GM Service Manual Online
For 1990-2009 cars only
Connector 1: Fuse Block - Underhood Label
Connector 2: Fuse Block - Underhood Bottom View
Connector 3: Fuse Block - Underhood X1
Connector 4: Fuse Block - Underhood X2
Connector 5: Fuse Block - Underhood X3
Connector 6: Fuse Block - Underhood X4
Connector 7: Fuse Block - I/P Top View
Connector 8: Fuse Block - I/P Wire Entry

Fuse Block - Underhood Label


Object Number: 1861860  Size: MF

Fuse Block - Underhood Label Usage

No.

Fuse

Rating

Description

EF1

HVAC BLWR Fuse

30A

Blower Relay

EF2

BCM BATT Fuse

60A

Body Control Module (BCM) (ISU)

EF3

ABS Fuse

60A

Electronic Brake Control Module (EBCM)

EF4

IGN1 Fuse

30A

Ignition Switch

EF5

PWR WIDW Fuse

20A

Power Window/Door Lock Switch - Driver

EF6

COOL FAN HI Fuse

20A

Cooling Fan High Relay

EF7

COOL FAN LOW Fuse

20A

Cooling Fan Low Relay

EF8

ST/IG2 Fuse

30A

Ignition Switch, STARTER Relay

EF9

SPARE Fuse

15A

SPARE

EF10

SPARE Fuse

10A

SPARE

EF11

SPARE Fuse

20A

SPARE

EF12

SPARE Fuse

25A

SPARE

EF13

SPARE Fuse

30A

SPARE

EF14

ABS WARNING Fuse

10A

Not Used

EF15

S/ROOF Fuse

20A

Sunroof Module

EF16

ABS Fuse

15A

ABS Oil Feeding Connector, Electronic Brake Control Module (EBCM)

EF17

HVAC BLWR Fuse

15A

Headlamp - Left, Headlamp - Right

EF18

DRIVER'S PWR WIDW Fuse

20A

Window Motor - Driver (ABZ)

EF19

PWR MIRROR Fuse

10A

Multifunction Switch

EF20

ILLUM RT Fuse

10A

Headlamp - Right, Tail Lamp - Right, Turn Signal/Park Lamp - RF

EF21

LCM Fuse

30A

Multifunction Control Module (MCM)

EF22

IP Fuse

25A

Fuse Block - I/P

EF23

STOP LAMPS Fuse

20A

Stop Lamp Switch

EF24

ILLUM LT Fuse

10A

Headlamp - Left, Tail Lamp - Left, Turn Signal/Park Lamp - LF

EF25

PWR SEAT Fuse

30A

Power Seat Switch, Power Seat Test Connector

EF26

FUEL Fuse

20A

Fuel Sender Assembly

EF27

ECM Fuse

15A

Engine Control Module (Gasoline), ENGINE MAIN Relay, Automatic Transmission (MH7/MH8)

EF28

IGN COIL Fuse

20A

Ignition Coil 1-6 (Gasoline)

EF29

HORN Fuse

15A

HORN Relay

EF30

ENG2 Fuse

15A

Fuel Injector 1-6 (Gasoline), Engine Control Module (Diesel), Evaporative Emissions (EVAP) Canister Purge Valve Solenoid (Gasoline), Vehicle Speed Sensor (VSS) (M/T)

EF31

ENG3 Fuse

20A

Not Used

EF32

--

--

Empty

EF33

ENG1 Fuse

15A

Exhaust Gas Recirculation (EGR) Solenoid Valve, Engine Control Module (ECM), Generator, VIM Solenoid Valve, Heated Oxygen Sensors, Camshaft Position (CMP), Mass Air Flow (MAF) Sensor, Evaporative Emissions (EVAP) Canister Vent Valve Solenoid

EF34

FRT FOG Fuse

15A

FOG LAMP Relay

EF35

LOW BEAM LT Fuse

10A

Headlamp - Left

EF36

PWR AMP Fuse

20A

Power Amplifier (U63)

EF37

LOW BEAM RT Fuse

10A

Headlamp - Right, Multifunction Switch (TR6)

EF38

--

--

Empty

EF39

A/C CMPRSR Fuse

10A

A/C COMPRESSOR Relay

--

ALTERNATOR Fuse

120A

Generator, Fuse Block - Auxiliary Underhood (Diesel)

--

A/C COMPRESSOR Relay

--

A/C Compressor Clutch, Engine Control Module (ECM)

--

COOLING FAN CONTROL Relay

--

Cooling Fan - Main

--

COOLING FAN HIGH Relay

--

Cooling Fan - Main

--

COOLING FAN LOW Relay

--

Cooling Fan - Auxiliary

--

ENGINE MAIN Relay

--

EF30 Fuse, EF31 Fuse, EF33 Fuse, A/C COMPRESSOR Relay, COOLING FAM HIGH Relay, COOLING FAN CONTROL Relay, COOLING FAN LOW Relay

--

FOG LAMP Relay

--

Front Fog Lamp - Left, Front Fog Lamp - Right

--

FUEL PUMP Relay

--

EF26 Fuse, EF28 Fuse

--

HEADLAMP HIGH Relay

--

EF17 Fuse

--

HEADLAMP LOW Relay

--

EF35 Fuse, EF37 Fuse

--

HORN Relay

--

Horn High, Horn Low, Horn Switch

--

ILLUMINATION Relay

--

EF20 Fuse, EF24 Fuse

--

POWER WINDOW Relay

--

EF18 Fuse, EF5 Fuse, EF19 Fuse

--

STARTER Relay

--

Starter

Fuse Block - Underhood Bottom View


Object Number: 1999026  Size: MF

Fuse Block - Underhood X1


Object Number: 647951  Size: CH

Connector Part Information

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

Fuse Block - Underhood X1

Pin

Wire

Circuit

Function

A1-A3

--

--

Not Used

A4

D-GN/WH

711

Left Headlamp High Beam Supply Voltage

L-GN/BK

311

Right Headlamp High Beam Supply Voltage

A5-A9

--

--

Not Used

A10

D-GN

189

Headlamp Leveling Motor Supply Voltage (TR6)

D-GN

189

Headlamp Leveling Motor Supply Voltage (TR6)

A11-A12

--

--

Not Used

B1-B4

--

--

Not Used

B5

D-GN

59

A/C Compressor Clutch Supply Voltage

B6-B7

--

--

Not Used

B8

D-BU

15

Right Turn Signal Lamp Supply Voltage

B9

RD/WH

340

Battery Positive Voltage

B10

--

--

Not Used

B11

L-BU

14

Left Turn Signal Lamp Supply Voltage

B12

--

--

Not Used

C1

L-BU

409

Cooling Fan Motor Supply Voltage (1)

C2-C3

--

--

Not Used

C4

YE

196

Windshield Wiper Motor Park Switch Signal

C5

PU

34

Front Fog Lamp Supply Voltage

PU

34

Front Fog Lamp Supply Voltage

C6-C7

--

--

Not Available

C8-C10

--

--

Not Used

C11

WH

504

Cooling Fan Motor Low Reference (Gasoline)

L-BU

409

Cooling Fan Motor Supply Voltage (1) (Diesel)

C12

--

--

Not Used

D1

L-BU

409

Cooling Fan Motor Supply Voltage (1) (Diesel)

D2

PU

709

Left Park Lamp Supply Voltage

D3

BN/WH

309

Right Park Lamp Supply Voltage

D4

--

--

Not Used

D5

BN/WH

312

Right Headlamp Low Beam Supply Voltage

BN/WH

312

Right Headlamp Low Beam Supply Voltage (TR6/TQE)

D6-D7

--

--

Not Available

D8

BN/WH

312

Right Headlamp Low Beam Supply Voltage (TR6)

D9

BK

250

Ground (Gasoline)

YE

5358

Cooling Fan Motor Supply Voltage (3) (Diesel)

D10-D11

--

--

Not Used

D12

YE

261

Arm Alarm Signal

E1

RD/WH

340

Battery Positive Voltage

E2-E4

--

--

Not Used

E5

YE

712

Left Headlamp Low Beam Supply Voltage

E6-E9

--

--

Not Used

E10

PK/BK

109

Hood Ajar Switch Signal

E11

GY

532

Cooling Fan Motor Supply Voltage (2)

E12

OG

228

Windshield Washer Pump Control

F1-F5

--

--

Not Used

F6

D-GN

29

Horn Control

D-GN

29

Horn Control

F7

--

--

Not Used

F8

L-GN/BK

735

Outside Ambient Air Temperature Sensor Signal (C68)

F9

--

--

Not Used

F10

YE

61

Outside Ambient Temperature Sensor Low Reference (C68)

F11

GY

532

Cooling Fan Motor Supply Voltage (2) (Diesel)

F12

YE

712

Left Headlamp Low Beam Supply Voltage (w/o TR6)

BN/WH

312

Right Headlamp Low Beam Supply Voltage (TQE)

Fuse Block - Underhood X2


Object Number: 684889  Size: CH

Connector Part Information

  • OEM: 15319895
  • Service: N/A
  • Description: 68-Way F Metri-Pack 280 Flexlock Series (GY)

Fuse Block - Underhood X2

Pin

Wire

Circuit

Function

A1

D-GN

335

Low Speed Cooling Fan Relay Control

A2

PK

1846

Supply Voltage

PK

1846

Supply Voltage (LBM)

A3

--

--

Not Used

A4

PK

1846

Supply Voltage (LBK)

PK

1846

Supply Voltage (LBK)

A5

PK

1846

Supply Voltage (LBK/LBM)

PK

1846

Supply Voltage (LBK/LBM)

A6

PU/WH

67

A/C Compressor Clutch Coil Supply Voltage

A7

--

--

Not Used

A8

L-GN/BK

735

Outside Ambient Air Temperature Sensor Signal (C68)

A9

--

--

Not Used

A10

YE

61

Outside Ambient Temperature Sensor Low Reference (C68)

A11

D-BU

473

High Speed Cooling Fan Relay Control

A12

YE

712

Left Headlamp Low Beam Supply Voltage

B1

RD/WH

440

Battery Positive Voltage

B2

PK

1846

Supply Voltage

B3-B4

--

--

Not Used

B5

PK

1846

Supply Voltage

PK

1846

Supply Voltage (LBK/LBM)

PK/WH

1846

Supply Voltage (LLW)

B6-B9

--

--

Not Used

B10

PK

--

Ignition 1 Voltage

B11

--

--

Not Used

B12

D-BU

1885

Service Vehicle Soon Indicator Control (LBK/LBM)

PU/WH

1885

Service Vehicle Soon Indicator Control (LLW)

C1

--

--

Not Used

C2

PK

1846

Supply Voltage (LBM)

PK/WH

1846

Supply Voltage (LLW)

C3

BN

5069

Engine Main Relay Coil Control (LBK/LBM)

GY/BK

5069

Engine Main Relay Coil Control (LLW)

C4-C5

--

--

Not Used

C6-C7

--

--

Not Available

C8

D-GN/WH

762

A/C Request Signal

C9

--

--

Not Used

C10

PK

--

Ignition 1 Voltage

C11

PK

539

Run/Crank Ignition 1 Voltage (LBK/LBM)

PK/BK

539

Run/Crank Ignition 1 Voltage (LLW)

C12

--

--

Not Used

D1

BN/WH

6281

Fuel Level Sensor Low Reference

D2

PK

1846

Supply Voltage (LBK/LBM)

D3-D4

--

--

Not Used

D5

PK

139

Run/Crank Ignition 1 Voltage

D6-D7

--

--

Not Available

D8

--

--

Not Used

D9

D-GN/WH

465

Fuel Pump Primary Relay Control

D10

PK

539

Run/Crank Ignition 1 Voltage (LBK/LBM)

D11-D12

--

--

Not Used

E1

PU

6

Starter Solenoid Crank Voltage

E2

YE

30

Fuel Level Sensor Signal (LBK/LBM)

E3

PK

139

Run/Crank Ignition 1 Voltage (LBK/LBM)

PK/BK

139

Run/Crank Ignition 1 Voltage (LLW)

E4

PK/BK

--

Run/Crank Ignition 1 Voltage (LLW)

E5

--

--

Not Used

E6

PK

139

Run/Crank Ignition 1 Voltage (LBK/LBM)

PK/BK

139

Run/Crank Ignition 1 Voltage (LLW)

E7-E10

--

--

Not Used

E11

PK

539

Run/Crank Ignition 1 Voltage (LBK/LBM)

BK/WH

--

Ground (LLW)

E12

--

--

Not Used

F1

OG/BK

1786

Transmission Park/Neutral Signal (1) (M98/MH7/MH8)

BK

350

Ground (MFB/MFN)

F2

D-GN

135

Engine Coolant Temperature Gauge Signal

F3

--

--

Not Used

F4

L-GN

24

Backup Lamp Supply Voltage (MFB/MFN)

YE

712

Left Headlamp Low Beam Supply Voltage (LBK)

F5

--

--

Not Used

F6

PK/BK

--

Run/Crank Ignition 1 Voltage (LLW)

F7-F9

--

--

Not Used

F10

PK

739

Run/Crank Ignition 1 Voltage

F11

RD/WH

440

Battery Positive Voltage

F12

WH/BK

5043

Serial Data

Fuse Block - Underhood X3


Object Number: 647949  Size: CH

Connector Part Information

  • OEM: 15319894
  • Service: N/A
  • Description: 68-Way F Metri-Pack 280 Flexlock Series (NA)

Fuse Block - Underhood X3

Pin

Wire

Circuit

Function

A1

YE

5

Crank Voltage

A2

D-GN

135

Engine Coolant Temperature Gauge Signal

A3

BN/WH

99

Windshield Washer Fluid Level Sensor Signal

A4

L-GN

24

Backup Lamp Supply Voltage (MFB/MFN)

A5

D-GN/WH

1317

Fog Lamp Relay Control

A6

BN

28

Horn Relay Control

A7

--

--

Not Used

A8

OG

340

Battery Positive Voltage

A9

--

--

Not Used

A10

GY

120

Fuel Pump Supply Voltage

A11

--

--

Not Used

A12

OG/BK

740

Battery Positive Voltage

B1-B4

--

--

Not Used

B5

PU

709

Left Park Lamp Supply Voltage

B6

PK

539

Run/Crank Ignition 1 Voltage

B7

OG

540

Battery Positive Voltage

B8-B9

--

--

Not Used

B10

RD/BK

242

Battery Positive Voltage

B11

RD/WH

1340

Battery Positive Voltage

B12

--

--

Not Used

C1

--

--

Not Used

C2

OG

55

Fuel Gauge Signal

C3

WH

1080

Park Lamp Relay Control

C4

--

--

Not Used

C5

BN/WH

309

Right Park Lamp Supply Voltage

C6-C7

--

--

Not Available

C8

D-GN/WH

762

A/C Request Signal

C9

BN

1739

Run/Crank Ignition 1 Voltage

C10-C11

--

--

Not Used

C12

OG

1580

Fuel Pump Low Reference

D1

--

--

Not Used

D2

BN

189

Headlamp Leveling Motor Supply Voltage (TR6)

D3-D4

--

--

Not Used

D5

D-GN/BK

1798

Low Reference

D6-D7

--

--

Not Available

D8

L-GN

312

Right Headlamp Low Beam Supply Voltage (TR6)

D9

PK/BK

109

Hood Ajar Switch Signal

D10

PK

539

Run/Crank Ignition 1 Voltage

PK

539

Run/Crank Ignition 1 Voltage

D11

YE

261

Arm Alarm Signal

D12

--

--

Not Used

E1

BN

41

Run Ignition 3 Voltage

E2

D-BU/WH

1885

Service Vehicle Soon Indicator Control

E3-E4

--

--

Not Used

E5

PK

1339

Run/Crank Ignition 1 Voltage

PK

1339

Run/Crank Ignition 1 Voltage

E6

PK/WH

2339

Run/Crank Ignition 1 Voltage

E7

RD/WH

840

Battery Positive Voltage

E8-E9

--

--

Not Used

E10

L-BU

14

Left Turn Signal Lamp Supply Voltage

E11

--

--

Not Used

E12

D-GN/BK

2905

Data Communication

F1

--

--

Not Used

F2

PU

1589

Primary Fuel Level Sensor Signal

F3

RD/WH

140

Headlamp High Beam Relay Control

F4

RD/BK

642

Battery Positive Voltage

F5-F9

--

--

Not Used

F10

D-BU

15

Right Turn Signal Lamp Supply Voltage

F11

PK/D-BU

638

Power Window Enable Relay Control

F12

OG

228

Windshield Washer Pump Control

OG

228

Windshield Washer Pump Control (CE1)

Fuse Block - Underhood X4


Object Number: 1243665  Size: CH

Connector Part Information

  • OEM: 15447740
  • Service: N/A
  • Description: 8-Way F Metri-Pack 800 Series (BK)

Fuse Block - Underhood X4

Pin

Wire

Circuit

Function

A1

OG

580

Battery Positive Voltage

A2

RD/BK

742

Battery Positive Voltage

B1

--

--

Not Used

B2

RD

142

Battery Positive Voltage

C1

--

--

Not Used

C2

RD

42

Battery Positive Voltage

D1

--

--

Not Used

D2

RD/WH

1642

Battery Positive Voltage

Fuse Block - I/P Top View


Object Number: 1861859  Size: MF

Fuse Block - I/P Label Usage

No.

Fuse

Rating

Description

F1

CLUSTER2 Fuse

10A

Driver Information Center (DIC), Instrument Panel Cluster (IPC), Multifunction Control Module (MCM), Park/Neutral Position (PNP) Switch (A/T), Transmission Control Module (TCM) (A/T)

F2

WIPER Fuse

25A

Rain Sensor (CE1), Windshield Wiper Motor, Windshield Wiper/Washer Switch

F3

ECU Fuse

15A

Park/Neutral Position (PNP) Switch (A/T), Transmission Control Module (TCM) (A/T)

F4

HVAC Fuse

10A

Body Control Module (BCM), Blower Relay, HVAC Control Module, Mode Actuator, Recirculation Actuator

F5

CLOCK Fuse

10A

Clock, Multifunction Control Module (MCM), Sunroof Module, Front Dome Lamp

F6

RADIO Fuse

10A

Radio

F7

HEATING MAT Fuse

20A

Heated Seat Switch - Driver, Heated Seat Switch - Passenger

F8

AUDIO Fuse

20A

Radio

F9

CLUSTER1 Fuse

10A

Clock, Driver Information Center (DIC), HVAC Control Module, Instrument Panel Cluster (IPC), Key Reminder Switch, Multifunction Control Module (MCM)

F10

SDM Fuse

10A

Inflatable Restraint Sensing and Diagnostic Module (SDM)

F11

AIR BAG Fuse

10A

Passenger Air Bag/Seat Belt Warning Lamp, Passenger Presence Detection (PPS) Sensor

F12

SPARE Fuse

10A

Instrument Panel Cluster (IPC) (MH7/MH8)

F13

LCM Fuse

10A

Multifunction Control Module (MCM) and Traction Control Switch (NW9)

F14

CIGAR Fuse

20A

Auxiliary Power Outlet and Cigar Lighter

F15

SUB WOOFER Fuse

20A

Subwoofer Speaker

F16

B/UP LP Fuse

15A

Back Up Lamp Switch (M/T), Inside Rearview Mirror, Object Detection Module, Park/Neutral Position (PNP) Switch (A/T), Shift Lever Selector, Stop Lamp Switch

F17

U/H J/B Fuse

15A

Automatic Transmission (MH7/MH8), Engine Control Module (ECM), FOG LAMP Relay, FUEL PUMP Relay, Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor

F18

ISU Fuse

25A

Body Control Module (BCM), Windshield Wiper/Washer Switch

F19

OSRVM Fuse

10A

HVAC Control Module, Outside Rearview Mirror - Driver, Outside Rearview Mirror - Passenger

F20

A/D CONVERTER Fuse

15A

Not Used

F21

SSPS Fuse

15A

Power Steering Control Module (Gasoline), Clutch Start Switch (Diesel)

F22

ALDL Fuse

15A

Data Link Connector (DLC), Rear Compartment Release Switch, Transmission Control Module (TCM) (M98)

F23

ESC Fuse

30A

Electronic Brake Control Module (F45)

Fuse Block - I/P Wire Entry


Object Number: 1501860  Size: CF

Connector Part Information

  • OEM: 936195-1
  • Service: N/A
  • Description: 76-Way F 090/250 Hybrid Series (BK)

Fuse Block - I/P Wire Entry

Pin

Wire

Circuit

Function

1-2

--

--

Not Used

3

RD/BK

242

Battery Positive Voltage

4

--

--

Not Used

5

RD/WH

1840

Battery Positive Voltage

RD/WH

1840

Battery Positive Voltage (A/T)

6

RD/WH

1840

Battery Positive Voltage

7-9

--

--

Not Used

10

PK

639

Run/Crank Ignition 1 Voltage

11

PK

639

Run/Crank Ignition 1 Voltage

12

PU/WH

1293

--

13

PK

539

Run/Crank Ignition 1 Voltage

14

PK

839

Run/Crank Ignition 1 Voltage (A/T)

PK

839

Run/Crank Ignition 1 Voltage (A/T)

15

PK

839

Run/Crank Ignition 1 Voltage (M/T)

16-18

--

--

Not Used

19

BN

141

Run Ignition 3 Voltage

20-23

--

--

Not Used

24

OG

267

Mirror Heater Element Voltage

25

PK

839

Run/Crank Ignition 1 Voltage

26-28

--

--

Not Used

29

RD/WH

1740

Battery Positive Voltage

30

--

--

Not Used

31

YE

43

Accessory Voltage (RHD)

32-34

--

--

Not Used

35

OG

300

Run Ignition 3 Voltage

36

PK

3

Run/Crank Ignition 1 Voltage

37

PK

1139

Run/Crank Ignition 1 Voltage

38

--

--

Not Used

39

RD/WH

1140

Battery Positive Voltage

40

--

--

Not Used

41

BN

4

Accessory Voltage

42-44

--

--

Not used

45

BN

141

Ignition 2 Voltage

46

PK/BK

1339

Run/Crank Ignition 1 Voltage (NW9)

47

YE

143

Accessory Voltage

48

PK/WH

2339

Run/Crank Ignition 1 Voltage

49

PK

339

Run/Crank Ignition 1 Voltage

50

PK

339

Run/Crank Ignition 1 Voltage

51-53

--

--

Not Used

54

YE

43

Accessory Voltage (LHD)

55

--

--

Not Used

56

BN

41

Run Ignition 3 Voltage

57

BN

41

Run Ignition 3 Voltage

58

--

--

Not Used

59

PK/D-BU

145

Ignition 2 Voltage

60

PK

239

Run/Crank Ignition 1 Voltage

61

PK

239

Run/Crank Ignition 1 Voltage

PK

239

Run/Crank Ignition 1 Voltage

62-63

--

--

Not Used

64

OG

40

Battery Positive Voltage

65

BN

241

Run Ignition 3 Voltage

66

YE

243

Accessory Voltage

67-68

--

--

Not Used

69

BN

41

Run Ignition 3 Voltage

70-71

--

--

Not Used

72

PK

439

Run/Crank Ignition 1 Voltage

73

PK

939

Run/Crank Ignition 1 Voltage

74

PK

939

Run/Crank Ignition 1 Voltage

75-76

--

--

Not Used