GM Service Manual Online
For 1990-2009 cars only
Table 1: Back View of the PCM Connector C1
Table 2: Back View Of the PCM Connector C2
Table 3: Back View Of the PCM Connector C3
Table 4: Back View Of the PCM Connector C4

Back View of the PCM Connector C1


Object Number: 477054  Size: CF

Connector Part Information

    • 2.5L VIN 4 Powertrain
    • 35 Pin Gray Connector C1 with Blue Terminal Secondary Lock Insert

Pin

Wire Color

Function

C1-1

WHT/GRN

Fuel Pump Relay Control

C1-2

--

Not Used

C1-3

PNK/BLU

Cruise Control Module Signal

C1-4

BRN

Tachometer

C1-5

YEL/BLU

A/C Condenser Fan Relay Control

C1-6

GRY

TP Signal (for cruise control, if equipped)

C1-7

WHT/BLK

O/D Indicator Lamp Control

C1-8

BLU

Main Relay Control

C1-9

ORN/BLU

Shift Mode Switch Input

C1-10

GRY/BLU

Power/Normal Indicator Lamp Control

C1-11

--

Not Used

C1-12

BLU/WHT

Fuel Tank Level Sensor Input

C1-13

PNK/WHT

HVAC Blower Motor Idle-Up Signal

C1-14

YEL/RED

O/D Switch Signal

C1-15

BLK/ORN

Electrical Load Idle-Up Signal (rear defogger switch)

C1-16 to C1-17

--

Not Used

C1-18

PNK/BLK

EBCM Idle-Up Signal (ABS equipped vehicles only)

C1-19

--

Not Used

C1-20

BRN/RED

Fuel Tank Pressure Sensor Input

C1-21 to C1-24

--

Not Used

C1-25

PPL/GRN

Serial Data Output

C1-26

BLU/ORN

PSP Switch Idle-Up Signal

C1-27

GRY/WHT

A/C Cut-Out Control

C1-28

YEL/BLK

A/C Idle-Up Signal

C1-29

RED/YEL

Tail Lamp Switch Idle-Up Signal

C1-30

--

Not Used

C1-31

GRN/WHT

Brake Switch Signal

C1-32

GRY/YEL

Fuel Tank Pressure Sensor Ground

C1-33

GRY/RED

Fuel Tank Pressure Sensor Reference Voltage

C1-34

PPL/YEL

MIL Control

C1-35

WHT

Battery Positive Voltage

Back View Of the PCM Connector C2


Object Number: 477055  Size: CF

Connector Part Information

    • 2.5L VIN 4 Powertrain
    • 26 Pin Gray Connector C2 with Blue Terminal Secondary Lock Insert

Pin

Wire Color

Function

C2-1

BLU/YEL

VSS Input

C2-2

ORN/BLU

CKP Sensor Signal Low

C2-3

WHT/BLU

CKP Sensor Signal High

C2-4

RED

H02S Bank 1 Sensor 1 Signal

C2-5

BLK/RED

H02S Bank 2 Sensor 1 Heater Control

C2-6

GRY

H02S Bank 1 Sensor 1 Heater Control

C2-7

--

Not Used

C2-8

LT BLU

IAT Sensor Input

C2-9

YEL/GRN

CMP Sensor Signal High

C2-10

YEL/BLU

CMP Sensor Signal Low

C2-11

GRY/RED

Reference Voltage

C2-12

RED/GRN

TP Sensor Input

C2-13

RED/WHT

MAP Sensor Input

C2-14

BLU

H02S Bank 1 Sensor 2 Signal

C2-15

BLU/GRN

H02S Bank 2 Sensor 1 Signal

C2-16

PNK/WHT

H02S Bank 2 Sensor 2 Heater Control

C2-17

WHT/BLK

H02S Bank 1 Sensor 2 Heater Control

C2-18

--

Not Used

C2-19

PPL/RED

EVAP Canister Vent Solenoid Control

C2-20

GRY/YEL

Sensor Ground

C2-21

GRY/YEL

Sensor Ground

C2-22

ORN/BLK

ECT Sesnor Input

C2-23

PPL/WHT

MAF Sensor Input

C2-24

BRN

H02S Bank 2 Sensor 2 Signal

C2-25

BLK/GRN

Ground

C2-26

BLK/BLU

Ground

Back View Of the PCM Connector C3


Object Number: 690490  Size: CF

Connector Part Information

    • 2.5L VIN 4 Powertrain
    • 20 Pin Connector C3 with White Terminal Secondary Lock Insert

Pin

Wire Color

Function

C3-1

LT GRN/RED

Shift Solenoid #2 Control

C3-2

GRN/YEL

TCC Solenoid Control

C3-3

RED

TR Switch R Position Signal

C3-4

ORN/GRN

TR Switch P Position Signal

C3-5

ORN/WHT

4WD Low Signal

C3-6

LT GRN

Shift Solenoid #1 Control

C3-7

ORN/BLK

Not Used

C3-8

BLU/GRN

A/T Input Shaft Speed Sensor Signal Low

C3-9

ORN

A/T Output Shaft Speed Sensor Signal Low

C3-10

WHT

A/T Output Shaft Speed Sensor Signal High

C3-11

BLK/ORN

4WD Signal

C3-12

YEL/GRN

TR Switch D Position Signal

C3-13

ORN/BLU

TR Switch N Position Signal

C3-14

GRY

Shaft Speed Signal Shielded Ground

C3-15

RED

Axle Actuator Control High

C3-16

BLU/YEL

A/T Input Shaft Speed Sensor Signal High

C3-17

--

Not Used

C3-18

PNK

Axle Actuator Control Low

C3-19

GRN/BLU

TR Switch L Position Signal

C3-20

GRN/ORG

TR Switch 2 Position Signal

Back View Of the PCM Connector C4


Object Number: 477056  Size: CF

Connector Part Information

    • 2.5L VIN 4 Powertrain
    • 28 Pin Gray Connector C4 with Orange Terminal Secondary Lock Insert

Pin

Wire Color

Function

C4-1

GRN/BLK

EVAP Canister Purge Valve Control

C4-2

BLK/ORN

Gound

C4-3

BLK/WHT

Ignition Positive Voltage

C4-4

LT GRN/WHT

EGR Valve Coil Control

C4-5

LT GRN

EGR Valve Coil Control

C4-6

PNK/BLK

Fuel Injector #2 Control

C4-7

PNK

Fuel Injector #1 Control

C4-8

BLK/GRN

Ground

C4-9

BLK/BLU

Ground

C4-10

BRN/YEL

Ignition Coil #4 Control

C4-11

BRN/WHT

Ignition Coil #3 Control

C4-12

BRN/BLK

Ignition Coil #2 Control

C4-13

BRN

Ignition Coil #1 Control

C4-14

PPL/BLK

IAC Valve Coil Control

C4-15

LT GRN/BLK

IAC Valve Coil Control

C4-16

LT GRN/RED

EGR Valve Coil Control

C4-17

LT GRN/YEL

EGR Valve Coil Control

C4-18

PNK/BLU

Fuel Injector #4 Control

C4-19

PNK/GRN

Fuel Injector #3 Control

C4-20

BLU/BLK

Ignition Positive Voltage

C4-21

BLU/BLK

Ignition Positive Voltage

C4-22

BLK/BRN

Ignition Coil #6 Control

C4-23

BRN/RED

Ignition Coil #5 Control

C4-24

PPL/YEL

IAC Valve Coil Control

C4-25

GRY/BLU

IAC Valve Coil Control

C4-26

BLK/YEL

Crank Signal

C4-27

GRY/BLK

Fuel Injector #6 Control

C4-28

GRY/GRN

Fuel Injector #5 Control