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: 328562  Size: CH

Connector Part Information

    • 12160779
    • 32 Way F Micro-pack 100 Series (BRN)

Pin

Wire Color

Circuit No.

Function

C1

--

--

Not Used

C2

DK GRN/WHT

762

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

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

C16

--

--

Not Used

D1

BLU/WHT

1231

AT ISS Low Signal

D2

GRY/BLK

1694

4WD Low Signal (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

BRN

104

Glow Plug Supply Voltage

D8

DK GRN/WHT

465

Fuel Pump Relay Control

D9

PNK/BLK

632

Low Reference

D10

GRY/BLK

87

Cruise 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: 255037  Size: CH

Connector Part Information

    • 12160778
    • 24 Way F Micro-pack 100 Series (BRN)

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

BLK/WHT

1695

Axle Switch Signal (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 (A/T)
  • BRN/WHT (M/T)
  • 420 (A/T)
  • 379 (M/T)

TCC Brake Switch Signal (A/T)

CPP Switch Signal (M/T)

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: 73157  Size: CH

Connector Part Information

    • 12110207
    • 32 Way F Micro-pack 100 Series (LT BLU)

Pin

Wire Color

Circuit No.

Function

C1

--

--

Not Used

C2

TAN

1274

5 Volt Reference

C3

LT GRN

260

Fuel Injection Control

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

C9-C10

--

--

Not Used

C11

PNK

439

Ignition 1 Voltage

C12

PNK

439

Ignition 1 Voltage

C13

ORN

440

Battery Positive Voltage

C14

BRN/WHT

419

MIL Control

C15-C16

--

--

Not Used

D1-D2

--

--

Not Used

D3

LT GRN/BLK

260

Fuel Injection Control

D4

--

--

Not Used

D5

DK GRN/WHT

459

A/C Compressor 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