GM Service Manual Online
For 1990-2009 cars only
Connector 1: Powertrain Control Module (PCM) C1
Connector 2: Powertrain Control Module (PCM) C2
Connector 3: Powertrain Control Module (PCM) C3

Powertrain Control Module (PCM) C1


Object Number: 1228485  Size: CH

Connector Part Information

  • OEM: 15452125
  • Service: 88953346
  • Description: 56-Way F Micro 64 Series Sealed (BU)

Terminal Part Information

  • Pins: 6-8, 11-13, 15-24, 26-32, 37-38, 40-41, 43, 46-51, 54-56
  • Terminal/Tray: 15359541/4
  • Core/Insulation Crimp: M/M
  • Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)

Powertrain Control Module (PCM) C1

Pin

Wire Color

Circuit No.

Function

1-5

--

--

Not Used

6

D-GN/WH

459

A/C Compressor Clutch Relay Control

7

BN

1271

Low Reference

8

PU

1272

Low Reference

9-10

--

--

Not Used

11

GY/BK

87

Cruise Control Resume/Accel Switch Signal

12

PU

1589

Fuel Level Sensor Signal [- Primary]

13

PK

839

Ignition 1 Voltage

14

--

--

Not Used

15

YE

710

Class 2 Serial Data

16

D-GN

1049

Class 2 Serial Data

17

GY

2700

5-Volt Reference

18

PK

1020

Ignition 0 Voltage

19

PK

439

Ignition 1 Voltage

20

OG

440

Battery Positive Voltage

21

D-GN/WH

817

Vehicle Speed Signal

22

WH

1310

EVAP Canister Vent Solenoid Control

23

D-BU

2364

Cooling Fan Speed Signal

24

D-GN

890

Fuel Tank Pressure Sensor Signal

25

--

--

Not Used

26

RD/BK

380

A/C Refrigerant Pressure Sensor Signal

27

D-BU

1161

APP Sensor 1 Signal

28

D-BU

84

Cruise Control Set/Coast Switch Signal

29

OG/BK

510

Low Reference

30

WH/BK

1164

5-Volt Reference

31

WH

121

Engine Speed Signal

32

L-BU

1320

CHMSL Supply Voltage/Stop Lamp Supply Voltage

33-36

--

--

Not Used

37

D-GN/WH

465

Fuel Pump Relay Control [- Primary]

38

YE

5991

Powertrain Relay Coil Control

39

--

--

Not Used

40

BN/WH

419

MIL Control

41

L-BU

1162

APP Sensor 2 Signal

42

--

--

Not Used

43

TN

1274

5-Volt Reference

44-45

--

--

Not Used

46

PU

420

TCC Brake Switch/Cruise Control Release Signal

47

GY

2709

5-Volt Reference

48

YE/BK

625

Starter Enable Relay Control

49

GY

397

Cruise Control On Switch Signal

50

YE

5

Crank Voltage

51

WH/BK

2366

Cooling Fan Clutch Control

52-53

--

--

Not Used

54

D-GN

1433

PNP/Clutch Start Switch Signal

55

BK

2759

Low Reference

56

BK

2751

Low Reference

Powertrain Control Module (PCM) C2


Object Number: 1671569  Size: CH

Connector Part Information

  • OEM: 15452126 (Early Production Only) / 15491925 (Late Production Only)
  • Service: 88953274
  • Description: 73-Way F GT 280 Micro 64 Series Sealed (BK) (Early Production Only) / 50-Way F GT 280 Micro 64 Series Sealed (BK) (Late Production Only)

Terminal Part Information

  • Pins: 1-2, 4-10, 14, 17-22, 26, 28, 30, 32-33, 35-37, 39-42, 44-45, 47-48, 51-60, 64-66, 68-69, 71-72
  • Terminal/Tray: 15359541/4
  • Core/Insulation Crimp: M/M
  • Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 15304720/19
  • Core/Insulation Crimp: 4/5
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Powertrain Control Module (PCM) C2

Pin

Wire Color

Circuit No.

Function

1

RD

225

Generator Turn On Signal

2

D-GN

485

TP Sensor 1 Signal

3

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

4

GY

597

5-Volt Reference

5

BN/WH

6789

Air Injection Reaction Control Valve #1 Volt Reference

6

GY

2701

5-Volt Reference

7

PU

486

TP Sensor 2 Signal

8

GY

2704

5-Volt Reference

9

L-BU/BK

1688

5-Volt Reference

10

D-GN/WH

2124

IC 4 Control

11-13

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

14

PK/BK

632

Low Reference

15-16

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

17

YE

573

CKP Sensor Signal

18

PU

574

Low Reference

19

BK

2199

Low Reference

20

OG/BK

469

Low Reference

21

GY

2365

Low Reference

22

RD

631

12-Volt Reference

23-25

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

26

BN/WH

633

CMP Sensor Signal

27

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

28

PU

421

Air Injection Reaction Solenoid Relay Coil Control

29

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

30

D-BU/WH

6785

Air Injection Reaction Control Valve #1 Low Reference

31

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

32

TN

1664

HO2S Low Signal

33

BK

1744

Fuel Injector 1 Control

34

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

35

YE

410

ECT Sensor Signal

36

BK/WH

1704

Low Reference

37

L-GN

432

MAP Sensor Signal

38

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

39

BK

2752

Low Reference

40

PU

2121

IC 1 Control

41

YE

492

MAF Sensor Signal

42

L-BU

2123

IC 3 Control

43

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

44

RD/WH

2122

IC 2 Control

45

GY

23

Generator Field Duty Cycle Signal

46

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

47

BN

2198

Camshaft Position Actuator Solenoid High Control

48

PU/WH

1665

HO2S High Signal

49-50

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

51

TN

472

IAT Sensor Signal

52

BK

2761

Low Reference

53

BK/WH

845

Fuel Injector 5 Control

54

YE/BK

846

Fuel Injector 6 Control

55

PK/BK

1746

Fuel Injector 3 Control

56

L-GN/BK

1745

Fuel Injector 2 Control

57

L-BU/BK

844

Fuel Injector 4 Control

58

D-GN

676

HO2S Heater Low Control

59

D-GN

2125

IC 5 Control

60

L-BU/WH

2126

IC 6 Control

61-63

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

64

BK

2760

Low Reference

65

BN

582

TAC Motor Control - 2

66

YE

581

TAC Motor Control - 1

67

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

68

D-BU

496

KS 1 Signal

69

GY

1716

KS 1 Signal

70

--

--

Not Used (Early Production)

--

--

Not Available (Late Production)

71

GY

2303

KS 2 Signal

72

L-BU

1876

KS 2 Signal

73

BK

450

Ground

Powertrain Control Module (PCM) C3


Object Number: 1283894  Size: CH

Connector Part Information

  • OEM: 15437820 (Early Production Only) / 15491927 (Late Production Only)
  • Service: 88953347
  • Description: 56-Way F Micro 64 Series Sealed (GY) (Early Production Only) / 27-Way F Micro 64 Series Sealed (GY) (Early Production Only)

Terminal Part Information

  • Pins: 1-2, 4, 6-7, 15, 17, 19-21, 25, 30-31, 33-7, 39, 43-48, 50, 52
  • Terminal/Tray: 15359541/4
  • Core/Insulation Crimp: M/M
  • Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)

Powertrain Control Module (PCM) C3

Pin

Wire Color

Circuit No.

Function

1

PK

1224

Transmission Fluid Pressure Switch Signal A

2

GY

773

Transmission Range Switch Signal C

3

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

4

TN/WH

1669

HO2S Low Signal

5

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

6

RD/BK

1228

PC Solenoid Valve High Control (Sol. A)

7

YE/BK

1227

TFT Sensor Signal

8-14

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

15

TN/BK

231

Oil Pressure Switch Signal

16

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

17

BK

2762

Low Reference

18

--

--

Not Used

19

PU/WH

1668

HO2S High Signal

20

BK/WH

771

Transmission Range Switch Signal A

21

WH

687

3-2 Shift Solenoid Valve Control

22-24

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

25

TN/BK

422

TCC Solenoid Valve Control

26-29

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

30

RD

1226

Transmission Fluid Pressure Switch Signal C

31

YE

6787

Air Injection Reaction Control Valve #1 Control

32

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

33

L-GN

1222

1-2 Shift Solenoid Valve Control

34

TN/BK

464

Delivered Torque Signal

35

YE/BK

1223

2-3 Shift Solenoid Valve Control

36

PU

114

Low Oil Pressure Switch Signal

37

D-GN/WH

428

EVAP Canister Purge Solenoid Control

38

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

39

BN

418

TCC PWM Solenoid Valve Control

40-42

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

43

D-BU

1225

Transmission Fluid Pressure Switch Signal B

44

L-GN/BK

822

VSS Low Signal

45

PU/WH

821

VSS High Signal

46

BK/WH

1423

HO2S Heater Low Control

47

OG/BK

463

Requested Torque Signal

48

L-BU/WH

1229

PC Solenoid Valve Low Control

49

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

50

YE

772

Transmission Range Switch Signal B

51

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)

52

WH

776

Transmission Range Switch Signal P

53-56

--

--

Not Used (Early Production Only)

--

--

Not Available (Late Production Only)