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

Vehicle Control Module (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 Signal

4-6

--

--

Not Used

7

TAN

1667

HO2S Low Signal Bank 2 Sensor 1

8

PNK/BLK

632

CMP Low

9

PPL

30

Fuel Gage

10-13

--

--

Not Used

14

BRN

436

AIR Relay Control (California Only)

15

YEL/BLK

1827

VSS

16-17

--

--

Not Used

18

PPL/WHT

1589

Dual Tank Fuel Module

19

PPL/WHT

1665

HO2S High Signal Bank 1 Sensor 1

20

PPL

1670

HO2S High Signal Bank 1 Sensor 2

21

PPL

1666

HO2S High Signal Bank 2 Sensor 1

22

PPL/WHT

1668

HO2S High Signal Bank 2 Sensor 2

23

TAN

413

HO2S Low Reference

24

TAN

1671

HO2S Low Signal Bank 1 Sensor 2

25

TAN/WHT

1653

HO2S Low Signal Bank 1 Sensor 1

26

TAN/WHT

1669

HO2S Low Signal Bank 2 Sensor 2

27

--

--

Not Used

28

PPL

574

CKP Low

29

LT GRN/BLK

822

VSS Low

30

PPL/WHT

821

VSS Signal

31

YEL

573

4X CKP Signal

32

--

--

Not Used

Vehicle Control Module (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

Canister Vent Solenoid

3

--

--

Not Used

4

YEL/BLK

1223

2-3 Shift Solenoid

5

--

--

Not Used

6

LT GRN

1222

1-2 Shift Solenoid

7

BRN

418

PWM TCC Solenoid

8

BLK

1744

Injector # 1 Control

9

DK BLU/WHT

878

Injector # 8 Control

10

BRN

1456

EGR Pintle Position

11

LT GRN/BLK

1745

Injector # 2 Control

12

RED/BLK

877

Injector # 7 Control

13

LT GRN/WHT

1749

IAC B High

14

LT BLU/WHT

1747

IAC A High

15

BLK/WHT

845

Injector # 5 Control

16

YEL/BLK

846

Injector # 6 Control

17-18

--

--

Not Used

19

DK BLU

496

KS Signal

20

--

--

Not Used

21

LT GRN

432

MAP Signal

22

TAN

472

IAT Signal

23

YEL

410

ECT Signal

24

DK BLU

417

TP Signal

25

DK GRN

890

Fuel Tank Vacuum Sensor

26

--

--

Not Used

27

YEL/BLK

1227

TFT Signal (Automatic Transmission only)

28

YEL

492

MAF Signal

29

LT GRN/BLK

444

IAC High

30

LT BLU/BLK

1748

IAC Low

31

LT BLU/BLK

844

Injector #4 control

32

PNK/BLK

1746

Injector #3 control

Vehicle Control Module (VCM) Connector C3


Object Number: 358779  Size: CF

Connector Part Information

    • 12129025
    • 32 Pin VCM Connector C3 (CLR)

Pin

Wire Color

Circuit No.

Function

1

DK GRN/WHT

459

A/C Relay

2

DK GRN/WHT

--

428

Purge Canister Solenoid

3

--

--

Not Used

4

BLK

452

ECT/TP Sensor Ground

5

--

--

Not Used

6

RED/BLK

1228

PCS High

7

DK BLU/WHT

1231

Input Speed Sensor Low

8

RED/BLK

1230

Input Speed Sensor High

9

WHT

423

IC Control

10

--

--

Not Used

11

RED

1226

Range Signal C

12

GRY

416

TP Sensor 5V Reference

13

PPL/WHT

1589

Fuel Level signal

14

DK BLU

604

A/C Recirculation

15

--

--

Not Used

16

LT BLU/WHT

1229

PCS Low (Automatic Transmission Only)

17

BLK/WHT

451

System Ground

18

BLK/WHT

451

System Ground

19

BLK

470

IAT/MAP/EGR Sensor Ground

20

--

--

Not Used

21

ORN

440

Battery feed

22

DK BLU

1225

Range Signal B

23

PNK

1224

Range Signal A

24

--

--

Not Used

25

DK GRN/WHT

762

A/C Request Signal

26

--

--

Not Used

27

GRY

474

EGR/MAP 5V Reference

28-29

--

--

Not Used

30

DK GRN

603

A/C Compressor Cycling Switch

31-32

--

--

Not Used

Vehicle Control Module (VCM) Connector C4


Object Number: 358782  Size: CF

Connector Part Information

    • 12129225
    • 32 Pin VCM Connector C4 (BLK)

Pin

Wire Color

Circuit No.

Function

1

DK GRN/WHT

465

Fuel Pump Relay Control

2

--

--

Not Used

3

DK GRN/WHT

817

VSS Output Signal (TCCM, Radio, Cruise)

4

DK GRN

389

VSS Output Signal (speedo)

5

BRN/WHT

419

MIL Control

6

--

--

Not Used

7

DK GRN

1614

Recirculation Door Motor Signal

8

--

--

Not Used

9

DK BLU

473

Auxiliary Cooling Fan Relay Control

10

PPL

420

Brake Signal

11

PPL

1807

Class 2 Serial Data

12

BLK

900

Dual Fuel Module Return

13

BRN

441

Ignition Feed

14-15

--

--

Not Used

16

RED

1676

EGR Valve Feed

17

--

--

Not Used

18

PNK

439

Ignition Feed

19

BLK/WHT

1695

4WD Front Axle Engaged Signal

20

WHT

257

EGR Valve Control

21

--

--

Not Used

22

BRN/WHT

379

Clutch Pedal Position Switch Signal (Manual Transmission)

23

GRY/BLK

1694

4WD Low Range Signal (automatic transmission)

24

LT BLU/BLK

396

Cruise Engaged Signal