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 in HVAC Systems with A/C - Manual

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

A/C Compressor Clutch Relay

In the underhood fuse-relay center, in the left rear side of the engine compartment, on the fender

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

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

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 in HVAC Systems with A/C - Manual

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

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 in HVAC Systems with A/C - Manual

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

A/C Compressor Low Pressure Cutout Switch

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

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

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

Air Injection Reaction (A.I.R.) Pump Clutch(7.4L)

Lower RF of the Engine

Engine Controls Component Views

Engine Controls Connector End Views

Auxiliary Cooling Fan Relay

LH of the Engine Compartment

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Camshaft Position Sensor

Top rear center of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Clutch Pedal Position Switch

At the top of the Clutch Pedal

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

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

Crankshaft Position (CKP) Sensor

Lower RF of the Engine Block, near the Crankshaft

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module (CCM)

LR of Engine Compartment, on the Bulkhead

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Under the LH of the IP, LH of the Steering Column, mounted to the bottom of the Knee Bolster

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Distributor

Located at the center rear of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Electronic Brake Control Module (EBCM)

Near the Brake Master Cylinder, at the LF Wheelhousing

Antilock Brake System Component Views in ABS/Traction Control

Antilock Brake System Connector End Views in ABS/Traction Control

Electronic Variable Orifice (EVO)/Passlock Module

Under the center of the IP

Theft Deterrent System Component Views in Theft Deterrent

Theft Deterrent System Connector End Views in Theft Deterrent

Engine Coolant Temperature Sensor (Gas)

Top RF of the Engine, near the Thermostat Housing

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Evaporative Emissions Canister Purge Solenoid

At top RH of the Engine

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions Canister Vent

LF of the EBCM, near the Brake Master Cylinder, at the LF Wheelhousing

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions Canister Purge Vacuum Switch

RH top of the Engine, toward the rear

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

Top of the Engine

Engine Controls Component Views

Engine Controls Connector End Views

Front Axle Actuator

RF of the Front Drive Axle

Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views in Transfer Case

Fuel Injectors (5.0L, 5.7L, 7.4L)

In the Intake Manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump and Sender

In the Fuel Tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Prime Connector

In the IP harness, approximately 20 cm from the underhood fuse block breakout

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Relay

In the Underhood Fuse-Relay Center, LR of the Engine Compartment, on the Fender

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure Sensor

In the Fuel Tank

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1

In the left exhaust pipe, before the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2

In the right exhaust pipe, before the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1

In the left exhaust pipe, after the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2

In the right exhaust pipe, after the catalytic converter.

Engine Controls Component Views

Engine Controls Connector End Views

HVAC Control Module

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

HVAC Component Views in HVAC Systems with A/C Manual

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

Idle Air Control (IAC) Valve Motor

Attached to the RR of the Throttle Body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

RR of the Engine

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

On the upper left end of the IP, above the steering column

Instrument Panel, Gages, and Console Component Views in Instrument Panel and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel and Console

Intake Air Temperature (IAT) Sensor (Gas)

In the Air Intake Duct

Engine Controls Component Views

Engine Controls 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

Knock Sensor (7.4L)

LR of the Engine Mount, on the Engine

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor (Gas)

Top RH center of the Intake Manifold, near the Fuel Injectors

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

At the Air Intake Duct, near the Air Filter, RH of the Engine

Engine Controls Component Views

Engine Controls Connector End Views

Radio, Connector C1

In the center of the IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Radio, Connector C2

In the center of the IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Radio, Connector C3

In the center of the IP, jumper from the radio to the cassestte player

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Recirculation Door Motor

Under the IP, on the HVAC plenum

HVAC Component Views in HVAC Systems with A/C Manual

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

Stoplamp Switch

On the top of the brake pedal

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Throttle Position (TP) Sensor

On the side of the Throttle Body

Engine Controls Component Views

Engine Controls Connector End Views

Transfer Case Control Module (TCCM) (Selectable 4WD)

Under the IP, near the convience center

Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views in Transfer Case

Transfer Case Relay

RR of the Engine Compartment, near the center of the Bulkhead

Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views in Transfer Case

Transfer Case Select Switch

Center of the IP, RH of the Steering Column Shift Lever

Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views in Transfer Case

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 the EBCM

Engine Controls Component Views

VCM Connector End Views

Vehicle Speed Sensor (w/RWD)

LR of the Transmission

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (w/Selectable 4WD)

LR of the Transfer Case

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) Adapter (A/T w/4WD)

Male-to-male connector adapter from the engine harness to the 4WD extension harness

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Engine Controls Connector End Views

C100

Part of the engine harness to IP 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

C103

Part of the engine harness to fuel pump motor, in the left rear side of the engine compartment, under the brake master cylinder

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C105 (7.4L)

Part of the engine harness to fuel injectors, at the rear of the intake manifold

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C107

Part of engine harness to oxygen sensors harness, on the LF of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C120

Part of the engine harness to front axle actuator, in the rear of the engine, near the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C121 (M/T w/4WD)

Engine harness to 4WD extension harness

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Inline Harness Connector End Views in Wiring Systems

C122 (M30)

On the right side of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C122 (MT1)

On the left side of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C130

Engine harness, Inline to the Tail and Stop Lamp Extension harness

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200

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

C227 (Stoplamp Switch)

IP harness, Inline to the Stoplamp Switch

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C230

Behind the right side of the IP, above the HVAC evaporator housing

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

D104 (7.4L)

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

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G103 (Gas)

On the RF side of the engine, near the thermostat housing

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 RF side of the engine block

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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G404

Inside the left side frame rail, near the rear crossmember

Power and Grounding Component Views in Wiring Systems

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P100

In the left rear side of the engine compartment, at the bulkhead, above C100

Harness Routing Views in Wiring Systems

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S100 (7.4L)

Engine harness, approximately 23 cm (9 in) from the EBCM breakout, toward the taillamp harness

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S101 (Gas)

Engine harness approximately 12 cm (5.5 in) from the EBCM harness breakout, in the Underhood Fuse Relay Center harness breakout

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S103 (7.4L - A/T)

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

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S103 (7.4L - M/T)

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

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S104 (7.4L)

Engine harness, approximately 30 cm (11.8 in) from EBCM breakout, towards C200

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S106 (7.4L)

Engine harness, approximately 7 cm (2.5 in) from EGR valve breakout, toward fuel injector breakout

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S107 (7.4L)

Engine harness, approximately 18 cm (7 in) from EBCM breakout, toward tthe EGR harness breakout

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S108 (Gas)

Engine harness, approximately 12 cm (4.5 in) from ignition coil breakout, toward starter solenoid

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S111 (7.4L)

Engine harness, approximately 7 cm (2.5 in) from EBCM breakout

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S145 (7.4L)

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

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S146 (7.4L)

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

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S147 (Gas)

engine harness, approximately 5 cm (2 in) from EGR valve breakout, toward taillamp harness breakout

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S148 (w/o Leaded Fuel)

Approx. 19 cm (7.5 in) into oxygen sensor harness

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S149 (w/o Leaded Fuel)

Oxygen sensor harness, approximately 7 cm (2.5 in) from RH bank oxygen sensor breakout, toward LH bank oxygen sensor

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S150

Engine harness, approximately 13 cm (5 in) from EBCM breakout

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S151

Engine Harness, approximately 7 cm (2.5 in) inside EBCM harness breakout

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S152 (Gas)

Engine harness , approximately 6.5 cm (2.5 in) from EBCM breakout

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S153

IP harness, approximately 13 cm (5 in) from CCM, toward P100

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S162 (7.4L)

Engine harness, approximately 15 cm (6 in) from RH bank oxygen sensor breakout, toward starter solenoid breakout

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S204

IP harness, approximately 10 cm (4 in) from C100, towards Data Link Connector (DLC)

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S212

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

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S213

IP harness, approximately 4 cm (1.5 in) from steering column harness breakout, towards the DLC

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S215

IP harness, approximately 8 cm (3 in) from instrument cluster breakout, toward radio connectors breakout

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S221

IP harness, approximately 40 cm (15.5 in) from instrument cluster breakout

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S222

IP harness, approximately 20 cm (8 in) from the inflatable restraint switch breakout

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S231 (7.4L - A/T)

Engine harness, approximately 18 cm (7 in) from the EGR valve breakout

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S231 (7.4L - M/T)

Engine harness, approximately 7 cm (2.5 in) from the EGR valve breakout

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S232 (7.4L)

Engine harness, approximately 4 cm (1.5 in) into the EGR valve breakout

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S268

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

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S272

IP harness, approximately 4 cm (1.5 in) from the auxiliary power outlet breakout

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S280

IP harness, approximately 5 cm (2 in) from the DLC breakout

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S298

IP harness, approximately 24 cm (9.5 in) from the instrument cluster breakout, toward the radio breakout

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S314 (K300)

Selectable 4W harness, approximately 5 cm (2 in) from the transfer case relay breakout, toward the front axle switch

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S318

Taillamp extension harness, approximately 10 cm (4 in) from the fuel pump balance module breakout, toward the engine harness

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