GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Daytime Running Lamp (DRL) Control Module

Under the left side of the instrument panel (IP), taped on the IP harness

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Engine Coolant Temperature Gauge Sensor (4.3L)

On the left side of the engine

Engine Controls Component Views in Engine Controls - 4.3L

Engine Controls Connector End Views in Engine Controls - 4.3L

Engine Coolant Temperature Gauge Sensor (5.0L, 5.7L)

On the left side of the engine

Engine Controls Component Views in Engine Controls - 5.0L, 5.7L

Engine Controls Connector End Views in Engine Controls - 5.0L, 5.7L

Engine Coolant Temperature Gauge Sensor (6.5L)

On the left side of the engine

Engine Controls Component Views in Engine Controls - 6.5L

Engine Controls Connector End Views in Engine Controls - 6.5L

Engine Coolant Temperature Gauge Sensor (7.4L)

On the left side of the engine

Engine Controls Component Views in Engine Controls - 7.4L

Engine Controls Connector End Views in Engine Controls - 7.4L

Fuel Gauge

In the right side of the instrument cluster

Instrument Panel, Gages, and Console Component Views

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Fuel Pump (FP) and Sender 35 Gal.

In the fuel tank, under the rear of the vehicle

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Fuel Pump (FP) and Sender 55 Gal.

In the fuel tank, under the rear of the vehicle

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Fuel Pump Switch and Engine Oil Pressure Gauge Sensor

On the top rear of the engine

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Fuel Sender Buffer Module

Below the right side of the IP, on the inner knee bolster

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Fuel Tank Level Sender (Diesel) 35 Gal.

In the fuel tank, under the rear of the vehicle

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Fuel Tank Level Sender (Diesel) 55 Gal.

In the fuel tank, under the rear of the vehicle

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Generator (4.3L)

On the right front of the engine

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Generator (5.0L, 5.7L)

On the right front of the engine

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Generator (6.5L)

On the right front of the engine

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Generator (7.4L)

On the right front of the engine

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Generator (Ambulance Package)

On the left front of the engine

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Headlamp Dimmer Switch

Part of the turn signal lever, on the left side of the steering column

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Headlamp Switch

On the left front of the IP

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Inflatable Restraint Sensing and Diagnostic Module

Under the left front seat

SIR Component Views in SIR

SIR Connector End Views in SIR

Low Engine Coolant Indicator Lamp

In the right side of the instrument cluster, part of the instrument cluster

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Low Engine Coolant Indicator Module

Under the IP, on the left side

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Low Engine Coolant Indicator Sensor

In the front of the engine compartment, under the coolant recovery/surge tank

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Powertrain Control Module (PCM)

Behind the center of the IP

Engine Controls Component Views in Engine Controls 6.5L

Powertrain Control Module Connector End Views in Engine Controls 6.5L

Radio

In the center of the IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Vehicle Control Module (VCM) (4.3L)

In the engine compartment, on the left fender

Engine Controls Component Views in Engine Controls - 4.3L

VCM Connector End Views in Engine Controls - 4.3L

Vehicle Control Module (VCM) (5.0L, 5.7L)

In the engine compartment, on the left fender

Engine Controls Component Views in Engine Controls - 5.0L, 5.7L

VCM Connector End Views in Engine Controls - 5.0L, 5.7L

Vehicle Control Module (VCM) (7.4L)

In the engine compartment, on the left fender

Engine Controls Component Views in Engine Controls - 7.4L

VCM Connector End Views in Engine Controls - 7.4L

Vehicle Speed Sensor (VSS) Buffer

Below the left side of the IP, near the steering column

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Water-in-fuel Indicator Sensor

On the left frame rail, near the center of the vehicle

Engine Controls Component Views in Engine Controls 6.5L

Engine Controls Component Views in Engine Controls 6.5L

C100

In the left rear of the engine compartment at the bulkhead

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C101

Engine harness, on the left top of the engine

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C102

In the left side of the engine compartment, near the fender well

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C115

In the right side of the engine compartment, next to the generator

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200

Steering column harness at the base of the column

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C213

IP harness, behind the left side of the IP, near the center of the vehicle

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C301 (Gasoline Engine)

Engine harness, in line to the fuel pump harness on the left frame rail, near the EBCM

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C301 (Diesel Engine)

Engine harness, in line to the fuel pump harness on the left frame rail, near the EBCM

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G101

Engine harness, near the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G103 (4.3L)

Engine harness, at the generator bracket

Power and Grounding Component Views in Wiring Systems

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G103 (5.0L, 5.7L, 7.4L)

In the left front of the engine harness, at the A/C compressor

Power and Grounding Component Views in Wiring Systems

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G103 (6.5L)

Engine harness, at the generator bracket

Power and Grounding Component Views in Wiring Systems

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G109

In the right side of the engine compartment, near the fender well

Power and Grounding Component Views in Wiring Systems

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G201

IP harness, behind the left kick panel, near the IP fuse block

Power and Grounding Component Views in Wiring Systems

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G202

IP harness, behind the left kick panel, near the IP fuse block

Power and Grounding Component Views in Wiring Systems

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P100

In the left rear of the engine compartment, at the bulkhead

Harness Routing Views in Wiring Systems

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P101

Under the right side of the IP

Harness Routing Views in Wiring Systems

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S101 (4.3L)

In the engine harness, approximately 20 cm (8 in) from the knock sensor breakout, toward the EBCM

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S101 (5.0L, 5.7L)

In the engine harness, approximately 10 cm (4 in) from the ignition coil breakout, toward the fuel injector breakout

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S101 (6.5L)

In the engine harness, approximately 22 cm (9 in) from the optical fuel temperature breakout, toward the C100 breakout

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S101 (7.4L)

In the engine harness, approximately 5 cm (2 in) from the generator breakout, toward the C107 breakout

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S102 (4.3L)

In the engine harness, approximately 104 cm (41 in) from the underhood fuse-relay center, toward the A/C compressor breakout

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S102 (5.0L, 5.7L)

In the engine harness, approximately 4 cm (2 in) from the A/C compressor breakout, toward the MAF sensor breakout

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S102 (6.5L)

In the engine harness, approximately 4 cm (2 in) from the main harness breakout that leads to the blower motor, toward the C100 breakout

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S102 (7.4L)

In the engine harness, approximately 4 cm (2 in) from the main harness that leads to the A/C compressor breakout, toward the generator breakout

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S103 (7.4L)

In the engine harness, approximately 4 cm (2 in) from the ECT sensor breakout, toward C100

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S112

In the IP harness, approximately 40 cm (16 in) from C100, toward P102

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S118

In the forward lamp harness, approximately 22 cm (9 in) into the right forward lamp breakout

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S152 (4.3L)

In the engine harness, approximately 16 cm (6 in) from the fuel injector breakout, toward the G103 breakout

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S152 (5.0L, 5.7L)

In the engine harness, approximately 4 cm (2 in) from the fuel injector breakout, toward the G103 breakout

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S158 (6.5L)

In the engine harness, approximately 4 cm (2 in) from the G103 breakout, toward the A/C compressor

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S201

In the IP harness, approximately 4 cm (2 in) from the park brake warning switch breakout, toward the data link connector (DLC) breakout

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S202

In the IP harness, approximately 7 cm (3 in) into the VSS buffer breakout

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S216

In the IP harness, approximately 8 cm (3 in) from the C200 breakout, toward the instrument cluster breakout

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S223

In the IP harness, approximately 17 cm (7 in) from the radio breakout, toward the instrument cluster breakout

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S224

In the IP harness, approximately 40 cm (16 in) into the headlamp switch breakout

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S234

In the IP harness, approximately 42 cm (17 in) from C100, toward the park brake warning switch breakout

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S238

In the IP harness, approximately 4 cm (2 in) from the C200 breakout, toward the DLC breakout

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S246

In the IP harness, approximately 25 cm (10 in) from the HVAC switch breakout, toward the instrument cluster breakout

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S247

In the IP harness, approximately 21 cm (8 in) from the HVAC switch breakout, toward the instrument cluster breakout

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