GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

At the front LH side of the engine

HVAC Component Views in HVAC Systems with A/C-Manual

HVAC Connector End Views in HVAC Systems with A/C-Manual

A/C Compressor High Pressure Cut-Off Switch

At the rear of the A/C compressor

HVAC Component Views in HVAC Systems with A/C-Manual

HVAC Connector End Views in HVAC Systems with A/C-Manual

A/C Compressor Refrigerant Pressure Switch

Located by the body builder

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HVAC Connector End Views in HVAC Systems with A/C-Manual

A/C Compressor Relay

On the RH side of the driver's island

HVAC Component Views in HVAC Systems with A/C-Manual

HVAC Connector End Views in HVAC Systems with A/C-Manual

Auxiliary Engine Coolant Fan A/C Pressure Switch

In front of the radiator, on the RH side of the auxiliary engine coolant fan

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Auxiliary Engine Coolant Fan

At the front of the engine, in front of the radiator

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Battery Junction Block

On the forward LH side of the bulkhead above P100

Power and Grounding Component Views in Wiring Systems

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Camshaft Position Sensor

In the distributor at the top rear of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Crankshaft Position Sensor

At the lower RH front of the engine, behind the crankshaft balancer pulley

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

On the radiator support bracket, left and behind the VCM

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

At the lower LH side of the steering column on the support bracket

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Distributor

At the top rear of the engine

Engine Controls Component Views

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Electronic Brake Control Module (EBCM)

Below the radiator on the lower crossmember

Antilock Brake System Component Views in Antilock Brakes

Antilock Brake System Connector End Views in Antilock Brakes

Engine Coolant Temperature (ECT) Sensor

At the top front of the engine near the thermostat housing

Engine Controls Component Views

Engine Controls Connector End Views

Evaporate Emissions Canister Purge Valve

At the LH center of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

At the front LH top of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fan Control Relay

On top of the steering column support, behind the steering column

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Fuel Pump Module

At the top center of the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Prime Connector

At the engine harness the battery junction block in the engine compartment

Engine Controls Component Views

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Fuel Pump Relay

On the RH side of the driver's island

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1

In the LH exhaust pipe ahead of the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2

In the LH exhaust pipe behind the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1

In the RH exhaust pipe ahead of the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2

In the RH exhaust pipe behind the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Idle Air Control Valve

At the RH center of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil

At the top rear of the intake manifold, near the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

On a bracket at the top rear of the intake manifold, near the ignition coil

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

Body builder installed

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

Intake Air Temperature Sensor

At the front RH side, in the engine air induction system elbow behind the remote air cleaner

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

Located by the body builder

Electrical Center Identification Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Knock Sensors

On the sides of the engine block, below the exhaust manifolds

Engine Controls Component Views

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Manifold Absolute Pressure Sensor

At the front of the intake manifold, behind the thermostat

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow Sensor

At the front RH side, in the engine air induction system elbow near the remote air cleaner

Engine Controls Component Views

Engine Controls Connector End Views

Throttle Position Sensor

At the RH center of the intake manifold near the idle air control valve

Engine Controls Component Views

Engine Controls Connector End Views

Torque Converter Clutch (TCC) and Stoplamps Switch

Above the brake pedal at the RH side of the steering column

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Transmission Input Speed Sensor

On LH side of the transmission near the middle

Engine Controls Component Views

Engine Controls Connector End Views

Transmission Output Speed Sensor

On LH side of the transmission near the middle

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Control Module

Mounted on top of the radiator support

Engine Controls Component Views

VCM Connector End Views

C107

Engine harness to the fuel injector harness, at the LH rear of the engine near the distributor

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C110

Engine harness to the ABS harness, at the front of the LH frame rail near the steering gearbox

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C115

Internal to the engine harness, 10 cm (4 in) from the breakout for the bank 2 Sensor 1 HO2S, toward the transmission

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C117

Internal to the engine harness, 10 cm (4 in) from the breakout for the generator connector

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C200

At the top front of the steering column support near the park brake pull button switch

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C300

Engine harness to the rear chassis harness, near the middle of the chassis at the outside of the LH frame rail

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C301

Engine harness to the transmission, on the LH side of the transmission near the middle

Automatic Transmission Electronic Component Views in Automatic Transmission - 4L80-E

Automatic Transmission Inline Harness Connector End View in Automatic Transmission - 4L80-E

C401

Rear chassis harness to the fuel pump module harness, along the LH frame rail next to the fuel tank

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Inline Harness Connector End Views in Wiring Systems

D101

In the engine harness, 25 cm (10 in) from the A/C compressor clutch connector

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G103

At the rear of the RH cylinder head

Power and Grounding Component Views in Wiring Systems

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G104

At the rear of the RH cylinder head

Power and Grounding Component Views in Wiring Systems

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G108

At the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G200

Mounted to the top front of the steering column support plate

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G400

At the LH frame rail in front of the fuel tank

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P100

Main wiring pass through at the bulkhead

Harness Routing Views in Wiring Systems

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R102

In the engine harness breakout for the PCM, 20 cm (8 in) from the main harness toward the fuel pump relay

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S101

In the engine harness, 19 cm (8 in) from the breakout for C100 and C207, toward the auxiliary engine coolant fan motor

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S102

In the engine harness, 45 cm (18 in) from P100 toward breakout for the mass air flow sensor

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S114

In the engine harness, 44 cm (17 in) from the breakout for the A/C compressor clutch and the EGR valve, toward P100

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S115

In the engine harness, 14 cm (6 in) from the breakout for C100 and C207, toward the the breakout for the MAF sensor

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S116

In the engine harness, 32 cm (12 in) from the breakout for C100 and C207, toward the breakout for the MAF sensor

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S118

In the engine harness, 21 cm (8 in) from the breakout for the A/C compressor clutch and the EGR valve, toward P100

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S119

In the engine harness, 4 cm (2 in) from the breakout for the A/C compressor clutch and the EGR valve, toward P100

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S120

In the engine harness, 4 cm (2 in) from the breakout for the cruise control module, toward the fuel pump relay breakout

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S121

In the engine harness, 28 cm (11 in) from the breakout for the A/C compressor clutch and the EGR valve, toward the breakout for the camshaft position sensor

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S122/S123 (Diode Splice)

At diode D101 in the engine harness, 25 cm (10 in) from the A/C compressor clutch connector, toward the A/C compressor clutch breakout

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S126

In the engine harness, 18 cm (7 in) from the breakout for the A/C compressor clutch and the EGR valve, toward the VCM

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S127

In the engine harness, 28 cm (11 in) from the breakout for the A/C compressor clutch and the EGR valve, toward P100

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S131

In the engine harness, 12 cm (5 in) from the breakout for the A/C compressor clutch and the EGR valve, toward the breakout for the camshaft position sensor

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S132/S140 (Resistor Splice)

At resistor R102 in the engine harness branch for the PCM, 20 cm (8 in) from the main harness

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S133

In the engine harness, 11 cm (4 in) from the breakout for the A/C compressor clutch and the EGR valve, toward P100

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S135

In the engine harness, 28 cm (11 in) from the ignition coil breakout, toward the breakout for C300

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S143

In the engine harness, 5 cm (2 in) from the breakout for the cruise control module, toward P100

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S150

In the engine harness, 4 cm (2 in) from the breakout for the battery junction block toward the breakout for C100 and C207

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S158

In the fuel injection assembly harness

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S159

In the fuel injection assembly harness

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S170

In the engine harness, 15 cm (6 in) from the breakout for the cruise control module, toward the battery junction block

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S173

In the engine harness, 7 cm (3 in) from the breakout for the mass air flow sensor, toward the battery junction block

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S204

In the IP harness, 16 cm (6 in) from the horn relay breakout, toward the IP fuse block

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S206

In the IP harness, 25 cm (10 in) from the instrument cluster connector

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S211

In the IP harness, 6 cm (2 in) from the dimmer switch and the IP cluster connector breakout, toward the IP fuse block

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S235

In the IP side of the engine harness, 26 cm (10 in) from P100 toward C200

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S400

In the rear chassis harness, 10 cm (4 in) from the breakout for G400 toward the fuel pump module

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