/BK

--

Ground

2

--

--

Not Used

3

0.35 D-BU

--

Right Turn Signal Lamp Control

4-7

--

--

Not Used

8

0.35 VT

--

Vehicle Speed Sensor Signal

9

0.35 BN

--

Battery Positive Voltage

10

0.35 YE

--

Left Turn Signal Lamp Control

11

--

--

Not Used

12

0.35 D-BU

--

Unlock Warning Switch Signal

13

--

--

Not Used

14

0.35 GY

--

Ignition Voltage

Fuse Block - I/P X5


Object Number: 820225  Size: CH

Connector Part Information

  • OEM: 90980-12094
  • Service: N/A
  • Description: 16-Way F (WH)

Fuse Block - I/P X5

Pin

Wire

Circuit

Function

1

--

--

Not Used

2

0.35 WH

--

--

3

--

--

Not Used

4

0.35 D-GN

--

Low Speed Serial Data

5

0.35 BG

--

Park Brake Switch Signal

6

0.35 RD

--

Driver Door Ajar Switch Signal

7

--

--

Not Used

8

0.35 VT

--

Vehicle Speed Sensor Signal

9

--

--

Not Used

10

0.35 WH

--

--

11-13

--

--

Not Used

14

0.35 WH

--

--

15

0.35 BK

--

Ignition Voltage

16

0.35 YE

--

Charge Indicator Control

Fuse Block - I/P X6


Object Number: 2043520  Size: CH

Connector Part Information

  • OEM: 90980-12384
  • Service: N/A
  • Description: 32-Way F

Fuse Block - I/P X6

Pin

Wire

Circuit

Function

1

0.35 VT

--

Vehicle Speed Sensor Signal

2

--

--

Not Used

3

0.35 D-GN

--

Park Lamp Control

4

0.35 BN

--

Battery Positive Voltage

5

0.35 L-GN

--

Horn Relay Control

6-7

--

--

Not Used

8

0.35 D-GN

--

Low Speed Serial Data

9-13

--

--

Not Used

14

0.5 WH/BK

--

Ground

15

--

--

Not Used

16

0.5 BK

--

Ignition Voltage

17

2 WH/BK

--

Ground

18

--

--

Not Used

19

0.35 YE

--

Right Rear Door Ajar Switch Signal

20

0.35 BG

--

Passenger Door Ajar Switch Signal

21

0.35 BK

--

Ignition Voltage

22

--

--

Not Used

23

0.35 D-BU

--

Unlock Warning Switch Signal

24-25

--

--

Not Used

26

0.35 D-BU

--

Unlock Warning Switch Signal

27

--

--

Not Used

28

0.5 WH/BK

--

Ground

29

--

--

Not Used

30

0.5 WH/BK

--

Ground

31

0.35 WH

--

Low Speed Serial Data

32

--

--

Not Used

Fuse Block - I/P X7


Object Number: 334472  Size: CH

Connector Part Information

  • OEM: 90980-11013
  • Service: N/A
  • Description: 4-Way F

Fuse Block - I/P X7

Pin

Wire

Circuit

Function

1

2 WH/BK

--

Ground

2

1.25 D-BU

--

Ignition Voltage

3-4

--

--

Not Used

Fuse Block - I/P X8


Object Number: 334470  Size: CH

Connector Part Information

  • OEM: 90980-11686
  • Service: N/A
  • Description: 8-Way F (WH)

Fuse Block - I/P X8

Pin

Wire

Circuit

Function

1

0.35 RD

--

Battery Positive Voltage

2

2 BK

--

Rear Window Defogger Control

3

0.35 D-GN

--

Ignition Voltage

4

0.75 YE

--

Ignition Voltage

5

2 D-BU

--

Ignition Voltage

6

--

--

Not Used

7

3 BN

--

Blower Motor Control

8

--

--

Not Used

Fuse Block - I/P X9


Object Number: 2043522  Size: CH

Connector Part Information

  • OEM: 90980-11775
  • Service: N/A
  • Description: 1-Way F

Fuse Block - I/P X9

Pin

Wire

Circuit

Function

1

15 WH

--

Battery Positive Voltage

Fuse Block - I/P X10


Object Number: 2043521  Size: CH

Connector Part Information

  • OEM: 90980-11259
  • Service: N/A
  • Description: 1-Way F

Fuse Block - I/P X10

Pin

Wire

Circuit

Function

1

3 D-BU

--

Battery Positive Voltage

Fuse Block - I/P X11


Object Number: 335024  Size: CH

Connector Part Information

  • OEM: 90980-10797
  • Service: N/A
  • Description: 6-Way F (BK)

Fuse Block - I/P X11

Pin

Wire

Circuit

Function

1

0.35 WH/BK

--

Ground

2

0.35 GY

--

Courtesy Lamp Control

3-4

--

--

Not Used

5

0.35 PK

--

Battery Positive Voltage

6

1 OG

--

Battery Positive Voltage

Fuse Block - I/P X12


Object Number: 428545  Size: CH

Connector Part Information

  • OEM: 90980-11539
  • Service: N/A
  • Description: (WH)

Fuse Block - I/P X12

Pin

Wire Color

Function

1

GN/WH

Stop Lamp Switch Voltage

2

GN

Park Lamp Supply Voltage

3

RD/WH

Door Open Indicator Supply Voltage

4

BU/WH

Battery Positive Voltage

5

BK/WH

Ignition Positive Voltage - Ignition Switch

6

--

Not Used

7

BU

Windshield Wiper Supply Voltage

8

WH

Ignition Positive Voltage - I/P Cluster

9

GN/YE

Right Turn Lamp - Supply Voltage

10

BK

Defogger Relay Control

11

BK/WH

Ground

Fuse Block - I/P X13


Object Number: 820109  Size: CH

Connector Part Information

  • OEM: 90980-11583
  • Service: N/A
  • Description: (WH)

Fuse Block - I/P X13

Pin

Wire Color

Function

1

BK

Starter Supply Voltage

2

BK/WH

Heater Relay Supply Voltage

3

BK/RD

Battery Positive Voltage

4

BK

Rear Defogger Supply Voltage

5

BK

Heater Relay Supply Voltage

6

BK

Battery Positive Voltage - Ignition Switch Supply Voltage

Fuse Block - I/P X14


Object Number: 1304417  Size: CH

Connector Part Information

  • OEM: 90980-11923
  • Service: N/A
  • Description:10-Way F (WH)

Fuse Block - I/P X14

Pin

Wire Color

Function

1-5

--

Not Used

6

0.35 D-GN

Illumination (+)

7

0.35 D-GN

Instrument Panel Dimming Voltage

8

0.35 D-GN

Instrument Panel Dimming Voltage

9

0.35 D-GN

Instrument Panel Lamps Dimming Low Control

10

0.35 D-GN

Steering Wheel Controls - Radio - Dimming Signal

Fuse Block - I/P X15


Object Number: 334469  Size: CH

Connector Part Information

  • OEM: 90980-11542
  • Service: N/A
  • Description:13-Way F (WH)

Fuse Block - I/P X15

Pin

Wire Color

Function

1

--

Not Used

2

0.35 D-Gn

Instrument Panel Dimming Voltage

3

0.75 GY

Ignition Voltage

4

--

Not Used

5

0.35 GY

Blower Motor Low Control

6

0.35 D-GN

Battery Positive Voltage

7

0.35 D-GN

Battery Positive Voltage

8

--

Not Used

9

0.35 D-GN

Battery Positive Voltage

10

0.35 RD

Ignition Voltage

11

--

Not Used

12

0.35 BG

Defroster Relay Control

13

--

Not Used

Relay Block - I/P Front View


Object Number: 2147581  Size: LF

No.

Device

Rating

Description

1

ST Relay

--

Starter

2

FR FOG Relay

--

Fog Lamp - Left Front, Fog Lamp - Right Front, and Daytime Running Lights (DRL) Module

3

INVERTER Relay

--

Accessory Power Inverter Module

4

ACC Relay

--

ACC Fuse and CIG Fuse

5

ACC CUT Relay

--

Ignition Switch

Junction Block - I/P Center


Object Number: 2037171  Size: CH

Connector Part Information

  • OEM: 90980-12585
  • Service: N/A
  • Description: N/A

Junction Block - I/P Center

Pin

Wire

Circuit

Function

1-2

0.35 D-BU

--

--

3

0.35 RD

--

--

4

--

--

Not Used

5

0.35 GY

--

--

6-8

--

--

Not Used

9

0.5 WH/BK

--

--

10

0.35 WH/BK

--

--

11

0.35 D-BU

--

--

12

0.35 BK

--

IGNITION

13

0.35 RD

--

--

14

--

--

Not Used

15-16

0.35 YE

--

--

17

0.35 GY

--

--

18

--

--

Not Used

19

0.5 WH/BK

--

--

20

0.35 WH/BK

--

--

21-28

--

--

Not Used

29

0.35 WH/BK

--

--

30-35

--

--

Not Used

36

0.35 YE

--

--

37-46

--

--

Not Used

47

0.35 D-GN

--

--

48

0.35 L-GN

--

Horn Relay Control

49-51

--

--

Not Used

52

0.35 BK

--

IGNITION

53

0.35 RD

--

--

54

--

--

Not Used

55

0.35 WH

--

--

56-57

--

--

Not Used

58

0.35 L-GN

--

Horn Relay Control

59-60

--

--

Not Used

61

0.35 D-BU

--

--

62

--

--

Not Used

63

0.35 RD

--

--

64

0.35 PK

--

--

65-69

--

--

Not Used

70

0.35 WH/BK

--

--

71

0.35 D-BU

--

--

72

0.35 BK

--

IGNITION

73

0.35 YE

--

--

74

0.35 PK

--

--

75

--

--

Not Used

76

0.35 OG

--

HAZARD

77

--

--

Not Used

78

0.35 L-GN

--

HORN

79-80

0.35 WH/BK

--

--

81

0.35 D-BU

--

--

82

--

--

Not Used

83

0.35 YE

--

--

84

0.35 PK

--

--

85

--

--

Not Used

86

0.35 OG

--

HAZARD

87-89

--

--

Not Used

90

0.35 WH/BK

--

--

91

0.35 D-BU

--

--

92

--

--

Not Used

93-94

0.35 YE

--

--

95

0.35 WH

--

--

96

0.35 OG

--

HAZARD

97

0.35 D-GN

--

--

98

--

--

Not Used

99-100

0.35 WH/BK

--

--

Junction Block - I/P Left X1


Object Number: 820121  Size: CH

Connector Part Information

  • OEM: 90980-11661
  • Service: N/A
  • Description: WH

Junction Block - I/P Left X1

Pin

Wire

Circuit

Function

1

--

--

Not Used

2

0.3 WH

--

--

0.5 WH

--

--

3-4

0.3 BK

--

IGNITION

5-6

0.85 D-BU

--

--

7

--

--

Not Used

8

0.3 D-BU/BK

--

--

9

0.3 D-BU/BK

--

--

10-12

--

--

Not Used

Junction Block - I/P Left X2


Object Number: 820121  Size: CH

Connector Part Information

  • OEM: 90980-11661
  • Service: N/A
  • Description: WH

Junction Block - I/P Left X2

Pin

Wire

Circuit

Function

1

--

--

Not Used

2

0.5 D-BU

--

--

3

--

--

Not Used

4

0.3 BK

--

IGNITION

5

0.3 WH

--

--

6

0.5 WH

--

--

7-9

0.5 WH/BK

--

--

10

--

--

Not Used

11-12

0.5 D-BU/BK

--

--

Junction Block - I/P Right X1


Object Number: 820121  Size: CH

Connector Part Information

  • OEM: 90980-11661
  • Service: N/A
  • Description: WH

Junction Block - I/P Right X1

Pin

Wire

Circuit

Function

1-4

--

--

Not Used

5-6

2.0 RD

--

--

7

--

--

Not Used

8-9

0.5 D-GN

--

--

10-12

--

--

Not Used

Junction Block - I/P Right X2


Object Number: 820121  Size: CH

Connector Part Information

  • OEM: 90980-11661
  • Service: N/A
  • Description: WH

Junction Block - I/P Right X2

Pin

Wire

Circuit

Function

1

--

--

Not Used

2

2.0 RD

--

--

3-11

--

--

Not Used

12

0.5 D-GN

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