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: Data Link Connector (DLC)

Body Control Module (BCM) - C1


Object Number: 73152  Size: CH

Connector Part Information

    • 12084945
    • 16-Way F Micro-Pack 100 Series (GY)

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

L-GN

1391

Driver Door Unlock Relay Control

A3

L-BU

195

Door Lock Relay Control

A4

WH

194

Door Unlock Relay Control

A5-A6

--

--

Not Used

A7

OG/BK

781

Driver Door Lock Switch Unlock Signal

A8

RD/BK

780

Driver Door Lock Switch Lock Signal

B1

--

--

Not Used

B2

D-BU

1201

Headlamp Low Beam Signal

B3

--

--

Not Used

B4

L-BU

74

Park Lamp Switch Signal

B5

--

--

Not Used

B6

L-GN/BK

1137

DRL Ambient Light Sensor Signal

B7

YL/BK

1138

DRL Ambient Light Sensor Low Reference

B8

L-GN

66

A/C Request Signal

Body Control Module (BCM) - C2


Object Number: 73156  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1

L-GN

867

ABS Indicator Failure Control

A2

L-BU

1134

Park Brake Switch Signal

A3

PK

1200

Headlamp High Beam Signal

A4

--

--

Not Used

A5

PU

333

Brake Fluid Level Sensor Signal

A6

BN

96

Windshield Wiper Switch Pulse Delay Signal

A7

L-BU

832

Traction Control Active Signal

A8

PK

94

Windshield Washer Switch Signal (Not Used)

A9

RD

228

Windshield Washer Pump Control

A10

PK

339

Ignition 1 Voltage

A11

L-GN

80

Key In Ignition Switch Signal

A12

BK/WH

746

Passenger Door Ajar Switches Signal

B1

D-GN

264

Security Indicator Control

B2

GY/BK

745

Left Front Door Ajar Switch Signal

B3

L-BU

292

Rear Defog Switch Signal

B4

RD/BK

744

Rear Compartment Lid Ajar Switch Signal

B5

D-GN

392

Rear Window Washer Pump Control

B6

WH

2192

Traction Ready Indicator Control

B7

BK/WH

56

Trunk Release Switch Signal

B8

BK/WH

99

Windshield Washer Fluid Level Signal

B9

YE

743

Accessory Voltage

B10

BN

9

Park Lamp Supply Voltage

B11

L-GN

1478

Coolant Level Switch Signal

B12

--

--

Not Used

Body Control Module (BCM) - C3


Object Number: 130689  Size: CH

Connector Part Information

    • 12110244
    • 24-Way F Micro-Pack 100 Series (PK)

Pin

Wire Color

Circuit No.

Function

A1

WH

156

Dome Lamp Control

A2

RD/WH

812

12-Volt Reference

A3

WH

352

Headlamp Relay Coil Supply Voltage

A4

D-BU

1660

Traction Control Indicator Control

A5

OG/BK

1445

Windshield Wiper Relay Control

A6

OG/BK

1445

Windshield Wiper Relay Control (Not Used)

A7

WH

1080

Park Lamp Relay Control

A8

L-GN/BK

592

DRL Relay Control

A9

GY

1359

LCD Backlighting Lamp Control

A10-A11

--

--

Not Used

A12

TN

2501

CAN Low

B1

TN/WH

816

A/T Shift Lock Solenoid Control

B2

BK

28

Horn Relay Control

B3

OG/BK

1057

Low Reference

B4

GY

112

Windshield Wiper Switch Signal 1

B5

GY/BK

1381

LCD Dimming Signal

B6

WH

193

Rear Defog Relay Control

B7

YE

1836

Security System Sensor Signal

B8

D-GN

113

Windshield Wiper Switch Signal 2

B9

--

--

Not Used

B10

PU

1807

Class 2 Serial Data

B11

TN/WH

2500

CAN High

B12

--

--

Not Used

Body Control Module (BCM) - C4


Object Number: 73158  Size: CH

Connector Part Information

    • 12110626
    • 8-Way F Metri-Pack 280 Series (GY)

Pin

Wire Color

Circuit No.

Function

A

OG

1732

Courtesy Lamp Supply Voltage

B-C

--

--

Not Used

D

OG

2540

Battery Positive Voltage

E

GY

8

Instrument Panel Lamps Dimmer Switch Signal

F

BK

550

Ground

G

GY

382

Trunk Release Enable Relay Switch Supply Voltage

H

OG

1640

Battery Positive Voltage

Data Link Connector (DLC)


Object Number: 808656  Size: CH

Connector Part Information

    • 15317575
    • 16-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

PU

1807

Class 2 Serial Data

3

--

--

Not Used

4

BK

550

Ground

5

BK

451

Ground

6

--

--

Not Used

7

PU

1319

Engine/Radio Serial Data K-Line

8-11

--

--

Not Used

12

L-BU

1276

ABS Serial Data K-Line

13-15

--

--

Not Used

16

OG

2140

Battery Positive Voltage