GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

Front of A/C Compressor

HVAC Component Views

HVAC Connector End Views

A/C Compressor Enable Relay

In the underhood fuse-relay center, left front corner of engine compartment

HVAC Component Views

HVAC Connector End Views

A/C Compressor High Pressure Cutoff Switch

On the rear of A/C compressor

HVAC Component Views

HVAC Connector End Views

A/C Compressor Low Pressure Cutout Switch

In the low pressure refrigerant line

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Motor

LH rear corner of interior cabin, behind rear wheel house

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Motor Relay, High

LH rear corner of interior cabin, behind rear wheel house

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Motor Relay, Low

LH rear corner of interior cabin, behind rear wheel house

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Motor Relay, Medium

LH rear corner of interior cabin, behind rear wheel house

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Resistor

LH rear corner of interior cabin, behind rear wheel house

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Switch

On the IP, to the right of the steering column

HVAC Component Views

HVAC Connector End Views

Blower Motor

RH rear of engine compartment, on the cowl

HVAC Component Views

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Blower Motor Resistor/Relay

At HVAC control panel

HVAC Component Views

HVAC Connector End Views

Convenience Center

Under left side of IP

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Front Auxiliary HVAC Control Module

On the front of the overhead console

HVAC Component Views

HVAC Connector End Views

Heater and A/C Control Logic Module

On the front interior roof panel, behind the front auxiliary HVAC controller

HVAC Component Views

HVAC Connector End Views

Heater and A/C Controller

Center of Instrument panel

HVAC Component Views

HVAC Connector End Views

IP Fuse Block

LH lower kick panel

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Powertrain Control Module (PCM)

Left front corner of the engine compartment

Engine Controls Component Views in Engine Controls - 6.5L

Powertrain Control Module Connector End Views in Engine Controls - 6.5L

Rear Auxiliary HVAC Control Module

In the left rear of the interior, behind the wheel housing

HVAC Component Views

HVAC Connector End Views

Rear Auxiliary Mode Valve and Seal Assembly

In the left rear of the interior, behind the wheel housing

HVAC Component Views

HVAC Connector End Views

Rear Auxiliary Temperature Valve Assembly

In the left rear of the interior, behind the wheel housing

HVAC Component Views

HVAC Connector End Views

Temperature Valve Actuator Motor

Under the IP, on the HVAC plenum, on the right side

HVAC Component Views

HVAC Connector End Views

Underhood Fuse-Relay Center

Engine compartment, left fender

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

VCM

Left front corner of the engine compartment

    •  Engine Controls Component Views in Engine Controls - 4.3L
    •  Engine Controls Component Views in Engine Controls - 5.0,5.7L
    •  Engine Controls Component Views in Engine Controls - 7.4L
    •  VCM Connector End Views in Engine Controls - 4.3L
    •  VCM Connector End Views in Engine Controls - 5.0,5.7L
    •  VCM Connector End Views in Engine Controls - 7.4L

C100

LH rear of engine compartment at bulkhead

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202

LH body harness under LH side of IP near brake pedal at convenience center

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C219

LH body harness under LH side of IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C405

In the left B pillar of the interior of the cabin, under the headliner, near the roof panel

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C407

LH rear corner of interior cabin, behind rear wheel house

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C408

LH rear corner of interior cabin, behind rear wheel house

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

D102

In the underhood fuse-relay center, left front corner of engine compartment

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--

G101

Engine harness, near the thermostat housing

Power and Grounding Component Views in Wiring Systems

--

G103 (Gasoline)

Engine harness rear of RH cylinder head

Power and Grounding Component Views in Wiring Systems

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G103 (Diesel)

LH front of Engine harness, near A/C compressor

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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G301

On the left frame rail, near the auxiliary battery

Power and Grounding Component Views in Wiring Systems

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G400

LH rear corner of interior cabin, behind rear wheel house.

Power and Grounding Component Views in Wiring Systems

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P101

Under RH side of Instrument panel.

Harness Routing Views in Wiring Systems

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S101 (6.5L)

Engine harness, approximately 11 cm (4 in) into C101 breakout

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--

S103 (7.4L)

Engine harness, approximately 8 cm (3 in) from ECT sensor breakout toward G101 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 (5.0,5.7L)

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

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--

S102 (6.5L)

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

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--

S120 (4.3L, 7.4L)

In the engine harness, approximately 19 cm (7 in) from the C100 breakout, toward the EGR sensor breakout

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--

S120 (5.0,5.7L)

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

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--

S120 (6.5L)

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

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--

S152 (4.3L)

Engine harness, approximately 16 cm (6 in) from fuel injector breakout toward G103 breakout

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--

S152 (5.0L, 5.7L)

Engine harness, approximately 4 cm (2 in) from fuel injector breakout toward G103 breakout

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--

S152 (7.4L)

Engine harness, approximately 15 cm (6 in) from heated oxygen sensor (bank 2 sensor 1) breakout toward P101

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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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--

S215

In the IP harness, approximately 4 cm (2 in) from the radio breakout, toward the power antenna assembly breakout

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--

S249

LH body harness, approximately 20 cm (8 in) from convenience center connector C202

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--

S307

In the rear auxiliary heater and A/C harness, approximately 29 cm (11 in) from the rear auxiliary HVAC module breakout, toward the HVAC module

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--

S318

In the auxiliary heater and A/C harness, approximately 14 cm (6 in) from the front auxiliary HVAC module breakout, toward C405

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--

S319

In the auxiliary heater and A/C harness, approximately 26 cm (10 in) from the front auxiliary HVAC module breakout, toward C405

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--

S320

In the auxiliary heater and A/C harness, approximately 57 cm (22 in) from the front auxiliary HVAC module breakout, toward C405

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--

S321

In the auxiliary heater and A/C harness, approximately 13 cm (5 in) from the rear auxiliary HVAC module breakout, toward the front HVAC module

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--

S400

In the left body harness, approximately 7 cm (3 in) from connector C404 breakout toward the center high mount stop lamp connector C419 breakout

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--

S404

in the left body harness, approximately 33 cm (13 in) from the C409 breakout, toward the C417 breakout

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--

S405

Rear A/C harness, approximately 37 cm (15 in) from blower motor breakout toward blower motor relay breakout

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S411

In the rear A/C harness, approximately 7 cm (3 in) from the o/s air valve actuator breakout, toward the blower motor breakout

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--

S412

Rear A/C harness, approximately 30 cm (12 in) from blower motor relay breakout toward blower motor breakout

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--

S413

Rear A/C harness, approximately 67 cm (26 in) from blower motor resistor connector toward blower motor breakout

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