GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM) C1
Table 2: Body Control Module (BCM) C2
Table 3: Body Control Module (BCM) C3
Table 4: Body Control Module (BCM) C4
Table 5: Body Control Module (BCM) C5 (UE1 or U2K)

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

--

--

Not Used

2

OG

840

Battery Positive Voltage (2.0L)

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)

8-17

--

--

Not Used

18

GY

120

Fuel Pump Supply Voltage

19

D-GN/WH

465

Fuel Pump Relay Control

20

OG

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

OG

40

Battery Positive Voltage

3

OG

240

Battery Positive Voltage

4

--

--

Not Used

5

BN

9

Park Lamp Supply Voltage (T82)

6

OG

840

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 or MU3)

11

PK

339

Ignition 1 Voltage

12

--

--

Not Used

13

OG

52

Blower Motor Supply Voltage

14

BN

41

Ignition 3 Voltage

15

BN

141

Ignition 3 Voltage

16

--

--

Not Used

17

OG

1040

Battery Positive Voltage

18

OG

1440

Battery Positive Voltage

19-20

--

--

Not Used

21

OG

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 (2.2L w/K34)

29

YE

343

Accessory Voltage

30

--

--

Not Used

31

OG

52

Blower Motor Supply Voltage

32

OG

52

Blower Motor Supply Voltage

33

YE

1139

Ignition 1 Voltage

34

--

--

Not Used

35

PK

1539

Ignition 1 Voltage

36-37

--

--

Not Used

38

OG

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

OG

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

OG

1732

Inadvertent Power Supply Voltage (2.2L)

13

OG

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 (Sedan)

22

L-BU

395

Passenger Door Jamb Switch Signal (Sedan)

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/JL9)

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 (2.2L)

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 (T82)

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

PU

1807

BCM Class 2 Serial Data

19

PU

1807

BCM Class 2 Serial Data

20

PU

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 (T82)

24-26

--

--

Not Used

27

BK/WH

151

Ground

28

PU

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 (T37)

32

YE

317

Fog Lamp Relay Coil Supply Voltage (T37)

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

PU/WH

549

Headlamp Switch Headlamps Off Signal (T82)

38

--

--

Not Used

39

PU/WH

1572

Traction Control Indicator Control (NW7)

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 (NW7)

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

Low Beam Switched Ground

48

WH/BK

1073

5-Volt Reference

49

GY

728

Security Indicator Control

50

L-GN/BK

1137

DRL Ambient Light Sensor Signal 5V (T82)

51

--

--

Not Used

52

OG

192

Front Fog Lamp Switch Signal (T37)

53

WH

1390

Off/Run/Crank Voltage

54

--

--

Not Used

55

YE/BK

1138

DRL Ambient Light Sensor Low Reference (T82)

56

--

--

Not Used

Body Control Module (BCM) C5 (UE1 or U2K)


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

OG

1340

Battery Positive Voltage

B-C

--

--

Not Used

D

PU

1807

Class 2 Serial Data (UE1)

E-F

--

--

Not Used