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 Sensor Signal

4-6

--

--

Not Used

7

TAN

1667

HO2S Bank 2 Sensor 1 Low

8

PNK/BLK

632

CMP Sensor Ground

9

PPL

30

Fuel Level Output

10

TAN/BLK

422

TCC Solenoid Control

11-12

--

--

Not Used

13

WHT

687

3-2 SS Valve Assembly Control

14

BRN

436

AIR Pump Relay Control

15

YEL/BLK

1827

Vehicle Speed Output

16-18

--

--

Not Used

19

PPL/WHT

1665

HO2S Bank 1 Sensor 1 High

20

PPL

1670

HO2S Bank 2 Sensor 2 High without C6P (under 8600 GVW)

HO2S Bank 1 Sensor 2 High with C6P (over 8600 GVW)

21

PPL

1666

HO2S Bank 2 Sensor 1 High

22

PPL/WHT

1668

HO2S Bank 2 Sensor 2 High with C6P (over 8600 GVW)

HO2S Bank 1 Sensor 2 High without C6P (under 8600 GVW)

23

--

--

Not Used

24

TAN

1671

HO2S Bank 2 Sensor 2 Low without C6P (under 8600 GVW)

HO2S Bank 1 Sensor 2 Low with C6P (over 8600 GVW)

25

TAN/WHT

1653

HO2S Bank 1 Sensor 1 Low

26

TAN/WHT

1669

HO2S Bank 2 Sensor 2 Low with C6P (over 8600 GVW)

HO2S Bank 1 Sensor 2 Low without C6P (under 8600 GVW)

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

4X CKP Sensor 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

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 Solenoid Valve Control

8

BLK

1744

Fuel Injector #1 Driver

9

DK/BLU/WHT

878

Fuel Injector #8 Driver

10

BRN

1456

EGR Pintle Position Signal

11

LT/GRN/BLK

1745

Fuel Injector #2 Driver

12

RED/BLK

877

Fuel Injector #7 Driver

13

LT/GRN/WHT

1749

IAC Coil B High

14

LT/BLU/WHT

1747

IAC Coil A High

15

BLK/WHT

845

Fuel Injector #5 Driver

16

YEL/BLK

846

Fuel Injector #6 Driver

17-18

--

--

Not Used

19

DK/BLU

496

KS Input

20

--

--

Not Used

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 (Automatic Transmission Only)

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

LT/BLU/BLK

844

Fuel Injector #4 Driver

32

PNK/BLK

1746

Fuel Injector #3 Driver

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 Compressor Clutch Relay Control

2

DK/GRN/WHT

428

EVAP Canister Purge Valve Control

3

--

--

Not Used

4

BLK

452

Sensor Ground

5

--

--

Not Used

6

RED/BLK

1228

PC Solenoid Valve High

7

DK/BLU/WHT

1231

Transmission Input Speed Sensor Low (4L80E)

8

RED/BLK

1230

Transmission Input Speed Sensor High (4L80E)

9

WHT

423

IC Control

10

--

--

Not Used

11

RED

1226

Transmission Range C Input

12

GRY

416

5 Volt Reference

13

PPL/WHT

1589

Fuel Level Sensor Signal

14

DK/BLU

604

A/C Recirculation Signal

15

--

--

Not Used

16

LT/BLU/WHT

1229

PC Solenoid Valve Low (Automatic Transmission Only)

17

BLK/WHT

451

VCM Ground

18

BLK/WHT

451

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

DK/GRN/WHT

762

A/C Request Signal

26

--

--

Not Used

27

GRY

474

5 Volt Reference

28-29

--

--

Not Used

30

DK/GRN

603

A/C Cycling Switch Signal

31-32

--

--

Not Used

Vehicle Control Module (VCM) Connector C4


Object Number: 358782  Size: CF

Connector Part Information

    • 12129225
    • 24 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

Vehicle Speed Output

4

DK/GRN

389

Vehicle Speed Output

5

BRN/WHT

419

MIL Control

6

--

--

Not Used

7

DK/GRN

1614

Recirculation Door Motor Control

8

--

--

Not Used

9

DK/BLU

473

Auxiliary Fan

10

PPL

420

Brake Switch Input

11

PPL

1807

Serial Data (Class 2)

12

BLK

900

Dual Fuel Module Return

13

BRN

441

Ignition Positive Voltage

14

--

--

Not Used

15

TAN/BLK

456

Shift Light (Manual Transmission)

16

RED

1676

EGR Valve Control

17

--

--

Not Used

18

PNK

439

Ignition Positive Voltage

19

BLK/WHT

1695

4WD Wheel Lock Input

20

WHT

257

EGR Valve Ground

21

--

--

Not Used

22

BRN/WHT

379

CPP Switch Signal (Manual Transmission)

23

GRY/BLK

1694

4WD Indicator Signal Input

24

LT/BLU/BLK

396

Cruise Engaged Input