GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

On the front of the A/C compressor, in the LF 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 Clutch Relay

In the underhood fuse-relay center, in the LR of the engine compartment, on the fender

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

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

A/C Compressor Cycling Switch

On the top RH of the A/C accumulator, in the RH of the engine compartment, on the bulkhead

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 Cutout Switch

On the rear of the A/C compressor, in the LF 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 Low Pressure Cutout Switch

On the top of the A/C compressor, in the high pressure refrigerant line

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

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

Automatic Transfer Case Control Module, Connector C1

Under the LH of the IP, near the convenience center

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Camshaft (CMP) Position Sensor

At the top rear center of the engine

  

Clutch Pedal Position (CPP) Switch

At the top of the clutch pedal

Engine Electrical Component Views

Engine Electrical Connector End Views

Convenience Center

Under the LH of the IP, on the bulkhead

Power and Grounding Component Views in wiring systems

Power and Grounding Connector End Views in Wiring Systems

Crankshaft Position (CKP) Sensor

At the lower RFof the engine block, near the crankshaft

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module (CCM)

At the LR of the engine compartment, on the bulkhead

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Under the LH of the IP, at the LH of thesteering column, mounted to the bottom of the knee bolster

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Distributor

At the center rear of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Electronic Brake Control Module (EBCM)

Near the brake master cylinder, at the LF wheelhousing

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

Electronic Variable Orifice (EVO)/Passlock Control Module

Under the center of the IP

Theft Deterrent System Component Views in Theft Deterrent

Theft Deterrent System Connector End Views in Theft Deterrent

Engine Coolant Temperature (ECT) Sensor

At the top RH of the engine, near the thermostat housing

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Evaporative (EVAP) Emissions Canister Purge Solenoid Valve

At the top RH of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative (EVAP) Emissions Canister Vent

At the LF of the EBCM, near the brake master cylinder, at the LF wheelhousing

Engine Controls Component Views i

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Solenoid

At the top of the enigne

Engine Controls Component Views

Engine Controls Connector End Views

Front Axle Actuator

At the RF of the front drive axle

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Fuel Injectors

In the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump and Sender

In the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Oil Pressure Switch and Sender

At the rear and top center of the engine, behind the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Prime Connector

In the IP harness, approximately 20 cm into the underhood fuse- relay center breakout

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure Sensor

In the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensors (HO2S)

In the exhaust pipe, in the front and back of the catalytic converters

Engine Controls Component Views

Engine Controls Connector End Views

HVAC Control Module

Part of heater controls, in the center of the IP, under the radio

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

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

Idle Air Control (IAC) Valve

Attached to the RR of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil

At the RR of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module (ICM)

At the RR of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

Under the LH end of the IP, 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 air intake duct

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

At the LH of the IP, near the LF door jamb switch

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Knock Sensor (KS)

At the LR of the engine mount, on the engine

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor

At the top RH center of the intake manifold, near the fuel injectors

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

At the air intake duct, near the air filter, at the RH of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Radio

In the center of the IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Recirculation Door Motor

Under the IP, on the HVAC plenum

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

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

Stoplamp Switch

On the top of the brake pedal

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Throttle Position (TP) Sensor

On the side of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Transfer Case Control Module (TCCM)

Under the IP, on the steering column support bracket

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Transfer Case Relay

At the RR of the engine compartment, near the center of the bulkhead

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Transfer Case Switch

At the top LH of the transfer case

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Underhood Fuse- Relay Center

At the LR of the engine compartment, on the fender

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Vehicle Control Module (VCM)

In the engine compartment, near the EBCM

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS)

At the LR of the transfer case

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) Adapter (A/T w/4WD)

Male-to-male connector adapter from the engine harness to the 4WD extension harness

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Engine Controls Connector End Views

C100

Part of the engine harness to the IP harness, in the LR of the engine compartment, at the bulkhead

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C103

Part of the engine harness to the fuel pump motor, in the LR of the engine comaprtment, under the brake master cylinder

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C105

Part of the engine harness to the fuel injectors, at the rear of the intake manifold

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C107

Part of the engine harness to the heated oxygen sensors (HO2S) harness, on the LF of the transmission

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C120

Part of the engine harness to the front axle actuator, in the rear of the engine, near the transmission

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C121 (M/T w/4WD)

Engine harness to 4WD extension harness

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Inline Harness Connector End Views in Wiring Systems

C122

On the LH of the transmission

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C130

The engine harness, inline to the tail and stop lamp extension harnes

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C200

Behind the RH of the IP, near the blower motor, in the foam wrap

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C227

At the IP harness, inline to the stoplamp switch

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C230

Behind the RH of the IP, above the HVAC evaporator housing

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

D104

Part of the engine harness, approximately 17 cm from the A/C compressor clutch connector

Harness Routing Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

G103

At the RF of the engine, near the thermostat housing

Harness Routing Views in Wiring Systems

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G104

At the top rear of the RH cylinder head

Harness Routing Views in Wiring Systems

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G105

At the RF of the engine block

Harness Routing Views in Wiring Systems

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G200

Behind the LH of the IP, below the IP fuse block, on the tie bar

Harness Routing Views in Wiring Systems

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G404

Inside the LH frame rail,near the rear crossmember

Harness Routing Views in Wiring Systems

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P100

In the LR of the engine compartment, at the bulkhead, above C100

Harness Routing Views in Wiring Systems

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P101

In the RR of the engine compartment, at the bulkhead

Harness Routing Views in Wiring Systems

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S100

The engine harness, approximately 23 cm (9 in) from the EBCM breakout, toward the taillamp harness

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S101

At the engine harness, approximately 12 cm (5.5 in) from the EBCM breakout, in the underhood fuse relay center harness breakout

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S103

The engine harness, approximately 34 cm from the fuel injector breakout, toward the taillamp harness breakout

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S104

The engine harness, approximately 12 cm (4.7 in) from the fuel injectors breakout

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S106

The engine harness, approximately 4 cm (1.5 in) from the EGR valve breakout, toward the fuel injectors breakout

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S107

The engine harness, approximately 25 cm from the EGR valve breakout, toward the taillamp harness breakout

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S108

The engine harness, approximately 11 cm (4 in) from the ignition coil breakout, toward the starter solenoid

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S111

The engine harness, approximately 7 cm (2.5 in) from the EBCM breakout

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S147

The engine harness, approximately 5 cm (2 in) from the fuel injectors breakout, toward the A/C compressor clutch breakout

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S148 (w/Leaded Fuel)

The heated oxygen sensor (HO2S) harness, approximately 7 cm (2.5 in) from the RH bank heated oxygen sensor (HO2S) breakout, toward the engine harness

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S148 (w/o Leaded Fuel)

Approximately 19 cm (7.5 in) into the heated oxygen sensor (HO2S) harness

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S149 (w/Leaded Fuel)

The heated oxygen sensor (HO2S) harness, approximately 7 cm (2.5 in) from the RH bank heated oxygen sensor (HO2S) breakout, toward the LH bank oxygen sensor

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S149 (w/o Leaded Fuel)

Approximately 25 cm (10 in) into the heated oxygen sensor (HO2S) harness

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S150

The engine harness, approximately 13 cm (5 in) from the EBCM breakout

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S151

The engine harness, approximately 7 cm (2.5 in) from the EBCM breakout

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S152

The engine harness, approximately 7 cm (2.5 in) from the EBCM breakout

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S153

The IP harness, approximately 13 cm (5 in) from P100, toward the CCM

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S161

The engine harness, approximately 30 cm 11.8 in) from the EGR valve breakout, toward the taillamp harness breakout

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S162

The engine harness, approximately 17 cm (6.5 in) from the starter solenoid breakout, toward the LH heated oxygen sensor (HO2S) breakout

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S204

The IP harness, approximately 10 cm 4 in) from the steering column harness breakout

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S212

The IP harness, approximately 8 cm (3 in) from the inflatable restraint IP module switch breakout

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S213

The IP harness, approximately 4 cm (1.5 in) from the steering column harness breakout

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S215

The IP harness, approximately 12 cm (4.5 in) from the instrument cluster breakout, toward the radio connectors breakout

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S221

The IP harness, approximately 40 cm 15 in) from the instrument cluster breakout

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S222

The IP harness, approximately 20 cm (8 in) from the inflatable restraint IP module switch breakout

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S231

The engine harness, approximately 13 cm (5 in) from the EGR valve breakout, toward the taillamp harness breakout

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S232

The engine harness, approximately 7 cm (2.5 in) into the EGR valve breakout

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S268

The IP harness, approximately 7 cm (2.5 in) from the inflatable restraint IP module switch breakout

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S272

The IP harness, approximately 4 cm (1.5 in) from the auxiliary power center breakout

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S280

The IP harness, approximately 5 cm (2 in) from the DLC breakout

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S298

The IP harness, approximately 24 cm (9.5 in) from the instrument cluster breakout, toward the radio breakout

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S314

The selectable 4WD harness, approximately 5 cm (2 in) from the transfer case relay breakout, toward the front axle actuator

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S430

The taillamp extension harness, approximately 6 cm (2.5 in) from the fuel pump harness breakout, toward C409

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