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

PCM Connector C1


Object Number: 31454  Size: CF

Connector Part Information

    • 12160779
    • PCM 32 Way BRN (C1) Connector

Pin

Wire Color

Circuit No.

Function

C1

PPL

574

Low Reference

C2

DK GRN/WHT

2523

A/C Request Signal

C3

--

--

Not Used

C4

TAN

472

IAT Sensor Signal

C5

LT BLU

1162

APP Sensor 2 Signal

C6

YEL

505

Glow Plug Relay Control

C7

RED/BLK

1228

PC Solenoid Valve High Control - Solenoid A

C8

YEL

1578

Fuel Temperature Signal

C9

YEL/BLK

1227

TFT Sensor Signal

C10

--

--

Not Used

C11

YEL

410

ECT Sensor Signal

C12

--

--

Not Used

C13

RED

313

Injection Pump Timing Signal

C14

LT GRN

432

MAP Sensor Signal

C15

LT BLU/WHT

1229

PC Solenoid Valve Low Control - Solenoid A

C16

--

--

Not Used

D1

DK BLU/WHT

1231

AT ISS Low Signal

D2

--

--

Not Used

D3

YEL/BLK

1275

5 Volt Reference

D4

DK GRN

1163

APP Sensor 3 Signal

D5

GRY

120

Fuel Pump Supply Voltage

D6

GRY

1273

Low Reference

D7

LT BLU

506

Glow Plug Signal

D8

DK GRN/WHT

465

Fuel Pump Relay Control - Primary

D9

PNK/BLK

632

Low Reference

D10

GRY/BLK

87

Cruise Control Resume/Accel Switch Signal

D11

RED/BLK

1230

AT ISS High Signal

D12

WHT/BLK

1164

5 Volt Reference

D13

GRY

416

5 Volt Reference

D14

GRY

474

5 Volt Reference

D15-D16

--

--

Not Used

PCM Connector C2


Object Number: 31460  Size: CF

Connector Part Information

    • 12160778
    • PCM 24 Way BRN (C2) Connector

Pin

Wire Color

Circuit No.

Function

A1

BLK

491

Low Reference

A2

ORN

1799

High Resolution Signal

A3

BRN

437

Vehicle Speed Signal

A4

BRN/WHT

633

CMP Sensor Signal

A5

YEL

573

CKP Sensor 1 Signal

A6

DK GRN

389

Vehicle Speed Signal

A7

RED/BLK

1031

ITS Coil 1 High

A8

TAN/BLK

1030

ITS Coil 1 Low

A9

ORN/BLK

1032

ITS Coil 2 Low

A10

YEL/BLK

1033

ITS Coil 2 High

A11

GRY

397

Cruise Control On Switch Signal

A12

PPL

1272

Low Reference

B1

BRN

1271

Low Reference

B2

DK BLU

1161

APP Sensor 1 Signal

B3

--

--

Not Used

B4

RED

1226

Transmission Fluid Pressure Switch Signal C

B5

DK BLU

1225

Transmission Fluid Pressure Switch Signal B

B6

PNK

1224

Transmission Fluid Pressure Switch Signal A

B7-B8

--

--

Not Used

B9

PPL

420

TCC Brake Switch Signal

B10

WHT

17

Stop Lamp Switch Signal

B11

DK BLU

84

Cruise Control Set/Coast Switch Signal

B12

BLK

452

Low Reference

PCM Connector C3


Object Number: 31454  Size: CF

Connector Part Information

    • 12110207
    • PCM 32 Way BLU (C3) Connector

Pin

Wire Color

Circuit No.

Function

C1

--

--

Not Used

C2

TAN

1274

5 Volt Reference

C3

--

--

Not Used

C4

LT GRN

1222

1-2 Shift Solenoid Valve Control

C5

BRN

418

TCC PWM Solenoid Valve Control

C6

YEL/BLK

1223

2-3 Shift Solenoid Valve Control

C7

DK BLU

507

Wait to Start Indicator Control

C8

PPL

1807

Class 2 Serial Data - Primary

C9-C10

--

--

Not Used

C11

PNK

339

Ignition 1 Voltage

C12

PNK

339

Ignition 1 Voltage

C13

ORN

440

Battery Positive Voltage

C14

BRN/WHT

419

MIL Control

C15

DK BLU/WHT

259

Engine Shut Off Control

C16

--

--

Not Used

D1-D2

--

--

Not Used

D3

LT GRN

260

Fuel Injection Control

D4

--

--

Not Used

D5

DK GRN/WHT

459

A/C Clutch Relay Control

D6

BLK/WHT

451

Ground

D7

TAN/WHT

551

Ground

D8-D10

--

--

Not Used

D11

WHT/BLK

176

Service Throttle Soon Indicator Control

D12

--

--

Not Used

D13

ORN

440

Battery Positive Voltage

D14

YEL

258

Wastegate Solenoid Control

D15

DK BLU/WHT

259

Engine Shut Off Control

D16

--

--

Not Used