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 Cam Signal

4-6

--

--

Not Used

7

TAN

632

HO2S Low Bank 2 Sensor 1

8

PNK/BLK

632

CMP Sensor Ground

9

PPL

30

Fuel Level Output

10

TAN/BLK

422

TCC Solenoid Control

Empty with M/T

11-12

--

--

Not Used

13

WHT

687

3-2 Control Solenoid

Empty with M/T

14

--

--

Not Used

15

YEL/BLK

1827

VSS Output Signal

16-18

--

--

Not Used

19

PPL/WHT

1665

HO2S High Bank 1 Sensor 1

20

PPL

1670

HO2S High Bank 1 Sensor 2 (Unused)

21

PPL

1666

HO2S High Bank 2 Sensor 1

22

PPL/WHT

1668

HO2S High Bank 1 Sensor 3

23

--

--

Not Used

24

TAN

1671

HO2S Low Bank 1 Sensor 2 (Unused)

25

TAN/WHT

1653

HO2S Low Bank 1 Sensor 1

26

TAN/WHT

1669

HO2S Low Bank 1 Sensor 3

27

--

--

Not Used

28

PPL

547

CKP Sensor Ground

29

LT GRN/BLK

822

VSS Low

30

PPL/WHT

821

VSS Signal

31

YEL

573

3X 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

Vent Control

3

--

--

Not Used

4

YEL/BLK

1223

2-3 Shift Solenoid Valve Control

Empty with M/T

5

--

--

Not Used

6

LT GRN

1222

2-3 Shift Solenoid Control

Empty with M/T

7

BRN

418

PWM TCC Solenoid Control

Empty with M/T

8

BLK

1744

Injector #1 Control

9

YEL/BLK

846

Injector #6 Control

10

BRN

1456

EGR Pintle Position

11-12

--

--

Not Used

13

LT GRN/WHT

1749

IAC B High

14

LT BLU/WHT

1747

IAC A High

15

LT GRN/BLK

1745

Injector #2 Control

16

PNK/BLK

1746

Injector #3 Control

17-18

--

--

Not Used

19

DK BLU

496

KS Input

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 Pressure Signal

26

--

--

Not Used

27

YEL/BLK

1227

TFT Signal

Empty with M/T

28

YEL

292

MAF Signal

29

LT GRN/BLK

444

IAC B Low

30

LT BLU/BLK

1748

IAC A Low

31

BLK/WHT

845

Injector #5 Control

32

LT BLU/BLK

844

Injector #4 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 Compressor Enable Relay Control

Empty without A/C

2

DK GRN/WHT

428

EVAP Canister Purge

3

--

--

Not Used

4

BLK

452

ECT/TP Sensor Ground

5

--

--

Not Used

6

RED/BLK

1228

PCS High

Empty with M/T

7-8

--

--

Not Used

9

WHT

423

IC Control

10

--

--

Not Used

11

RED

1226

Range Signal C

Empty with M/T

12

GRY

416

TP Sensor 5 V Reference

13

PPL/WHT

1589

Fuel Level Signal

14

DK BLU

604

A/C Recirculation Switch

Empty without A/C

15

--

--

Not Used

16

LT BLU WHT

1229

PCS Low

Empty with M/T

17

BLK/WHT

451

VCM Ground

18

BLK/WHT

451

VCM Ground

19

BLK

470

IAT/MAP/EGR/Fuel Tank Pressure Ground

20

--

--

Not Used

21

ORN

440

Battery Feed

22

DL BLU

1225

Range Signal B

Empty with M/T

23

PNK

1224

Range Signal A

Empty with M/T

24

--

--

Not Used

25

DK GRN/WHT

762

A/C High Pressure Cutoff Switch

Empty without A/C

27

GRY

474

Fuel Tank Pressure EGR/MAP 5 V Reference

28-29

--

--

Not Used

30

DK GRN

603

A/C Cycling Switch Input

Empty without A/C

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

VSS Output Signal (TCCM, Radio, Cruise)

4

DK GRN

389

VSS Output Signal (Speedo)

5

BRN/WHT

419

MIL Control

6-9

--

--

Not Used

10

PPL

420

Brake Signal

11

PPL

1807

Serial Data

12

--

--

Not Used

13

BRN

441

Ignition Positive Voltage

14

--

--

Not Used

15

TAN/BLK

456

Upshift Indicator Control

Empty with A/T

16

RED

1676

Ignition Positive Voltage

17

--

--

Not Used

18

PNK

439

Ignition Positive Voltage

19

BLK/WHT

1695

4WD Engaged Signal

20

WHT

257

EGR Valve Control

21

--

--

Not Used

22

BRN/WHT

379

CPP Switch Input

Empty with A/T

23

GRY/BLK

1694

Transfer Case High/Low Switch

Empty with 2WD

24

LT BLU/BLK

396

Cruise Engaged Signal

Empty without Cruise Control