GM Service Manual Online
For 1990-2009 cars only
Connector 1: Body Control Module (BCM) C1
Connector 2: Body Control Module (BCM) C2
Connector 3: Body Control Module (BCM) C3
Connector 4: Body Control Module (BCM) C4
Connector 5: Data Link Connector (DLC)

Body Control Module (BCM) C1


Object Number: 73152  Size: CH

Connector Part Information

  • OEM: 12084945
  • Service: See Catalog
  • Description: 16-Way F Micro-Pack 100 Series (GY)

Body Control Module (BCM) C1

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

L-GN

1391

Driver Door Unlock Relay Control (AU0)

A3

L-BU

195

Door Lock Relay Control (AU0)

A4

WH

194

Door Unlock Relay Control (AU0)

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

GY

731

EVAP Temperature Sensor Signal

B5

--

--

Not Used

B6

L-GN/BK

1137

DRL Ambient Light Sensor Signal (T82)

B7

YE/BK

1138

DRL Ambient Light Sensor Low Reference (T82)

B8

L-GN

66

A/C Request Signal

Body Control Module (BCM) C2


Object Number: 73156  Size: CH

Connector Part Information

  • OEM: 12110088
  • Service: See Catalog
  • Description: 24-Way F Micro-Pack 100 Series (GY)

Body Control Module (BCM) C2

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

L-BU

1134

Park Brake Switch Signal

A3

PK

1200

Headlamp High Beam Signal

A4

--

--

Not Used

A5

PU

333

Brake Fluid Level Switch Signal

A6

BN

96

Windshield Wiper Switch Pulse Delay Signal

A7

--

--

Not Used

A8

PK

94

Windshield Washer Switch Signal

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 Doors Ajar Switch Signal

B1

YE

749

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

Liftgate Ajar Switch Signal

B5

D-GN

392

Rear Window Washer Pump Control

B6

L-BU

74

Park Lamp Switch Signal (T82)

B7

OG

192

Fog Lamp Switch Signal (T96)

B8

--

--

Not Used

B9

YE

743

Accessory Voltage

B10

BN

9

Park Lamp Supply Voltage

B11

L-GN

1478

Coolant Level Switch Signal

B12

PU

719

Low Reference

Body Control Module (BCM) C3


Object Number: 130689  Size: CH

Connector Part Information

  • OEM: 12110244
  • Service: See Catalog
  • Description: 24-Way F Micro-Pack 100 Series (PK)

Body Control Module (BCM) C3

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 (T82)

A4

YE

317

Fog Lamp Relay Control (T96)

A5

OG/BK

1445

Windshield Wiper Relay Control

A6

RD

2445

Rear Wiper Relay Control

A7

WH

1080

Park Lamp Relay Control (T82)

A8

L-GN/BK

592

DRL Relay Control

A9

BN/WH

230

I/P Lamps Dimming Control

A10

PU

1807

Class 2 Serial Data

A11

--

--

Not Used

A12

TN

2501

CAN Low

B1

TN/WH

816

A/T Shift Lock Switch Signal (A/T)

B2

BK

28

Horn Relay Control

B3

OG/BK

1057

Low Reference

B4

GY

112

Windshield Wiper Switch Signal 1

B5

TN

470

Low Reference

B6

WH

193

Rear Defog Relay Control

B7

YE

1836

Security System Sensor Signal

B8

D-GN

113

Windshield Wiper Switch Signal 2

B9

PU

1807

Class 2 Serial Data

B10

PU

1807

Class 2 Serial Data

B11

--

--

Not Used

B12

TN/WH

2500

CAN High

Body Control Module (BCM) C4


Object Number: 73158  Size: CH

Connector Part Information

  • OEM: 12110626
  • Service: See Catalog
  • Description: 8-Way F Metri-Pack 280 Series (GY)

Body Control Module (BCM) C4

Pin

Wire Color

Circuit No.

Function

A

OG

1732

Courtesy Lamps Supply Voltage

B-C

--

--

Not Used

D

OG

2540

Battery Positive Voltage

E

GY

8

I/P Lamps Dimmer Switch Signal

F

BK/WH

151

Ground

G

--

--

Not Used

H

OG

1640

Battery Positive Voltage

Data Link Connector (DLC)


Object Number: 1243575  Size: CH

Connector Part Information

  • OEM: 348822-2
  • Service: See Catalog
  • Description: 16-Way F Diangnostic Connector (BK)

Data Link Connector (DLC)

Pin

Wire Color

Circuit No.

Function

1

D-GN

5060

Low Speed GM LAN Serial Data (U32/U2K)

2

PU

1807

Class 2 Serial Data

3

--

--

Not Used

4

BK

550

Ground

5

BK/WH

151

Ground

6

--

--

Not Used

7

BN/WH

2960

Keyword Serial Data

8-11

--

--

Not Used

12

WH/BK

5043

Keyword Serial Data

13-15

--

--

Not Used

16

OG

340

Battery Positive Voltage