GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

On the front of the A/C compressor, in the left front side of the engine

HVAC Component Views

HVAC Connector End Views

A/C Compressor Clutch Relay

In the Underhood Fuse Block, in the left rear side of the engine compartment, on the fender

Power and Grounding Component Views in Wiring Systems

HVAC Connector End Views

A/C Compressor Cycling Switch

On the top right of the A/C accumulator, in the right side of the engine compartment, on the bulkhead

HVAC Component Views

HVAC Connector End Views

A/C Compressor High Pressure Cutout Switch

On the rear of the A/C compressor, in the left front side of the engine

HVAC Component Views

HVAC Connector End Views

A/C Compressor Low Pressure Cutout Switch

On the top of the A/C compressor, in the high pressure refrigerant line

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Motor

Behind the right rear wheelhousing

HVAC Component Views

HVAC Connector End Views in HVAC Systems Manual

Auxiliary Blower Motor Relay, High

On the top of the auxiliary HVAC plenum, near the right rear wheelhousing

HVAC Component Views in HVAC Systems Manual

HVAC Connector End Views in HVAC Systems Manual

Auxiliary Blower Motor Relay, Low

On the top of the auxiliary HVAC plenum, near the right rear wheelhousing

HVAC Component Views

HVAC Connector End Views in HVAC Systems Manual

Auxiliary Blower Motor Relay, Medium

On the top of the auxiliary HVAC plenum, near the right rear wheelhousing

HVAC Component Views

HVAC Connector End Views

Auxiliary Blower Resistor

On the top of the auxiliary HVAC plenum, near the right rear wheelhousing

HVAC Component Views

HVAC Connector End Views

Auxiliary HVAC Control Logic Module

In the rear Overhead Console, behind the controls

HVAC Component Views

HVAC Connector End Views

Auxiliary HVAC Control Module, Front

On the front of the overhead console, near the windshield

HVAC Component Views

HVAC Connector End Views

Auxiliary HVAC Control Module, Rear

On the rear of the overhead console molding, in the headliner

HVAC Component Views

HVAC Connector End Views

Auxiliary Mode Door Motor

In the Auxiliary HVAC plenum, forward of the left rear wheelhousing

HVAC Component Views

HVAC Connector End Views

Auxiliary Temperature Door Motor

In the auxiliary HVAC plenum, near the right rear wheelhousing

HVAC Component Views

HVAC Connector End Views

Blower Motor, Front

To the right of the IP, behind the IP compartment box

HVAC Component Views

HVAC Connector End Views

Blower Motor Relay, High

Behind the IP compartment box, on the HVAC plenum

HVAC Component Views

HVAC Connector End Views

Blower Resistor

On top of the HVAC plenum

HVAC Component Views

HVAC Connector End Views

Convenience Center

Under the left side of the IP, on the bulkhead

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

HVAC Control Module

Part of the heater controls, in the center of the IP, under the radio

HVAC Component Views in HVAC Systems Manual

HVAC Connector End Views in HVAC Systems Manual

IP Fuse Block

To the left of the IP, near the left front door jamb switch

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Mode Door Motor

Under the IP, on the left side of the HVAC plenum

HVAC Component Views

HVAC Connector End Views

Powertrain Control Module (PCM) (Diesel)

Under RH end of IP, above Blower Motor, behind IP Compartment Box

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

Recirculation Door Motor

Under the IP, on the HVAC plenum

HVAC Component Views

HVAC Connector End Views

Temperature Door Motor

Under the IP, on the center of the HVAC plenum

HVAC Component Views

HVAC Connector End Views

Underhood Fuse Block

In the left rear side of the engine compartment, on the fender

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Vehicle Control Module (VCM) (Gas)

Engine Compartment, near EBCM

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views (5.7L) or Engine Controls Connector End Views (7.4L)

C100

IP harness inline to the Engine harness, in the left rear side of the engine compartment, at the bulkhead

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200

IP harness inline to the Engine harness, behind the right side of the IP, near the heater motor

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C203

IP harness inline to the front HVAC harness, behind the right side of the IP, near the heater motor, in foam wrap

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C205

At the convenience center

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C230

IP harness inline to the HVAC harness, above the HVAC evaporator housing

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C300

Front to Rear Body harness inline to Auxiliary A/C switches, in the overhead console

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C400

Front to Rear Body harness inline to the Auxiliary HVAC harness, at the right rear of the vehicle, above the auxiliary blower motor

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C401

Front to Rear Body harness inline to the Auxiliary HVAC harness, at the right rear of the vehicle, above the auxiliary blower motor

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

D104 ( 5.7L)

Part of the engine harness, approximately 20 cm (8 in) from the A/C compressor clutch connector

Harness Routing Views in Wiring Systems

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D104 (6.5L)

Part of the engine harness, approximately 28 cm (11 in) from the A/C compressor clutch connector

Harness Routing Views in Wiring Systems

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D104 (7.4L)

Part of the engine harness, approximately 17 cm (6.5 in) from the A/C compressor clutch connector

Harness Routing Views in Wiring Systems

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G103 (Gas)

On the right front side of the engine, near the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G104 (5.7L)

Backside of the right cylinder head

Power and Grounding Component Views in Wiring Systems

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G104 (6.5L)

Top rear of the right cylinder head

Power and Grounding Component Views in Wiring Systems

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G104 (7.4L)

Backside of the engine block, below the right cylinder head

Power and Grounding Component Views in Wiring Systems

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G105 (Gas)

On the right front side of the engine block

Power and Grounding Component Views in Wiring Systems

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G105 (Diesel)

Right Rear of the cylinder head, cylinder # 7 intake bolt

Power and Grounding Component Views in Wiring Systems

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G200

Behind the left side of the IP, below the fuse block, on the tie bar

Power and Grounding Component Views in Wiring Systems

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G202

On the right side of the instrument panel, mounted to the HVAC plenum bracket

Power and Grounding Component Views in Wiring Systems

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G400 (Utility)

On the right side D-Pillar, near the Liftgate

Power and Grounding Component Views in Wiring Systems

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P101

In the right rear side of the engine compartment, at the bulkhead

Harness Routing Views in Wiring Systems

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S103 (5.7L)

Engine harness, approx. 8 cm (3 in) from EGR valve breakout, toward taillamp harness breakout

Harness Routing Views in Wiring Systems

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S103 (6.5L)

Engine harness, approx. 12 cm (4.7 in) from starter solenoid breakout, towards the Underhood Lamp harness breakout

Harness Routing Views in Wiring Systems

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S103 (7.4L - A/T)

Engine harness, approx. 8 cm (3 in) from the EGR Valve harness breakout, towards the Ignition Coil harness breakout

Harness Routing Views in Wiring Systems

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S103 (7.4L - M/T)

Engine Harness, approx. 4 cm (1.5 in) from the Fuel Injector harness breakout, towards the Taillamp harness breakout

Harness Routing Views in Wiring Systems

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S107 (5.7L)

Engine harness, approx. 20 cm (8 in) from EGR valve breakout, toward taillamp harness breakout

Harness Routing Views in Wiring Systems

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S107 (6.5L, HD)

Engine harness, approx. 40 cm (15 in) from EBCM breakout, toward Transmission harness breakout

Harness Routing Views in Wiring Systems

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S107 (7.4L)

Engine harness, approx. 18 cm (7 in) from EBCM breakout, toward the EGR harness breakout

Harness Routing Views in Wiring Systems

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S110 (5.7L)

Engine harness, approx. 23 cm (9 in) from EBCM breakout, toward taillamp harness

Harness Routing Views in Wiring Systems

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S110 (6.5L)

Engine harness, approx. 4 cm (1.5 in) from the EBCM breakout, towards the Taillamp harness breakout

Harness Routing Views in Wiring Systems

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S110 (7.4L-A/T)

Engine harness, approx. 26 cm (10 in) from EBCM breakout, near taillamp harness breakout

Harness Routing Views in Wiring Systems

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S146 (7.4L)

Engine harness, approx. 22 cm (8.5 in) into the Underhood Fuse Relay Center harness

Harness Routing Views in Wiring Systems

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S147 (Gas)

Engine harness, approx. 5 cm (2 in) from EGR valve breakout, toward taillamp harness breakout

Harness Routing Views in Wiring Systems

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S147 (Diesel)

Engine harness, approx. 4 cm (1.5 in) from starter motor solenoid breakout

Harness Routing Views in Wiring Systems

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S185

At Diode D104

Harness Routing Views in Wiring Systems

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S186

At Diode D104

Harness Routing Views in Wiring Systems

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S212

IP harness, approx. 8 cm (3 in) from inflatable restraint switch breakout

Harness Routing Views in Wiring Systems

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S244

HVAC Harness, approx. 8 cm (3 in) from recirculation door breakout, toward high blower motor relay

Harness Routing Views in Wiring Systems

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S268

IP harness, approx. 7 cm (2.5 in) into the HVAC Control Switch harness breakout

Harness Routing Views in Wiring Systems

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S298

IP harness, approx. 24 cm (9.5 in) from instrument cluster breakout, toward radio breakout

Harness Routing Views in Wiring Systems

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S307 (4-Door Utility)

Rear HVAC control harness, approx. 10 cm (4 in) from auxiliary HVAC control logic module breakout, toward front auxiliary HVAC control module

Harness Routing Views in Wiring Systems

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S308 (4-Door Utility)

Rear HVAC control harness, approx. 5 cm (2 in) from auxiliary HVAC control logic module breakout, toward rear auxiliary HVAC control module

Harness Routing Views in Wiring Systems

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S324

Taillamp extension harness, approx. 10 cm (4 in) from G404 breakout, toward engine harness

Harness Routing Views in Wiring Systems

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S400 (w/Auxiliary A/C)

Auxiliary A/C harness, approx. 7 cm (2.5 in) from blower motor Relays, toward blower motor

Harness Routing Views in Wiring Systems

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S401 (w/Auxiliary A/C)

Auxiliary A/C harness, approx. 40 cm (15 in) from blower motor relays, toward blower motor

Harness Routing Views in Wiring Systems

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S401 (w/Auxiliary HVAC)

Auxiliary HVAC harness, approx. 13 cm (5 in) from blower motor relays breakout, toward blower motor

Harness Routing Views in Wiring Systems

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S402 (w/Auxiliary A/C)

Auxiliary A/C harness, approx. 7 cm (2.5 in) from the blower motor resister breakout, toward the blower motor relays

Harness Routing Views in Wiring Systems

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S403 (w/Auxiliary HVAC)

Auxiliary HVAC harness, approx. 7 cm (2.5 in) from blower motor resistor breakout, toward blower motor

Harness Routing Views in Wiring Systems

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S410 (2-door Utility)

Front-to-rear body harness, approx. 37 cm (14.5 in) from RR door jamb switch breakout, toward RH door speaker breakout

Harness Routing Views in Wiring Systems

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S410 (4-Door (Utility)

Front-to-rear body harness, approx. 12 cm (4.5 in) from RR door speaker breakout, toward RR door jamb breakout

Harness Routing Views in Wiring Systems

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S440 (4-Door Utility w/o C69)

Front-to-rear body harness, approx. 7 cm (2.5 in) from crossbody harness breakout, toward front dome lamp breakout

Harness Routing Views in Wiring Systems

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S441 (4-Door Utility)

Front-to-rear body harness, approx. 5 cm (2 in) from the convenience center harness breakout

Harness Routing Views in Wiring Systems

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S442 (4-Door Utility)

Front-to-rear body harness, approx. 17 cm (6.5 in) from the convenience center harness breakout

Harness Routing Views in Wiring Systems

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