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

Powertrain Control Module (PCM) Connector C1


Object Number: 31454  Size: CF

Connector Part Information

    â€¢ 12160779
    â€¢ PCM 32 Way BRN (C1) Connector

Pin

Wire Color

Circuit No.

Function

C1

--

--

Not Used

C2

DK GRN/WHT

762

A/C Request

C3

YEL

492

Mass Air Flow Signal

C4

TAN

472

IAT Signal

C5

LT BLU

1162

APP (2) Signal

C6

YEL

505

Glow Plug Relay Control

C7

RED/BLK

1228

Pressure Control Solenoid Valve (Hi)

C8

YEL

1578

Fuel Temperature

C9

YEL/BLK

1227

TFT Sensor

C10

--

--

Not Used

C11

YEL

410

ECT Signal

C12

GRY/BLK

433

EGR Control Pressure/BARO Signal

C13

RED

313

Closure Signal

C14

LT GRN

432

Boost Sensor Signal

C15

LT BLU/WHT

1229

Pressure Control Solenoid Valve (Lo)

C16

--

--

Not Used

D1

BLU/WHT

1231

Transmission Input Speed Signal

D2

GRY/BLK

1694

4WD Low Indicator Signal

D3

YEL/BLK

1275

APP (3) 5 Volt Ref.

D4

DK GRN

1163

APP (3) Signal

D5

GRY

120

Fuel Lift Pump Signal

D6

GRY

1273

APP (3) Ground

D7

BRN

104

Glow Plug Signal

D8

DK GRN/WHT

465

Fuel Lift Pump Control

D9

PNK/BLK

632

Pump CAM, High Res. and Fuel Temperature Ground

D10

GRY/BLK

87

Cruise Resume/Accel Request

D11

RED/BLK

1230

Transmission Input Speed Signal (Lo)

D12

WHT/BLK

1164

APP (1) 5 Volt Ref.

D13

GRY

416

Boost, CKP and EGR Cont/BARO 5 Volt Ref.

D14

GRY

474

Pump CAM and High Res. 5 Volt Ref.

D15-D16

--

--

Not Used

Powertrain Control Module (PCM) Connector C2


Object Number: 31460  Size: CF

Connector Part Information

    â€¢ 12160778
    â€¢ PCM 24 Way BRN (C2) Connector

Pin

Wire Color

Circuit No.

Function

A1

BLK

491

Closure Ground

A2

ORN

1799

High Res. Signal

A3

BRN

437

Transmission Output Speed Signal (OSS)

A4

BRN/WHT

633

Pump CAM Sensor Signal

A5

YEL

573

CKP Sensor Signal

A6

DK GRN

389

VSS Signal

A7

RED/BLK

1031

Injection Timing Stepper Motor (HI)

A8

TAN/BLK

1030

Injection Timing Stepper Motor (LO)

A9

ORN/BLK

1032

Injection Timing Stepper Motor (LO)

A10

YEL/BLK

1033

Injection Timing Stepper Motor (HI)

A11

GRY

397

Cruise ON/OFF Signal

A12

PPL

1272

APP (2) Ground

B1

BRN

1271

APP (1) Ground

B2

DK BLU

1161

APP (1) Signal

B3

BLK/WHT

1695

Front Axle Switch Signal

B4

RED

1226

TR Switch C

B5

DK BLU

1225

TR Switch B

B6

PNK

1224

TR Switch A

B7

--

--

PTO (1360 RPM)

B8

--

--

PTO (1070 RPM)

B9

  • PPL (A/T)
  • BRN/WHT (M/T)
  • 420 (A/T)
  • 379 (M/T)
  • Cruise Control Brake Switch (A/T)
  • Brake/CPP Switch (M/T)

B10

WHT

17

Brake Switch

B11

DK BLU

84

Cruise Set/Coast Signal

B12

BLK

452

Sensor Ground (Boost, EGR, ECT, IAT, Fuel Temp., TFT and CKP Sensor)

Powertrain Control Module (PCM) Connector C3


Object Number: 31454  Size: CF

Connector Part Information

    â€¢ 12110207
    â€¢ PCM 32 Way BLU (C3) Connector

Pin

Wire Color

Circuit No.

Function

C1

--

--

Not Used

C2

TAN

1274

APP (2) 5 Volt Ref.

C3

LT GRN

260

Fuel Inject Control

C4

LT GRN

1222

Shift Solenoid (1-2)

C5

BRN

418

TCC PWM

C6

YEL/BLK

1223

Shift Solenoid (2-3)

C7

DK BLU

507

Wait To Start Lamp Control

C8

PPL

1807

Class 2 Communication

C9-C10

--

--

Not Used

C11

PNK

439

Ignition

C12

PNK

439

Ignition

C13

ORN

440

Battery

C14

BRN/WHT

419

MIL Control

C15

DK BLU/WHT

259

ESO Control

C16

GRY

435

EGR Solenoid Control

D1-D2

--

--

Not Used

D3

LT GRN/BLK

260

Fuel Inject Control

D4

--

--

Not Used

D5

DK GRN/WHT

459

A/C Enable

D6

BLK/WHT

451

Ground

D7

TAN/WHT

551

Ground

D8-D10

--

--

Not Used

D11

WHT/BLK

176

Service Throttle Soon Lamp Control

D12

WHT

257

EGR Vent Control

D13

ORN

440

Battery

D14

YEL

258

Wastegate Solenoid Control

D15

DK BLU/WHT

259

ESO Solenoid Control

D16

--

--

Not Used