GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Automatic Transmission (AT) Selector Control

On the left side of the IP, to the right of the steering column, on the center accessory trim plate

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Data Link Connector (DLC) (Gasoline)

Under the left side of the IP

Data Link Communications Component Views

Data Link Communications Connector End Views

Data Link Connector (DLC) (Gasoline)

Under the left side of the IP

Engine Controls Component Views

Engine Controls Connector End Views

Distributor

On the top rear of the engine, in the center (houses the distributor ignition (DI) control module)

Engine Controls Component Views

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Distributor Ignition (DI) Control Module

On the top rear of the engine, in the center, part of the ignition distributor

Engine Controls Component Views

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C1 (4 cavities)

In the engine harness, to the ignition distributor

Engine Controls Component Views

Engine Controls Connector End Views

C2 (2 cavities)

In the engine harness jumper to the ignition coil

Engine Controls Component Views

Engine Controls Connector End Views

Driver Information Center (DIC) (Gasoline)

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views

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C1 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

C2 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Engine Coolant Temperature (ECT) Gauge Sensor (Gasoline)

On the intake manifold water jacket, behind the thermostat housing coolant outlet

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Engine Coolant Temperature (ECT) Sensor (Gasoline)

On the intake manifold water jacket behind the thermostat housing outlet

Engine Controls Component Views

Engine Controls Connector End Views

Engine Oil Pressure (EOP) Gauge

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views

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Engine Oil Pressure (EOP) Gauge Sensor and Fuel Pump (FP) Switch (Gasoline)

On the top rear of the engine near the bell housing

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Engine Oil Pressure (EOP) Gauge Sensor and Fuel Pump (FP) Switch (Gasoline)

On the top rear of the engine near the bell housing

Engine Controls Component Views

Engine Controls Connector End Views

Engine Speed Governor Control Module

On the top of the engine, on the left front of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Engine Speed Governor Motor

On the left side of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump (FP) Relay (Gasoline and Cat® Diesel)

In the MaxiFuse© block/ mini-relay center, position E

Engine Controls Component Views

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Fuel Sender and Fuel Pump (FP) (Gasoline)

On the outboard side of the right frame rail, in the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Sender and Fuel Pump (FP) (Gasoline)

On the outboard side of the right frame rail, in the fuel tank

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Generator (Gasoline)

On the upper right side of the engine

Engine Electrical Component Views

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C1 (ring terminal)

In the engine harness, to the generator Bat terminal

Engine Electrical Component Views

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C2 (4 cavities)

In the engine harness, to the generator

Engine Electrical Component Views

Engine Electrical Connector End Views

HI IDLE Switch

On the left side of the IP, to the right of the steering column, on the left IP accessory trim plate

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

In the center of the IP, to the left of the instrument panel cluster (IPC)

Power and Grounding Component Views

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Idle Air Control (IAC) Valve

On the top of the engine, on the right side of the engine, behind the TPS

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil

Left rear of the intake manifold

Engine Controls Component Views

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C1 (2 cavities)

In the engine harness to the ignition coil

Engine Controls Component Views

Engine Controls Connector End Views

C2 (2 cavities)

In the engine harness jumper to the distributor ignition (DI) control module

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Relay

In the mini-relay center, position A

Power and Grounding Component Views

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Instrument Panel Cluster (IPC)

In the left side of the IP

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Knock Sensor (KS)

On the forward left side of the engine block, below the exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Knock Sensor (KS) Module

On the top of the engine, on the left intake

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor

On the right rear top of the intake

Engine Controls Component Views

Engine Controls Connector End Views

MaxiFuse® Block/ Mini-Relay Center

On the right side of the IP, under the access cover

Power and Grounding Component Views

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MaxiFuse® Block 1

On the right side of the IP, under the access cover, on the left side of the MaxiFuse® block/ mini-relay center

Power and Grounding Component Views

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MaxiFuse® Block 2

On the right side of the IP, under the access cover, on the center of the MaxiFuse® block/ mini-relay center

Power and Grounding Component Views

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Mini-Relay Center

On the right side of the IP, under the access cover, on the right side of the MaxiFuse® block/ mini-relay center

Power and Grounding Component Views

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Neutral Switch (Automatic Transmission)

On the lower right side of the transmission

Engine Electrical Component Views

Engine Electrical Connector End Views

Oxygen Sensor (O2S)

On the left exhaust manifold, to the rear of the left exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Powertrain Control Module (PCM) (Gasoline)

Center of the IP upper

Engine Controls Component Views

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C1 (32 cavities)

In the engine harness, to the PCM

Engine Controls Component Views

Engine Controls Connector End Views

C2 (24 cavities)

In the engine harness, to the PCM

Engine Controls Component Views

Engine Controls Connector End Views

Speedometer

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views

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Tachometer

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views

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Throttle Body Fuel Injector 1

On the top of the engine, inside the throttle body, on the left side

Engine Controls Component Views

Engine Controls Connector End Views

Throttle Body Fuel Injector 2

On the top of the engine, inside the throttle body, on the right side

Engine Controls Component Views

Engine Controls Connector End Views

Throttle Position (TP) Sensor

On the top of the engine, on the right side of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Two-Speed Rear Axle Air Shift Switch (Air-Operated Shift System)

On the left frame rail, forward of the rear axle, on the two-speed rear axle quick-release valve

Rear Axle Component Views

Rear Axle Connector End Views

Two-Speed Rear Axle Shift Actuator (Motor) (Electric-Operated Shift System)

On the front of the differential housing

Rear Axle Component Views

Rear Axle Connector End Views

Two-Speed Rear Axle Shift Relay (Electric-Operated Shift System)

On the front right side of the crossmember, forward of the rear axle

Rear Axle Component Views

Rear Axle Connector End Views

Two-Speed Rear Axle Shift Switch (Electric-Operated Shift System)

At the manual transmission shift lever

Rear Axle Component Views

Rear Axle Connector End Views

Vehicle Speed Buffer Module

Right side of the IP under MaxiFuses®

Instrument Panel, Gages, and Console Component Views

Engine Electrical Connector End Views

Vehicle Speed Sensor (VSS)

On the lower left side of the transmission tailshaft housing

Engine Controls Component Views

Engine Controls Connector End Views

Voltmeter

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views

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C116 (5 cavities) (Gasoline)

In the engine harness, to the fuel tank harness, at the right frame rail, near the starter

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Inline Harness Connector End Views

C117 (3 cavities) (Gasoline and Cat® Diesel)

In the engine harness, to the two-speed rear axle jumper harness, near the frame rail, by the starter

--

Inline Harness Connector End Views

C200 (56 cavities) (Gasoline)

In the IP harness, to the engine harness, under the right side of the IP

--

Inline Harness Connector End Views

C203 (2 cavities) (Distributor Timing Bypass Connector)

Right side of IP below relay/MaxiFuse® center

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Inline Harness Connector End Views

C409 (8 cavities) (Gasoline)

In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing

--

Inline Harness Connector End Views

G102 (Gasoline)

From the engine harness, to the back of the left cylinder head

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G106 (Gasoline)

From the engine harness to the left rear side of the left cylinder head

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P100

On the right side of the bulkhead

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P102

On the right side of the bulkhead

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S126 (Gasoline and Electric-Operated Shift System

In the engine harness, approximately 21 cm (8.3 in) from the engine oil pressure (EOP) gauge sensor and fuel pump switch breakout, toward the bulkhead

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S127

In the engine harness, approximately 4 cm (1.6 in) in the main branch, to the left of the fuel injectors breakout

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S128

In the engine harness, approximately 5 cm (2.0 in) from the manifold absolute pressure (MAP) sensor breakout

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S130

In the engine harness, approximately 12 cm (4.7 in) from the manifold absolute pressure sensor breakout off of the main harness

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S141

In the engine harness, approximately 17 cm (6.7 in) throttle position (TP), from generator harness breakout

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S142 (Gasoline)

In the engine harness, approximately 4 cm (1.6 in) from the throttle position (TP) sensor, toward the breakout

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S203

In the IP harness, approximately 4 cm (1.6 in) from the IP fuse block breakout

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S210

In the IP harness, approximately 4 cm (1.6 in) to the right of the hazard warning switch breakout

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S220

In the IP harness, approximately 15 cm (5.9 in) to the right of the data link connector (DLC) breakout

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S221

In the IP harness, approximately 12 cm (4.7 in) to the right of the data link connector (DLC) breakout

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S230

In the IP harness, approximately 4 cm (1.6 in) to the right of the instrument panel cluster (IPC) connector breakout

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S232

In the IP harness, approximately 59 cm (23.2 in) from the main harness, toward the IP harness connector

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S237

In the engine harness, approximately 15 cm (5.9 in) from the interior side of P102

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S238

In the engine harness, approximately 8 cm (3.1 in) from the interior side of P102

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