GM Service Manual Online
For 1990-2009 cars only
Table 1: Back View of Connector C1 (Manual and 3-Speed A/T Only)
Table 2: Back View of Connector C2 (Manual and 3-Speed A/T Only)
Table 3: Back View of Connector C3 (Manual and 3-Speed A/T Only)
Table 4: Back View of Connector C1 (4-Speed AT only)
Table 5: Back View of Connector C2 (4-Speed AT only)
Table 6: Back View of Connector C3 (4-Speed AT only)
Table 7: Back View of Connector C4 (4-Speed AT only)

Back View of Connector C1 (Manual and 3-Speed A/T Only)


Object Number: 60602  Size: CF

Connector Part Information

    • 3-Speed AT and Manual Transmission only
    • 26-Pin
    • GRY

Pin

Wire Color

Function

1

RED

Camshaft Position (CMP) Actuator Solenoid Valve Control Low

2

BLK

Camshaft Position (CMP) Actuator Solenoid Valve Control High

3

BLU/YEL

Ignition Fail Safe Input

4

RED

EVAP Pressure Switching Solenoid Control

5

BLU/BLK

EVAP Canister Vent Solenoid Valve Control

6

--

Not Used

7

BLU/BLK

EVAP Canister Purge Solenoid Valve Control

8

BLU/RED

Power Steering Pressure (PSP) Switch

9

LT GRN

AC Condenser Fan Control

10

--

Not Used

11

BLK/RED

Fuel Injector 2 Control

12

YEL

Fuel Injector 1 Control

13

BRN

Ground

14

BRN

Ground

15

BLK/BLU

Idle Air Control (IAC) Valve Control Circuit

16

YEL/BLU

Fuel Pump Cut-Off Signal (SIR SDM)

17

BLU

Fuel Tank Pressure Sensor Input

18

BLK

Knock Sensor (KS) Input

19

BLK/WHT

Ignition Positive Voltage (3 Speed A/T Only)

20

RED/BLU

Ignition Trigger Signal Coil 1

21

YEL/GRN

Ignition Trigger Signal Coil 2

22

GRY

Ignition Trigger Signal Coil 3

23

WHT

Ignition Trigger Signal Coil 4

24

BLK

Fuel Injector 4 Control

25

WHT

Fuel Injector 3 Control

26

BRN

Ground

Back View of Connector C2 (Manual and 3-Speed A/T Only)


Object Number: 60590  Size: CF

Connector Part Information

    • 3-Speed AT and Manual Transmission only
    • 16-Pin
    • GRY

Pin

Wire Color

Function

1

YEL

Reference Voltage

2

GRN

Mass Air Flow (MAF) Sensor Signal High

3

YEL/BLK

Intake air Temperature (IAT) Sensor Input

4

WHT

Engine Coolant Temperature (ECT) Sensor Input

5

BLK

Crankshaft Position (CKP) Sensor Input

6

WHT

Heated Oxygen Sensor (HO2S) 1 Input

7

PNK

Heated Oxygen Sensor (HO2S) 1 Heater Circuit Control

8

BRN

Ground

9

BRN

Sensor Ground

10

BLU/WHT

Mass Air Flow (MAF) Sensor Signal Low

11

LT GRN

Throttle Position (TP) Sensor Input

12

BLK

Camshaft Position Sensor (CMP) Sensor Input

13

WHT

CMP Sensor and CKP Sensor Ground

14

RED

Heated Oxygen Sensor (HO2S) 2 Input

15

PNK

Heated Oxygen Sensor (HO2S) 2 Heater Circuit Control

16

--

Not Used

Back View of Connector C3 (Manual and 3-Speed A/T Only)


Object Number: 60597  Size: CF

Connector Part Information

    • 3-Speed AT and Manual Transmission only
    • 22-Pin
    • GRY

Pin

Wire Color

Function

1

RED/WHT

Battery Voltage

2

BLK

Electrical Load Idle-up Signal from Defogger

3

GRN

Electrical Load Idle-up Signal from Taillights

4

--

Not Used

5

RED/YEL

Malfunction Indicator Light (MIL) Control

6

BLU/WHT

Data Link Connector (Underhood) Diagnostic Request

7

BLU/WHT

Cruise Control Idle

8

--

Not Used

9

PPL/WHT

Vehicle Speed Sensor (VSS) Input

10

YEL/RED

AC On Signal

11

BLK/WHT

Crank Signal

12

BLK

Ignition Positive Voltage

13

BLK

Engine Speed Output for Tachometer

14

GRN/RED

Circuit Opening Relay Control

15-16

--

Not Used

17

WHT

Data Link Connector (DLC) Serial Data Line

18-20

--

Not Used

21

RED/BLU

AC Cutout Control

22

BLU/BLK

Cooling Fan Control

Back View of Connector C1 (4-Speed AT only)


Object Number: 621249  Size: CF

Connector Part Information

    • 4-Speed AT only
    • 31-Pin
    • WHT

Pin

Wire Color

Function

1

YEL

Fuel Injector 1 Control

2

BLK/RED

Fuel Injector 2 Control

3

WHT

Fuel Injector 3 Control

4

BLK

Fuel Injector 4 Control

5-7

--

Not Used

8

PPL

Shift Solenoid 1 Control

9

--

Not Used

10

RED/BLU

Ignition Trigger Signal Coil 1

11

YEL/GRN

Ignition Trigger Signal Coil 2

12

GRY

Ignition Trigger Signal Coil 3

13

WHT

Ignition Trigger Signal Coil 4

14-16

--

Not Used

17

BLU/BLK

EVAP Canister Vent Solenoid Valve Control

18

BLK/BLU

Idle Air Control (IAC) Valve Control

19

BLU/YEL

Torque Converter Clutch (TCC) Solenoid Control

20

BRN/YEL

Shift Solenoid 2 Control

21

BRN

Ground

22

RED

EVAP Pressure Switching Solenoid Control

23

RED

Camshaft Position (CMP) Actuator Solenoid Valve Control Low

24

BLK

Camshaft Position (CMP) Actuator Solenoid Valve Control High

25

BLU/YEL

Ignition Fail Safe Input

26

--

Not Used

27

BLK

Knock Sensor (KS) Input

28

LT GRN

AC Condenser Fan Control

29-30

--

Not Used

31

BRN

Ground

Back View of Connector C2 (4-Speed AT only)


Object Number: 621254  Size: CF

Connector Part Information

    • 4-Speed AT only
    • 24-Pin
    • WHT

Pin

Wire Color

Function

1

BLU/WHT

Mass Air Flow (MAF) Sensor Signal Low

2

YEL

Throttle Position (TP) Sensor Ground

3

PNK

Heated Oxygen Sensor (HO2S) 1 Heater Circuit Control

4

BLU/BLK

EVAP Canister Purge Solenoid Valve Control

5

--

Not Used

6

PNK

Heated Oxygen Sensor (HO2S) 2 Heater Circuit Control

7

BLU/BLK

AC Cooling Fan Relay Control

8

BRN

Ground

9

BLU

Fuel Tank Pressure Sensor Input

10

--

Not Used

11

GRN

Mass Air Flow (MAF) Sensor Signal High

12

WHT

Heated Oxygen Sensor (HO2S) 1 Input

13

--

Not Used

14

WHT

Engine Coolant Temperature (ECT) Sensor Signal

15

BLK

Camshaft Position (CMP) Sensor Input

16

BLK

Crankshaft Position (CKP) Sensor Input

17

BRN

Ground

18

BRN

Sensor Ground

19

--

Not Used

20

RED

Heated Oxygen Sensor (HO2S) 2 Input

21

--

Not Used

22

YEL/BLK

Intake Air Temperature (IAT) Sensor Input

23

LT GRN

Throttle Position (TP) Sensor Input

24

WHT

CMP Sensor and CKP Sensor Ground

Back View of Connector C3 (4-Speed AT only)


Object Number: 621256  Size: CF

Connector Part Information

    • 4-Speed AT only
    • 28-Pin
    • WHT

Pin

Wire Color

Function

1

RED/WHT

Over-Drive (OD) Cut Signal

2

RED/BLK

Park Neutral Position (PNP) Switch Position R Signal

3

LT GRN/RED

Park Neutral Position (PNP) Switch Position 2 Signal

4

LT GRN

OD Switch ON and OFF Signal

5

BLU/WHT

Data Link Connector (Underhood) Diagnostic Request

6

GRN/WHT

Brake Switch Signal

7

--

Not Used

8

YEL/BLU

Fuel Pump Cut-Off Signal (SIR SDM)

9

--

Not Used

10

BLK

Electrical Load Idle-Up Signal

11

BLK/WHT

Crank Signal

12

LT GRN/BLK

Park Neutral Position (PNP) Switch Low Signal

13

BLK/WHT

Ignition Positive Voltage

14

BLU/RED

Power Steering Pressure (PSP) Switch Signal

15-18

--

Not Used

19

LT GRN/BLU

OD Indicator Control

20

GRN

Electrical Load Idle-Up Signal

21

--

Not Used

22

PPL/WHT

Vehicle Speed Sensor (VSS) Input

23-26

--

Not Used

27

BLK

Speed Sensor Signal

28

--

Not Used

Back View of Connector C4 (4-Speed AT only)


Object Number: 621257  Size: CF

Connector Part Information

    • 4-Speed AT only
    • 22-Pin
    • WHT

Pin

Wire Color

Function

1

RED/WHT

Battery Positive Voltage

2

--

Not Used

3

GRN/RED

Circuit Opening Relay Control

4-9

--

Not Used

10

BLU/WHT

Idle Signal to Cruise Control

11

WHT

Data Link Connector (DLC) Serial Data Line

12

RED/BLU

AC Cut-Off Control

13-14

--

Not Used

15

RED/YEL

MIL Control

16

BLK

Ignition Positive Voltage

17

--

Not Used

18

YEL/RED

AC ON Signal

19-22

--

Not Used