GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Instrument Panel Cluster (IPC)

On the left side 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

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

On 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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Speedo Adapter

Under the right seat

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

Engine Controls Connector End Views in Engine Controls 7.8L (Isuzu)

Two-Speed Rear Axle Shift Motor

On the front of the rear axle housing

Rear Axle Component Views

Rear Axle Connector End Views

Two-Speed Rear Axle Shift Relay

Mounted on the crossmember forward of the rear axle

Rear Axle Component Views

Rear Axle Connector End Views

Two-Speed Rear Axle Shift Switch (Dash Mounted) (Automatic Transmission)

In the center of the IP

Rear Axle Component Views

Rear Axle Connector End Views

Two-Speed Rear Axle Shift Switch (Shifter Mounted) (Manual Transmission)

On the transmission shift lever

Rear Axle Component Views

Rear Axle Connector End Views

Vehicle Speed Sensor (VSS) (Automatic Transmission)

In the transmission rear tailshaft housing

Engine Controls Component Views in Engine Controls 7.8L (Isuzu)

Engine Controls Connector End Views in Engine Controls 7.8L (Isuzu)

Vehicle Speed Sensor (VSS) (Manual Transmission)

In the transmission rear tailshaft housing

Engine Controls Component Views in Engine Controls 7.8L (Isuzu)

Engine Controls Connector End Views in Engine Controls 7.8L (Isuzu)

C200 (56 cavities)

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

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202 (56 cavities)

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

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C210 (16 cavities)

In the lower IP to the floor harness

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

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C219 (2 cavities)

In the lower IP harness, to the floor harness

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C402 (8 cavities)

In the front chassis harness, to the rear chassis and taillamps harness, inside the RH frame rail, inboard of the batteries

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C404 (3 cavities)

In the front chassis harness, to the rear chassis and taillamps harness, inside the RH frame rail, inboard of the batteries

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C407 (14 cavities) (Automatic Transmission)

In the front chassis harness, to the starter harness, on the bell housing mounting bracket

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C407 (14 cavities) (Manual Transmission)

In the front chassis harness, capped, on the bell housing mounting bracket

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C412 (8 cavities) (Automatic Transmission)

In the front chassis harness, to the transmission harness or connector C412 jumper, behind the engine, at the top of the bell housing

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C703 (3 cavities)

On the RH frame rail forward of the rear axle

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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G406 (Two-Speed Rear Axle and Air Brake Dryer)

In the rear chassis and taillamps harness, inboard the RH frame rail, in the ground block (part of the negative battery cable)

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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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Splice Pack 5

Part of the lower IP harness, below the left side of the IP, to the right of the steering column, row 2

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S108

In the front chassis harness, approximately 11 cm (4.3 in) to the ABS harness breakout

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S130

In the front chassis harness, approximately 17 cm (6.7 in) to the starter harness breakout

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S227

In the upper IP harness, under the IP, approximately 6 cm (2.4 in) to the left of the fuse block breakout

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S235

In the lower IP harness, in the main harness at the HVAC and turn/hazard flasher module harness breakout

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S240

In the lower IP harness

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S279

In the lower IP harness, below the IP, approximately 5 cm (2.0 in) to the right of the relay center 1 harness breakout

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S280

In the lower IP harness, in the main harness, at the frame harness breakout

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S281

In the lower IP harness, approximately 5 cm (2.0 in) toward relay center 2, from the IP harness breakout

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S282

In the lower IP harness, approximately 5 cm (2.0 in) toward relay center 2, from the IP harness breakout

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S292

In the lower IP harness, in the main harness, at the frame harness breakout

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S325

In the lower IP harness

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S328

In the lower IP harness

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S339

In the lower IP harness

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S357

In the floor harness

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S358

In the floor harness

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S703

In the two-speed axle control harness, approximately 5.0 cm (2.0 in) before the relay breakout

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