GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

ABS/TCC Switch

Under the left side of the instrument panel, near the top of the brake pedal

Engine Controls Component Views

Engine Controls Connector End Views

Camshaft Position (CMP) Sensor

In the right rear corner of the engine, in the cam carrier, near the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Continuously Variable Road Sensing Suspension (CVRSS) Module

In the right rear of the passenger compartment, behind the rear seat, on the electronics bay

Suspension Controls Component Views in Road Sensing Suspension

Suspension Controls Connector End Views in Road Sensing Suspension

Crankshaft Position (CKP) Sensor A

On the center front of the engine, near base of engine oil level indicator

Engine Controls Component Views

Engine Controls Connector End Views

Crankshaft Position (CKP) Sensor B

On the center front of the engine, near base of engine oil level indicator

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

In the left rear of the engine compartment, on the left strut tower

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Under left side of the instrument panel, on the hood release bracket

Data Link Communications Component Views in Wiring Systems

Data Link Communications Connector End Views in Wiring Systems

Electronic Brake/Traction Control Module (EBTCM)

In the left front corner of the engine compartment, on the brake pressure modulator valve

Antilock Brake System Component Views in ABS/Traction Control

Antilock Brake System Connector End Views in ABS/Traction Control

Engine Coolant Temperature (ECT) Sensor

In the left rear corner of the engine, below the exhaust gas recirculation valve

Engine Controls Component Views

Engine Controls Connector End Views

Engine Cooling Fan Relay 1

In the center front of the engine compartment, on the lower radiator support, near the cooling fans

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Engine Cooling Fan Relay 2

Center front of the engine compartment, on the lower radiator support, near the cooling fans

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Engine Cooling Fan Relay 3

Center front of the engine compartment, on the lower radiator support, near the cooling fans

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Engine Oil Level Switch

On the bottom front of the engine, in the engine oil pan, near the A/C compressor

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Pressure Switch

On the center front of the engine, near the base of the engine oil level indicator

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Canister Purge Valve

On the left rear of the engine, on the cam cover, near the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Canister Vent Valve

Under the center rear of the vehicle, near the rear

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Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

On the left rear of the engine, on the cam cover, near the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injectors

On the top of the engine, below the fuel rail

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Sender

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

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Engine Controls Connector End Views

Fuel Tank Pressure Sensor

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

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Engine Controls Connector End Views

Generator

In the right front corner of the engine, near the battery

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1)

In the center rear of the engine compartment, on the rear exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 3)

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

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1)

In the center front of the engine compartment, on the front exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Idle Air Control (IAC) Valve

On the left side of the engine, on the front of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

On the right rear of the engine, on the rear cam cover, under the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

In the left side 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

In the left front of the engine compartment, in the intake duct

Engine Controls Component Views

Engine Controls Connector End Views

Knock Sensor

On the center of the engine, below the intake manifold, in the cylinder valley

Engine Controls Component Views

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LH Cooling Fan Motor

In the left front of the engine compartment, behind the radiator

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor

On the top left front of the engine, right of the throttle body

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Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

On the left center of the engine, on the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Park/Neutral Position (PNP) Switch

On the left side of the transmission, below the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Power Steering Pressure (PSP) Switch

In the center rear of the engine compartment, on the high pressure power steering line

Engine Controls Component Views

Engine Controls Connector End Views

Powertrain Control Module (PCM)

In the left front corner of the engine compartment, under the air cleaner housing

Engine Controls Component Views

Powertrain Control Module Connector End Views

Rear Compartment Fuse Block

In the left front of the rear compartment, on the electronics bay

Power and Grounding Component Views in Wiring Systems

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RH Cooling Fan Motor

In the right front of the engine compartment, behind the radiator

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

RH Underhood Fuse Block

In the left rear of the engine compartment, near the engine compartment fuse/relay center

Power and Grounding Component Views in Wiring Systems

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Throttle Position (TP) Sensor

On the left side of the engine, on the front of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Underhood Fuse Block

In the left side of the engine compartment, near the front strut tower

Power and Grounding Component Views in Wiring Systems

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Vehicle Speed Sensor (VSS)

On the right side of the transaxle, near the right engine mount

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Engine Controls Connector End Views

C100 (20 cavities)

In the engine harness to the transaxle harness, in the left front of the engine compartment, below the throttle body

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Inline Harness Connector End Views

C101 (23 cavities)

In the body harness to the engine harness, in the left side of the engine compartment, near the underhood fuse block

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C127 (20 cavities)

In the engine harness to the fuel rail harness, on left center top of the engine, below the throttle body

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C131 (2 cavities)

In the engine harness to the starter harness, on the right rear corner of the engine

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C205 (23 cavities)

In the body harness to the engine harness, under the right of the instrument panel near the instrument panel compartment

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C401 (1 cavity)

In the body harness to the body harness, in the right rear of the passenger compartment taped in the body harness

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C415 (7 cavities)

In the body harness to the fuel tank harness, under the center rear of the vehicle, near the rear suspension

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G102

In the left side of the engine compartment, on the engine, beneath the EGR valve

Harness Routing Views in Wiring Systems

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G107

On the lower left front corner of the engine, below the thermostat housing

Harness Routing Views in Wiring Systems

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G203

In the left front corner of the passenger compartment, behind the kick panel

Harness Routing Views in Wiring Systems

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G401

right rear of the passenger compartment, under the rear seat

Harness Routing Views in Wiring Systems

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P100

In the right rear of the engine compartment, near the strut tower

Harness Routing Views in Wiring Systems

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P101

In the left rear of the engine compartment, near the strut tower

Harness Routing Views in Wiring Systems

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P400

In the rear of the passenger compartment, near the electronics bay

Harness Routing Views in Wiring Systems

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P500

In front of the left front door jamb, near the door hinges

Harness Routing Views in Wiring Systems

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S110

In the fuel rail harness, approximately 26.5 cm (10.4 in) from the C127 connector

Harness Routing Views in Wiring Systems

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S111

In the fuel rail harness, approximately 20 cm (7.8 in) from the C127 connector

Harness Routing Views in Wiring Systems

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S113

In the transaxle harness, in the transaxle assembly

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S117

In the engine harness, approximately 38 cm (15 in) from the RH cooling fan motor connector

Harness Routing Views in Wiring Systems

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S118

In the engine harness, approximately 16.5 cm (6.4 in) from the powertrain control module connector breakout

Harness Routing Views in Wiring Systems

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S123

In the engine harness, approximately 4 cm (1.5 in) from the powertrain control module connector breakout

Harness Routing Views in Wiring Systems

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S124

In the engine harness, approximately 15.5 cm (6.1 in) from the powertrain control module connector breakout

Harness Routing Views in Wiring Systems

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S125

In the engine harness, approximately 4 cm (1.5 in) from the throttle position sensor connector breakout

Harness Routing Views in Wiring Systems

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S126

In the engine harness, approximately 10.5 cm (4.1 in) from the throttle position sensor connector

Harness Routing Views in Wiring Systems

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S127

In the engine harness, approximately 10 cm (3.9 in) from G102 breakout

Harness Routing Views in Wiring Systems

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S129

In the engine harness, approximately 74 cm (29.1 in) from the right cooling fan motor connector

Harness Routing Views in Wiring Systems

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S130

In the engine harness, approximately 90 cm (35.4 in) from the right cooling fan motor connector

Harness Routing Views in Wiring Systems

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S149

In the engine harness, approximately 10 cm (3.9 in) from the C101 connector breakout

Harness Routing Views in Wiring Systems

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S201

In the body harness, approximately 2.5 cm (0.9 in) from G204 breakout

Harness Routing Views in Wiring Systems

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S221

In the body harness, approximately 5 cm (2 in) from the C205 connector

Harness Routing Views in Wiring Systems

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S308

In the body harness, approximately 14 cm (5.5 in) from the P700 pass-through

Harness Routing Views in Wiring Systems

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S318

In the body harness, approximately 17 cm (6.7 in) from the SDM connector breakout

Harness Routing Views in Wiring Systems

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S505

(DeVille)

In the body harness, approximately 46 cm (18.1 in) from the C500 connector breakout

Harness Routing Views in Wiring Systems

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S505

(Eldorado)

In the body harness, approximately 6.5 cm (3.1 in) from the LH front power door connector

Harness Routing Views in Wiring Systems

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