GM Service Manual Online
For 1990-2009 cars only
Table 1: Fuse Block - Underhood Label Usage
Table 2: Fuse Block - Underhood C1
Table 3: Fuse Block - Underhood C2
Table 4: Fuse Block - Underhood C3
Table 5: Body Control Module (BCM) Label Usage
Table 6: Body Control Module (BCM) C1
Table 7: Body Control Module (BCM) C2
Table 8: Body Control Module (BCM) C3
Table 9: Body Control Module (BCM) C4
Table 10: Body Control Module (BCM) C5 (UE1)

Fuse Block - Underhood Label


Object Number: 892846  Size: MF

Fuse Block - Underhood Label Usage

No.

Fuse

Rating

Description

1

ECM/TCM Fuse

10A

TCM and ECM

2-3

--

--

Not Used

4

RH HDLP Fuse

15A

Headlamp-Right

5

A/C Fuse

10A

A/C Relay

6-7

--

--

Not Used

8

ABS2 Fuse

10A

EBCM (JM4)

9

ECM Fuse

10A

ECM

10

ERLS Fuse

10A

EVAP Canister Purge Solenoid, EVAP Canister Vent Solenoid, Coolant Level Switch, HO2S 1, and HO2S 2

11

IGN Fuse

10A

ICM and PNP Switch

12

--

--

Not Used

13

TRANS2 Fuse

10A

Ratio Control Motor

14

TRANS1 Fuse

10A

TCM and PNP Switch (M43 or M75)

15

BACK UP Fuse

10A

PNP Switch (M43 or M75) or Backup Lamp Switch (M86)

16

INJECTORS Fuse

10A

Fuel Injectors 1-4

17

FOG Fuse

10A

FOG LAMP Relay

18

LH HDLP Fuse

15A

Headlamp-Left

19

WIPER Fuse

25A

WIPER Relay

20

HORN Fuse

10A

HORN Relay

21

PREM AUDIO

20A

Audio Amplifier (UZ6)

22

ABS1 Fuse

20A

EBCM (JM4)

23

RR DEFOG Fuse

30A

REAR DEFOG Relay

24

A/C Relay

--

A/C Compressor Clutch

25

HORN Relay

--

Horn

26

FOG LAMP Relay

--

Fog Lamps

27

--

--

Not Used

28

RUN/CRANK Relay

--

Fuse Block - Underhood ABS 2, ECM, IGN, TRANS 2, TRANS 1, BACK UP, ERLS, INJECTORS Fuses, A/C Relay, Body Control Module AIR BAG, EPS, and CRUISE Fuses

29

--

--

Not Used

30

COOLING FAN Relay

--

Cooling Fan

31

PCM CONT Relay

--

Starter

32

WIPER1 Relay

--

Wiper 2 Relay

33

WIPER2 Relay

--

Windshield Wiper Motor Assembly

34

REAR DEFOG Relay

--

Rear Window Defogger Grid

35

AC DIODE

--

36

--

--

Not Used

37

WIPER DIODE

--

38

RUN/CRANK Fuse

30A

RUN/CRANK Relay

39

IP BATT1 Fuse

30A

Body Control Module PARK, LIGHTER, DASH, BCM PWR, ONSTAR, RADIO Fuses and ACC Relay

40

ABS Fuse

40A

EBCM (JM4)

41

IP BATT2 Fuse

40A

Body Control Module FUELPUMP, STOP, CLUSTER, IGN SW, AND BCM ELECT Fuses

42

EPS 2 Fuse

30A

EPS

43

EPS 1 Fuse

30A

EPS

44

--

--

Not Used

45

COOLING FAN Fuse

30A

COOLING FAN Relay

46

CRANK Fuse

30A

PCM CONT Relay

47

IP BATT1A Fuse

30A

Body Control Module PARK, LIGHTER, DASH, BCM PWR, ONSTAR, RADIO Fuses and ACC Relay

48

RUN (IGN3) Fuse

30A

Body Control Module RUN RELAY

49

--

--

Fuse Puller

Fuse Block - Underhood Top View


Object Number: 892856  Size: MF

Fuse Block - Underhood Bottom View


Object Number: 893427  Size: MF

Fuse Block - Underhood C1


Object Number: 647949  Size: CH

Connector Part Information

    • 15319894
    • 68-Way F Metri-Pack 280 Series Flexlock (NA)

Pin

Wire Color

Circuit No.

Function

A1-A12

--

--

Not Used

B1

PK

439

Ignition 1 Voltage

B2

PK

1039

Ignition 1 Voltage (M43)

B3-B4

--

--

Not Used

B5

PK

839

Ignition 1 Voltage

B6-B12

--

--

Not Used

C1

D-GN

335

Cooling Fan Relay Control

C2-C4

--

--

Not Used

C5

PK

539

Ignition 1 Voltage

C8-C12

--

--

Not Used

D1

L-BU

409

Cooling Fan Motor Supply Voltage

D2

PK

439

Ignition 1 Voltage

D3-D4

--

--

Not Used

D5

PK

1039

Ignition 1 Voltage (M43/M75)

D8

D-GN

1433

Clutch Start Switch Signal

D9-D12

--

--

Not Used

E1

--

--

Not Used

E2

PK

439

Ignition 1 Voltage

E3

D-GN

59

A/C Compressor Clutch Supply Voltage

E4

--

--

Not Used

E5

YE

1139

Ignition 1 Voltage (M75)

E6

OR

480

Load Management Control

E7

PK

1039

Ignition 1 Voltage (M43/M75)

E8

YE

575

Starter Control

E9

PK

239

Ignition 1 Voltage

E10

L-BU

20

Stop Lamp Switch Signal (M75)

E11-E12

--

--

Not Used

F1-F5

--

--

Not Used

F6

YE

447

Starter Relay Coil Control

F7

--

--

Not Used

F8

PU

6

Starter Solenoid Crank Voltage

F9

PK

239

Ignition 1 Voltage

F10

BK

150

Ground

F11

L-GN

24

Backup Lamp Supply Voltage

F12

--

--

Not Used

Fuse Block - Underhood C2


Object Number: 647951  Size: CH

Connector Part Information

    • 15319896
    • 68-Way F Metri-Pack 280 Series Flexlock (BK)

Pin

Wire Color

Circuit No.

Function

A1-A7

--

--

Not Used

A8

YE

575

Starter Control

A9

RD

442

Battery Positive Voltage

A10

PU

293

Rear Defog Element Supply Voltage

A11

--

--

Not Used

A12

WH

193

Rear Defog Relay Control

B1

RD

242

Battery Positive Voltage

B2-B4

--

--

Not Used

B5

PK

439

Ignition 1 Voltage

B6

PK

439

Ignition 1 Voltage

B7

OR

540

Battery Positive Voltage (JM4)

B8

--

--

Not Used

B9

L-BU

20

Stop Lamp Switch Signal

B10

--

--

Not Used

B11

RD

342

Battery Positive Voltage

B12

L-GN

24

Backup Lamp Supply Voltage

C1

RD

542

Battery Positive Voltage (JM4)

C2-C4

--

--

Not Used

C5

PK

639

Ignition 1 Voltage

C8

--

--

Not Used

C9

L-GN

1715

Windshield Wiper Switch High Signal

C10-C11

--

--

Not Used

C12

L-GN

24

Backup Lamp Supply Voltage

D1

D-GN/WH

459

A/C Compressor Clutch Relay Control

D2-D4

--

--

Not Used

D5

PK

1439

Ignition 1 Voltage

D8

--

--

Not Used

D9

PU

92

Windshield Wiper Motor High Speed

D10

D-GN

95

Windshield Wiper Motor Low Speed

D11-D12

--

--

Not Used

E1

RD

142

Battery Positive Voltage

E2

--

--

Not Used

E3

OR

480

Load Management Control

E4-E6

--

--

Not Used

E7

OR

1240

Battery Positive Voltage (UZ6)

E8

--

--

Not Used

E9

L-BU

20

Stop Lamp Switch Signal

E10

YE

317

Fog Lamp Relay Coil Supply Voltage

E11

--

--

Not Used

E12

L-BU

14

Left Turn Signal Lamps Supply Voltage

F1

D-BU

338

Run/Crank Voltage

F2

BN

9

Park Lamp Supply Voltage

F3

PK

3

Ignition 1 Voltage

F4

PK

1200

Headlamp High Beam Signal

F5

BK

28

Horn Relay Control

F6-F7

--

--

Not Used

F8

D-BU

1201

Headlamp Low Beam Signal

F9

D-GN

113

Windshield Wiper Switch Signal 2

F10

BK

150

Ground

F11

RD

228

Windshield Washer Pump Control

F12

D-BU

15

Right Turn Signal Lamps Supply Voltage

Fuse Block - Underhood C3


Object Number: 899002  Size: CH

Connector Part Information

    • 15394135
    • 54-Way F Metri-Pack 280 Series Flexlock (GY)

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

BN

9

Park Lamp Supply Voltage (Coupe)

A3

--

--

Not Used

A4

PK

1200

Headlamp High Beam Signal

A5

D-GN

29

Horn Control

A6-A9

--

--

Not Used

A10

BK

150

Ground

A11

--

--

Not Used

A12

D-BU

15

Right Turn Signal Lamp Supply Voltage

B1

--

--

Not Used

B2

BN

9

Park Lamp Supply Voltage

B3-B5

--

--

Not Used

B8

D-BU

1201

Headlamp Low Beam Signal

B9

--

--

Not Used

B10

D-BU

1201

Headlamp Low Beam Signal

B11

RD

228

Windshield Washer Pump Control

B12

--

--

Not Used

C1

--

--

Not Used

C2

BN

9

Park Lamp Supply Voltage

C3-C5

--

--

Not Used

C8-C10

--

--

Not Used

C11

PK

1200

Headlamp High Beam Signal

C12

PU

34

Fog Lamps Supply Voltage

D1

--

--

Not Used

D2

BN

9

Park Lamp Supply Voltage (Coupe)

D3-D5

--

--

Not Used

D8

OR

740

Battery Positive Voltage

D9-D10

--

--

Not Used

D11

L-BU

14

Left Turn Signal Lamp Supply Voltage

D12

PU

34

Fog Lamps Supply Voltage

E1-E4

--

--

Not Used

E5

OR

640

Battery Positive Voltage

E6-E12

--

--

Not Used

Body Control Module (BCM) Label


Object Number: 893810  Size: MF

Body Control Module (BCM) Label Usage

Fuse

Rating

Description

AIR BAG Fuse

10A

SDM

ALC/PARK Relay

--

Marker/Park Lamps

ACC Relay

--

Body Control Module PWR OUTLET, PWR WINDOWS, WIPER SW, SUN ROOF, and RADIO (ACC.) Fuses

BCM ELECT Fuse

7.5A

BCM

BCM (PWR) Fuse

15A

BCM and Rear Compartment Lid Release Switch

CLUSTER Fuse

7.5A

IPC

CRUISE Fuse

7.5A

ECM, CCM (K34), and Clutch Start Switch (M86)

DASH Fuse

7.5A

BCM

EPS Fuse

2A

EPS Assembly and Steering Wheel Controls-Left (K34)

FUELPUMP Fuse

15A

Body Control Module FUEL PUMP Relay

FUEL PUMP Relay

--

Fuel Pump

HVAC Fuse

7.5A

HVAC Control Assembly

IGN SW Fuse

2A

Ignition Switch

LIGHTER Fuse

15A

Cigar Lighter and DLC

ONSTAR Fuse

10A

VCIM (UE1)

PARK Fuse

15A

ALC/PARK Relay and Turn Signal/Multifunction Switch

PWR OUTLET Fuse

15A

Auxiliary Power Outlet

PWR WINDOWS Fuse

30A

Window Switch-Driver (A31) and Window Switch-Front Passenger(A31)

RADIO (ACC.) Fuse

10A

Radio

RADIO (BATT 1)

10A

Radio

RUN Relay

--

HVAC Control Assembly and Body Control Module HVAC Fuse

STOP Fuse

15A

Stop Lamp Switch-Upper

SUN ROOF Fuse

15A

Inside Rearview Mirror and Sunroof Switch (CF5)

WIPER SW Fuse

10A

Windshield Wiper/Washer Switch and Ignition Lock Cylinder Control Solenoid (M43 or M75)

Body Control Module (BCM) Top View


Object Number: 893858  Size: MF

Body Control Module (BCM) Bottom View


Object Number: 893862  Size: MF

Body Control Module (BCM) C1


Object Number: 878462  Size: CH

Connector Part Information

    • 1326143-2
    • 37-Way F AMP (BK)

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

YE

243

Accessory Voltage

4

YE

443

Accessory Voltage

5

D-BU

1307

Power Window Master Switch Lockout Control (Sedan)

6

D-BU

1307

Power Window Master Switch Lockout Control (Sedan w/A31)

7

D-BU

1307

Power Window Master Switch Lockout Control (Sedan w/A31)

8-16

--

--

Not Used

17

OR

1140

Battery Positive Voltage

18

GY

120

Fuel Pump Supply Voltage

19

D-GN/WH

465

Fuel Pump Relay Control

20

OR

1140

Battery Positive Voltage

21

RD

142

Battery Positive Voltage

22

RD

442

Battery Positive Voltage

23

BN

441

Ignition 3 Voltage (A31)

24

--

--

Not Used

25

PK

1200

Headlamp High Beam Signal

26

L-BU

20

Stop Lamp Switch Signal

27

L-BU

20

Stop Lamp Switch Signal

28

L-BU

20

Stop Lamp Switch Signal

29

L-BU

20

Stop Lamp Switch Signal

30

L-BU

20

Stop Lamp Switch Signal

31

--

--

Not Used

32

PK

3

Ignition 1 Voltage

33

--

--

Not Used

34

RD

342

Battery Positive Voltage

35-36

--

--

Not Used

37

RD

242

Battery Positive Voltage

Body Control Module (BCM) C2


Object Number: 878463  Size: CH

Connector Part Information

    • 1326143-1
    • 38-Way F AMP (GY)

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

OR

40

Battery Positive Voltage

3

OR

240

Battery Positive Voltage

4

--

--

Not Used

5

BN

9

Park Lamp Supply Voltage

6

OR

1340

Battery Positive Voltage

7

PK

1200

Headlamp High Beam Signal

8

L-BU

20

Stop Lamp Switch Signal

9

--

--

Not Used

10

PK

339

Ignition 1 Voltage (M86)

11

PK

339

Ignition 1 Voltage

12

--

--

Not Used

13

OR

52

Blower Motor Supply Voltage

14

BN

41

Ignition 3 Voltage

15

BN

141

Ignition 3 Voltage

16

--

--

Not Used

17

OR

1040

Battery Positive Voltage

18

OR

1440

Battery Positive Voltage

19-20

--

--

Not Used

21

OR

40

Battery Positive Voltage

22

YE

143

Accessory Voltage

23

YE

143

Accessory Voltage (M43 or M75)

24-27

--

--

Not Used

28

PK

339

Ignition 1 Voltage

29

YE

343

Accessory Voltage

30

--

--

Not Used

31

OR

52

Blower Motor Supply Voltage

32

OR

52

Blower Motor Supply Voltage

33

YE

1139

Ignition 1 Voltage

34

--

--

Not Used

35

PK

1539

Ignition 1 Voltage

36

--

--

Not Used

37

OR

1140

Battery Positive Voltage

38

OR

140

Battery Positive Voltage

Body Control Module (BCM) C3


Object Number: 878465  Size: CH

Connector Part Information

    • 1326144-1
    • 56-Way F AMP (BK)

Pin

Wire Color

Circuit No.

Function

1

BK/WH

56

Trunk Release Motor Supply Voltage

2

TN

694

Driver Door Lock Actuator Unlock Control (AU3)

3

OR

1732

Inadvertent Power Supply Voltage

4

D-BU

338

Run/Crank Voltage

5

BN

4

Accessory Voltage

6

BN

9

Park Lamp Supply Voltage

7

BN

9

Park Lamp Supply Voltage

8

BN

9

Park Lamp Supply Voltage

9

BN

9

Park Lamp Supply Voltage

10

RD

228

Windshield Washer Pump Control

11

WH

156

Courtesy Lamp Low Control

12

OR

1732

Inadvertent Power Supply Voltage

13

OR

1732

Inadvertent Power Supply Voltage (DG7)

14

--

--

Not Used

15

D-GN

113

Windshield Wiper Switch Signal 2

16

--

--

Not Used

17

YE/BK

68

Low Coolant Level Indicator Signal

18

BK/WH

151

Ground (Sedan)

19

--

--

Not Used

20

BK/WH

151

Ground (Sedan)

21

L-BU

395

Passenger Door Jamb Switch Signal

22

L-BU

395

Passenger Door Jamb Switch Signal

23

YE

196

Windshield Wiper Motor Park Switch Signal

24

--

--

Not Used

25

PK

849

Brake Fluid Level Sensor Signal

26

PU

1807

BCM Class 2 Serial Data (JM4)

27

PU

1807

BCM Class 2 Serial Data

28-32

--

--

Not Used

33

WH

682

Driver Door Lock Actuator Unlock Control (AU3)

34

WH

682

Driver Door Lock Actuator Unlock Control (AU3)

35

D-GN

146

Trunk Ajar Indicator Control (AU3)

36-38

--

--

Not Used

39

WH

193

Rear Defog Relay Control

40

BK

28

Horn Relay Control

41

YE

317

Fog Lamp Relay Coil Supply Voltage

42

--

--

Not Used

43

YE

18

Left Turn Signal Lamps Supply Voltage

44

L-BU

14

Left Turn Signal Lamp Supply Voltage

45

D-GN

19

Right Turn Signal Lamps Supply Voltage

46

D-BU

15

Right Turn Signal Lamp Supply Voltage

47

BK

650

Ground

48

GY

295

Door Lock Actuator Lock Control (Sedan w/AU3)

49

GY

295

Door Lock Actuator Lock Control (Sedan w/AU3)

50

GY

295

Door Lock Actuator Lock Control (AU3)

51

GY

295

Door Lock Actuator Lock Control (AU3)

52

TN

294

Door Lock Actuator Unlock Control (AU3)

53

TN

294

Door Lock Actuator Unlock Control (Sedan w/AU3)

54

--

--

Not Used

55

TN

294

Door Lock Actuator Unlock Control (Sedan w/AU3)

56

D-BU

1201

Headlamp Low Beam Signal

Body Control Module (BCM) C4


Object Number: 878468  Size: CH

Connector Part Information

    • 1326144-2
    • 56-Way F AMP (GY)

Pin

Wire Color

Circuit No.

Function

1

RD

228

Windshield Washer Pump Control

2

BN

9

Park Lamp Supply Voltage

3

--

--

Not Used

4

BN

9

Park Lamp Supply Voltage

5

BN

9

Park Lamp Supply Voltage

6

BN

4

Accessory Voltage

7

D-BU

338

Run/Crank Voltage

8

--

--

Not Used

9

BN/WH

230

Instrument Panel Lamps Dimming Control

10

--

--

Not Used

11

YE

18

Left Turn Signal Lamps Supply Voltage

12

D-GN

19

Right Turn Signal Lamps Supply Voltage

13

GY

8

Instrument Panel Lamps Supply Voltage

14

GY

8

Instrument Panel Lamps Supply Voltage

15

GY

8

Instrument Panel Lamps Supply Voltage

16

GY

8

Instrument Panel Lamps Supply Voltage

17

GY

8

Instrument Panel Lamps Supply Voltage (NW7)

18

VT

1807

BCM Class 2 Serial Data

19

VT

1807

BCM Class 2 Serial Data

20

VT

1807

BCM Class 2 Serial Data

21

--

--

Not Used

22

L-GN

66

A/C Request Signal

23

PK/WH

1970

Headlamp Low Beam Relay Control

24-26

--

--

Not Used

27

BK/WH

151

Ground

28

VT

719

Low Reference

29

--

--

Not Used

30

GY

8

Instrument Panel Lamps Supply Voltage (M43 or M75)

31

GY

8

Instrument Panel Lamps Supply Voltage

32

YE

317

Fog Lamp Relay Coil Supply Voltage

33

BK

28

Horn Relay Control

34

BN

323

Shift Lock Solenoid Supply Voltage (M43 or M75)

35

--

--

Not Used

36

WH

193

Rear Defog Relay Control

37

VT/WH

549

Headlamp Switch Headlamps Off Signal

38

--

--

Not Used

39

PU/WH

1572

Traction Control Indicator Control (JM4)

40

L-BU

1508

Turn/Hazard Switch Supply Voltage

41

GY

112

Windshield Wiper Switch Signal 1

42

BN/WH

1571

Traction Control Switch Signal (JM4)

43

L-BU

1134

Park Brake Switch Signal

44

L-BU

395

Passenger Door Jamb Switch Signal

45

L-GN/BK

394

Driver Door Jamb Switch Signal

46

L-BU

292

Rear Defog Switch Signal

47

D-BU

1201

Headlamp Low Beam Signal

48

WH/BK

1073

5 Volt Reference

49

GY

728

Security Indicator Control

50

L-GN/BK

1137

DRL Ambient Light Sensor Signal 5 Volt

51

--

--

Not Used

52

OR

192

Front Fog Lamp Switch Signal

53

WH

1390

Off/Run/Crank Voltage

54

--

--

Not Used

55

YE/BK

1138

DRL Ambient Light Sensor Low Reference

56

--

--

Not Used

Body Control Module (BCM) C5 (UE1)


Object Number: 886347  Size: CH

Connector Part Information

    • 12193928
    • 6-Way F Metri-Pack 280 Series Flexlock (GY)

Pin

Wire Color

Circuit No.

Function

A

OR

1340

Battery Positive Voltage

B-C

--

--

Not Used

D

VT

1807

Class 2 Serial Data

E-F

--

--

Not Used