GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Automatic Transmission (A/T)

Behind the engine

Transmission Controls Component Views

Transmission Controls Connector End Views

Data Link Connector (DLC)

Under the left side of the IP

Data Link Communications Component Viewsin Data Link Communications

Power and Grounding Connector End Views in Data Link Communications

Driver Information Center (DIC)

On the left side of the IP, part of the instrument panel cluster (IPC)

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

Electronic Brake Control Module (EBCM) (JE5)

On a bracket, on the left side, upper exterior bulkhead, on the top of the air brake application valve

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views in Air Antilock Brake Systems

Engine Brake Actuator Control Valve

On the left rear side of the back-of-the-cab crossmember

Engine Exhaust Brake Component Views in Engine Exhaust

Engine Exhaust Brake Connector End Views in Engine Exhaust

Engine Speed Sensor

On the upper left side of the transmission near the front

Transmission Controls Component Views

Transmission Controls Connector End Views

Exhaust Brake/ Air Interlock Relay

In the flasher/ relay center, position 2-B

Engine Exhaust Brake Component Views in Engine Exhaust

Engine Exhaust Brake Connector End Views in Engine Exhaust

Exhaust Brake Switch

On the center of the IP

Engine Exhaust Brake Component Views in Engine Exhaust

Engine Exhaust Brake Connector End Views in Engine Exhaust

Ignition 1 Relay

In the IP fuse block/ mini-relay center

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

IP Fuse Block

In the center of the IP, to the left of the instrument panel cluster (IPC)

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Multifunction Alarm

In the center of the IP harness, behind the right access panel

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

Park/ Neutral Position (PNP) and Back Up Lamps Switch

On the lower left side of the transmission

Transmission Controls Component Views

Transmission Controls Connector End Views

Park/ Neutral Position (PNP) Switch Module

Taped to the IP harness approximately 15 cm (6 in) from the IP fuse block

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Transmission Controls Connector End Views

Powertrain Control Module (PCM)

On the left rear side of the engine block

Engine Controls Component Views in Engine Controls-7.2L (Caterpillar®)

Engine Controls Connector End Views in Engine Controls-7.2L (Caterpillar®)

Speedo Adapter

In the right side of the IP under the IP fuse block/ mini-relay center

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

Stoplamp Switch (JE5)

On the brake pedal support

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Stoplamp Switch (JE3)

On the brake pedal support

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Transmission Control Module (TCM)

On the top of the dash panel, on the engine side

Transmission Controls Component Views

Transmission Controls Connector End Views

Turbine Shaft Speed (TSS) Sensor

On the middle left side of the transmission near the top

Transmission Controls Component Views

Transmission Controls Connector End Views

Upfitter Connector (C212)

Under the left side of the IP, by the left kick panel

Power and Grounding Component Views

Power and Grounding Connector End Views

Vehicle Speed Sensor (VSS)

On the rear left side of the transmission near the top

Transmission Controls Component Views

Transmission Controls Connector End Views

C107

In the IP harness, to the chassis jumper harness (JE5), approximately 33 cm (13 in) from P100

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C200

In the IP harness, to the engine harness, under the right side of the IP

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C202

In the IP harness, in the IP-to-chassis jumper harness (JE5), under the IP, 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

C218

Under the left side of the IP, near P103

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

G102

From the engine harness, to the lower right front side of the engine

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

G405

On the left frame rail, plugged into the battery positive cable junction block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

G407

On the left frame rail, plugged into the battery positive cable junction block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

P100

On the right side of the bulkhead

Power and Grounding Component Views in Wiring Systems

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P103

On the left side of the bulkhead

Power and Grounding Component Views in Wiring Systems

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S137

In the engine harness, approximately 8 cm (3 in) from the breakout for the TCM connectors

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S142

In the engine harness, approximately 4 cm (2 in)

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S169

In the engine harness, approximately 4 cm (2 in) before from the first breakout toward P100 and P103

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S210

In the IP harness, approximately 4 cm (2 in) to the right of the hazard warning switch breakout

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S220

In the IP harness, approximately 15 cm (6 in) to the right of the data link connector (DLC) breakout

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S221

In the IP harness, approximately 12 cm (5 in) to the right of the data link connector (DLC) breakout

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S222

In the IP harness, approximately 10 cm (4 in) to the right of the data link connector (DLC) breakout

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S230

In the IP harness, approximately 4 cm (2 in) from the breakout for the IPC connector

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S250

In the IP harness, approximately 4 cm (2 in) from the breakout for the Exhaust Brake/ Air Interlock Relay

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S252

In the IP harness, approximately 9 cm (4 in) from the breakout for the Exhaust Brake/ Air Interlock Relay

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S410

In the engine harness, approximately 4 cm (2 in) from the PCM Connector

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S411

In the engine harness, approximately 4 cm (2 in) from the PCM Connector

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S412

In the engine harness, approximately 4 cm (2 in) from the PCM Connector

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S413

In the engine harness, approximately 2 cm (1 in) from the TCM Connector C1

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S414

In the engine harness, approximately 2 cm (1 in) from the TCM Connector C1

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S415

In the engine harness, approximately 2 cm (1 in) from the TCM Connector C1

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S416

In the engine harness, approximately 6 cm (3 in) rearward of the breakout for the Turbine Shaft Speed Sensor

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