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

HVAC Connector End Views in HVAC

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

HVAC Connector End Views in HVAC

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

HVAC Connector End Views in HVAC

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

HVAC Connector End Views in HVAC

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

HVAC Connector End Views in HVAC

Air Injection Reaction (A.I.R.) Pump (5.7L)

LF of Engine Compartment

Engine Controls Component Views

Engine Controls Connector End Views

Air Injection Reaction (A.I.R.) Pump Relay

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

Engine Controls Component Views

Engine Controls Connector End Views

Auxiliary Cooling Fan Relay

LH of 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 top of Clutch Pedal

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Crankshaft Position (CKP) Sensor

Lower RF of Engine Block, near Crankshaft

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module (CCM)

LR of Engine Compartment, on Bulkhead

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

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

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Distributor

Located center rear of engine

Engine Controls Component Views

Engine Controls Connector End Views

Electronic Brake Control Module (EBCM)

Near Brake Master Cylinder, at 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 Engine, near 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 Engine

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions Canister Vent

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

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

Top of Engine

Engine Controls Component Views

Engine Controls Connector End Views

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

In Intake Manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump and Sender

In Fuel Tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Balance Relay

On Fuel Pump Balance Module, inside LH Frame Rail, near Transmission Crossmember

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

Fuel Tank Pressure Sensor

In 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 left exhaust pipe, after the catalytic converter.

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 (5.0L)

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 right exhaust pipe, before 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

HVAC Connector End Views in HVAC

Idle Air Control (IAC) Valve Motor

Attached to LR of Throttle Body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil

RR of Engine

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

RR of 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 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 (5.0L, 5.7L)

RF of Engine Block, below Exhaust Manifold, forward of Starter

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor (Gas)

Top RH center of Intake Manifold, near Fuel Injectors

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

At Air Intake Duct, near Air Filter, RH of 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 cassette 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

HVAC Connector End Views in HVAC

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 side of Throttle Body

Engine Controls Component Views

Engine Controls Connector End Views

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

Under IP, near the convenience center

Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views in Transfer Case

Transfer Case Relay

RR of Engine Compartment, near center of Bulkhead

Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views in Transfer Case

Transfer Case Select Switch

Center of IP, RH of 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 EBCM

Engine Controls Component Views

VCM Connector End Views

Vehicle Speed Sensor (w/RWD)

LR of Transmission

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (w/Selectable 4WD)

LR of 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

C017 (CNG)

LH rear of engine compartment, under the master brake cylinder

Engine Controls Component Views

Engine Controls Connector End Views

C018 (CNG)

LH rear of engine compartment, under the master brake cylinder

Engine Controls Component Views

Engine Controls Connector End Views

C019 (CNG)

LH rear of engine compartment, under the master brake cylinder

Engine Controls Component Views

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 left front 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 (5.0L, 5.7L)

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

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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 (5.0L/5.7L)

Backside of 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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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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P101

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

Harness Routing Views in Wiring Systems

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S012 (CNG)

Engine harness, approx. 6.5 cm (2.6 in) from the starter solenoid breakout, toward the ignition coil breakout

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S013 (CNG)

Engine harness, approx. 13 cm (5.1 in) from the starter solenoid breakout, toward the ignition coil breakout

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S014 (CNG)

Engine harness, approx. 6.5 cm (2.6 in) from the underhood lamp connector breakout, toward engine

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S015 (CNG)

Engine harness, approx. 13 cm (5.1 in) from the underhood lamp connector breakout toward engine

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S016 (CNG)

Engine harness, approx. 6.5 cm (2.6 in) from the crank position sensor breakout, toward the crank position sensor

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S017 (CNG)

Engine harness, approx. 13 cm (5.1 in) from the crank position sensor breakout, toward the crank position sensor

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S018 (CNG)

Engine harness, approx. 14 cm (5.5 in) into the thermostat ground stud breakout

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S019 (CNG)

Engine harness, approx. 20 cm (7.9 in) into the thermostat ground stud breakout

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S020 (CNG)

Engine harness, approx. 4 cm (1.6 in) from the underhood fuse block breakout, toward the engine

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S021 (CNG)

Engine harness, approx. 19.5 cm (7.7 in) from the underhood fuse block breakout, toward the VCM

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S022

Engine harness, approx. 13 cm (5.1 in) from the underhood fuse block breakout, toward the VCM

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S100 (5.0L, 5.7L)

Engine harness, approximately 17 cm (7 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 (5.0L, 5.7L)

Engine harness, approximately 8 cm (3 in) from the EGR valve breakout, toward the taillamp harness breakout

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S104 (5.0L - A/T, 5.7L - M/T)

Engine Harness, approximately 12 cm (4.7 in) into the fuel Injector breakout

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S106 (5.0L, 5.7L)

Engine harness, approx. 17 cm (6.5 in) from the EGR valve breakout, toward the fuel injector breakout

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S107 (5.0L, 5.7L)

Engine harness, approximately 20 cm (8 in) from the EGR valve breakout, toward the taillamp harness breakout

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S108 (Gas)

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

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S111 (5.0L, 5.7L)

Engine harness, approximately 10 cm (4 in) from the EBCM breakout, toward the taillamp harness breakout

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S147 (Gas)

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

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S148 (w/o Leaded Fuel)

Approximately 19 cm (7.5 in) into the oxygen sensor harness

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S149 (w/o Leaded Fuel)

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

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S150

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

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S151

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

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S152 (Gas)

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

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S153

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

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S161

Engine harness, approximately 8 cm (3 in) from the EGR valve breakout, toward the fuel injector harness breakout

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S162 (5.0L, 5.7L )

Engine harness, approximately 17 cm (6.5 in) from the starter solenoid breakout, toward the LH oxygen sensor breakout

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S166 (Gas)

Engine Harness, approximately 18 cm (7 in) from the EBCM breakout

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S204

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

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S212

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

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S213

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

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S215

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

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S221

IP harness, approximately 40 cm (15.5 in) from the 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 (5.0L, 5.7L)

Engine harness, approximately 16 cm (6 in) from the EGR valve breakout, toward the taillamp harness

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S232 (5.0L - HD, 5.7L - HD)

Engine harness, approximately 10 cm (4 in) from the EGR valve breakout

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S232 (5.0L - LD, 5.7L - LD)

Engine harness, approximately 27 cm (10.5 in) from 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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S319 (Gas)

Taillamp extension harness, approximately 7 cm (2.5 in) from the fuel pump and sender breakout, toward the balance fuel pump balance module breakout

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S430

Taillamp extension harness, approximately 6 cm (2.5 in) from the fuel pump harness breakout, toward C409

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