GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

Right side lower front of the engine, on the A/C compressor

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

Engine Controls Connector End Views

A/C Compressor Clutch Diode

Right side front of the engine, near the A/C compressor in the harness

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

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A/C Compressor Relay

Center rear of the engine compartment, below the right side maxifuse® block

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

Engine Controls Connector End Views

A/C Refrigerant Pressure Sensor

Right side front of the engine, near the A/C compressor on the hose assembly

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

Engine Controls Connector End Views

ABS/TCC Switch

Under the left side of the instrument panel, near the brake pedal

Antilock Brake System Component Views in AntiLock Brake System

Engine Controls Connector End Views

Bank #1 Knock Sensor

Lower right side rear of the engine, left of the starter motor

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

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Bank #2 Knock Sensor

Lower front of the engine, near the engine oil filter

Engine Controls Component Views in Engine Controls - 3.8L

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Body Control Module (MALL)

Under the right side of the instrument panel, near the rear of the instrument panel compartment

Body Control System Component Views in Body Control System

Body Control System Connector End Views in Body Control System

Boost Control Solenoid

Left side front of the engine, near the engine oil fill

Engine Controls Component Views

Engine Controls Connector End Views

Camshaft Position (CMP) Sensor

Right side of the engine, below the water pump

Engine Controls Component Views

Engine Controls Connector End Views

Computer Command Ride (CCR) Module

Left side front of the passenger compartment, below the left side front seat

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Crankshaft Position (CKP) Sensor

Lower right side of the engine, behind the crank pulley

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

Left side rear of the engine compartment, near the windshield wiper motor

Cruise Control Component Views in Cruise Control

Engine Controls Connector End Views

Data Link Connector (DLC)

Under the left side of the instrument panel, on the instrument panel sound insulator

Data Link Communications Component Views in Data Link Communications

Engine Controls Connector End Views

Electronic Brake and Traction Control Module (EBTCM)

Left side front of the engine compartment, near the base of the radiator support

Engine Controls Component Views

Engine Controls Connector End Views

Engine Coolant Temperature (ECT) Sensor

Left side front of the engine, near the thermostat housing

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Level Switch

Center front of the engine, in the engine oil pan

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Canister Vent Solenoid

Left side front corner of the engine compartment, on the top of the vapor canister

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Purge Valve

Right side rear of the engine, near the generator

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

Left side rear of the engine, near the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injectors

Top of the engine, in the intake runners

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Control Module

Left side front of the rear compartment, behind the rear compartment front trim

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure Sensor

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

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Engine Controls Connector End Views

Fuel Tank Unit

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

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Engine Controls Connector End Views

Generator

Right side of the engine, near the power steering pump

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Head-Up Display

Left side top of the instrument panel, under the upper instrument panel pad

Instrument Cluster and HUD Component Views in Instrument Panel, Gauges and Console

Instrument Cluster and HUD Connector End Views in Instrument Panel, Gauges and Console

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

Center rear of the engine, in the exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

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

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

Engine Controls Component Views

Engine Controls Connector End Views

Heater And A/C Control Assembly (Pontiac with C68)

Center of the instrument panel, near the radio

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HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

Heater And A/C Control Assembly C2 (Buick with C67)

Center of the instrument panel, near the radio

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HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

Heater And A/C Control Assembly C2 (Oldsmobile with C61)

Center of the instrument panel, near the radio

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HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

Heater And A/C Control Assembly C1 (Oldsmobile with C61)

Center of the instrument panel, near the radio

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HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

Heater And A/C Control Assembly C2 (Pontiac with C61)

Center of the instrument panel, near the radio

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HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

Heater and A/C Programmer (Pontiac)

Under the right side of the instrument panel, near the rear of the instrument panel compartment

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

Heater and A/C Programmer (Buick)

Under the right side of the instrument panel, near the rear of the instrument panel compartment

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

Heater and A/C Programmer (Oldsmobile)

Under the right side of the instrument panel, near the rear of the instrument panel compartment

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

HVAC Connector End Views in HVAC Automatic or HVAC Connector End Views in HVAC Manual

High-Speed Cooling Fan Relay

Center rear of the engine compartment, below the left side maxifuse® block

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

Cooling System Connector End Views in Engine Cooling

IP Fuse Block

Under the left side of the instrument panel, on the left side instrument panel sound insulator

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

IP Junction Block (IP Electrical Center)

Under the right side of the instrument panel, near the rear of the instrument panel compartment

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Idle Air Control (IAC) Valve

Left side of the engine, in the top of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module (ICM)

Right side top of the engine, under the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Intake Air Temperature (IAT) Sensor

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

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

Left side of the instrument panel, above the steering column

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Instrument Cluster and HUD Connector End Views in Instrument Panel, Gauges and Console

LH Cooling Fan Motor

Center front of the engine compartment, behind the radiator

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

LH Maxifuse® Block

Center rear of the engine compartment, near the cowl

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Low Speed Cooling Fan Relay

Center rear of the engine compartment, below the left side maxifuse® block

HVAC Component Views in HVAC Automatic or HVAC Component Views in HVAC Manual

Cooling System Connector End Views in Engine Cooling

Manifold Absolute Pressure (MAP) Sensor

Left side rear of the engine, near the exhaust gas recirculation valve

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

Center left side of the engine, on the top of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Oil Life Reset Switch

Left side side of instrument panel

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Engine Controls Connector End Views

Park/Neutral Position (PNP) Switch

Left side of the transaxle, below the exhaust gas recirculation valve

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Engine Controls Connector End Views

PASS-Key® II Theft Deterrent Module

Under the right side of the instrument panel, near the rear of the instrument panel compartment

Theft Deterrent System Component Views in Theft Deterrent

Theft Deterrent System Connector End Views in Theft Deterrent

Powertrain Control Module (PCM)

Left side front of the engine compartment, near the air cleaner housing

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Powertrain Control Module Connector End Views

Remote Indicator Bank

Left side of the instrument panel, near the instrument cluster

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Instrument Cluster and HUD Connector End Views in Instrument Custer, Gauges and Console

RH Cooling Fan Motor

Center 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

Center rear of the engine compartment, near the cowl

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Shift Select Switch

On the center console

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Engine Controls Connector End Views

Throttle Position Sensor

Center left 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 side rear of the transaxle, below the power steering pump

Engine Controls Component Views

Engine Controls Connector End Views

C100 (20 cavities)

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

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Automatic Transmission Inline Harness Connector End View in Automatic Transaxle -- 4T65-E

C101 (66 cavities)

Body harness to the engine harness, right side rear of the engine compartment near the strut tower

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C107 (8 cavities) (VIN 1)

Engine harness to the ignition harness , right side front of the engine near the ignition coils

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C107 (8 cavities) (VIN K)

Engine harness to the ignition harness , right side front of the engine near the ignition coils

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C111 (1 cavity)

Engine harness to the knock sensor harness, right side rear of the engine below the power steering pump

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C200 (116 cavities)

Body harness to the instrument panel harness, under the center of the instrument panel

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Inline Harness Connector End Views in Wiring Systems

G100 (VIN K)

Right side front of the engine, under the ignition control module bracket

Power and Grounding Component Views in Wiring Systems

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G100 (VIN 1)

Right side front of the engine, under the ignition control module bracket

Power and Grounding Component Views in Wiring Systems

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G101

Right side rear of the engine, below the power steering pump

Power and Grounding Component Views in Wiring Systems

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G104

Left side front of the engine compartment, near the air cleaner housing

Power and Grounding Component Views in Wiring Systems

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G105

Right side front of the engine compartment, near the battery

Power and Grounding Component Views in Wiring Systems

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G201

Right side front of the passenger compartment, behind the right side kick panel trim plate

Power and Grounding Component Views in Wiring Systems

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G202

Left side front of the passenger compartment, behind the left side kick panel trim plate

Power and Grounding Component Views in Wiring Systems

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P100

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

Harness Routing Views in Wiring Systems

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P101

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

Harness Routing Views in Wiring Systems

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P403

Right side front of the rear compartment, in the rear compartment floor

Harness Routing Views in Wiring Systems

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S104

In the body harness, approx 27 cm (10.6 in) into the cooling fan relay breakout

Harness Routing Views in Wiring Systems

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S106

In the engine harness, approx 6 cm (2.4 in) from the A/C compressor clutch

Harness Routing Views in Wiring Systems

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S107

In the engine harness, approx 6 cm (2.4 in) from the A/C compressor clutch

Harness Routing Views in Wiring Systems

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S110 (VIN K)

In the engine harness, approx 6.5 cm from the generator breakout

Harness Routing Views in Wiring Systems

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S110 (VIN 1)

In the engine harness, approx 6.5 cm from the generator breakout

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S114 (VIN 1)

In the engine harness, approx 11 cm (4.3 in) from the fuel injector breakout

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S114 (VIN K)

In the engine harness, approx 12 cm from the heated oxygen sensor connector breakout

Harness Routing Views in Wiring Systems

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S121 (VIN 1)

In the engine harness, approx 32 cm from C101

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S121 (VIN K)

In the engine harness, approx 32 cm (12.6 in) from C101

Harness Routing Views in Wiring Systems

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S122 (VIN 1)

In the engine harness, approx 10 cm (3.9 in) from the intake air temperature sensor

Harness Routing Views in Wiring Systems

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S122 (VIN K)

In the engine harness, approx 47 cm (18.5 in) from C101

Harness Routing Views in Wiring Systems

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S123 (VIN 1)

In the engine harness, approx 53.5 cm (2.2 in) from C101

Harness Routing Views in Wiring Systems

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S123 (VIN K)

In the engine harness, approx 53.5 cm (21.1 in) from C101

Harness Routing Views in Wiring Systems

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S124

In the body harness, approx 10 cm (3.9 in) from the electronic brake and traction control

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S126 (VIN 1)

In the engine harness, approx 13 cm (5.1 in) from the mass air flow sensor

Harness Routing Views in Wiring Systems

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S126 (VIN K)

In the engine harness, approx 18.5 cm (7.3 in) from the mass air flow sensor

Harness Routing Views in Wiring Systems

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S128

In the body harness, approx 6.5 cm (2.6 in) from the engine cooling fan breakout

Harness Routing Views in Wiring Systems

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S130 (VIN 1)

In the engine harness, approx 25.5 cm(10 in) from C101

Harness Routing Views in Wiring Systems

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S130 (VIN K)

In the engine harness, approx 25.5 cm (10 in) from C101

Harness Routing Views in Wiring Systems

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S135 (VIN K)

In the ignition control module harness, approx 18.5 cm (7.3 in) from the ignition control module

Harness Routing Views in Wiring Systems

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S135 (VIN 1)

In the ignition control module harness, approx 18.5 cm (7.3 in) from the ignition control module

Harness Routing Views in Wiring Systems

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S136 (VIN K)

In the ignition control module harness, approx 12 cm (4.7 in) from the ignition control module

Harness Routing Views in Wiring Systems

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S136 (VIN 1)

In the ignition control module harness, approx 12 cm (4.7 in) from the ignition control module

Harness Routing Views in Wiring Systems

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S206

In the instrument panel harness, approx 52.5 cm (20.7 in) from the radio breakout

Harness Routing Views in Wiring Systems

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S207

In the body harness, approx 12 cm (4.7 in) from the center instrument panel harness channel breakout

Harness Routing Views in Wiring Systems

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S221

In the body harness, approx 15.5  (6.1 in) from P100

Harness Routing Views in Wiring Systems

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S222

In the body harness, approx 15.5  (6.1 in) from P100

Harness Routing Views in Wiring Systems

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S225

In the body harness, approx 49.5 cm (19.5 in) from the top edge of the left side kick wall channel

Harness Routing Views in Wiring Systems

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S226

In the body harness, approx 31.5 cm (12.4 in) from the data link connector

Harness Routing Views in Wiring Systems

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S233

In the body harness, approx 22 cm (8.7 in) into the C101 breakout

Harness Routing Views in Wiring Systems

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S239

In the body harness, approx 26 cm (10.2 in) from the center instrument panel harness channel breakout

Harness Routing Views in Wiring Systems

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S241

In the body harness, approx 40 cm (15.7 in) from the interior lamp control module breakout

Harness Routing Views in Wiring Systems

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S246

In the body harness, approx 8 cm (3.1 in) from the interior lamp control module breakout

Harness Routing Views in Wiring Systems

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S249 (Buick)

In the instrument panel harness, approx 9 cm from the instrument cluster C1 breakout

Harness Routing Views in Wiring Systems

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S249 (Oldsmobile)

In the instrument panel harness, approx 17 cm from C200

Harness Routing Views in Wiring Systems

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S249 (Pontiac)

In the instrument panel harness, approx 3.5 cm (1.4 in) from the instrument cluster C1 breakout

Harness Routing Views in Wiring Systems

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S255

In the instrument panel harness, approx 7 cm from the instrument cluster C1 breakout

Harness Routing Views in Wiring Systems

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S256

In the body harness, approx 33.5 cm from the interior lamp control module breakout

Harness Routing Views in Wiring Systems

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S265

In the instrument panel harness, approx 5 cm (2 in) from the instrument cluster C1 breakout

Harness Routing Views in Wiring Systems

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S270

In the body harness, approx 8 cm (3.1 in) from the edge of the right side instrument panel harness channel end

Harness Routing Views in Wiring Systems

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S271

In the body harness, approx 12 cm (4.7 in) into the C101 breakout

Harness Routing Views in Wiring Systems

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S273

In the body harness, approx 17 cm (6.7 in) into the C101 breakout

Harness Routing Views in Wiring Systems

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S276

In the instrument panel harness, approx 142.5 cm (56.1 in) from C200

Harness Routing Views in Wiring Systems

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S278

In the body harness, approx 42.5 cm (16.7 in) from the remote function actuator module breakout

Harness Routing Views in Wiring Systems

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S279

In the body harness, approx 2 cm (0.8 in) from the edge of the right side instrument panel harness channel end

Harness Routing Views in Wiring Systems

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S284

In the body harness, approx 27 cm (10.6 in) from the interior lamp control module breakout

Harness Routing Views in Wiring Systems

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S415

In the body harness, approx 22.5 cm (8.6 in) from P403

Harness Routing Views in Wiring Systems

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SP340

In the body harness, at the left front corner of the floor pan, taped inside the wiring harness

Harness Routing Views in Wiring Systems

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