GM Service Manual Online
For 1990-2009 cars only
Table 1: A/C High Pressure Recirculation Switch
Table 2: A/C High Pressure Switch
Table 3: A/C Low Pressure Switch
Table 4: Accelerator Pedal Position (APP) Sensor
Table 5: Baro Sensor
Table 6: Camshaft Position (CMP) Sensor
Table 7: Coolant Level Switch
Table 8: Crankshaft Position (CKP) Sensor
Table 9: Engine Coolant Temperature (ECT) Sensor
Table 10: Fuel Injector # 1, #3 (RF Bank)
Table 11: Fuel Injector # 2, #4 (LF Bank)
Table 12: Fuel Injector # 5, #7 (RR Bank)
Table 13: Fuel Injector # 6, #8 (LR Bank)
Table 14: Fuel Level Sensor - Secondary
Table 15: Fuel Pump
Table 16: Fuel Pump and Sender Assembly
Table 17: Fuel Rail Pressure (FRP) Regulator
Table 18: Fuel Rail Pressure (FRP) Sensor
Table 19: Fuel Temperature Sensor
Table 20: Glow Plug/Intake Heater Relay Assembly
Table 21: Intake Air Temperature (IAT) Sensor/ Mass Air Flow (MAF) Sensor
Table 22: Park/Neutral Position Switch - C1
Table 23: Park/Neutral Position Switch - C2
Table 24: Power Take Off (PTO) Relay
Table 25: Power Take Off (PTO) Switch

A/C High Pressure Recirculation Switch


Object Number: 684829  Size: CH

Connector Part Information

    • 12124037
    • 2-Way F Metri-Pack 150 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

604

A/C High Pressure Recirculation Switch Signal

B

BLK

150

Ground

A/C High Pressure Switch


Object Number: 684869  Size: CH

Connector Part Information

    • 12186386
    • 2-Way F Metri-Pack 150 P2S (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT BLU

203

A/C Request Signal

B

DK GRN/WHT

2523

A/C Request Signal

A/C Low Pressure Switch


Object Number: 537107  Size: CH

Connector Part Information

    • 12052644
    • 2-Way F Metri-Pack 150 Series Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

DK GRN

603

A/C Low Pressure Switch Signal

B

BLK

550

Ground

Accelerator Pedal Position (APP) Sensor


Object Number: 366097  Size: CH

Connector Part Information

    • 15318071
    • 10-Way F Metri-Pack 150 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

GRY

1273

Low Reference

B

PPL

1272

Low Reference

C

LT BLU

1162

APP Sensor 2 Signal

D

TAN

1274

5 Volt Reference

E

BRN

971

Low Reference

F

DK BLU

1161

APP Sensor 1 Signal

G

WHT/BLK

1164

5 Volt Reference

H

--

--

Not Used

J

YEL/BLK

975

5 Volt Reference

K

DK GRN

1163

APP Sensor 3 Signal

Baro Sensor


Object Number: 684840  Size: CH

Connector Part Information

    • 12129946
    • 3-Way F M/P 150 Series Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

ORN/BLK

1057

Low Reference

B

GRY/BLK

433

BARO Sensor Signal

C

WHT/BLK

2932

5 Volt Reference

Camshaft Position (CMP) Sensor


Object Number: 684840  Size: CH

Connector Part Information

    • 12129946
    • 3-Way F 150 Series Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

RED

631

12 Volt Reference

B

PNK/BLK

632

Low Reference

C

BRN/WHT

633

CMP Sensor Signal

Coolant Level Switch


Object Number: 655783  Size: CH

Connector Part Information

    • 15324243
    • 2-Way F M/P 150 Series Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

LT GRN

1478

Coolant Level Switch Signal

B

BLK

550

Ground

Crankshaft Position (CKP) Sensor


Object Number: 684840  Size: CH

Connector Part Information

    • 12129946
    • 3-Way F 150 Series Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

LT GRN

1867

12 Volt Reference

B

YEL/BLK

1868

Low Reference

C

DK BLU/WHT

1869

CKP Sensor Signal

Engine Coolant Temperature (ECT) Sensor


Object Number: 646176  Size: CH

Connector Part Information

    • 12162195
    • 2-Way F SER 150.2 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

GRY

720

Low Reference

B

YEL

410

ECT Sensor Signal

Fuel Injector # 1, #3 (RF Bank)


Object Number: 684908  Size: CH

Connector Part Information

    • 15326632
    • 4-Way F GT 280 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

ORN/BLK

--

Positive Voltage

B

LT GRN/BLK

--

Fuel Injector # 1 Control

C

ORN/WHT

--

Positive Voltage

D

LT GRN/BLK

--

Fuel Injector # 3 Control

Fuel Injector # 2, #4 (LF Bank)


Object Number: 684908  Size: CH

Connector Part Information

    • 15326632
    • 4-Way F GT 280 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

ORN/BLK

--

Positive Voltage

B

LT GRN/WHT

--

Fuel Injector # 4 Control

C

ORN/BLK

--

Positive Voltage

D

LT GRN

--

Fuel Injector # 2 Control

Fuel Injector # 5, #7 (RR Bank)


Object Number: 684908  Size: CH

Connector Part Information

    • 15326632
    • 4-Way F GT 280 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

ORN/BLK

--

Positive Voltage

B

LT GRN/RED

--

Fuel Injector # 5 Control

C

ORN/WHT

--

Positive Voltage

D

LT GRN/ORN

--

Fuel Injector # 7 Control

Fuel Injector # 6, #8 (LR Bank)


Object Number: 684908  Size: CH

Connector Part Information

    • 15326632
    • 4-Way F GT 280 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

ORN/WHT

--

Positive Voltage

B

LT GRN/GRN

--

Fuel Injector # 8 Control

C

ORN/WHT

--

Positive Voltage

D

LT GRN/PPL

--

Fuel Injector # 6 Control

Fuel Level Sensor - Secondary


Object Number: 258300  Size: CH

Connector Part Information

    • 12160563
    • 2-Way F Metri-Pack 150 Series Sealed (NAT)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

1936

Fuel Level Sensor Signal [- Secondary]

B-C

--

--

Blocked Cavity

D

ORN/BLK

510

Low Reference

Fuel Pump


Object Number: 365945  Size: CH

Connector Part Information

    • 12059450
    • 2-Way M Metri-Pack 280 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

GRY

120

Fuel Pump Supply Voltage

B

BLK

1650

Ground

B

BLK

2150

Ground

Fuel Pump and Sender Assembly


Object Number: 258300  Size: CH

Connector Part Information

    • 12160563
    • 2-Way F Metri-Pack 150 Series Sealed (NAT)

Pin

Wire Color

Circuit No.

Function

A

PPL

1589

Fuel Level Sensor Signal [- Primary]

B-C

--

--

Blocked Cavity

D

ORN/BLK

510

Low Reference

Fuel Rail Pressure (FRP) Regulator


Object Number: 784092  Size: CH

Connector Part Information

    • 1928403874
    • 2-Way F Bosch

Pin

Wire Color

Circuit No.

Function

1

PPL/WHT

2530

Fuel Pressure Regulator Solenoid Supply Voltage

2

YEL

2834

Fuel Pressure Regulator Solenoid Control

Fuel Rail Pressure (FRP) Sensor


Object Number: 886856  Size: CH

Connector Part Information

    • 12103771
    • 3-Way F (BK)

Pin

Wire Color

Circuit Number

Function

A

OG/BK

2919

Low Reference

B

YE

2918

FRP Sensor Signal

C

TN

2917

5 Volt Reference

Fuel Temperature Sensor


Object Number: 784094  Size: CH

Connector Part Information

    • 178392-6
    • 2-Way M AMP 187 Series (GRY)

Pin

Wire Color

Circuit No.

Function

1

YEL

1578

Fuel Temperature Signal

2

BRN

718

Low Reference

Glow Plug/Intake Heater Relay Assembly


Object Number: 2074408  Size: CH

Connector Part Information

    • FW-C-4F-B
    • 4-Way F (BLK)

Pin

Wire Color

Circuit No.

Function

A

YEL

505

Glow Plug Relay Control

B

PNK/YEL

--

Ground

C

PPL

985

IA Heater Relay Control

D

PNK

539

Ignition Voltage

Intake Air Temperature (IAT) Sensor/ Mass Air Flow (MAF) Sensor


Object Number: 655786  Size: CH

Connector Part Information

    • 15324447
    • 5-Way F 090II SLD (BLK)

Pin

Wire Color

Circuit No.

Function

1

BLK

552

IAT Low Reference

2

TAN

472

IAT Sensor Signal

3

PNK

239

Ignition 1 Voltage

4

GRY/BLK

2931

MAF Low Reference

5

YEL

492

MAF Sensor Signal

Park/Neutral Position Switch - C1


Object Number: 535904  Size: CH

Connector Part Information

    • 12191757
    • 4-Way F Metri-Pack 150 (LT GRY)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

771

Transmission Range Switch Signal A

B

GRY

773

Transmission Range Switch Signal C

C

WHT

776

Transmission Range Switch Signal P

D

YEL

772

Transmission Range Switch Signal B

Park/Neutral Position Switch - C2


Object Number: 535900  Size: CH

Connector Part Information

    • 12129840
    • 7-Way F Metri-Pack 150 280 (MD GRY)

Pin

Wire Color

Circuit No.

Function

A

ORN/BLK

1786

Park/Neutral - Signal

B

LT GRN

275

Park Neutral Position Switch Park Signal

C

PNK

839

Ignition 1 Voltage

D

BLK/WHT

451

Ground

E

PPL/WHT

1035

Starter Relay Coil Supply Voltage

F

LT GRN

24

Backup Lamp Supply Voltage

G

YEL

1737

Neutral Safety Switch Park/Neutral Signal

Power Take Off (PTO) Relay


Object Number: 535912  Size: CH

Connector Part Information

    • 12129716
    • 4-Way F Metri-Pack 280 FLX LK (MD GRY)

Pin

Wire Color

Circuit No.

Function

30

ORN

3440

Battery Positive Voltage

85

LT GRN

488

Power Take Off Switch - Output - Enable

86

PPL

2562

PTO - Engage Signal

87

WHT

2561

PTO Signal

Power Take Off (PTO) Switch


Object Number: 280767  Size: CH

Connector Part Information

    • 12186098
    • 8-Way F Metri-Pack 150 Series (LT GRY)

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used

B

LT GRN

488

Power Take Off Switch - Output - Enable

C

GRY

8

Instrument Panel Lamp Supply Voltage - 1

D

GRY

397

Cruise Control On Switch Signal

E

YEL

2522

PTO Status Signal

F

BLK

1850

Ground

G

DK BLU

84

Cruise Control Set/Coast Switch Signal

H

PPL/WHT

1382

LED Dimming Signal