GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Clutch Diode (D101)

In the underhood fuse block

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

A/C Compressor Clutch

At the front of the A/C compressor

Harness Routing Views in Wiring Systems

HVAC Connector End Views in HVAC

A/C Enable Relay

In the underhood fuse block

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

A/C High Pressure Cut-Off Switch

In the rear of the A/C compressor

Harness Routing Views in Wiring Systems

HVAC Connector End Views in HVAC

A/C Low Pressure Cut-Off Switch

At the top of the A/C receiver dryer

HVAC Component Views in HVAC

HVAC Connector End Views in HVAC

Automatic Transmission (A4WD)

Behind the engine

Harness Routing Views in Wiring Systems

Automatic Transmission Inline Harness Connector End View in Automatic Transmission

Automatic Transmission (RWD)

Behind the engine

Harness Routing Views in Wiring Systems

Automatic Transmission Inline Harness Connector End View in Automatic Transmission

Body Control Module (BCM)

Inside the dash, above the radio

Body Control System Component Views in Body Control Systems

Body Control System Connector End Views in Body Control Systems

Brake Pedal Position (BPP) Switch

Above the brake pedal

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Camshaft Position Sensor

On the side of the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Compass and Temperature Display Module

On the front of the overhead console toward the front of the vehicle

Driver Information System Components Views in Instrument Panel, Gauges and Console

Driver Information Systems Connector End Views in Instrument Panel, Gauges and Console

Convenience Center

On the left of the IP fuse block by the left kick panel

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Crankshaft Position Sensor

Behind and to the right of the engine crankshaft pulley

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

On the center front of the dash to the left of the windshield wiper module

HVAC Component Views in HVAC Systems - Manual

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

On the lower left side of the dash

Harness Routing Views in Wiring Systems

Data Link Communications Connector End Views in Data Link Communications

Distributor

To the rear of the engine

Harness Routing Views in Wiring Systems

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Electronic Brake Control Module (EBCM)

On the left front side of the frame to the left of the transmission

Harness Routing Views in Wiring Systems

Antilock Brake System Connector End Views in Antilock Brakes

Engine Coolant Temperature (ECT) Sensor

Left side cylinder head

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emission (EVAP) Canister Purge Valve

On the right side of the intake, next to the ignition coil

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emission (EVAP) Canister Vent Valve

Under the vehicle, left of the EVAP canister.

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

On the top of the engine, to the left of the generator

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injector #1

On top of the LH front of the engine under the manifold cover

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

Fuel Injector #2

On top of the RH front of the engine under the manifold cover

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

Fuel Injector #3

On the top of the LH center of the engine under the manifold cover

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

Fuel Injector #4

On the top of the RH center of the engine under the manifold cover

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

Fuel Injector #5

On the top of the LH rear of the engine under the manifold cover

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

Fuel Injector #6

On the top of the RH rear of the engine under the manifold cover

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

Fuel Pump Relay

In the underhood fuse block

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Fuel Pump and Sender

Inside the fuel tank

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Engine Controls Connector End Views

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

On the left front exhaust pipe

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank # 1 Sensor #3

On the exhaust pipe between the catalytic converter and the muffler

Engine Controls Component Views

Engine Controls Connector End Views

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

On the right front exhaust-pipe closest to the exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Heater Control Module (without A/C)

In the center of the dash

HVAC Component Views in HVAC Systems - Manual

HVAC Connector End Views in HVAC Systems - Manual

Heater and A/C Control Module

In the center of the dash

HVAC Component Views in HVAC Systems - Manual

HVAC Connector End Views in HVAC Systems - Manual

Idle Air Control (IAC) Valve

On top of the engine, on the left rear of the throttle body.

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil

On the top of the engine behind the generator

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

On the top of the engine in front of the coil

Harness Routing Views

Engine Controls Connector End Views

Instrument Cluster

On the left of the dash

HVAC Component Views in HVAC Systems - Manual

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

Instrument Panel (IP) Fuse Block

On the lower left side of the dash, next to the left side kick panel

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Intake Air Temperature (IAT) Sensor

On top of air intake duct.

Engine Controls Component Views

Engine Controls Connector End Views

Knock Sensor

To the left rear of distributor on Engine Block

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor

On top of the engine, near the ignition coil.

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow Sensor (MAF)

On the front of the air intake duct

Engine Controls Component Views

Engine Controls Connector End Views

Overhead Console

On the front center of the headliner

Driver Information System Components Views in Instrument Panel, Gauges and Console

Driver Information Systems Connector End Views in Instrument Panel, Gauges and Console

Park/Neutral Position and Backup Lamp Switch (A4WD)

On the left center of the transmission

Engine Electrical Component Views in Engine Electrical

Engine Controls Connector End Views in Engine Electrical

Park/Neutral Position and Backup Lamp Switch (RWD)

On the left center of the transmission

Engine Electrical Component Views in Engine Electrical

Engine Controls Connector End Views in Engine Electrical

Radio

In the center of the dash

HVAC Component Views in HVAC Systems - Manual

Entertainment Connector End Views in Entertainment

Throttle Position (TP) Sensor

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

Engine Controls Component Views

Engine Controls Connector End Views

Tow/Haul Switch

On the end of the shift lever

Theft Deterrent System Component Views in Theft Deterrent

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Underhood Fuse Block (A4WD)

On the left side of the dash, near the battery

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Underhood Fuse Block (RWD)

On the left side of the dash, near the battery

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Vehicle Control Module (VCM)

On the left side of the engine compartment on the lower side of the battery

Engine Controls Component Views

VCM Connector End Views

Vehicle Speed Sensor (VSS) (RWD)

On the right rear of the transmission

Harness Routing Views in Wiring Systems

Engine Controls Connector End Views

Vehicle Speed Sensor Shield

From the VCM to the VSS sensor harness (wrapped around the harness)

Harness Routing Views in Wiring Systems

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C100

In the left side front of the dash

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C103

On the top of the engine

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C201

In the lower half of the steering column

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C207

In the convenience center

Electrical Center Identification Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C310

In the engine harness 12.5 cm (4.9 in) from G302 breakout

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G104

In the center of the dash 31 cm (12.2 in) from the A/C low pressure cut-off switch breakout

Harness Routing Views in Wiring Systems

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G105

In the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G106

In the left rear of the engine block next to the knock sensor

Harness Routing Views in Wiring Systems

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G107

In the left rear of the engine block next to the knock sensor

Harness Routing Views in Wiring Systems

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G110

In the IP harness 32 cm (12.6 in) from C102 breakout next the battery

Harness Routing Views in Wiring Systems

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G302

In the Engine Harness 12.5 cm (4.9 in) from fuel pump breakout

Harness Routing Views in Wiring Systems

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P100

In the left side front of the dash, on the left of the bulkhead

Harness Routing Views in Wiring Systems

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S109

In the engine harness 4 cm (1.5 in) from the underhood fuse block breakout

Harness Routing Views in Wiring Systems

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S111

In the engine harness 17 cm (6.7 in) from the underhood fuse block breakout

Harness Routing Views in Wiring Systems

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S112

In the Engine Harness 10 cm (3.9  in) from forward lamps breakout toward C100

Harness Routing Views in Wiring Systems

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S114

In the engine harness 4 cm (1.6 in) from the underhood fuse block breakout

Harness Routing Views in Wiring Systems

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S115

In the engine harness 18 cm (7.1 in) from the intake air temperature sensor

Harness Routing Views in Wiring Systems

--

S116

In the engine harness 16 cm (6.3 in) from the breakout to the mass airflow sensor toward the engine

Harness Routing Views in Wiring Systems

--

S117

In the engine harness 2.5 cm (1 in) from the A/C low pressure cut-off switch breakout toward the engine

Harness Routing Views in Wiring Systems

--

S118

In the engine harness 6 cm (2.3 in) from the generator breakout toward C100

Harness Routing Views in Wiring Systems

--

S119

In the engine harness 9 cm (3.5 in) from the A/C low-pressure cut-off switch breakout toward the engine

Harness Routing Views in Wiring Systems

--

S120

In the engine harness 6 cm (2.3 in) from the generator breakout toward the ignition module breakout

Harness Routing Views in Wiring Systems

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S122

In the engine harness 12.5 cm (4.9 in) from the generator breakout toward ignition module breakout

Harness Routing Views in Wiring Systems

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S123

In the engine harness 6.5 cm (2.6 in) from the fuel injector harness breakout toward C100

Harness Routing Views in Wiring Systems

--

S124

In the engine harness 11.3 cm (4.4 in) from the oil pressure switch breakout

Harness Routing Views in Wiring Systems

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S126

In the engine harness 6.5 cm (2.6 in) from the knock sensor connector breakout toward C100

Harness Routing Views in Wiring Systems

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S127

In the engine harness 11 cm (4.3 in) from the park/neutral position and the backup lamp switch breakout toward the rear vehicle

Harness Routing Views in Wiring Systems

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S130

In the IP harness 32 cm (12.6 in) from C102 breakout

Harness Routing Views in Wiring Systems

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S151

In the engine harness 26.5 cm (10.4 in) from VCM Connector C2

Harness Routing Views in Wiring Systems

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S152

In the engine harness 20 cm (7.8 in) from VCM connector C2

Harness Routing Views in Wiring Systems

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S153

In the engine harness 26.5 cm (10.4 in) from VCM Connector C1

Harness Routing Views in Wiring Systems

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S204

In the IP harness 7 cm (2.8 in) from C100

Harness Routing Views in Wiring Systems

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S206

In the IP harness 13 cm (5.1 in) from C100

Harness Routing Views in Wiring Systems

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S210

In the IP harness 23.5 cm (9.3 in) from connector C100

Harness Routing Views in Wiring Systems

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S218

In the IP Harness 28.5 cm (11.2 in) from the instrument cluster connector.

Harness Routing Views in Wiring Systems

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S224

In the IP harness 17 cm (6.7 in) from the body control module (BCM) connectors breakout

Harness Routing Views in Wiring Systems

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S260

In the IP harness 49 cm (19.3 in) from the right kick panel connector C205

Harness Routing Views in Wiring Systems

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S333

In the engine harness 15 cm (5.9 in) from the vehicle speed sensor

Harness Routing Views in Wiring Systems

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Splice Pack #261 (SP261)

In the IP harness 20 cm (7.9 in) from relay blocks breakout toward the DLC

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications