GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Pressure Sensor

Right hand lower front corner of the engine, on the A/C compressor high side line

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Engine Controls Connector End Views

ABS/TCC Switch

Under right hand of the instrument panel, near the top of the brake pedal

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Engine Controls Connector End Views

Camshaft Position (CMP) Sensor

Right hand rear corner of the engine, in the cam carrier, near the power steering pump

Engine Controls Component Views

Engine Controls Connector End Views

Continuously Variable Road Sensing Suspension (CVRSS) Module

Right hand rear of the passenger compartment, behind the rear seat back

Suspension Controls Component Views in Road Sensing Suspension - RSS

Suspension Controls Connector End Views in Road Sensing Suspension - RSS

Crankshaft Position (CKP) Sensor A

Center front of the engine, near base of the engine oil level indicator

Engine Controls Component Views

Engine Controls Connector End Views

Crankshaft Position (CKP) Sensor B

Center front of the engine, near base of the engine oil level indicator

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

Center rear of the engine compartment, near the power brake booster

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Under right hand of the instrument panel, near the steering column

Data Link Communications Component Views in Wiring Systems

Data Link Communications Connector End Views in Wiring Systems

Engine Coolant Temperature (ECT) Sensor

Left hand rear corner of the engine, below the exhaust gas recirculation valve

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Level Switch

Bottom front of the engine, near the A/C compressor

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Pressure Switch

Center front of the engine, near the engine oil filler adapter

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Control Solenoid

Left hand rear of the engine, on the cam cover, near the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Vent Valve

Under the center rear of the vehicle, near the rear

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

Left hand rear corner of the engine, near the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Front Heated Oxygen Sensor (HO2S)

Center front of the engine compartment, on the front exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injectors

Center top of the engine, under the intake manifold top cover

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure Sensor

Under the center of the vehicle, on top of the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Unit

Under the center rear of the vehicle, in the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Generator

Right hand front corner of the engine, near the underhood junction block

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Engine Electrical Connector End Views

Idle Air Control (IAC) Valve

Left hand of the engine, in the front of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module (ICM)

Right hand rear of the engine, on the rear cam cover

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

Right hand of the instrument panel, above the steering column

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges and Console

Intake Air Temperature (IAT) Sensor

Left hand front of the engine compartment, in the air intake duct

Engine Controls Component Views

Engine Controls Connector End Views

Knock Sensor

Center top of the engine, under the intake manifold top cover

NA

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LH Cooling Fan Motor

Left hand front of the engine compartment, behind the radiator

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Manifold Absolute Pressure (MAP) Sensor

Rear of the engine, near the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

Center left hand of the engine, on the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Park/Neutral Position (PNP) Switch

Left hand of the transaxle, below the throttle body

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Engine Controls Connector End Views

PASS-KEY. ® III Theft Deterrent Module

Right hand of the instrument panel, right of the steering column

Theft Deterrent System Component Views in Theft Deterrent

Theft Deterrent System Connector End Views in Theft Deterrent

Post Converter Heated Oxygen Sensor (HO2S)

Under the center of the vehicle, near the catalytic converter rear flange

Engine Controls Component Views

Engine Controls Connector End Views

Power Steering Pressure (PSP) Switch

Right hand rear corner of the engine compartment, below the windshield wiper motor on the high pressure power steering line

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Engine Controls Connector End Views

Powertrain Control Module (PCM)

Left hand front corner of the engine compartment, below the air cleaner

Engine Controls Component Views

Powertrain Control Module Connector End Views

Pre Converter Heated Oxygen Sensor (HO2S)

Under the center of the vehicle, near the catalytic converter front flange

Engine Controls Component Views

Engine Controls Connector End Views

Rear Heated Oxygen Sensor (HO2S)

Center rear of the engine compartment, on the rear exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Rear Junction Block

Left hand rear of the passenger compartment, under the rear seat

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

RH Cooling Fan Motor

Right hand front of the engine compartment, behind the radiator

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Throttle Position (TP) Sensor

Left hand of the engine, in the front of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Underhood Junction Block

Right hand rear of the engine compartment, near the power steering pump

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Vehicle Speed Sensor (VSS)

Right hand center of the engine compartment, on the transaxle case extension

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Engine Controls Connector End Views

C100 (20 cavities)

Transaxle harness to engine harness, left hand of the engine compartment near the thermostat housing

Harness Routing Views

in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C101 (40 cavities)

Engine harness to body harness, left hand of the engine compartment near the coolant reservoir

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C107 (2 cavities)

Starter harness to engine harness, right hand rear corner of the engine near the rear cam cover

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C127 (20 cavities)

Fuel rail harness to engine harness, left hand of the engine near the transmission fluid level indicator

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200 (30 cavities)

Instrument panel harness to body harness, under left hand of the instrument panel near the rear of the instrument panel compartment

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C201 (30 cavities)

Instrument panel harness to body harness, under right hand of the instrument panel near the accelerator pedal

Harness Routing Views

in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C420 (7 cavities)

Fuel tank harness to body harness, under right rear of the vehicle near the wheelhouse

Harness Routing Views

in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G101

Left hand of the engine compartment, below the engine coolant reservoir

Power and Grounding Component Views in Wiring Systems

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G103

Upper left hand side, below the EGR valve of the engine

Power and Grounding Component Views in Wiring Systems

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G104

Right hand of the engine compartment, below the underhood bussed electrical center

Power and Grounding Component Views in Wiring Systems

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G200

Left hand front corner of the passenger compartment, under the front of the sill trim plate

Power and Grounding Component Views in Wiring Systems

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G201

Right hand front corner of the passenger compartment, under the front of the sill trim plate

Power and Grounding Component Views in Wiring Systems

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G301

Under the left hand front corner of the rear seat

Power and Grounding Component Views in Wiring Systems

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G401

Right hand rear corner of the rear compartment, near the C403 connector

Power and Grounding Component Views in Wiring Systems

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P100

Right hand lower corner of the engine compartment block head, near the base of the strut tower

Harness Routing Views in Wiring Systems

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P101

Left hand lower corner of the engine compartment block head, near the base of the strut tower

Harness Routing Views in Wiring Systems

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P400

Right hand side of the rear compartment, near the wheelhouse

Harness Routing Views in Wiring Systems

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S110

Fuel injector harness, center top of the engine approximately 20 cm from the C127 connector

Harness Routing Views in Wiring Systems

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S111

Fuel injector harness, center top of the engine approximately 26.5 cm (10 in) from the C127 connector

Harness Routing Views in Wiring Systems

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S113

Transaxle harness, right hand of the engine approximately 50 cm (19.5 in) from the fluid pressure manual position switch

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S205

Instrument panel harness, center of the instrument panel approximately 94.5 cm (37.2 in) from the radio connector

Harness Routing Views in Wiring Systems

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S221

Instrument panel harness, right hand of the instrument panel approximately 51 cm (20 in) from C201 connector

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S222

Instrument panel harness, right hand of the instrument panel approximately 53.5 cm (21 in) from C201 connector

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S225

Instrument panel harness, center of the instrument panel approximately 65 cm (26 in) from the radio

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