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

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

YEL

1491

Backlight Lamps Control

B

PPL/WHT

1382

LED Dimming Signal

C

ORN

4040

Battery Positive Voltage

D

ORN

1732

Inadvertent Power Supply Voltage

E

BRN/WHT

230

Instrument Panel Lamps Dimming Control

F

RED/WHT

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-A2

--

--

Not Used

A3

LT BLU

244

Passenger Door Lock Switch Lock Control (AU3) w/o PRP

A4

PNK/WHT

1970

Headlamp Low Beam Relay Control

A5

WHT

111

Hazard Switch Signal

A6

DK BLU

245

Passenger Door Lock Switch Unlock Control (AU3) w/o PRP

LT BLU

244

Access Panel Left Side Front Relay Control - w/PRP

A7

LT GRN

1391

Driver Door Unlock Relay Control (AU3) w/o PRP

LT GRN

1391

Access Panel Left Side Rear Relay Control - w/PRP

A8

LT BLU

1344

Cargo Door Release Relay Control (AU3) w/o PRP

LT BLU

1344

Access Panel Right Side Relay Control - w/PRP

A9-A10

--

--

Not Used

A11

ORN/WHT

812

12 Volt Reference

A12

RED/WHT

1140

Battery Positive Voltage

B1

TAN/WHT

1969

Headlamp High Beam Relay Control

B2

WHT

1080

Park Lamp Relay Control

B3

TAN

755

RAP Relay Coil Control (A31)

B4

LT GRN/BLK

592

DRL Low Control

B5

--

--

Not Used

B6

BLK/WHT

351

Ground

B7

TAN

1835

Security System Sensor Low Reference

B8

PNK

1348

Headlamp On Indicator Supply Voltage

B9

TAN

28

Horn Relay Control

B10

--

--

Not Used

B11

GRY

705

5 Volt Reference

B12

LT GRN

1037

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-A5

--

--

Not Used

A6

YEL

1836

Security System Sensor Signal

A7

--

--

Not Used

A8

DK GRN

306

DRL On/Off Signal

A9-A10

--

--

Not Used

A11

PPL

328

Interior Lamp Defeat Switch Signal

A12

--

--

Not Used

B1

YEL

710

Class 2 Serial Data

B2

BRN/WHT

301

Park Lamp Switch On Signal

B3-B5

--

--

Not Used

B6

BLK/WHT

351

Ground

B7

--

--

Not Used

B8

ORN/BLK

2090

Dimming Input

B9

LT GRN

11

Headlamp Dimmer Switch Signal

B10

--

--

Not Used

B11

LT BLU

1788

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

PNK

1020

Ignition 0 Voltage

A4

PNK

39

Ignition 1 Voltage

A5

LT GRN

1177

Door Open Switch Signal

A6

--

--

Not Used

A7

LT BLU

1134

Park Brake Switch Signal

A8-A9

--

--

Not Used

A10

YEL/BLK

1181

Rear Door Open Switch Signal (Passenger/Cargo)

A11

--

--

Not Used

A12

WHT

103

Headlamp Switch Headlamps On Signal

B1-B2

--

--

Not Used

B3

YEL

343

Accessory Voltage

B4

TAN

126

Left Front Door Open Switch Signal

B5

LT BLU

195

Door Lock Control (AU3) w/o PRP

B6

GRY/BLK

2226

Dimming Return

B7-B8

--

--

Not Used

B9

DK BLU/WHT

1495

Courtesy Lamps On Signal

B10

WHT

194

Door Unlock Control (AU3) w/o PRP

B11-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

RED/WHT

2140

Battery Positive Voltage

E

DK BLU/WHT

149

Courtesy Lamp Supply Voltage - w/o YF7

GRY/BLK

690

Courtesy Lamp High Control - w/YF7

F

LT GRN

24

Backup Lamp Supply Voltage