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

Accelerator Pedal Position (APP) Module

Attached to the accelerator pedal

Engine Controls Component Views

Engine Controls Connector End Views

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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Boost Pressure Sensor

On the RH top of the air intake

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 Switch

Part of the multifunction control lever, on the upper LH side of the steering column

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

Electronic Brake Control Module (EBCM)

Below the radiator on the lower crossmember

Antilock Brake System Component Views in Antilock Brake System

Antilock Brake System Connector End Views in Antilock Brake System

Engine Coolant Temperature (ECT) Sensor

At the upper RH front of the engine, on the RH side of the coolant outlet tube

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Pressure Gauge Sensor and Fuel Pump Switch

At the top rear of the engine block

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

Engine Shut Off Solenoid

At the fuel injection pump, near the top front portion of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Heater

At the rear of the intake manifold, part of the fuel/water separator (filter)

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Lift Pump

At the RH frame rail, ahead of the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Prime Connector

At the engine harness breakout for C100 and C207, above the battery junction block

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

Fuel Solenoid

At the fuel injection pump, near the top front portion of the intake manifold

Engine Controls Component Views

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Fuel Solenoid Driver

At the fuel injection pump, near the top front portion of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Glowplug Controller

At the rear of the LH cylinder head

Engine Controls Component Views

Engine Controls Connector End Views

Glowplug Relay (Export)

Located by the body builder

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Engine Controls Connector End Views

Glowplugs

At both cylinder heads below the valve covers

Engine Controls Component Views

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Hazard Lamps Flasher

At the inner LH side of the steering column support bracket

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Injection Timing Stepper Motor

At the fuel injection pump, near the top front portion of the intake manifold

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

On the RH top of the air intake, near the boost pressure sensor

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

Optical Fuel Temperature Sensor

At the fuel injection pump, near the top front portion of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Powertrain Control Module (PCM)

On the LH side of the driver's island

Engine Controls Component Views

Powertrain Control Module Connector End Views

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

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 the LH side of the transmission near the middle

Engine Controls Component Views

Engine Controls Connector End Views

Transmission Output Speed Sensor

On the LH side of the transmission, near the middle

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor Calibrator

Above the accelerator pedal at the RH side of the brake pedal support

Engine Controls Component Views

Engine Controls Connector End Views

Wastegate Solenoid

Above the rear of the LH cylinder head, near the glowplug controller

Engine Controls Component Views

Engine Controls Connector End Views

Water In Fuel Indicator Sensor

Part of the fuel/water separator (filter) at the rear of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

C101

Engine harness to the diesel harness, at the LH rear of the engine above the intake manifold

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C106

Engine harness to the diesel harness, at the rear of the engine above the intake manifold

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

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

C302

Diesel harness to the glowplug harness

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C402

Rear chassis harness to the fuel lift pump harness, along the LH frame rail in front of the fuel tank

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Inline Harness Connector End Views in Wiring Systems

D101

In the engine harness, 15 cm (6 in) from the breakout for the A/C compressor clutch, toward the A/C compressor clutch connector

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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

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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R204

In the IP side of the engine harness, 32 cm (13 in) from P100 toward the PCM

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S101

In the engine harness, 16 cm (7 in) from the breakout for the auxiliary engine coolant fan motor, toward P100

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S114

In the engine harness, 19 cm (8 in) from the breakout for the fuel pump relay, toward the breakout for the generator connector

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S115

In the engine harness, 35 cm (13 in) from P100 in the engine compartment

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S119

In the engine harness, 13 cm (5 in) from the breakout for G104, toward the breakout for the generator connector

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S120

In the engine harness, 13 cm (5 in) from the breakout for the fuel pump relay, toward the breakout for the generator connector

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S122/S123 (Diode Splice)

A/C diode splice in the engine harness, 15 cm (6 in) from the breakout for the A/C compressor clutch, toward the A/C compressor clutch connector

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S128

In the engine harness, 12 cm (5 in) from the glowplug controller breakout toward the wastegate solenoid breakout

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S135

In the engine harness, 7 cm (3 in) from the breakout for ground G104, toward the breakout for the generator connector

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S143

In the engine harness, 2 cm (1 in) from the breakout for C100 and C207, toward the breakout for the auxiliary engine coolant fan motor

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S150

In the engine harness, 14 cm (6 in) from P100, toward C100 and C207

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S168

In the engine harness, 4 cm (2 in) from the breakout for C207, toward P100

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S180

In the diesel engine assembly harness, approximately 48 cm (19 in) from connector C101 toward the engine speed sensor

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S181

In the diesel engine assembly harness, approximately 20 cm (8 in) from connector C101 toward the fuel heater

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S182

In the diesel engine assembly harness, approximately 24 cm (9 in) from connector C101 toward the fuel heater

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S185

In the diesel engine assembly harness, approximately 41 cm (16 in) from the connector C101 toward the engine speed sensor

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S186

In the diesel engine assembly harness, approximately 35 cm (14 in) from connector C101 toward the engine speed sensor

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S187

In the diesel engine assembly harness, 22 cm (9 in) from connector C101 toward the engine speed sensor

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S200

In the IP side of the engine harness, 8 cm (3 in) from the breakout for the turn signal switch connector, toward P100

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S202

In the IP side of the engine harness, 7 cm (3 in) from the breakout for the wiper switch, toward P100

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S204

In the IP harness, 16 cm (6 in) from the horn relay breakout, toward P100

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S204 (Export)

In the IP side of the engine harness, 22 cm (9 in) from P100, toward the PCM

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S211

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

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S224

In the IP side of the engine harness, 16 cm (6 in) from P100, toward the PCM

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S228

In the IP side of the engine harness, 28 cm (11 in) from P100 toward the breakout for the turn signal switch connector

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S229

In the IP side of the engine harness, 3 cm (1 in) from the breakout for the hazard flasher and the wiper switch connector toward the breakout for the data link connector

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S232

In the IP side of the engine harness, 20 cm (8 in) from P100 toward the breakout for the turn signal switch connector

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S235

In the IP side of the engine harness, 23 cm (9 in) from P100 toward C200

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S400

In the rear chassis harness, approximately 10 cm (4 in) from the breakout for G400 toward the fuel level sensor

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