GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Group No.

A/C Compressor Clutch Cycling Switch

In low pressure refrigerant line

210-10 Fig. 16

--

--

A/C Compressor Clutch Relay

In low pressure refrigerant line

210-10 Fig. 16

--

--

A/C High Pressure Cutout Switch

On rear portion of A/C compressor

201-6 Fig. 12

--

--

Air Injection Reaction (Secondary) Clutch

On front of pump

--

--

--

Air Injection Reaction (Secondary) Pump

Front of Engine

--

--

--

Air Injection Reaction (Secondary) Relay

In Underhood Fuse-relay Center

--

--

--

Auxiliary Cooling Fan Relay

LH rear side of Engine Compartment

201-4 Fig. 9

--

--

Camshaft Position Sensor

In Distributor

201-7 Fig. 13

--

--

Clutch Pedal Position Switch

At top of Clutch pedal

--

--

--

Crankshaft Position (CKP) Sensor

Lower RH front portion of Engine block, near Crankshaft

201-7 Fig. 13

--

2.383

Cruise Control Module

LH rear side of Engine Compartment on Bulkhead

201-24 Fig. 38

202-16

--

Data Link Connector (DLC)

Under LH side of I/P

201-28 Fig. 41

202-17

--

Distributor

Top of Engine at rear bulkhead

--

--

--

Electronic Brake Control Module (EBCM)

Near Brake Master Cylinder, at LH front Wheelhouse

201-4 Fig. 9

--

--

Engine Coolant Temperature (ECT) Sensor

RH Top front of Engine near Thermostat Housing

201-10 Fig. 16

--

3.682

Evaporative Emission Canister Purge Solenoid

RH Center on Intake Manifold

201-7 Fig. 13

--

3.140

Evaporative Emissions Canister Vent

LH front of Electronic Brake Control Module

--

202-49

--

Evaporative Emission Purge Solenoid Vacuum Switch

Top of Engine

201-7 Fig. 13

--

3.140

Exhaust Gas Recirculation (EGR) Valve Solenoid

Front of Engine near Thermostat Housing

201-7 Fig. 13

202-47

3.670

Front Axle Switch

RH side of Front Drive Axle

201-19 Fig. 28

--

--

Fuel Injectors # 1 through #8

In Intake Manifold

201-14 Fig. 20

202-20

3.300

Fuel Pump and Sender

In Fuel Tank

--

202-47

--

Fuel Pump Oil Pressure Switch

Rear Top Center of Engine, behind Distributor

201-8 Fig. 14

202-45

1.800

Fuel Pump Prime Connector

I/P Harness, approximately 20 cm into the Fuse- Relay Center Breakout

--

202-47

--

Fuel Pump Relay

Located in Underhood Fuse Relay Center

201-4 Fig. 9

--

--

Fuel Tank Pressure Sensor

Located in Fuel Tank

--

202-49

--

Fuel Tank Sender Module

RH side of passenger compartment under I/P near Blower Motor

--

201-21

--

Headlamp and Dimmer Switch

Lower LH side of I/P

201-25 Fig. 39

--

--

Heated Oxygen Sensors #1 through #4

In Exhaust Pipe, in front and back of Catalytic Converters

201-19 Fig. 29

202-48

3.682

Heater and A/C Control Module

Center of I/P at Heater Control

--

--

--

Idle Air Control (IAC) Valve Motor

Attached to RH rear of Throttle Body

201-6 Fig. 12

--

3.820

Ignition Control Module

RH side rear of Engine

201-7 Fig 13

202-46

--

Ignition Coil

RH side rear of engine

201-14 Fig. 20

--

--

Instrument Cluster

LH Upper End of I/P

--

202-28

--

Intake Air Temperature (IAT) Sensor

In Air Intake Duct

201-13 Fig. 19

--

3.682

I/P Fuse Block

Lower LH side of I/P

201-25 Fig. 39

--

--

Knock Sensor

RH side of Engine Block, below Exhaust Manifold, forward of Starter

201-14 Fig. 20

--

2.383

Manifold Absolute Pressure (MAP) Sensor

Top RH Center of Intake manifold near injectors

201-7 Fig. 13

--

3.682

Mass Air Flow (MAF) Sensor

Air Intake Duct near air filter

201-13 Fig. 19

--

3.682

Power Steering Control Module

Under Center of I/P

201-28 Fig. 45

202-26

--

Park/Neutral Position Switch

On LH side center of Transmission

201-17 Fig. 25

--

--

Radio

Center of I/P

201-31 Fig. 51

202-32

--

Recirculation Door Motor

Under I/P on Heater - A/C Plenum

--

--

--

Throttle Position (TP) Sensor

On the side of the Throttle Body

201-6 Fig. 12

--

3.682

TCC/Stoplamp Switch

Top of Brake Pedal

201-29 Fig. 48

--

--

Transfer Case Control Module (TCCM)

On Steering Column Support

--

202-32

--

Transfer Case Relay

RH Rear of Engine Compartment near center of cowl

201-19 Fig. 28

202-48

--

Transmission Input Speed Sensor (4L80E Automatic Transmission)

LH side of the Transmission near the front

201-21 Fig. 31

202-48

--

Underhood Fuse- Relay Center

LH Rear of Engine Compartment, on Fender

201-4 Fig. 8

--

--

Vehicle Control Module (VCM)

Engine Compartment, near EBCM

201-24 Fig. 37

--

3.670

Vehicle Speed Sensor (VSS)

LH rear side of transmission (LH side of transfer case w/ 4WD)

201-19 Fig. 29

--

3.682

Vehicle Speed Sensor (VSS) Adapter (A/T w/4WD)

Male-to-male connector adapter from the engine harness to the 4WD extension harness

--

--

--

Wheel Speed Sensor, LH front

At LH front wheel

--

--

--

Wheel Speed Sensor, RH front

At RH front wheel

--

--

--

C100

LH rear of Engine Compartment, at Bulkhead

201-3 Fig. 7

202-0

--

C103

LH rear of Engine Compartment, under Brake Master Cylinder

--

202-39

--

C105 (VIN J)

Rear of Intake manifold, near center

201-14 Fig. 20

202-2

--

C107

LH front side of Transmission

201-19 Fig. 29

202-39

--

C120

Rear of Engine, near Transmission

201-22 Fig. 34

202-40

--

C130

Engine Harness, approximately 17.5 cm from Vehicle Control Module breakout

--

--

--

C200

Behind RH portion of I/P, near Heater Motor, in Foam Wrap

201-24 Fig. 38

202-5,6

--

C227

Under LH side of I/P, near Stoplamp Switch

201-29 Fig. 48

202-42

--

C230

Behind RH side of I/P, above HVAC Evaporator Housing

201-27 Fig. 42

202-42

--

D104

Engine Harness, approximately 8 cm from A/C Compressor Clutch connector

--

--

--

G103

RH front of Engine, near Thermostat Housing

201-10 Fig. 16

--

--

G104

RH top of Cylinder head, near center

201-12 Fig. 18

--

--

G200

Behind LH side of I/P, below Fuse Block

201-25 Fig. 39

--

--

P100

LH rear of Engine Compartment at Bulkhead

201-3 Fig. 7

--

--

P101

RH rear of Engine Compartment at Bulkhead

--

--

--

S101

Engine Harness, approximately 11 cm from Underhood Fuse-Relay Center breakout

--

--

--

S103 (VIN M,R)

Engine Harness, approximately 11 cm from Breakout to EGR Valve toward Taillamp Harness Breakout

--

--

--

S103 (VIN J)

Engine Harness, approximately 12 cm from Fuel Injector Breakout toward Taillamp Harness Breakout

--

--

--

S104

Engine Harness, approximately 8 cm into Breakout to Fuel Injector Connector

--

--

--

S106 (VIN M,R)

Engine Harness, approximately 17 cm from Breakout to EGR Valve toward Fuel Injector Breakout

--

--

--

S106 (VIN J)

Engine Harness, approximately 6.5 cm from Breakout to EGR Valve toward Underhood Lamp

--

--

--

S107 (VIN M,R)

Engine Harness, approximately 35 cm from Breakout to EGR Valve toward Taillamp harness Breakout

--

--

--

S107 (VIN J)

Engine Harness, approximately 18 cm from Fuse-Relay Center Breakout toward Taillamp harness Breakout

--

--

--

S108

Engine Harness, approximately 12 cm from Ignition Coil Breakout, toward Starter Solenoid

--

--

--

S111

Engine Harness, approximately 8 cm from Fuse-Relay Center Breakout toward Tailamp Harness Breakout

--

--

--

S145 (VIN J)

Engine Harness, approximately 11 cm into EGR Valve Breakout

--

--

--

S146 (VIN J)

Engine Harness, approximately 22 cm into Underhood Fuse-Relay Center Breakout

--

--

--

S147 (VIN M,R)

Engine Harness, approximately 7 cm from EGR Breakout, toward Taillamp Harness Breakout

--

--

--

S147 (VIN J)

Engine Harness, approximately 5 cm from Fuel Injector Breakout, toward EGR Breakout

--

--

--

S149

Oxygen Sensor Jumper Harness approximately 22 cm into Harness

--

--

--

S150

Engine harness, approximately 13 cm into EBCM Breakout

--

--

--

S151

Engine Harness, approximately 6.5 cm into EBCM Breakout

--

--

--

S152

Engine Harness, approximately 6.5 cm from Underhood Fuse-Relay Center Breakout, toward VCM

--

--

--

S153

Engine Compartment, I/P Harness, approximately 12.5 cm from P100 toward Cruise Control Module

--

--

--

S154 (VIN J)

In Injector Harness Jumper

--

--

--

S155 (VIN J)

In Injector harness Jumper

--

--

--

S161

Engine Harness, approximately 8 cm from EGR Harness Breakout, toward Injector Harness Breakout

--

--

--

S162 (VIN M,R)

Engine Harness, approximately 17.5 cm from Starter Solenoid Breakout, toward LH Oxygen Sensor Breakout

--

--

--

S162 (VIN J)

Engine Harness, approximately 41 cm from LH Oxygen Sensor Breakout, toward Starter Solenoid Breakout

--

--

--

S163

Engine Harness, approximately 38.5 cm from Underhood Fuse-Relay Center toward VCM

--

--

--

S180 (Manual Transmission)

Engine Harness, approximately 22 cm from Under Hood Lamp Breakout, toward Engine

--

--

--

S180 (Automatic Transmission)

Engine Harness, approximately 37 cm from Under Hood Lamp Breakout, toward Engine

--

--

--

S204

I/P Harness, approximately 8 cm from DLC Harness C100

--

--

--

S212

I/P Harness, approximately 8 cm from Radio Harness Breakout, toward AUX Power Outlets

--

--

--

S213

I/P Harness, approximately 13.5 cm from DLC Harness Breakout, toward C100

--

--

--

S215

I/P Harness approximately 8 cm from I/P Cluster Breakout, Toward Radio Harness Breakout

--

--

--

S221

I/P Harness, approximately 20 cm from I/P Cluster Breakout, toward Radio Harness Breakout

--

--

--

S222

I/P Harness, approximately 20 cm from right of Heater and A/C Control Breakout

--

--

--

S231

Engine harness, approximately 16 cm from Breakout to EGR Valve toward Taillamp Harness

--

--

--

S268

I/P Harness, approximately 6.5 cm from Heater A/C Control Connector Breakout

--

--

--

S272

I/P Harness, approximately 4 cm into Auxiliary Power Outlet Breakout

--

--

--

S280

I/P Harness, approximately 5 cm onto DLC Breakout

--

--

--

S298

I/P Harness, approximately 24 cm from I/P Cluster Breakout, toward Radio Breakout

--

--

--

S314 (K300)

4WD Harness, approximately 5 cm from Transfer Case Relay Breakout, toward front Axle Switch

--

--

--

S317

Taillamp Extension Harness, approximately 10 cm from Fuel Pump and Sender Breakout, toward Engine Harness

--

--

--

S318

Taillamp Extension Harness, approximately 10 cm from Fuel Pump Balance Module Breakout, toward Engine Harness

--

--

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