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

Body Control Module (BCM) C1


Object Number: 1243543  Size: CH

Connector Part Information

    • 638277-3
    • 52-Way F AMP (BK)

Pin

Wire Color

Circuit Number

Function

1

BK

860

Front Windshield Wiper Switch High Signal

2

WH

1459

Security System Sensor Supply Voltage

3

PK

1439

Ignition 1 Voltage

4

BK

28

Horn Relay Control

5

--

--

Not Used

6

BK

707

RAP Relay Control

7

BK/WH

1969

Headlamp High Beam Relay Control

8

D-GN/WH

1317

Fog Lamp Relay Control

9

PK/WH

1970

Headlamp Low Beam Relay Control

10

WH

1080

Park Lamp Relay Control

11

YE

749

Security Indicator Control

12

GY

91

Windshield Wiper Switch Signal 2

13

YE

196

Windshield Wiper Motor Park Switch Signal

14

BK

1835

Security System Sensor Low Reference

15

L-GN/BK

1137

DRL Ambient Light Sensor Signal

16

L-GN

526

Stop Lamp Switch Signal

17

BK

1750

Ground

18-19

--

--

Not Used

20

BK

1950

Ground

21

YE

5

Crank Voltage

22

PK

1239

Ignition 1 Voltage

23

BN

1141

Ignition 3 Voltage

24

TN

185

Low Washer Fluid Indicator Signal

25

WH/BK

644

12 Volt Reference

26

--

--

Not Used

27

GY

598

10 Volt Reference

28

BK

552

Low Reference

29

BN/WH

230

I/P Dimming Return

30

PK

1444

I/P Dimming Control

31

RD/WH

812

I/P Dimming Voltage Reference

32-33

--

--

Not Used

34

BN/WH

1571

Traction Control Switch Signal

35

--

--

Not Used

36

PK/BK

1597

Courtesy Lamps Switch On Signal

37

BK/WH

1455

Keyless Entry Program Enable Signal

38

L-GN

1037

BCM Class 2 Serial Data

39

WH

17

Stop Lamp Switch Signal

40

L-GN

80

Key In Ignition Switch Signal

41

L-BU/WH

1314

Left Front Turn Signal Lamp Supply Voltage

42

D-BU/WH

1315

Right Front Turn Signal Lamp Supply Voltage

43

GY/BK

690

Courtesy Lamp Supply Voltage

44

OG

1732

Inadvertant Power Courtesy Lamp

45

--

--

Not Used

46

OG

340

Battery Positive Voltage

47

RD

228

Windshield Washer Pump Control

48

GY

8

Instrument Panel Lamp Supply Voltage

49

D-GN/WH

1135

A/T Shift Lock Control Solenoid Supply Voltage

50

OG

240

Battery Positive Voltage

51

OG

2440

Battery Positive Voltage

52

OG

1240

Battery Positive Voltage

Body Control Module (BCM) C2


Object Number: 1243543  Size: CH

Connector Part Information

    • 638277-1
    • 52-Way F AMP (BK)

Pin

Wire Color

Circuit Number

Function

1

--

--

Not Used

2

RD/BK

780

Driver Door Lock Switch Lock Signal

3

RD/BK

744

Rear Compartment Lid Ajar Switch

4

D-BU

245

Passenger Door Lock Switch Unlock Signal

5

L-GN/BK

748

Right Rear Door Ajar Switch Signal

6

YE/BK

1181

Right Rear Door Open Switch Signal

7

L-BU/BK

747

Left Rear Door Ajar Switch Signal

8

L-GN

1177

Right Front Door Open Switch Signal

9

OG/BK

233

Park Brake Switch Signal

10

--

--

Not Used

11

OG/BK

781

Driver Door Lock Switch Unlock Signal

12-14

--

--

Not Used

15

L-BU

263

Tamper Switch Signal

16

WH

193

Rear Defog Relay Control

17

BK/WH

746

Right Front Door Ajar Switch Signal

18

D-BU/WH

1179

Left Rear Door Open Switch Signal

19-21

--

--

Not Used

22

L-GN

1123

Door Lock Key Switch Lock Signal

23

--

--

Not Used

24

PU

1124

Door Lock Key Switch Unlock Signal

25

TN

126

Left Front Door Open Switch Signal

26

GY/BK

745

Left Front Door Ajar Switch Signal

27-29

--

--

Not Used

30

WH

17

Stop Lamp Switch Signal

31

L-BU

244

Passenger Door Lock Switch Lock Signal

32-34

--

--

Not Used

35

YE

2080

Driver Heated Seat Cushion Temperature Sensor Low Reference (KA1)

36

PK

2435

Passenger Heated Seat Cushion Temperature Sensor Low Reference (KA1)

37

YE/BK

2079

Heated Seat Cushion Temperature Sensor Signal (KA1)

38

GY

2434

Passenger Heated Seat Cushion Temperature Sensor Signal (KA1)

39

TN/WH

2430

Passenger Heated Seat Relay Control (KA1)

40

PU

2477

Driver Heated Seat Relay Control (KA1)

41

--

--

Not Used

42

L-GN

24

Backup Lamp Supply Voltage

43

YE

18

Left Rear Stop/Turn Lamp Supply Voltage

44

GY

8

Instrument Panel Lamp Supply Voltage

45

L-BU

1344

Trunk Release Control

46

TN

694

Driver Door Lock Actuator Unlock Control

47

--

--

Not Used

48

D-GN

19

Right Rear Stop/Turn Lamp Supply Voltage

49

OG

440

Battery Positive Voltage

50

BK

550

Ground

51

TN

294

Door Lock Actuator Unlock Control

52

GY

295

Door Lock Actuator Lock Control

Body Control Module (BCM) C3


Object Number: 1243603  Size: CH

Connector Part Information

    • 638397-1
    • 18-Way F AMP (BK)

Pin

Wire Color

Circuit Number

Function

1-3

--

--

Not Used

4

L-BU/WH

1414

Left Turn Signal Switch Signal

5

L-BU

1714

Windshield Wiper Switch Low Signal

6

L-GN

696

Cruise Control Cancel Signal

7

WH

103

Headlamp Switch Headlamps On Signal

8

BN/WH

301

Park Lamp Switch On Signal

9

BN

738

Horn Switch Signal

10

L-BU

1872

Exterior Lamps Off Input

11

OG

192

Front Fog Lamp Switch Signal

12

PU

524

Headlamp Dimmer Switch High Beam Signal

13

PK

94

Windshield Washer Switch Signal

14

BN

1356

Flash To Pass Switch Signal

15

BK/WH

1251

Ground

16

TN

2144

Hazard Switch Signal

17

D-BU/WH

1415

Right Turn Signal Switch Signal

18

L-GN

1715

Windshield Wiper Switch High Signal