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: 255037  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1

BLK

1850

Ground

A2

ORN

1140

Battery Positive Voltage

A3

WHT

194

Door Unlock Control

A4

LT BLU

195

Door Lock Control

A5

BRN

1295

Variable Effort Steering Actuator Control

A6

WHT

1294

Variable Effort Steering Actuator Supply Voltage

A7

BLK

755

RAP Relay Coil Control

A8

DK BLU

1393

Inadvertent Power Relay Control

A9

BLK

28

Horn Relay Control

A10

--

--

Not Used

A11

LT GRN/

BLK

592

DRL Relay Control

A12

LT GRN

1037

BCM Class 2 Serial Data

B1

BLK

1850

Ground

B2

PNK

39

Ignition 1 Voltage

B3

RED/WHT

812

12 Volt Reference

B4

ORN

461

GMCM Serial Data

B5

GRY

705

5 Volt Reference

B6

LT BLU

14

Left Turn Signal Lamps Supply Voltage

B7

DK BLU

15

Right Turn Signal Lamps Supply Voltage

B8

--

--

Not Used

B9

BRN

41

Ignition 3 Voltage

B10

LT BLU

1134

Park Brake Switch Signal

B11

BLK/WHT

238

Seat Belt Switch - Left

B12

LT BLU

553

Tow/Haul Switch Signal

Body Control Module (BCM) - C2


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

YEL

710

Class 2 Serial Data

A2

ORN/BLK

1057

Low Reference

A3

GRY/BLK

690

Courtesy Lamp Relay Control

A4

LT GRN

1391

Left Front Door Lock Relay Control

A5

WHT

1080

Park Lamp Relay Control

A6

--

--

Not Used

A7

DK GRN/

WHT

1317

Fog Lamp Relay Control

A8

DK GRN

1655

Exterior Courtesy Lamps Relay Control

A9-A10

--

--

Not Used

A11

WHT

352

Headlamp Relay Coil Supply Voltage

A12

PPL/WHT

1382

LED Dimming Signal

B1

DK GRN/

WHT

817

Vehicle Speed Signal

B2

LT BLU

1059

Steering Wheel Position Sensor Signal

B3

YEL

1836

Security System Sensor Signal

B4

--

--

Not Used

B5

PPL

524

Headlamp Dimmer Switch High Beam Signal

B6

BRN

2409

Interior Park Lamps Supply Voltage

B7-B8

--

--

Not Used

B9

LT GRN

80

Key In Ignition Switch Signal

B10

PNK/BLK

1303

RAP Fuse Supply Voltage

B11

DK BLU/

WHT

727

Secondary Door Latch Switch Signal

B12

ORN

1732

Courtesy Lamps Supply Voltage

Body Control Module (BCM)-C3


Object Number: 362758  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1

DK BLU/

WHT

149

Cargo Lamp Low Control

A2

DK BLU/

WHT

1495

Interior Lamp Control

A3

BRN

1356

Flash to Pass Switch Signal

A4

GRY

705

5 Volt Reference

A5

GRY

8

Instrument Panel Lamp Supply Voltage - 1

A6

WHT

278

Ambient Light Sensor Signal

A7-A8

--

--

Not Used

B1

--

--

Not Used

B2

LT GRN/

BLK

394

Left Front Door Handle Switch Signal

B3

LT GRN

262

Driver Door Key Switch Signal

B4

TAN

126

Left Front Door Open Switch Signal

B5

ORN

192

Front Fog Lamp Switch Signal

B6

PPL

328

Interior Lamp Defeat Switch Signal

B8

--

--

Not Used