GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Battery

On the outboard side of the right frame rail to the rear of the engine

Engine Electrical Component Views

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Engine Wiring Harness Junction Block (Underhood Fuse Relay Center)

At the lower LH corner of the cowl

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Fuse Block

Body builder installed

Electrical Center Identification Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Generator

On the upper right side of the engine

Engine Electrical Component Views

Engine Electrical Connector End Views

Ignition Switch

On the right side of the steering column

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Park/Neutral Switch

In the left side of the transmission housing, toward the bell housing

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Powertrain Control Module (PCM)

Above the radiator, to the right of the driver island

Engine Controls Component Views in Engine Controls

Powertrain Control Module Connector End Views in Engine Controls

Starter Motor

On the lower right side of the engine

Engine Electrical Component Views

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Starter Relay

In the engine wiring harness junction block (underhood fuse relay center), outside row, at the bottom

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Starter Solenoid

On the lower right side of the engine, part of the starter motor assembly

Engine Electrical Component Views

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C100

At the lower left corner of the bulkhead; the IP harness end is attached to the bulkhead

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C101

Engine side of the bulkhead near C100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202

On top of the steering column

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G102

On the front center of the engine, at the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G104

Rear of the RH cylinder bank

Power and Grounding Component Views in Wiring Systems

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G109

Battery negative terminal ground, at the rear of the RH cylinder bank

Power and Grounding Component Views in Wiring Systems

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P100

Main wiring pass-through on the bulkhead

Harness Routing Views in Wiring Systems

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S101

In the engine harness, 20 cm (8 in) from the generator breakout toward the fuel injector breakout

Harness Routing Views in Wiring Systems

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S102

In the engine harness, 27 cm (11 in) from the fuel injector breakout toward the generator breakout

Harness Routing Views in Wiring Systems

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S105

In the engine harness, 13 cm (5 in) from the generator breakout toward the fuel injector breakout

Harness Routing Views in Wiring Systems

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S110

In the breakout for the PCM connectors, approximately 10 cm (4 in) from the main engine harness

Harness Routing Views in Wiring Systems

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S116

In the main engine harness, 13 cm (5 in) from the breakout for the ABS system toward the engine wiring harness junction block (underhood fuse relay center)

Harness Routing Views in Wiring Systems

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S121

In the branch to the engine wiring harness junction block (underhood fuse relay center) 40 cm (16 in) from the main engine harness

Harness Routing Views in Wiring Systems

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S123

In the engine harness, 56 cm (22 in) from connector C100

Harness Routing Views in Wiring Systems

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S202

In the IP harness, approximately 16 cm (6 in) toward the IP wiring harness junction block from the breakout for the transmission range control

Harness Routing Views in Wiring Systems

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S221

In the IP harness, approximately 9 cm (3 in) toward the speedometer adapter module from the transmission controller breakout

Harness Routing Views in Wiring Systems

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S232

In the IP harness breakout for the fuse block, approximately 60 cm (24 in) from the breakout for C202 and C203

Harness Routing Views in Wiring Systems

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S234

In the IP extension harness, 19 cm (7 in) from the instrument cluster connector

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S235

In the IP extension harness, 12 cm (5 in) from the instrument cluster connector

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