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: 73156  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

WHT

2282

Headlamp Washer Relay Control (w/CE4)

A3

ORN

1140

Battery Positive Voltage

A4

BLK/WHT

1969

Headlamp High Beam Relay Control

A5

PNK/WHT

1970

Headlamp Low Beam Relay Control

A6-A11

--

--

Not Used

A12

WHT

278

Ambient Light Sensor Signal

B1

LT GRN

1037

BCM Class 2 Serial Data

B2

BLK

279

Ambient Light Sensor Low Reference

B3

LT GRN

2270

Rear Window Washer Relay Control

B4

GRY/BLK

2226

Low Reference

B5

GRY

705

5 Volt Reference

B6

WHT

2283

Rear Wiper/Washer Switch Supply Voltage

B7

ORN/BLK

2090

Courtesy Lamps Supply Voltage

B8

LT GRN

1011

Remote Radio Control Signal

B9

GRY

391

Rear Window Wiper Switch Signal

B10

YEL

1836

Security System Sensor Signal

B11

GRY

2521

Right Sunload Sensor Signal

B12

LT BLU/BLK

2519

Left Sunload Sensor Signal

Body Control Module (BCM) C2


Object Number: 646417  Size: CH

Connector Part Information

    • 12110112
    • 32-Way F Micro-Pack 100 (TAN)

Pin

Wire Color

Circuit No.

Function

E1-E2

--

--

Not Used

E3

LT GRN

80

Key In Ignition Switch Signal

E4

YEL

307

Headlamp Switch Flash to Pass Signal

E5

GRY/BLK

308

Park Lamp Switch Signal

E6

PNK/BLK

109

Hood Ajar Switch Signal (Export Only)

E7

PNK

1348

Headlamp On Indicator Control

E8

BLK

1835

Security System Sensor Low Reference

E9

RED/WHT

812

12 Volt Reference

E10

--

--

Not Used

E11

DK GRN/

WHT

1317

Fog Lamp Relay Control

E12

BLK

28

Horn Relay Control

E13-E16

--

--

Not Used

F1-F2

--

--

Not Used

F3

DK GRN

113

Windshield Wiper Switch Signal 2

F4

DK BLU/

WHT

1495

Courtesy Lamps On Signal

F5

BRN/WHT

1871

Headlamp Washer Switch Signal (w/CE4)

F6

ORN

192

Front Fog Lamp Switch Signal

F7

LT BLU

187

Rear Fog Lamp Switch Signal

F8

--

--

Not Used

F9

WHT

103

Headlamp Switch Headlamps On Signal

F10

LT GRN

11

Headlamp High Beam Supply Voltage

F11

PPL

328

Interior Lamp Defeat Switch Signal

F12-F13

--

--

Not Used

F14

YEL

710

Class 2 Serial Data

F15-F16

--

--

Not Used

Body Control Module (BCM) C3


Object Number: 697009  Size: CH

Connector Part Information

    • 15077187
    • 40-Way Flat Wire

Pin

Wire Color

Circuit No.

Function

A1

--

--

Battery Positive Voltage

A2

--

--

Not Used

A3

--

--

Right Rear Door Ajar Switch Signal

A4

--

--

Park Brake Switch Signal

A5

--

--

Door Lock Relay Control

A6

--

--

Power Window Lockout Left Rear Control

A7

--

--

Not Used

A8

--

--

Left Rear Door Ajar Switch Signal

A9-A10

--

--

Not Used

A11

--

--

Ground

A12

--

--

RAP Relay Supply Voltage

A13

--

--

Door Unlock Relay Control

A14

--

--

Park Lamp Relay Control

A15-A17

--

--

Not Used

A18

--

--

Ignition 0 Voltage

A19

--

--

Battery Positive Voltage

A20

--

--

Ignition 3 Voltage

B1

--

--

Instrument Panel Lamps Dimming Control

B2

--

--

Instrument Panel Lamps Dimming Control

B3

--

--

Courtesy Lamp Supply Voltage

B4

--

--

Battery Positive Voltage

B5

--

--

Power Window Switch Right Rear Up Signal

B6

--

--

Power Window Lockout Right Rear Control

B7

--

--

Power Window Switch Right Rear Down Signal

B8

--

--

Power Window Switch Left Rear Up Signal

B9

--

--

Power Window Switch Left Rear Down Signal

B10

--

--

Not Used

B11

--

--

Ground

B12

--

--

Backup Lamp Supply Voltage

B13

--

--

Battery Positive Voltage

B14

--

--

LED Dimming Supply

B15

--

--

Accessory Voltage

B16

--

--

Not Used

B17

--

--

Battery Positive Voltage

B18

--

--

Courtesy Lamps Supply Voltage

B19

--

--

Rear Fog Lamp Relay and Indicator Control

B20

--

--

Not Used