GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Automatic Recirculating Switch

In the air conditioning (A/C) muffler hose assembly, close to the condenser.

HVAC Component Views in HVAC with A/C - Manual

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

A/C Compressor High Pressure Cutout Switch

In the rear of the A/C compressor

HVAC Component Views in HVAC with A/C - Manual

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

A/C Compressor Low Pressure Cycling Switch

On the right side of the A/C accumulator

HVAC Component Views in HVAC with A/C - Manual

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

Automatic Transfer Case (ATC) Control Module

To the left of the instrument cluster behind the headlamp switch

Transfer Case Control Component Views in Automatic Transfer Case

Transfer Case Control Connector End Views in Automatic Transfer Case

Automatic Transmission

Under the vehicle attached to the rear of the engine

Transmission Component Location in Automatic Transmission - 4L60E

Automatic Transmission Electronic Component Views in Automatic Transmission - 4L80E

Automatic Transmission Inline Harness Connector End View in Automatic Transmission - 4L60E

Automatic Transmission Inline Harness Connector End View in Automatic Transmission - 4L80E

Body Control Module (BCM)

On the lower left side of the IP below the steering column

Body Control System Component Views in Body Control System

Body Control System Connector End Views in Body Control System

Camshaft Position (CMP) Sensor

In the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Clutch Pedal Position (CPP) Switch

On the top of the clutch pedal assembly near the reservoir

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Crankshaft Position (CKP) Sensor

On the right lower side of the front engine cover

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

On the left front of the dash in the engine compartment

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

On the left lower dash below the steering column

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Distributor

On the top rear center of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Electronic Brake Control Module (EBCM)

On the left side of the inner frame

Antilock Brake System Component Views in Antilock Brake System

Antilock Brake System Connector End Views in Antilock Brake System

Engine Coolant Level Switch

In the coolant reservoir

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

Engine Coolant Temperature (ECT) Sensor

On the left rear side of the cylinder head

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Level Switch

In the right side of the oil pan

Engine Controls Component Views

Engine Controls Connector End Views

Engine Wiring Harness Junction Block

At the left side of the engine compartment near the battery

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Evaporative Emission (EVAP) Canister Purge Valve

On the top right rear of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emission (EVAP) Canister Vent Valve

At the front right side of the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

On the top right front of the engine assembly

Engine Controls Component Views

Engine Controls Connector End Views

Front Axle Actuator/Switch

On the axle housing on the right side of the center

Transfer Case Control Component Views in Automatic Transfer Case

Transfer Case Control Connector End Views in Automatic Transfer Case

Fuel Injector #1

On the left side of the intake

--

Engine Controls Connector End Views

Fuel Injector #2

On the right side of the intake

--

Engine Controls Connector End Views

Fuel Injector #3

On the left side of the intake

--

Engine Controls Connector End Views

Fuel Injector #4

On the right side of the intake

--

Engine Controls Connector End Views

Fuel Injector #5

On the left side of the intake

--

Engine Controls Connector End Views

Fuel Injector #6

On the right side of the intake

--

Engine Controls Connector End Views

Fuel Pump/Level Sensor

In the fuel tank

--

Engine Controls Connector End Views

Fuel Tank Pressure Sensor

In the fuel tank

--

Engine Controls Connector End Views

Fuse Block

On the lower left side of the IP

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Generator

On the right front of the engine

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

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

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

Under the radio in the center of the IP

HVAC Component Views in HVAC with A/C - Manual

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

Idle Air Control (IAC) Valve

In the throttle body housing

Engine Controls Component Views

--

Ignition Coil

On the right side top of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module (IC)

Near the ignition coil at the top right side of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

On the left side of the IP above the steering column

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

Intake Air Temperature (IAT) Sensor (Part of Mass Air Flow (MAF) Sensor

Part of the mass airflow sensor in the air induction tube

Engine Controls Component Views

Engine Controls Connector End Views

Knock Sensor (KS)

On the top of the block near the left rear

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor

At the back of the throttle body on the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

In the air induction tube near the air cleaner assembly

Engine Controls Component Views

Engine Controls Connector End Views

Park/Neutral Position Switch

On the left side of the transmission

Engine Controls Component Views

Engine Controls Connector End Views

Recirculation Door Motor (HVAC)

In the top center of the HVAC module assembly

HVAC Component Views in HVAC with A/C - Manual

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

Secondary Air Injection Reaction (AIR) Pump

At the right rear of the engine compartment near the front of the dash

Engine Controls Component Views

--

Secondary Air Injection Reaction (AIR) Pump Relay

In the Engine Wiring Harness Junction Block

Electrical Center Identification Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Secondary Air Injection Reaction (AIR) Solenoid

At the right rear of the engine compartment

Engine Controls Component Views

--

Stoplamp Switch

At 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 throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Tow/Haul Switch

In the end of the automatic transmission shift lever

--

Automatic Transmission Inline Harness Connector End View in Automatic Transmission - 4L60E

Automatic Transmission Inline Harness Connector End View in Automatic Transmission - 4L80E

Transfer Case Switch

On the left front of the transfer case

Transfer Case Control Component Views in Manual Transfer Case

Transfer Case Control Connector End Views in Manual Transfer Case

Underhood Lamp Assembly

On the underside of the hood

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Vehicle Control Module (VCM)

On the left front of the engine compartment

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) Adapter (4WD Only)

On the left side of the transmission

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS)

In the extension housing on the left side of the transmission

Engine Controls Component Views

Engine Controls Connector End Views

C100

Under the Engine Wiring Harness Junction Block

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C152

On the left inner fender under the Engine Wiring Harness Junction Block

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C153

On the left inner fender near the Engine Wiring Harness Junction Block

--

Inline Harness Connector End Views in Wiring Systems

C201B

On the steering column under the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202

On the left side of the IP on the back of the cluster

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G100

On the left radiator support bracket

Power and Grounding Component Views in Wiring Systems

--

G102

On the right front of the engine block

--

--

G103

On the right rear of the engine block

Power and Grounding Component Views in Wiring Systems

--

G104

On the left rear of the engine block

Power and Grounding Component Views in Wiring Systems

--

G105

On the right front of the engine block

Power and Grounding Component Views in Wiring Systems

--

G106

On the right front of the engine block

--

--

G203

On the left upper IP at the A pillar

Power and Grounding Component Views in Wiring Systems

--

G403

On the left frame rail near the body mount

--

--

P100

At the left rear of the engine compartment in the front of the dash

Power and Grounding Component Views in Wiring Systems

--

Splice Pack 203 (SP203)

On the top left side of the IP near the A pillar

Harness Routing Views in Wiring Systems

--

Splice Pack 205 (SP205)

On the left side of the IP behind the headlamp switch

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

S101

In the forward lamp harness

--

--

S102

In the engine harness

--

--

S103

In the engine harness

--

--

S104

In the engine harness

--

--

S105

In the engine harness

--

--

S106

In the engine harness

--

--

S107

In the engine harness

--

--

S108

In the engine harness

--

--

S113

In the engine harness (Canada Only)

--

--

S114

In the engine harness (Canada Only)

--

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