GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

At the front LH 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 High Pressure Cut-Off Switch

At 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

A/C Compressor Refrigerant Pressure Switch

Located by the body builder

--

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

A/C Compressor Relay

In the engine compartment on the bulkhead under the battery junction block

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

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

Camshaft Position Sensor

In the distributor at the top rear of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Crankshaft Position Sensor

At the lower RH front of the engine behind the crankshaft balancer pulley

Engine Controls Component Views

Engine Controls Connector End Views

Data Link Connector (DLC)

LH of the passenger compartment lower bulkhead on the side of the relay bracket

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Distributor

At the top rear of the engine

Engine Controls Component Views

--

Electronic Brake Control Module (EBCM)

Below the radiator on the lower crossmember

Antilock Brake System Component Views in Antilock Brake System

Antilock Brake System Connector End Views in Antilock Brake System

Engine Coolant Temperature (ECT) Sensor

At the top front of the engine near the thermostat housing

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions Canister Purge Valve

At the RH center of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emissions Canister Vent Valve (Cal. Only)

Along the RH frame rail, in front of the fuel tank near the EVAP canister

--

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

At the front LH top of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Module

At the top center of the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Prime Connector

Taped to the fuel pump relay breakout

Engine Controls Component Views

--

Fuel Pump Relay

In the engine compartment on the bulkhead under the battery junction block

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure Sensor (Cal. Only)

At the fuel tank

--

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1

In the LH exhaust pipe ahead of the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1

In the RH exhaust pipe ahead the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2

In the exhaust pipe behind the catalytic converter

Engine Controls Component Views

Engine Controls Connector End Views

Idle Air Control Valve

At the LH center of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil

Mounted on a bracket above the top edge of the RH cylinder head

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module

Mounted on a bracket above the top edge of the RH cylinder head, in front of the ignition coil

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

Body builder installed

--

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

Intake Air Temperature Sensor

At the front RH side, in the engine air induction system elbow near the remote air cleaner

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

Located by the body builder

Electrical Center Identification Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Knock Sensor

At the rear of the engine, top center

Engine Controls Component Views

--

Manifold Absolute Pressure Sensor

Near the center of the intake manifold, behind the air intake

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow Sensor

At the front RH side, in the engine air induction system elbow near the remote air cleaner

Engine Controls Component Views

Engine Controls Connector End Views

Throttle Position Sensor

At the LH center of the intake manifold, near the Idle air control valve

Engine Controls Component Views

Engine Controls Connector End Views

Torque Converter Clutch (TCC) and Stoplamps Switch

Above the brake pedal at the RH side of the steering column

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Transmission Input Speed Sensor

On the LH side of the transmission near the middle

Engine Controls Component Views

Engine Controls Connector End Views

Transmission Output Speed Sensor

On the LH side of the transmission near the middle

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Control Module

At the LH side of the radiator support

Engine Controls Component Views

VCM Connector End Views

C105

Engine harness to the fuel injector harness, at the center of the intake manifold behind the air intake

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C110

Engine harness to the ABS harness, at the front of the LH frame rail near the steering gearbox

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200

Engine harness to the IP harness, in the bulkhead near P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202

Engine harness to the IP harness, in the bulkhead near P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C300

Engine harness to the rear chassis harness, near the middle of the chassis at the outside of the LH frame rail

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C301

Engine harness to the transmission, on the LH side of the transmission near the middle

Automatic Transmission Electronic Component Views in Automatic Transmission - 4L80-E

Automatic Transmission Inline Harness Connector End View in Automatic Transmission - 4L80-E

C401

Rear chassis harness to the fuel pump module harness, near the LH frame rail in back of the fuel tank

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C402

Rear chassis harness to the EVAP canister vent valve solenoid extension harness, along the LH frame rail in front of the upper rear shock mount

--

Inline Harness Connector End Views in Wiring Systems

D101

In the engine harness, approximately 13 cm (5 in) from the breakout toward the A/C compressor high pressure cut-off switch

--

--

G102

At the rear of the LH cylinder head

Power and Grounding Component Views in Wiring Systems

--

G104

At the rear of the LH cylinder head

Power and Grounding Component Views in Wiring Systems

--

G200

LH interior bulkhead near the relay bracket

--

--

G400

LH frame rail in front of the fuel tank

Power and Grounding Component Views in Wiring Systems

--

P100

LH bulkhead left of the steering column

Harness Routing Views in Wiring Systems

--

R100

In the engine harness, approximately 23 cm (10 in) from the breakout to the MAF and IAT sensors

--

--

S108

In the engine harness, approximately 9 cm (4 in) from the engine oil pressure gauge sensor breakout toward the fuel injector harness connector C105

--

--

S110

In the engine harness, approximately 4 cm (2 in) from the breakout for C200 towards P100

--

--

S116

In the engine harness, approximately 7 cm (2 in) from the breakout for C110 and C111 toward C200

--

--

S118

In the engine harness at the LH rear of engine, approximately 4 cm (2 in) from the G102/G104 breakout toward the bank 1 HO2S

--

--

S119

In the engine harness, approximately 11 cm (4 in) from the ECT and the A/C compressor clutch breakout towards C200

--

--

S124

In the engine harness on the end of D101, approximately 13 cm (5 in) from the A/C compressor high pressure cut-off switch connector breakout toward the connector

--

--

S132

In the engine harness, approximately 19 cm (8 in) from the C200 breakout towards the MAF sensor breakout

--

--

S133

In the engine harness, approximately 8 cm (3 in) from the breakout for the VCM toward the VCM

--

--

S134

In the engine harness, approximately 12 cm (5 in) from the breakout for the VCM toward the VCM

--

--

S135

In the engine harness, approximately 23 cm (9 in) from the breakout for the ECT and the A/C compressor clutch toward C200

--

--

S136

In the engine harness, approximately 8 cm (3 in) from the breakout for the throttle position sensor toward C200

--

--

S138

In the engine harness, approximately 7 cm (3 in) from the TPS breakout toward the ignition coil

--

--

S139

In the engine harness breakout for the CMP sensor, approximately 3 cm (1 in) from the main harness

--

--

S140

In the engine harness, approximately 4 cm (2 in) from the breakout for the TOSS connector toward the breakout for C300

--

--

S142

In the engine harness, R100 splice, approximately 23 cm (9 in) from the breakout for the MAF and IAT sensors toward the A/C compressor connectors

--

--

S143

In the engine harness, approximately 6 cm (2 in) from the breakout for C200 toward the MAF sensor

--

--

S144

In the engine harness, approximately 11 cm (4 in) from the breakout for C200 toward P100

--

--

S145

In the engine harness, approximately 7 cm (3 in) from the ignition control module breakout toward the breakout for C105

--

--

S150

In the engine harness, approximately 18 cm (7 in) from the breakout for C200 toward P100

--

--

S200

In the IP side of engine harness, approximately 19 cm (8 in) from P100 toward the ignition switch

--

--

S205

In the IP harness, approximately 4 cm (2 in) from the fuse block breakout toward C200

--

--

S207

In the IP harness, approximately 66 cm (26 in) from the fuse block toward the instrument cluster connector

--

--

S406

In the rear chassis harness, approximately 10 cm (4 in) from G400

--

--