GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

ABS/TCC Switch

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

8A-201-27,

Fig 51

8A-202-71

Brake Booster Vacuum Sensor

Left hand rear of the engine compartment, on the brake booster

8A-201-6,

Fig 12

8A-202-73

Camshaft Position (CMP) Sensor

Right hand rear corner of the engine, in the cam carrier, near the ignition coils

8A-201-19,

Fig 38

8A-202-74

Continuously Variable Road Sensing Suspension (CVRSS) Module

Right hand rear of the passenger compartment, behind the rear seat, on the electronics bay

8A-201-41,

Fig 76

8A-202-37, 38

Crankshaft Position (CKP) Sensor A

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

8A-201-11,

Fig 22

8A-202-76

Crankshaft Position (CKP) Sensor B

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

8A-201-11,

Fig 22

8A-202-76

Cruise Control Module

Left hand rear of the engine compartment, on the left hand strut tower

8A-201-6,

Fig 13

8A-202-39

Data Link Connector (DLC)

Under left hand of the instrument panel, on the hood release bracket

8A-201-24,

Fig 45

8A-202-40

Electronic Brake and Traction Control Module (EBTCM)

Left hand front corner of the engine compartment, on the brake pressure modulator valve

8A-201-5,

Fig 10

--

Engine Compartment Fuse/Relay

Center

Left hand of the engine compartment, near the front strut tower

8A-201-4,

Fig 9

--

Engine Coolant Temperature (ECT) Sensor

Left hand rear corner of the engine, below the exhaust gas recirculation valve

8A-201-17,

Fig 34

8A-202-79

Engine Cooling Fan Relay 1

Center front of the engine compartment, on the lower radiator support, near the cooling fans

8A-201-2,

Fig 5

8A-202-79

Engine Cooling Fan Relay 2

Center front of the engine compartment, on the lower radiator support, near the cooling fans

8A-201-2,

Fig 5

8A-202-79

Engine Cooling Fan Relay 3

Center front of the engine compartment, on the lower radiator support, near the cooling fans

8A-201-2,

Fig 5

8A-202-79

Engine Oil Level Switch

Bottom front of the engine, in the engine oil pan, near the A/C compressor

8A-201-13,

Fig 25

8A-202-79

Engine Oil Pressure Switch

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

8A-201-11,

Fig 22

8A-202-80

Evaporative Emissions (EVAP) Control Solenoid

Left hand rear of the engine, on the cam cover, near the ignition coils

8A-201-17,

Fig 33

8A-202-80

Evaporative Emissions (EVAP) Vacuum Purge Switch

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

8A-201-17,

Fig 33

8A-202-108

Exhaust Gas Recirculation (EGR) Valve

Left hand rear of the engine, on the cam cover, near the ignition coils

8A-201-17,

Fig 33

8A-202-80

Front Heated Oxygen Sensor (HO2S)

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

8A-201-13,

Fig 26

8A-202-81

Fuel Injectors

Top of the engine, below the fuel rail

6 -- Engine Controls

6 -- Engine Controls

Fuel Tank Unit

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

6 -- Engine Controls

8A-202-82

Generator

Right hand front corner of the engine, near the battery

8A-201-11,

Fig 22

8A-202-82

Idle Air Control (IAC) Valve

Left hand of the engine, on the front of the throttle body

8A-201-14,

Fig 28

8A-202-83

Ignition Control Module (ICM)

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

8A-201-10,

Fig 21

8A-202-84, 85

Instrument Panel Cluster (IPC)

Left hand of the instrument panel, above the steering column

8A-201-22,

Fig 42

--

Intake Air Temperature (IAT) Sensor

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

6 -- Engine Controls

8A-202-87

Knock Sensor

Center of the engine, below the intake manifold, in the cylinder valley

6 -- Engine Controls

6 -- Engine Controls

LH Cooling Fan Motor

Left hand front of the engine compartment, behind the radiator

8A-201-2,

Fig 5

8A-202-87

Manifold Absolute Pressure (MAP) Sensor

Top left hand front of the engine, right of the throttle body

6 -- Engine Controls

6 -- Engine Controls

Mass Air Flow (MAF) Sensor

Left hand center of the engine, on the throttle body

8A-201-14,

Fig 28

8A-202-96

Park/Neutral Position (PNP) Switch

Left hand of the transmission, below the throttle body

8A-201-16,

Fig 32

8A-202-97

Post Catalytic Converter Heated Oxygen Sensor (HO2S)

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

8A-201-20,

Fig 40

8A-202-98

Power Steering Pressure (PSP) Switch

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

8A-201-18,

Fig 35

8A-202-99

Powertrain Control Module (PCM)

Left hand front corner of the engine compartment, under the air cleaner housing

6 -- Engine Controls

6 -- Engine Controls

Pre Catalytic Converter Heated Oxygen Sensor (HO2S)

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

8A-201-20,

Fig 40

8A-202-100

Rear Heated Oxygen Sensor (HO2S)

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

8A-201-18,

Fig 36

8A-202-81

RH Cooling Fan Motor

Right hand front of the engine compartment, behind the radiator

8A-201-2,

Fig 5

8A-202-87

Throttle Position (TP) Sensor

Left hand side of the engine, on the front of the throttle body

8A-201-14,

Fig 28

8A-202-107

Trunk Compartment Fuse Block

Left hand front of the rear compartment, on the electronics bay

8A-201-41,

Fig 76

--

Vehicle Speed Sensor (VSS)

Right hand of the transaxle, near the right hand engine mount

6 -- Engine Controls

8A-202-109

C101

Forward of the left hand strut tower, near the engine compartment fuse/relay center

8A-201-4,

Fig 9

8A-202-0

C106

Left hand front corner of the engine, near the electronic brake and traction control module

8A-201-16,

Fig 13

8A-202-2

C127

Left hand center top of the engine, below the throttle body

8A-201-14,

Fig 27

8A-202-3

C131

Right hand rear corner of the engine, near the cam cover

8A-201-19,

Fig 38

8A-202-15

C205

Under right hand of the instrument panel, near the kick panel

8A-201-29,

Fig 55

8A-202-8

C401

Right hand rear corner of the passenger compartment, taped in the body harness

8A-201-39,

Fig 73

8A-202-25

C415

Under center rear of the vehicle, on the rear suspension support

8A-201-52,

Fig 96

8A-202-29

G102

Lower right hand rear of the engine, near the power steering rack

8A-201-19,

Fig 37

--

G107

Lower left hand front corner of the engine, below the thermostat housing

8A-201-16,

Fig 31

--

G109

Left hand rear corner of the engine, near the park/neutral position switch

8A-201-17,

Fig 34

--

G203

Left hand front corner of the passenger compartment, behind the kick panel

8A-201-23,

Fig 44

--

G401

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

8A-201-43,

Fig 78

--

P100

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

8A-201-10,

Fig 20

--

P101

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

8A-201-5,

Fig 11

--

P400

Rear of the passenger compartment, near the electronics bay

8A-201-41,

Fig 76

--

P500

Front of the left hand front door jamb, near the door hinges

8A-201-43,

Fig 79

--

S110

Fuel rail harness, approx 26.5 cm from the C127 connector

8A-201-15,

Fig 29

--

S111

Fuel rail harness, approx 20 cm from the C127 connector

8A-201-15,

Fig 29

--

S117

Engine harness, approx 34 cm from the RH cooling fan connector

8A-201-2,

Fig 5

--

S118

Engine harness, approx 16.5 cm from the powertrain control module connector breakout

8A-201-16,

Fig 31

--

S123

Engine harness, approx 4 cm from the powertrain control module connector breakout

8A-201-14,

Fig 27

--

S124

Engine harness, approx 35 cm into the powertrain control module connector breakout

8A-201-14,

Fig 27

--

S125

Engine harness, approx 4 cm from the C127 connector breakout

8A-201-14,

Fig 28

--

S126

Engine harness, approx 10.5 cm from the C127 connector breakout

8A-201-14,

Fig 28

--

S127

Engine harness, approx 10 cm from G109 breakout

8A-201-17,

Fig 34

--

S129

Engine harness, approx 4 cm from the C129 connector breakout

8A-201-2,

Fig 5

--

S130

Engine harness, approx 6.5 cm from the EBTCM connector breakout

8A-201-2,

Fig 5

--

S149

Engine harness, approx 10 cm from the C101 connector breakout

8A-201-16,

Fig 32

--

S201

Body harness, approx 2.5 cm from G204 breakout

8A-201-23,

Fig 44

--

S221

Body harness, approx 15 cm from the C205 connector

8A-201-29,

Fig 55

--

S318

Body harness, approx 17 cm from the sensing and diagnostic module connector breakout

8A-201-34,

Fig 65

--

S324

Body harness, approx 6.5 cm from the radio connector breakout

8A-201-36,

Fig 68

--

S402

Body harness, approx 29 cm into the cross car breakout

8A-201-43,

Fig 78

--

S413

Body harness, approx 15 cm from the C415 connector

8A-201-46,

Fig 84

--

S505 (DeVille)

Body harness, approx 46 from the C500 connector breakout

8A-201-43,

Fig 79

--

S505 (Eldorado)

Body harness, approx 44 cm from the C500 connector breakout

8A-201-43,

Fig 79

--

S505 (Seville)

Body harness, approx 59 cm from the C500 connector breakout

8A-201-43,

Fig 79

--