GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

ABS/TCC Switch

Under the left hand of the instrument panel, near the brake pedal

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

A/C Compressor Clutch

Right hand lower front of the engine, on the A/C compressor

Engine Controls Component Views

Engine Controls Connector End Views

A/C Compressor Clutch Diode

Right hand front of the engine, near the A/C compressor in the harness

Engine Controls Component Views

Engine Controls Connector End Views

A/C High Pressure Switch

Right hand front of the engine compartment, on the A/C compressor hose assembly

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

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

A/C High Temperature Sensor

Right hand front of the engine compartment, near the A/C accumulator

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

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

A/C Low Pressure Switch

Center rear of the vehicle, on the A/C evaporative tube

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

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

A/C Low Temperature Sensor

Right hand front of the engine compartment, near the bottom A/C accumulator

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

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

Body Control Module (MALL)

Under the right hand of the instrument panel, near the rear of the instrument panel compartment

Body Control System Component Views in Body Control System

Body Control System Connector End Views in Body Control System

Camshaft Position (CMP) Sensor

Right hand rear of the engine, near the power steering pump

Engine Controls Component Views

Engine Controls Connector End Views

Coolant Level Switch

Left hand of the engine compartment, in the bottom of the coolant reservoir tank

--

--

Cooling Fan Relay 1 (Low Speed)

Center rear of the engine compartment, left of the windshield wiper motor

--

Cooling System Connector End Views

Crankshaft Position (CKP) Sensor A

Center front of the engine, near the base of the engine oil level indicator

Engine Controls Component Views

Engine Controls Connector End Views

Crankshaft Position (CKP) Sensor B

Center front of the engine, near the base of the engine oil level indicator

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module

Center rear of the engine compartment, left of the windshield wiper motor

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Under the left hand of the instrument panel, left of the steering column

Engine Controls Component Views in Data Link Communications

Engine Controls Connector End Views

Electronic Brake and Traction Control (EBCM/EBTCM) Module

Left hand rear of the engine compartment, attached to the left hand strut tower

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

Engine Compartment Junction Block

Right hand front of the engine compartment, near the A/C accumulator

Power and Grounding Component Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Engine Coolant Temperature (ECT) Sensor

Left hand rear of the engine, below the exhaust gas recirculation (EGR) valve

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Level Switch

Center front of the engine, in the engine oil pan

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Canister Vent Solenoid

Below the rear of the vehicle, inside the Evaporative Emissions (EVAP) canister

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions (EVAP) Purge Solenoid

Left hand rear of the engine, on the cam cover

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

Left hand rear of the engine, near the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Front Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1)

Center rear of the engine, in the right hand exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injectors

Top of the engine, at respective intake port

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Unit

Under the center rear of the vehicle, in the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure Sensor

Under the center rear of the vehicle, in the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Sender

Under the center rear of the vehicle, in the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Generator

Right hand of the engine, near the power steering pump

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Heater and A/C Programmer

Under the instrument panel, near the rear of the instrument panel compartment

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

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

Idle Air Control (IAC) Valve

Left hand side of the engine, in the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

Right hand rear of the engine, on the rear cam cover under the ignition coils

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

Left hand of the instrument panel, 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

Left hand front of the engine, in the air intake duct

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

Left hand front of the passenger compartment, attached to the door hinge pillar

Power and Grounding Component Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Knock Sensor

Lower front of the engine, left of the starter motor

Engine Controls Component Views

Engine Controls Connector End Views

LH Cooling Fan Diode

in the body harness, between splices S141 and S143 near the RH cooling fan motor

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

LH Cooling Fan Motor

Center front of the engine compartment, behind the radiator

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

LH Rear Junction Block

Left hand rear of the passenger compartment, under the rear seat cushion

Power and Grounding Component Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Manifold Absolute Pressure (MAP) Sensor

Left hand rear of the engine, near the exhaust gas recirculation valve

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

Left hand center of the engine, on the throttle body assembly

Engine Controls Component Views

Engine Controls Connector End Views

Park/Neutral Position (PNP) Switch

Left hand center of the engine compartment, on the transaxle

Engine Controls Component Views

Engine Controls Connector End Views

PASS-Key ® II Theft Deterrent Module

Under the right hand of the instrument panel, near the rear of the instrument panel compartment

--

--

Post-Converter Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 3)

Under the center of the vehicle, near the rear of the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Power Steering Pressure (PSP) Switch

Center rear of the engine compartment, on the high pressure power steering line

--

Engine Controls Connector End Views

Powertrain Control Module (PCM)

Under the right hand side of the instrument panel, near the rear of the instrument panel compartment

Engine Controls Component Views

Powertrain Control Module Connector End Views

Pre-Converter Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2)

Under the center of the vehicle, near the front flange of the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Rear Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1)

Center rear of the engine compartment, on the rear exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

RH Cooling Fan Motor

Center front of the engine compartment, behind the radiator

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

RH Rear Junction Block

Right hand rear of the passenger compartment, under the rear seat cushion

Power and Grounding Component Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

Shift Select Switch

Center front of the passenger compartment, on the shifter handle

Engine Controls Component Views

--

Theft Deterrent Module

Under the right side of the IP, near the rear of the IP compartment

Theft Deterrent System Component Views in Theft Deterrent

Theft Deterrent System Connector End Views in Theft Deterrent

Throttle Position (TP) Sensor

Center left hand of the engine, on the front of the throttle body assembly

Engine Controls Component Views

Engine Controls Connector End Views

Variable Steer Module

Under the right hand of the instrument panel, on the left hand of the HVAC case

--

--

Vehicle Speed Sensor (VSS)

Right hand rear of the transaxle, near the left hand axle shaft

Engine Controls Component Views

Engine Controls Connector End Views

C100 (20 cavities)

Body harness to the transmission harness, left hand front of the engine

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C101 (78 cavities)

Body harness to the engine harness, center rear of the engine compartment

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C102 (30 cavities)

Body harness to the body harness, center rear of the engine compartment

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C106 (20 cavities)

Engine harness to the fuel rail harness, right hand front of the engine

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C114 (7 cavities)

Body harness to the park/neutral switch harness, left hand center of the engine compartment

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C131 (2 cavities)

Engine harness to the starter harness, left hand front of the engine compartment

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C200 (116 cavities)

Body harness to the instrument panel harness, under the left hand of the instrument panel

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C203 (16 cavities)

Instrument panel harness to the console harness, under the center console

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

C420 (7 cavities)

Under center rear of the vehicle

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views

G101

Left hand side of the engine compartment, on the engine beneath the EGR valve

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

G103

Right hand of the engine compartment, on the lower rail near the upper engine mount

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

G201

Right hand front of the passenger compartment, under the kick panel trim plate

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

G202

Left hand front of the passenger compartment, under the kick panel trim plate

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

G302

Left hand rear of the passenger compartment, under the rear seat cushion

Harness Routing Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

P100

Left hand rear of the engine compartment, near the base of the strut tower

Harness Routing Views in Wiring Systems

--

P107

Right hand rear of the engine compartment, near the base of the strut tower

Harness Routing Views in Wiring Systems

--

P402

Under the right hand rear of the vehicle

Harness Routing Views in Wiring Systems

--

P408

Left hand rear of the passenger compartment, under the rear seat

Harness Routing Views in Wiring Systems

--

S104

In the body harness, approx 69.5 cm (27.4 inches) from the engine coolant level switch

Harness Routing Views in Wiring Systems

--

S105

In the engine harness, approx 18.5 cm (7.1 inches) from A/C compressor clutch

Harness Routing Views in Wiring Systems

--

S106

In the engine harness, approx 38 cm (14.9 inches) from the C101 connector

Harness Routing Views in Wiring Systems

--

S108

In the engine harness, approx 23.5 cm (9.3 inches) from A/C compressor clutch

Harness Routing Views in Wiring Systems

--

S114

In the engine harness, approx 26.5 cm (10.4 inches) from the C106 connector

Harness Routing Views in Wiring Systems

--

S115

In the body harness, approx 32 cm (12.6 inches) from the C105 connector

Harness Routing Views in Wiring Systems

--

S118

In the engine harness, approx 18.5 cm (7.3 inches) from the C101 connector

Harness Routing Views in Wiring Systems

--

S121

In the body harness, approx 35 cm (13.8 inches) from the G103 ground

Harness Routing Views in Wiring Systems

--

S123

In the engine harness, approx 15 cm (5.9 inches) from the engine oil pressure switch

Harness Routing Views in Wiring Systems

--

S127

In the engine harness, approx 17.5 cm (6.9 inches) from the C106 connector

Harness Routing Views in Wiring Systems

--

S130

In the body harness, approx 38 cm (14.9 inches) from the P107 pass-through

Harness Routing Views in Wiring Systems

--

S141

In the body harness, approx 34 cm (13.4 inches) from the RH engine cooling fan motor

Harness Routing Views in Wiring Systems

--

S143

In the body harness, approx 30.5 cm (12.0 inches) from the RH engine cooling fan motor

Harness Routing Views in Wiring Systems

--

S150

In the fuel injector harness, approx 26.5 cm (10.4 inches) from the C106 connector

Harness Routing Views in Wiring Sy stems

--

S151

In the fuel injector harness, approx 20 cm (7.9 inches) from the C106 connector

Harness Routing Views in Wiring Systems

--

S152

In the engine harness, approx 31.5 cm (12.2 inches) from the C101 connector

Harness Routing Views in Wiring Systems

--

S153

In the engine harness, approx 33 cm (13.0 inches) from the C106 connector

Harness Routing Views in Wiring Systems

--

S204

In the IP harness, approx 23.5 cm (9.3 inches) from the C200 connector

Harness Routing Views in Wiring Systems

--

S209

In the body harness, approx 37.5 cm (14.8 inches) from the turn signal flasher

Harness Routing Views in Wiring Systems

--

S211

In the body harness, approx 35.5 cm (14.0 inches) from the turn signal flasher

Harness Routing Views in Wiring Systems

--

S214

In the body harness, approx 49 cm (19.3 inches) from the turn signal flasher

Harness Routing Views in Wiring Systems

--

S225

In the body harness, approx 24.5 cm (9.6 inches) from the G201 ground

Harness Routing Views in Wiring Systems

--

S241

In the body harness, approx 82.5 cm (32.5 inches) from the powertrain control module (PCM)

Harness Routing Views in Wiring Systems

--

S245

In the body harness, approx 38 cm (15.0 inches) from the powertrain control module (PCM)

Harness Routing Views in Wiring Systems

--

S248

In the body harness, approx 43.5 cm (17.1 inches) from the powertrain control module (PCM)

Harness Routing Views in Wiring Systems

--

S258

In the body harness, approx 32 cm (12.6 inches) from the park brake switch

Harness Routing Views in Wiring Systems

--

S259

In the body harness, approx 160.5 cm (63.2 inches) from the powertrain control module (PCM)

Harness Routing Views in Wiring Systems

--

S290

In the body harness, approx 73 cm (28.7 inches) from the P100 pass-through

Harness Routing Views in Wiring Systems

--

S294

In the body harness, approx 29.5 cm (11.6 inches) from the G202 ground

Harness Routing Views in Wiring Systems

--

S295

In the body harness, approx 87 cm 34.3 inches) from the powertrain control module (PCM)

Harness Routing Views in Wiring Systems

--

S297

In the body harness, approx 76 cm (29.9 inches) from the powertrain control module (PCM)

Harness Routing Views in Wiring Systems

--

S298

In the body harness, approx 82.5 cm (32.5 inches) from the P100 pass-through

Harness Routing Views in Wiring Systems

--

S316

In the console harness, approx 22 cm (8.7 inches) from the C300 connector

Harness Routing Views in Wiring Systems

--

S344

In the body harness, approx 26 cm (10.2 inches) from the G302 ground

Harness Routing Views in Wiring Systems

--

S427

In the body harness, approx 95.5 cm (37.6 inches) from the C410 connector

Harness Routing Views in Wiring Systems

--

S451

In the body harness, approx 150 cm (59.1 inches) from the C303 connector

Harness Routing Views in Wiring Systems

--