GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Battery Junction Block

On the forward LH side of the bulkhead, above P100

Power and Grounding Component Views in Wiring Systems

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Instrument Cluster

Body builder installed

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

IP Fuse Block

Located by the body builder

Electrical Center Identification Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Park Brake Actuator Position Switch

In the auto apply park brake component box at the RH frame rail, behind the transmission

Park Brake System Component Views

Park Brake System Connector End Views

Park Brake Alarm

On the IP harness, located by the body builder

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Park Brake System Connector End Views

Park Brake Alarm Relay

On the IP harness, located by the body builder

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Park Brake System Connector End Views

Park Brake Pressure Indicator Switch

In the auto apply park brake component box at the RH frame rail, behind the transmission

Park Brake System Component Views

Park Brake System Connector End Views

Park Brake Pressure Valve Solenoid

In the auto apply park brake component box at the RH frame rail, behind the transmission

Park Brake System Component Views

Park Brake System Connector End Views

Park Brake Pull Button Switch

Mounted to the IP

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Park Brake System Connector End Views

Park Brake Pump Motor

In the auto apply park brake component box at the RH frame rail, behind the transmission

Park Brake System Component Views

Park Brake System Connector End Views

Park Brake Pump Motor Relay

In the auto apply park brake component box at the RH frame rail, behind the transmission

Park Brake System Component Views

Park Brake System Connector End Views

Park Brake Pump Motor Switch

In the auto apply park brake component box at the RH frame rail, behind the transmission

Park Brake System Component Views

Park Brake System Connector End Views

Park/Neutral Position (PNP) and Backup Lamps Switch

On the LH side of the transmission, near the middle

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Park/Neutral Position (PNP) Switch Relay

Above the engine, mounted to the RH side of the driver's island

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

C103

On top of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C104

On top of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200

At the top front of the steering column support, near the park brake pull button switch

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C303

Above the auto apply park brake component box at the RH frame rail, behind the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C304

Above the auto apply park brake component box at the RH frame rail, behind the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

D300

In the auto apply park brake harness, 23 cm (9 in) from connectors C303 and C304

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D301

In the auto apply park brake harness, 18 cm (8 in) from connectors C303 and C304

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G108

On top of the thermostat housing

Power and Grounding Component Views

in Wiring Systems

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G200

Mounted to the top front of the steering column support plate

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G350

In the auto apply park brake component box at the RH frame rail, behind the transmission

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P100

Main wiring pass through at the bulkhead

Harness Routing Views in Wiring Systems

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S135 (Gas)

In the engine harness breakout for the ignition coil, 7 cm (3 in) from the main harness

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S135 (Diesel)

In the engine harness, 7 cm (3 in) from the breakout for ground G104 toward P100

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S143 (Gas)

In the engine harness, 5 cm (2 in) from the breakout for the ABS connectors C110 and C111, toward P100

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S143 (Diesel)

In the engine harness, 2 cm (1 in) from the breakout for C100 and C207, toward the cooling fan connector

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S169 (Gas)

In the engine harness, 58 cm (23 in) from passthrough P100

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S169 (Diesel)

In the engine harness, 8 cm (4 in) from the breakout for the engine coolant level switch, toward the starter relay breakout

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S190 (Diesel)

In the engine harness, 15 cm (6 in) from the branch to the engine coolant level and the A/C compressor refrigerant pressure switch, toward the branch to the starter relay and the fuel pump relay

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S203

Part of the diode splice for D201 In the IP harness, 14 cm (5 in) from the breakouts for connector C200 and the horn relay, toward the IP fuse block

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S204

In the IP harness, 16 cm (6 in) from connector C200, toward the IP fuse block

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S206

In the IP harness breakout for the instrument cluster connector, 25 cm (10 in) from the main harness

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S212

In the IP harness, 10 cm (4 in) from the breakouts for the IP cluster connector and the IP dimmer switch, toward the IP fuse block

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S230 (Gas)

In the IP side of the engine harness, 7 cm (2 in) from the breakout for the hazard lamp flasher and the windshield wiper switch, toward P100

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S231 (Gas)

In the IP side of the engine harness, 7 cm (2 in) from the breakout for the turn signal switch connector, toward P100

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S231 (Diesel)

In the IP side of the engine harness, 18 cm (7 in) from the breakout for the turn signal switch connector, toward P100

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S301/S302 (D301 Diode Splice)

In the auto apply park brake harness, 18 cm (8 in) from connectors C303 and C304

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S303/S304 (D300 Diode Splice)

In the auto apply park brake harness, 23 cm (9 in) from connectors C303 and C304

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S361

In the auto apply park brake harness, 8 cm (3 in) from the breakout for the park brake pump motor and the park brake pump relay connectors

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S362

In the auto apply park brake harness, 14 cm (5 in) from connectors C303 and C304

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S363

In the auto apply park brake harness, 12 cm (5 in) from the breakout for the park brake pump motor and the park brake pump relay connectors

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S364

In the auto apply park brake harness, 4 cm (1 in) from the breakouts for the park brake pump motor and the park brake pump relay connectors

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