GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

Part of the A/C compressor

HVAC Component Views in HVAC Systems with A/C - Manual

HVAC Connector End Views in HVAC Systems with A/C - Manual

A/C Compressor Clutch Diode (4.3L Engine)

In the engine harness breakout, 8 cm from the breakout to the A/C compressor high pressure switch

HVAC Component Views in HVAC Systems with A/C - Manual

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A/C Compressor Clutch Relay

In the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

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A/C Compressor Cycling Switch (4.3L Engine)

At the A/C accumulator

HVAC Component Views in HVAC Systems with A/C - Manual

HVAC Connector End Views in HVAC Systems with A/C - Manual

A/C Compressor High Pressure Cutoff Switch (4.3L Engine)

Rear of the A/C compressor

HVAC Component Views in HVAC Systems with A/C - Manual

HVAC Connector End Views in HVAC Systems with A/C - Manual

Air Temperature Valve Sensor and Motor

RH top of the heater

HVAC Component Views

HVAC Connector End Views

Blower Motor (w/ Auto A/C)

RH Rear of the engine compartment

HVAC Component Views

HVAC Connector End Views

Body Relay Block

LH of the dash, right of the IP Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Data Link Connector (DLC)

Lower LH of the IP

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Electronic Climate Control (ECC) Module (w/ Auto A/C)

The IP harness center of the IP, below the radio

HVAC Component Views

HVAC Connector End Views

HVAC Solenoid Assembly (w/ Auto A/C)

On the lower rear of the heater assembly, near the Body Control Module

HVAC Component Views

HVAC Connector End Views

Inside Air Temperature Sensor (w/ Auto A/C)

In the roof area over the driver's side door

HVAC Component Views

HVAC Connector End Views

IP Fuse Block

LH of the IP, near the door jamb switch, LF

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Lower Discharge Air Temperature Sensor (Utility w/Auto A/C)

LH side of Floor Air Outlet assembly, under the dash near the BCM

HVAC Component Views

HVAC Connector End Views

Outside Air Temperature Sensor

Mounted to the right radiator support bracket

HVAC Component Views

HVAC Connector End Views

Sun Load Temperature Sensor (Utility w/ Auto A/C)

Top front center of the IP

HVAC Component Views

HVAC Connector End Views

Underhood Fuse Block

On the top of the left inner wheelwell

Power and Grounding Component Views in Wiring Systems

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Underhood Fuse Block Connector C1 (68 Cavities) (Body)

Below the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Underhood Fuse Block Connector C2 (68 Cavities) (Engine)

Below the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Upper Discharge Air Temperature Sensor (w/ Auto A/C)

Top front center of the IP, behind radio in duct work

HVAC Component Views

HVAC Connector End Views

Vehicle Control Module (VCM) (4.3L Engine)

RH of the engine compartment

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Vehicle Control Module (VCM) (4.3L Engine) Connector C3 Clear (32 Cavities)

RH of the engine compartment

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VCM Connector End Views in Engine Controls - 4.3L

Vehicle Control Module (VCM) (4.3L Engine) Connector C4 (24 Cavities)

RH of the engine compartment

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VCM Connector End Views in Engine Controls - 4.3L

C101 (10 Cavities) (4.3L Engine)

Engine harness to body harness, RH of the engine compartment, near the VCM

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C106 (4 Cavities)

Forward lamps to body harness, inside the LF fender near the Underhood Fuse Block

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C203 (116 Cavities)

Body harness to IP harness, to the RH of the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Pickup)

Body harness to dome harness, at the LF of the IP, at the LF window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Utility)

Body harness to dome harness, at the LF of the IP, at the LF window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G102 (4.3L Engine)

Engine harness, RH rear of the cylinder head

Harness Routing Views in Wiring Systems

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G103 (4.3L Engine)

(CKT 351) Engine harness, RH Rear of the cylinder head

Harness Routing Views in Wiring Systems

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G105 (4.3L Engine)

(CKT 450, CKT 451) Engine harness, LH Rear of the cylinder head

Harness Routing Views in Wiring Systems

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G117

(CKT 850) Body harness, to the LH rear of the engine compartment, near the cruise control module

Harness Routing Views in Wiring Systems

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G202

(CKT 1850) Body harness, to the LF of the IP, above P100

Harness Routing Views in Wiring Systems

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G203

(CKT 1050) Body harness, to the RH of the IP, between C203 and the splice packs

Harness Routing Views in Wiring Systems

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G204

(CKT 1050) Body harness, to the RH of the IP, between C203 and the splice packs

Harness Routing Views in Wiring Systems

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P100

IP bulkhead pass-through, LH rear of the engine compartment, on the cowl

Harness Routing Views in Wiring Systems

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S103 (4.3L Engine w/ A/C)

(CKT 350) Engine harness, on the anode side of the A/C compressor clutch diode, in the breakout to the A/C compressor and cutoff switch

Harness Routing Views in Wiring Systems

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S104 (4.3L Engine w/ A/C)

(CKT 59) Engine harness, on the cathode side of the A/C compressor clutch diode, in the breakout to the A/C compressor and cutoff switch

Harness Routing Views in Wiring Systems

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S106 (4.3L Engine)

(CKT 351) Engine harness, between the breakouts to the rear heated oxygen sensors connector and the body harness connector, 7 cm from the breakout to the heated oxygen sensor connector

Harness Routing Views in Wiring Systems

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S118 (4.3L Engine)

(CKT 850) Body harness, between the breakouts to the blower motor and the blower motor relay

Harness Routing Views in Wiring Systems

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S152 (4.3L Engine)

(CKT 351, CKT 413, CKT 451) Engine harness, between the breakouts for the LH rear and RH rear engine block grounds, 15 cm from the breakout to the LH rear engine grounds

Harness Routing Views in Wiring Systems

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S240 (Utility w/ Auto A/C)

(CKT 340) IP harness, 4 cm from the breakout to the BCM module connector C3 and the breakout to the instrument cluster

Harness Routing Views in Wiring Systems

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S288

(CKT 552) IP harness, between the breakout to the ground splice and the breakout to the RH courtesy lamp

Harness Routing Views in Wiring Systems

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S302 (Pickup)

(CKT 1850) Dome harness between the breakout to the dome lamp and to the LH sunshade mirror lamp, 10  from the breakout to the dome lamp

Harness Routing Views in Wiring Systems

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S302 (Utility w/ Sunroof)

(CKT 1850) Dome harness between the breakouts to the inside air temperature sensor and the LH sunshade mirror lamp, 5 cm from the breakout to the sensor

Harness Routing Views in Wiring Systems

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S302 (Utility w/o Sunroof)

(CKT 1850) Dome harness between the breakouts to the inside air temperature sensor and the LH sunshade mirror lamp, 5 cm from the breakout to the sensor

Harness Routing Views in Wiring Systems

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Splice Pack SP200

(CKT 41, CKT 241, CKT 341, CKT 817) Strapped to the body harness, in the center front of the IP, to the RH of SP204

Harness Routing Views in Wiring Systems

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Splice Pack SP201

Body harness, to the LH of the IP, below the IP fuse block, taped to the Body Harness

Harness Routing Views in Wiring Systems

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Splice Pack SP203

(CKT 1050) IP harness, on the IP, in front of the ashtray, strapped to the Body Harness

Harness Routing Views in Wiring Systems

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