GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Air Suspension Dump Switch

In the center of the IP

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

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

Air Suspension Dump Valve

On the inboard side of the right frame rail, to the rear of the shock absorber crossmember

Suspension Controls Component Views in Air Suspension

Suspension Controls Connector End Views in Air Suspension

Instrument Panel Cluster (IPC)

On the left side of the IP

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

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Instrument Panel Cluster (IPC) C1 (15 cavities)

In the upper IP harness to the IPC

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

Instrument Panel Cluster (IPC) C2 (9 cavities)

In the upper IP harness to the IPC

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

Instrument Panel Cluster (IPC) C3 (17 cavities)

In the upper IP harness to the IPC

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

Instrument Panel Cluster (IPC) C4 (7 cavities)

In the upper IP harness to the IPC

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

Instrument Panel Cluster (IPC) C5 (13 cavities)

In the upper IP harness to the IPC

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

IP Fuse Block

In the right top of the IP, under the access panel

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

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Interior Lamps Dimmimg Buss

In the upper IP harness, under the crash pad, at the top of the IP, row 1

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Relay Center 1

In the right top of the IP, under the access panel

Power and Grounding Component Views in Wiring Systems

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Taillamps Relay

In the right top of the IP, under the access panel, in relay center 1

Lighting Systems Component Views in Lighting Systems

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C200 (56 cavities)

In the lower IP harness, to the front chassis harness, in the left center of the cab, in the cab interface connector

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C212 (84 cavities)

In the lower IP harness, to the upper IP harness, in the left center of the IP at the floor

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Inline Harness Connector End Views in Wiring Systems

C402 (8 cavities)

In the front chassis harness, to the rear chassis and taillamps harness, on the inboard side of the right frame rail, inboard of the batteries

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G105

On the left front of the #1 crossmember

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G404

From the rear chassis and taillamps harness, to the inboard side of the right frame rail, in the ground block, part of the negative battery cable

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P100

On the front chassis harness, under the hood, in the center of the bulkhead, in the cab interface connector housing

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Splice Pack 2

Part of the upper IP harness, under the crash pad, in the top of the IP, row 2

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Splice Pack 3

Part of the upper IP harness, under the crash pad, in the top of the IP, row 3

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S265

In the upper IP harness, in the main harness, approximately 21 cm (8.3 in) from the upper IP connector C212 (84 cavities)

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S266

In the upper IP harness

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S270

In the upper IP harness, in the main harness, approximately 4 cm (1.6 in) to the right of the speedometer

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S271

In the upper IP harness, in the main harness, approximately 19 cm (7.5 in) from the upper IP connector C212 (84 cavities)

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S286

In the lower IP harness, in the main harness, at the fuse block harness breakout

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S287

In the lower IP harness, in the main harness, approximately 22 cm (8.7 in) to the right of the fuse block harness breakout

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S319

In the lower IP harness

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S320

In the lower IP harness

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S321

In the lower IP harness

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S325

In the lower IP harness

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S328

In the lower IP harness

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S344

In the upper IP harness

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S400

In the rear chassis and taillamps harness, approximately 30 cm (11.8 in) from the engine harness connectors

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S400 (Long Wheelbase)

In the rear chassis and taillamps harness, at the main branch, approximately 10 cm (3.9 in) from the ground connectors breakout

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S400 (Low Profile)

In the rear chassis and taillamps harness, at the main branch, approximately 10 cm (3.9 in) from the ground connectors breakout

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