GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

ABS/TCC Switch

Under 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

Right side 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

Right side rear of the passenger compartment, behind the rear seat, on the electronics bay

Suspension Controls Component Views in Suspension Controls

Suspension Controls Connector End Views in Suspension Controls

Crankshaft Position (CKP) Sensor A

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

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

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

Left side rear of the engine compartment, on the left hand 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)

Left side front corner of the engine compartment, on the brake pressure modulator valve

Antilock Brake System Component Views in Antilock Brakes

Antilock Brake System Connector End Views in Antilock Brakes

Engine Compartment Fuse/Relay

Center

Left side of the engine compartment, near the front strut tower

Power and Grounding Component Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Engine Coolant Temperature (ECT) Sensor

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

Engine Controls Component Views

Engine Controls Connector End Views

Engine Cooling Fan 1 Relay

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 2 Relay

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 3 Relay

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

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

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) Purge Solenoid

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

Engine Controls Component Views

Engine Controls Connector End Views

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

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

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injectors

Top of the engine, below the fuel rail

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure Sensor

Under the center of the vehicle, on the fuel tank

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Engine Controls Connector End Views

Fuel Tank Unit

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

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Engine Controls Connector End Views

Generator

Right side front corner of the engine, near the battery

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Idle Air Control (IAC) Valve

Left side of the engine, on the front of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

Right side rear of the engine, on the rear cam cover, under the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

Left side of the instrument panel, above the steering column

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

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Intake Air Temperature (IAT) Sensor

Left side front of the engine compartment, in the intake duct

Engine Controls Component Views

Engine Controls Connector End Views

Knock Sensor

Center of the engine, below the intake manifold, in the cylinder valley

Engine Controls Component Views

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LH Cooling Fan Motor

Left side 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

Top left side front of the engine, right of the throttle body

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Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

Left side center of the engine, on the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Park/Neutral Position (PNP) Switch

Left side of the transmission, below the throttle body

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Engine Controls Connector End Views

Post-Converter 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

Power Steering Pressure (PSP) Switch

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

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Engine Controls Connector End Views

Powertrain Control Module (PCM)

Left side front corner of the engine compartment, under the air cleaner housing

Engine Controls Component Views

Powertrain Control Module Connector End Views

Pre-Converter Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2)

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

Engine Controls Component Views

Engine Controls Connector End Views

Rear Compartment Fuse Block

Left side front of the rear compartment, on the electronics bay

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

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

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

Engine Controls Component Views

Engine Controls Connector End Views

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

RH MaxiFuse® Block

Left side 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

Left hand side of the engine, on the front of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS)

Right hand of the transaxle, near the right hand engine mount

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Engine Controls Connector End Views

C100 (20 cavities)

Engine harness to the transaxle harness, left side front of the engine compartment below throttle body

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Automatic Transmission Inline Harness Connector End View

C101 (23 cavities)

Body harness to the engine harness, left side of the engine compartment near the engine compartment fuse/relay center

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C127 (20 cavities)

Engine harness to the fuel rail harness, left side center top of the engine below the throttle body

Engine Controls Component Views

Automatic Transmission Inline Harness Connector End View in Automatic Transaxle - 4T80-E

C131 (2 cavities)

Engine harness to the starter harness, right side rear corner of the engine

Engine Controls Component Views

Engine Controls Connector End Views

C205 (23 cavities)

Body harness to the engine harness, under the right hand 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)

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

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C415 (7 cavities)

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

Left hand side of the engine compartment, on the engine, behind the EGR valve

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G107

Lower left side front corner of the engine, below the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G203

Left side front corner of the passenger compartment, behind the kick panel

Power and Grounding Component Views in Wiring Systems

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G401

Right side rear of the passenger compartment, under the rear seat

Harness Routing Views in Wiring Systems

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P100

Right side rear of the engine compartment, near the strut tower

Harness Routing Views in Wiring Systems

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P101

Left side rear of the engine compartment, near the strut tower

Harness Routing Views in Wiring Systems

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P400

Rear of the passenger compartment, near the electronics bay

Power and Grounding Component Views in Wiring Systems

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P500

Front of the left side 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 (7.9 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 34 cm (13.4 in) from the RH cooling fan connector.

Harness Routing Views in Wiring Systems

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S118

In the engine harness, approximately 16.5 cm (6.5 in) from the powertrain control module connector breakout.

Power and Grounding Component Views in Wiring Systems

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S123

In the engine harness, approximately 4 cm (1.6 in) from the powertrain control module connector breakout.

Harness Routing Views in Wiring Systems

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S124

In the engine harness, approximately 31.5 cm (12.4 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 (1.6 in) from the throttle position sensor connector.

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 side 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 side 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 (1 in) from G204 breakout.

Harness Routing Views in Wiring Systems

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S221

In the body harness, approximately 15 cm (5.9 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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S402

In the body harness, approximately 29 cm (11.4 in) into the cross car 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 34 cm (13.4 in) from the C500 connector breakout.

Harness Routing Views in Wiring Systems

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