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
Table 6: Body Control Module (BCM) - C6

Body Control Module (BCM) - C1


Object Number: 40446  Size: CH

Connector Part Information

    • 12177194
    • 6-Way F Metri-Pack 150 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A

RED

2353

Instrument Panel Lamps Dimming Supply Voltage

B

PPL/WHT

1382

LED Dimming Signal

C

ORN

4040

Battery Positive Voltage

D

ORN

1732

Inadvertent Power Courtesy Lamps Supply Voltage

E

BRN/WHT

230

Instrument Panel Lamps Dimming Control

F

ORN

2240

Battery Positive Voltage

Body Control Module (BCM) - C2


Object Number: 73156  Size: CH

Connector Part Information

    • 12110088
    • 24-Way F Micro-Pack 100 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

DK BLU

1796

Steering Wheel Radio Controls Supply Voltage

A3

TAN/BLK

254

Rear Door Unlock Relay Control

A4

PNK/WHT

1970

Headlamp Low Beam Relay Control

A5

DK GRN/

WHT

1317

Fog Lamp Relay Control

A6

GRY/BLK

255

Rear Door Lock Relay Control

A7

--

--

Not Used

A8

WHT

193

Rear Defog Relay Control

A9-A10

--

--

Not Used

A11

RED/WHT

812

12 Volt Reference

A12

ORN

1140

Battery Positive Voltage

B1

BLK/WHT

1969

Headlamp High Beam Relay Control

B2

WHT

1080

Park Lamp Relay Control

B3

DK BLU

1353

RAP Supply Voltage

B4

LT GRN/BLK

592

DRL Relay Control

B5

PPL

359

DRL Off Indicator Control

YEL

1977

Rear Fog Lamp Relay Control (Export)

B6

BLK/WHT

1851

Ground

B7

BLK

1835

Security System Sensor Low Reference

B8

PNK

1348

Headlamp On Indicator Control

B9

BLK

28

Horn Relay Control

B10

--

--

Not Used

B11

GRY

1056

Dimmer Switch 5 Volt Reference Voltage

B12

LT GRN

1037

BCM Class 2 Serial Data

Body Control Module (BCM) - C3


Object Number: 255037  Size: CH

Connector Part Information

    • 12160778
    • 24-Way F Micro-Pack 100 Series (BRN)

Pin

Wire Color

Circuit No.

Function

A1-A3

--

--

Not Used

A4

WHT

278

Ambient Light Sensor Signal

A5

--

--

Not Used (w/o CJ2)

GRY

1548

Passenger Sunload Sensor Signal (w/ CJ2)

A6

YEL

1836

Security System Sensor Signal

--

--

Not Used (Export)

A7

LT GRN

1011

Remote Radio Control Signal

A8

DK GRN

588

DRL Switch Signal

A9

ORN

192

Front Fog Lamp Switch Signal

A10

--

--

Not Used

A11

PPL

328

Interior Lamp Defeat Switch Signal

A12

--

--

Not Used

B1

YEL

710

Class 2 Serial Data

B2

GRY/BLK

308

Park Lamp Switch Signal

B3-B4

--

--

Not Used

B5

--

--

Not Used (w/o CJ2)

LT BLU/

BLK

590

Driver Sunload Sensor Signal (w/ CJ2)

B6

BLK/WHT

1851

Ground

B7

LT BLU

1059

Steering Wheel Position Sensor Signal (NYS, JL4)

B8

ORN/BLK

2090

Dimming Switch Signal

B9

LT GRN

11

Headlamp Dimmer Switch Signal

B10

LT BLU

187

Rear Fog Lamp Indicator Control (Export)

--

--

Not Used

B11

LT BLU

553

Tow/Haul Switch Signal

B12

--

--

Not Used

Body Control Module (BCM) - C4


Object Number: 130690  Size: CH

Connector Part Information

    • 12110206
    • 24-Way F Micro-Pack 100 Series (LT BLU)

Pin

Wire Color

Circuit No.

Function

A1

LT GRN

80

Key In Ignition Switch Signal

A2

YEL

307

Headlamp Switch Flash to Pass Signal

A3

WHT

530

Off/Run/Crank Voltage

A4

PNK

39

Ignition 1 Voltage

A5

--

--

Not Used

A6

DK BLU/

WHT

149

Cargo Lamp Low Control (Avalanche/Escalade EXT)

--

--

Not Used

A7

LT BLU

1134

Park Brake Switch Signal

A8

GRY

1524

Backup Lamp Signal

A9-A11

--

--

Not Used

A12

WHT

103

Headlamp Switch Headlamps On Signal

B1-B2

--

--

Not Used

B3

YEL

43

Accessory Voltage

B4-B5

--

--

Not Used

B6

GRY/BLK

2226

Instrument Panel Lamps Dimmer Switch Low Reference

B7

BLK

279

Ambient Light Sensor Low Reference

B8

--

--

Not Used

B9

DK BLU/WHT

1495

Courtesy Lamps On Signal

B10-B12

--

--

Not Used

Body Control Module (BCM) - C5


Object Number: 304345  Size: CH

Connector Part Information

    • 12177195
    • 6-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A-C

--

--

Not Used

D

ORN

2140

Battery Positive Voltage

E

GRY/BLK

690

Courtesy Lamp Control

F

LT GRN

24

Backup Lamp Supply Voltage

Body Control Module (BCM) - C6


Object Number: 362758  Size: CH

Connector Part Information

    • 12191375
    • 16-Way F Micro-Pack 100 Series (PPL)

Pin

Wire Color

Circuit No.

Function

A1

PNK/BLK

1303

Liftgate Ajar Switch Signal (ZW9)

A2

LT GRN/

BLK

748

Right Rear Door Ajar Switch Signal

A3

LT BLU/

BLK

747

Left Rear Door Ajar Switch Signal

A4

--

--

Not Used

A5

LT BLU

2265

Power Window Lockout Left Rear Control

A6

LT GRN

2266

Power Window Lockout Right Rear Control

A7

GRY/BLK

1186

Power Window Relay Right Rear Up Control

A8

DK GRN

1188

Power Window Relay Right Rear Down Control

B1

LT BLU

2380

Rear Parking Assist Chime Signal

B2-B6

--

--

Not Used

B7

YEL

1187

Power Window Relay Left Rear Down Control

B8

WHT

1185

Power Window Relay Left Rear Up Control