GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor

At the top left of the engine

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 (2.2 L Engine)

In the engine harness, 20 cm (7.87 in) from the A/C compressor clutch connector

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

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A/C Compressor Clutch Diode (4.3 L Engine)

In the engine harness, 34.5 cm (13.5 in) from the A/C compressor clutch connector

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

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A/C Compressor Clutch Relay

In the UBEC

Power and Grounding Component Views in Wiring Systems

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A/C Compressor Cycling Switch (4.3 L 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 Switch (2.2 L Engine)

At the A/C accumulator

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

To the 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

On the right top of the heater

HVAC Component Views

HVAC Connector End Views

Ambient Air Temperature Sensor (w/ Overhead Console and Auto A/C)

At the front center of the vehicle, left of the hood latch support

HVAC Component Views

HVAC Connector End Views

Ambient Air Temperature Sensor (w/ Overhead Console)

At the front center of the vehicle, on the hood latch support

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

Body Bussed Electrical Center (BBEC)

To the left of the dash, to the right of the IP Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

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

At the IP harness center of the IP, below the radio

HVAC Component Views

HVAC Connector End Views

Heater and A/C Controller (w/ Man A/C) Connector C1 (10 Cavities) (Heater Control Lamp)

At the upper center of the IP, at the bottom center connector

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

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

Heater and A/C Controller (w/ Man A/C) Connector C2 (3 Cavities) (Heater Control Lamp)

At the upper center of the IP, next to the vacuum harness connector

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

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

Heater and A/C Controller (w/ Man A/C) Connector C3 (3 Cavities)

At the upper center of the IP, at the top center connector

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

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

Heater and A/C Controller (w/ Man A/C) Connector C4 (5 Cavities)

At the upper center of the IP

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

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

Heater and A/C Controller (w/ Man A/C) Connector C5 (4 Cavities) (Except Base Pickup)

At the upper center of the IP, between connector C1 and connector C3

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

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

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

In the headliner, at the top of the left door

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

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

Pulse Width Modulating Drive Motor (w/ auto A/C)

To the right rear of the engine compartment

HVAC Component Views

HVAC Connector End Views

Underhood Bussed Electrical Center (UBEC)

On the top of the left inner wheelwell

Power and Grounding Component Views in Wiring Systems

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Underhood Bussed Electrical Center (UBEC) Connector C1 (68 Cavities) (4-door Utility Body harness)

In the UBEC

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Underhood Bussed Electrical Center (UBEC) Connector C2 (68 Cavities)

Below the UBEC

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Vehicle Control Module (VCM) (4.3 L Engine)

To the right of the engine compartment

Engine Controls Component Views in Engine Controls 4.3L

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

To the right of the engine compartment

Engine Controls Component Views in Engine Controls 4.3L

Engine Controls Connector End Views in Engine Controls 4.3L

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

To the right of the engine compartment

Engine Controls Component Views in Engine Controls 4.3L

Engine Controls Connector End Views in Engine Controls 4.3L

C101 (10 Cavities) (2.2 L Engine)

At the engine harness to body harness, to the right of the engine compartment, near the VCM

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C106 (4 Cavities)

At the forward lamps to body harness, inside the left front fender near the UBEC

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C203 (116 Cavities)

At the body harness to IP harness, to the right of the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Pickup)

At the body harness to dome harness, at the left front of the IP, at the left front window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Utility)

At the body harness to dome harness, at the left front of the IP, at the left front window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G102 (2.2 L Engine)

At the engine harness, to the right front of the engine block, under the generator

Harness Routing Views in Wiring Systems

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G102 (4.3 L Engine)

At the engine harness, to the right rear of the cylinder head

Harness Routing Views in Wiring Systems

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G103 (2.2 L Engine)

(CKT 351) At the engine harness, to the right front of the engine block, under the generator

Harness Routing Views in Wiring Systems

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G103 (4.3 L Engine)

(CKT 351) At the engine harness, to the right rear of the cylinder head

Harness Routing Views in Wiring Systems

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G105 (2.2 L Engine)

(CKT 450, CKT 451) At the engine harness, to the right rear of the engine block, near the Ignition control module

Harness Routing Views in Wiring Systems

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G105 (4.3 L Engine)

(CKT 450, CKT 451) At the engine harness, to the left rear of the cylinder head

Harness Routing Views in Wiring Systems

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G117

(CKT 850) At the body harness, to the left rear of the engine compartment, near the cruise control module

Harness Routing Views in Wiring Systems

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G202

(CKT 1850) At the body harness, to the left front of the IP, above P100

Harness Routing Views in Wiring Systems

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G203

(CKT 1050) At the body harness, to the right of the IP, between C203 and the splice packs

Harness Routing Views in Wiring Systems

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G204

(CKT 1050) At the body harness, to the right of the IP, between C203 and the splice packs

Harness Routing Views in Wiring Systems

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P100

At the IP bulkhead pass-through, to the left rear of the engine compartment, on the cowl

Harness Routing Views in Wiring Systems

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S103 (2.2 L Engine w/ A/C)

(CKT 350) At the 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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S103 (4.3 L Engine w/ A/C)

(CKT 350) At the 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 (2.2 L Engine w/ A/C)

(CKT 59) At the 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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S104 (4.3 L Engine w/ A/C)

(CKT 59) At the 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 (2.2 L Engine)

(CKT 351) At the engine harness, between the breakouts to the PCM and to the fuel injector connector, 25 cm (9.8 in) from the breakouts to the PCM

Harness Routing Views in Wiring Systems

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S106 (4.3 L Engine)

(CKT 351) At the engine harness, between the breakouts to the rear heated oxygen sensors connector and the body harness connector, 7 cm (2.75 in) from the breakout to the heated oxygen sensor connector

Harness Routing Views in Wiring Systems

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S118

(CKT 850) At the 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 (2.2 L Engine)

(CKT 351, CKT 413, CKT 451) At the engine harness, between the breakouts for the left rear and the right rear engine block grounds, 15 cm (5.9 in) from the breakout to the left rear engine grounds

Harness Routing Views in Wiring Systems

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S266

(CKT 1440) In the left seat harness

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S280 (Utility w/ Auto A/C)

(CKT 552) At the IP harness, lower center, between the breakouts for the AM/FM stereo radio and the right courtesy lamps, 4 cm (1.57 in) from the breakout to the courtesy lamp

Harness Routing Views in Wiring Systems

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S302 (Pickup)

(CKT 1850) At the dome harness between the breakout to the dome lamp and to the left sunshade mirror lamp, 10 cm (3.93 in) from the breakout to the dome lamp

Harness Routing Views in Wiring Systems

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S302 (Utility w/ Sunroof)

(CKT 1850) At the dome harness between the breakouts to the inside air temperature sensor and the left 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) At the dome harness between the breakouts to the inside air temperature sensor and the left sunshade mirror lamp, 5 cm (1.96 in) 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 right of SP204

Harness Routing Views in Wiring Systems

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Splice Pack SP201

At the body harness, to the left of the IP, below the IP fuse block

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

Harness Routing Views in Wiring Systems

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