GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch Coil

Attached to the LH front of the engine block, part of the A/C compressor

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HVAC Connector End Views in HVAC Systems

A/C Compressor Diode

At the A/C compressor clutch coil connector

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A/C Compressor Refrigerant Pressure Switch

LH front of the engine compartment, mounted in the A/C compressor/condenser hose, below the A/C load switch

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

A/C Compressor Relay K60

LH front of the engine compartment, in the ECM housing

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HVAC Connector End Views in HVAC Systems

A/C Load Switch

LH front of the engine compartment, mounted in the A/C compressor/condenser hose

Cooling System Component Views in Engine Cooling

HVAC Connector End Views in HVAC Systems

Accelerator Pedal Position (APP) Sensor (1 & 2)

Top of the accelerator pedal assembly

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Engine Controls Connector End Views in Engine Controls

Camshaft Position (CMP) Sensor

Front of the engine block

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Coolant Fan Test Connector

LH front of the engine compartment, in the ECM housing

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Cooling System Connector End Views in Engine Cooling

Crankshaft Position (CKP) Sensor

LH rear of the engine block

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Cruise Control Switch

LH side of the steering column, part of multifunction lever

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Cruise Control Connector End Views in Cruise Control

Cruise Control Release Switch

Attached to the brake pedal bracket, above the stoplamp switch

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Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Attached to the I/P carrier, to the left of the steering column

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Data Link Communications Connector End Views in Data Link Communications

ECM Housing

LH front of engine compartment

 

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Electronic Brake/Traction Control Module (EBTCM)

LH front of the engine compartment, mounted to the lower rail

Antilock Brake System Component Views in Antilock Brakes

Antilock Brake System Connector End Views in Antilock Brakes

Engine Controls Power Relay K43

LH front of the engine compartment, in the ECM housing

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Engine Controls Connector End Views in Engine Controls

Engine Control Module (ECM)

LH front of the engine compartment, in the ECM housing

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Engine Coolant Temperature (ECT) Sensor

Mounted in coolant bridge

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Evaporative (EVAP) Purge Solenoid Valve

RH rear of the intake manifold plenum

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Evaporative (EVAP) Tank Solenoid Valve

Front of fuel tank, attached to body frame

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Engine Controls Connector End Views in Engine Controls

Fuel Injectors (Sequential Multiport) #1 through #6

On top of engine, along each side of the intake manifold

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Fuel Pump

Underneath the rear of the vehicle, inside the fuel tank

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Engine Controls Connector End Views in Engine Controls

Fuel Pump Relay K44

LH front of the engine compartment, in the ECM housing

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Engine Controls Connector End Views in Engine Controls

Fuel Tank Pressure Sensor

Mounted on top of fuel tank

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Engine Controls Connector End Views in Engine Controls

Fuse Block

Mounted to the I/P, lower LH side of steering column

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Gauge Cluster

LH side of the I/P, just to the left and above the heater and A/C control

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

Heated Oxygen Sensor (HO2S Bank 1 Position 1)

Located in RH front pipe of the exhaust catalytic converter

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Engine Controls Connector End Views in Engine Controls

Heated Oxygen Sensor (HO2S Bank 1 Position 2)

Located in RH rear pipe of the exhaust catalytic converter

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Engine Controls Connector End Views in Engine Controls

Heated Oxygen Sensor (HO2S Bank 2 Position 1)

Located in LH front pipe of the exhaust catalytic converter

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Engine Controls Connector End Views in Engine Controls

Heated Oxygen Sensor (HO2S Bank 2 Position 2)

Located in LH rear pipe of the exhaust catalytic converter

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Engine Controls Connector End Views in Engine Controls

Heater and A/C Control

Center of I/P, above the radio

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

HVAC Connector End Views in HVAC Systems

Intake Air Temp (IAT) Sensor

IAT sensor is part of the MAF sensor, reference MAF sensor connector end view for IAT sensor pinout information

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Ignition Coil (1, 3, 5)

Mounted next to the RH camshaft cover

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Engine Controls Connector End Views in Engine Controls

Ignition Coil (2, 4, 6)

Mounted next to the LH camshaft cover

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Engine Controls Connector End Views in Engine Controls

Ignition Switch

Mounted on the upper RH side of the steering column

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Engine Electrical Connector End Views in Engine Electrical

Instrument Cluster

LH side of the I/P, above the steering column

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

Intake Plenum Switch-Over Solenoid Valve

LH rear of the engine

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Intake Resonance Switch-Over Solenoid Valve

Attached to the rear of the resonance chamber

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Knock Sensor (KS Bank 1)

RH side of the engine block

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Knock Sensor (KS Bank 2)

LH side of the engine block

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Mass Air Flow (MAF) Sensor

In the air intake passage, between the air cleaner and the resonance chamber

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Power Distribution Fuse Block

LH front of the engine compartment, attached to the ECM housing, above the battery

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Secondary Air Injection Pump

Attached to the LH front rail, under the wheelhouse

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Engine Controls Connector End Views in Engine Controls

Secondary Air Injection Pump Relay K12

LH front of the engine compartment, in the ECM housing

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Engine Controls Connector End Views in Engine Controls

Secondary Air Injection Pump Solenoid Valve

Front center of engine compartment, beneath secondary air injection switch-over valve

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Engine Controls Connector End Views in Engine Controls

Spark Plugs

Top of the engine

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Stop Lamp Switch

Attached to the brake pedal bracket, below the cruise control release switch

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Lighting Systems Connector End Views in Lighting Systems

Theft Deterrent Module

Mounted to the ignition lock cylinder on the upper RH side of the steering column

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Theft Deterrent System Connector End Views in Theft Deterrent

Throttle Position (TP) Sensor (1 & 2)

Attached to the throttle body

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Transmission Control Module (TCM)

Behind the RH side of the I/P

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Automatic Transmission Inline Harness Connector End View in Automatic Transmission

Throttle Valve Motor

Integral part of TP sensor, reference TP sensor connector end view for throttle valve motor pinout information

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Engine Controls Connector End Views in Engine Controls

C101

I/P wiring harness to ECM wiring harness, in the LH front of the engine compartment

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Inline Harness Connector End Views in Wiring Systems

C105 (white connector)

I/P wiring harness to ECM wiring harness, located at LH front of the engine compartment, just behind the battery

Wiper/Washer Component Views in Wiper/Washer System

Inline Harness Connector End Views in Wiring Systems

C106 (blue connector)

I/P wiring harness to ECM wiring harness, located at LH front of the engine compartment, just behind the battery

Wiper/Washer Component Views in Wiper/Washer System

Inline Harness Connector End Views in Wiring Systems

C110

ECM wiring harness to A/C control wiring harness, in the ECM housing

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Inline Harness Connector End Views in Wiring Systems

C112

ECM wiring harness to fuel injector wiring harness, at the top front of the engine block

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Inline Harness Connector End Views in Wiring Systems

C200A

I/P wiring harness to body wiring harness, at lower LH A-pillar

Power and Grounding Component Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200B

I/P wiring harness to body wiring harness, at lower LH A-pillar

Power and Grounding Component Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C400

Body wiring harness to fuel sender wiring harness, beneath the vehicle, near the front of the fuel tank

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Inline Harness Connector End Views in Wiring Systems

C402

Body wiring harness to fuel sender wiring harness, beneath the vehicle, near the front of the fuel tank

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G101

ECM wiring harness, attached to the negative battery cable terminal

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G102

ECM wiring harness, attached to the negative battery cable terminal

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G103

Body and I/P wiring harnesses, located at the LH front of the engine compartment, near C102, C105, and C106

Wiper/Washer Component Views in Wiper/Washer System

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G400

Body wiring harness, located in the lower LH corner of the rear compartment, near the LH stop/tail lamp

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P103

Lower LH A-pillar, forward of G200

Power and Grounding Component Views in Wiring Systems

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P104

LH engine compartment, at the front of the ECM housing

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P106

RH rear of the engine compartment

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P108

In the LH engine compartment, at the rear of the ECM housing

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P110

Rear LH corner of the engine compartment

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P400

Approximately 30 cm from the RH rear wheel speed sensor

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S103

Body wiring harness, approximately 15 cm (6 in) from branch break off for the LH headlamp, towards the EBTCM branch break off

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S104

Body wiring harness, approximately 71 cm (28 in) from P103, towards the EBTCM branch break off

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S106

Body wiring harness, approximately 38 cm (15 in) from P103, towards the EBTCM branch break off

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S109

A/C control wiring harness, located between branch break off for the cooling fan resistor and branch break off for connectors C101 and C111

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S110

A/C control wiring harness, located between branch break off for the cooling fan resistor and branch break off for connectors C101 and C111

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S120

ECM wiring harness, inside the ECM housing, approximately 7 cm (3 in) from P108, located under ECM connector C1 plastic cover

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S121

ECM wiring harness, inside the ECM housing, approximately 4 cm (2 in) from P108

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S123

ECM wiring harness, inside the ECM housing, approximately 13 cm (5 in) from P108

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S124

ECM wiring harness, inside the ECM housing, approximately 17 cm (7 in) from P108

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S127

ECM wiring harness, inside the ECM housing, approximately 3 cm (1 in) from P108

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S128

ECM wiring harness, inside the ECM housing, approximately 15 cm (6 in) from P108, in the oxygen sensor fuse branch

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S129

I/P wiring harness, approximately 34 cm (13 in) from cruise release switch and stoplamp switch branch break off, towards G201 branch break off

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S130

ECM wiring harness, inside the ECM housing, approximately 19 cm (7 in) from P108, in the oxygen sensor fuse branch

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S131

ECM wiring harness, inside the ECM housing, approximately 8 cm (3 in) from P108, in the oxygen sensor fuse branch

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S132

ECM wiring harness, inside the ECM housing, approximately 10 cm (4 in) from P108

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S150

Fuel injector wiring harness, near the C112 branch break off

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S160

A/C control wiring harness, located between branch break off for G104 and branch break off for secondary air injection relay K12

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S200

I/P wiring harness, approximately 15 cm (6 in) from cruise release switch and stoplamp switch branch break off, towards G201 branch break off

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S204

I/P wiring harness, approximately 11 cm (4 in) from P110, towards connector C200 branch break off

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S206

I/P wiring harness, approximately 22 cm (9 in) from P110, towards connector C200 branch break off

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S208

I/P wiring harness, in stop lamp switch branch break off

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S214

I/P wiring harness, approximately 17 cm (7 in) from cruise release switch and stoplamp switch branch break off, towards G201 branch break off

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S228

I/P wiring harness, approximately 12 cm (5 in) from cruise release switch and stoplamp switch branch break off, towards G201 branch break off

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S229

I/P wiring harness mounted in harness channel behind LH side of heater and A/C control unit, approximately 25 cm (10 in) from cruise release switch and stoplamp switch branch break off

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S246

I/P wiring harness, approximately 8 cm (3 in) from cruise release switch and stoplamp switch branch break off, towards G201 branch break off

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S253

I/P wiring harness, approximately 28 cm (11 in) from cruise release switch and stoplamp switch branch break off, towards G201 branch break off

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