GM Service Manual Online
For 1990-2009 cars only
Table 1: VCM Connector C1
Table 2: VCM Connector C2
Table 3: VCM Connector C3
Table 4: VCM Connector C4

VCM Connector C1


Object Number: 358772  Size: CF

Connector Part Information

    • 12129025
    • 32 pin VCM Connector C1 (BLU)

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

BRN/WHT

633

1X CMP Sensor Signal

4-6

--

--

Not Used

7

TAN

1667

HO2S Bank 2 Sensor 1 Low

8

PNK/BLK

632

CMP Sensor Ground

9

--

--

Not Used

10

TAN/BLK

422

TCC Solenoid Control

11-12

--

--

Not Used

13

WHT

687

3-2 Valve Assembly Control

14

--

--

Not Used

15

YEL/BLK

1827

Vehicle Speed Output

16-18

--

--

Not Used

19

PPL/WHT

1665

HO2S Bank 1 Sensor 1 High

20

--

--

Not Used

21

PPL

1666

HO2S Bank 2 Sensor 1 High

22

PPL/WHT

1668

HO2S Bank 1 Sensor 3 High

23-24

--

--

Not Used

25

TAN/WHT

1653

HO2S Bank 1 Sensor 1 Low

26

TAN/WHT

1669

HO2S Bank 1 Sensor 3 Low

27

--

--

Not Used

28

PPL

574

CKP Sensor Ground

29

LT GRN/BLK

822

VSS Low

30

PPL/WHT

821

VSS High

31

YEL

573

3X CKP Sensor Signal

32

--

--

Not Used

VCM Connector C2


Object Number: 358777  Size: CF

Connector Part Information

    • 12129025
    • 32 Pin VCM Connector C2 (RED)

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

WHT

1310

EVAP Canister Vent Valve Control

3

--

--

Not Used

4

YEL/BLK

1223

2-3 SS Valve Control

5

--

--

Not Used

6

LT GRN

1222

1-2 SS Valve Control

7

BRN

418

TCC PWM SOL Valve Control

8

BLK

1744

Fuel Injector #1 Driver

9

YEL/BLK

846

Fuel Injector #6 Driver

10

BRN

1456

EGR Pintle Position Signal

11-12

--

--

Not Used

13

LT GRN/WHT

1749

IAC Coil B High

14

LT BLU/WHT

1747

IAC Coil A High

15

LT GRN/BLK

1745

Fuel Injector #2 Driver

16

PNK/BLK

1746

Fuel Injector #3 Driver

17-18

--

--

Not Used

19

DK BLU

496

Knock Sensor Signal

20

WHT

121

Tachometer Output

21

LT GRN

432

MAP Sensor Signal

22

TAN

472

IAT Sensor Signal

23

YEL

410

ECT Sensor Signal

24

DK BLU

417

TP Sensor Signal

25

DK GRN

890

Fuel Tank Pressure Sensor Signal

26

--

--

Not Used

27

YEL/BLK

1227

TFT Sensor Signal

28

YEL

492

MAF Sensor Signal

29

LT GRN/BLK

444

IAC Coil B Low

30

LT BLU/BLK

1748

IAC Coil A Low

31

BLK/WHT

845

Fuel Injector #5 Driver

32

LT BLU/BLK

844

Fuel Injector #4 Driver

VCM Connector C3


Object Number: 358779  Size: CF

Connector Part Information

    • 12129025
    • 32 pin VCM Connector C3 (Clear)

Pin

Wire Color

Circuit No.

Function

1

DK GRN/WHT

459

A/C Compressor Clutch Relay Control

2

DK GRN/WHT

428

EVAP Canister Purge Valve Control

3

--

--

Not Used

4

BLK

452

Sensor Ground

5

RED

225

L Terminal Generator Control/Monitoring

6

RED/BLK

1228

PC SOL Valve High

7-8

--

--

Not Used

9

WHT

423

IC Control

10

--

--

Not Used

11

RED

1226

Transmission Range C Input

12

GRY

416

5 Volt Reference

13

PPL

1589

Fuel Level Sensor Signal

14-15

--

--

Not Used

16

LT BLU WHT

1229

PC SOL Valve Low

17

BLK/WHT

351

VCM Ground

18

BLK/WHT

351

VCM Ground

19

BLK

470

Sensor Ground

20

--

--

Not Used

21

ORN

440

Battery Positive Voltage (B+)

22

DK BLU

1225

Transmission Range B Input

23

PNK

1224

Transmission Range A Input

24

--

--

Not Used

25

GRN/WHT

762

A/C Request Signal

26

WHT

776

PRNDL P

27

GRY

474

5 Volt Reference

28

GRY

773

PRNDL C

29

--

--

Not Used

30

DK GRN

603

A/C Cycling Switch Signal

31

BLK/WHT

771

PRNDL A

32

YEL

772

PRNDL B

VCM Connector C4


Object Number: 358782  Size: CF

Connector Part Information

    • 24 Pin VCM Connector C4 (Black)
    • 12129225

Pin

Wire Color

Circuit No.

Function

1

DK GRN/WHT

465

Fuel Pump Relay Control

2

--

--

Not Used

3

DK GRN/WHT

817

Vehicle Speed Output

4

DK GRN

389

Vehicle Speed Output

5

BRN/WHT

419

MIL Control

6-9

--

--

Not Used

10

PPL

420

Brake Switch Input

11

DK GRN

1049

Serial Data (Class 2)

12

--

--

Not Used

13

BRN

241

Ignition Positive Voltage

14

YEL

710

Serial Data (Class 2)

15

--

--

Not Used

16

RED

1676

EGR Valve Control

17

PNK

1020

Ignition Positive Voltage

18

PNK

439

Ignition Positive Voltage

19

BLK/WHT

1695

4WD Wheel Lock Input

20

WHT

257

EGR Valve Ground

21

--

--

Not Used

22

GRY

48

CPP Switch Signal

23

GRY/BLK

1694

4WD Indicator Signal Input

24

LT BLU/BLK

396

Cruise Engaged Input