GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Automatic Recirculating Switch

In the air conditioning (A/C) muffler hose assembly, close to the condenser.

HVAC with A/C - Manual

n HVAC with A/C - Manual

A/C Compressor

4.3L, 6.5L (Diesel) - On the left top front of the engine

in HVAC with A/C - Manual

in HVAC with A/C - Manual

A/C Compressor Clutch

On the front of the A/C compressor

in HVAC with A/C - Manual

in HVAC with A/C - Manual

A/C Compressor Clutch Relay

In the underhood bussed electrical center (UBEC)

in Wiring Systems

in HVAC with A/C - Manual

A/C Compressor High Pressure Cutout Switch

In the rear of the A/C compressor

in HVAC with A/C - Manual

in HVAC with A/C - Manual

A/C Compressor Low Pressure Cycling Switch

On the right side of the A/C accumulator

in HVAC with A/C - Manual

in HVAC with A/C - Manual

Accelerator Pedal Position (APP) Sensor

Part of the accelerator pedal assembly (Diesel only)

in Engine Controls - 6.5L

 

Automatic Transfer Case (ATC) Control Module

To the left of the instrument cluster behind the headlamp switch

in Automatic Transfer Case

in Automatic Transfer Case

Automatic Transmission

Under the vehicle attached to the rear of the engine

  

Automatic Transmission Input Speed Sensor

Inside the automatic transmission assembly

in Automatic Transmission - 4L80E

in Automatic Transmission - 4L80E

Body Control Module (BCM)

On the lower left side of the IP below the steering column

in Body Control System

in Body Control System

Boost Pressure Sensor (Diesel)

On the top of the engine in front of the EGR valve

in Engine Controls - 6.5

in Engine Controls - 6.5L

Camshaft Position (CMP) Sensor

Part of the injector pump

in Engine Controls - 6.5L

in Wiring Systems

Clutch Pedal Position (CPP) Switch

On the top of the clutch pedal assembly near the reservoir

in Engine Electrical

in Engine Electrical

Crankshaft Position (CKP) Sensor (Diesel)

On the left side of the front engine cover

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Cruise Control Module

On the left front of the dash in the engine compartment

in Cruise Control

in Cruise Control

Cruise Control Switch

On the left side of the steering column on the multifunction switch

in Cruise Control

in Cruise Control

Data Link Connector (DLC)

On the left lower dash below the steering column

in Wiring Systems

in Wiring Systems

Electronic Brake Control Module (EBCM)

On the left side of the inner frame

in Antilock Brake System

in Antilock Brake System

Engine Coolant Temperature (ECT) Sensor (Diesel)

At the right top of the engine near the thermostat housing

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Engine Shut Off Solenoid (Diesel)

On top of the fuel injection pump

n Engine Controls - 6.5L

in Engine Controls - 6.5L

Exhaust Gas Recirculating (EGR) Solenoid (Diesel)

At the top left rear of the engine assembly

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Exhaust Gas Recirculation (EGR) Valve

On the top of the intake plenum

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Front Axle Actuator/Switch

On the axle housing on the right side of the center

in Automatic Transfer Case

in Automatic Transfer Case

Fuel Heater (Diesel)

Near the top rear of the engine

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Fuel Pump (Diesel)

On the left inner frame rail near the EBCM

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Fuel Pump Relay (FPR)

In the UBEC

in Wiring Systems

in Wiring Systems

Fuel Pump Relay (FPR) (Diesel)

In the UBEC

in Wiring Systems

in Wiring Systems

Fuel Pump/Level Sensor

In the fuel tank

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Fuel Sender (Diesel)

In the fuel tank

in Instrument Panel, Gauges and Console

in Instrument Panel, Gauges and Console

Fuel Solenoid Driver (Diesel)

On the left side of the fuel injection pump

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Fuel Temperature Sensor (Diesel)

On the top of the fuel injection pump

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Generator

On 4.3L and 6.5L - On the right front of the engine

in Engine Electrical

in Engine Electrical

Glow Plug Module (Diesel)

On the top left rear of the engine

in Engine Controls - 6.5L

in Engine Controls - 6.5L

HVAC Control Module

Under the radio in the center of the IP

in HVAC with A/C - Manual

in HVAC with A/C - Manual

Injection Pump (Diesel)

On the top center front of the engine

in Engine Controls - 6.5L

in Engine Controls 6.5L

Injection Timing Stepper Motor (Diesel)

On the injection pump

in Engine Controls - 6.5L

in Engine Controls 6.5L

Instrument Cluster

On the left side of the IP above the steering column

in Instrument Panel, Gauges and Console

in Instrument Panel, Gauges and Console

Intake Air Temperature (IAT) Sensor (Diesel)

On top of the intake near the EGR valve

in Engine Controls - 6.5L

in Engine Controls 6.5L

Left Bussed Electrical Center (LBEC)

On the lower left side of the IP

in Wiring Systems

in Wiring Systems

Manifold Absolute Pressure (MAP) Sensor (Diesel)

On the front of the dash in the engine compartment

in Engine Controls - 6.5L

in Engine Controls 6.5L

Mass Air Flow (MAF) Sensor

In the air induction tube near the air cleaner assembly

in Engine Controls - 6.5L

in Engine Controls 6.5L

Mid Bussed Electrical Center (MBEC)

Under the left side of the instrument panel near the left kick panel

in Wiring Systems

in Wiring Systems

Park/Neutral Position Switch

On the left side of the transmission

in Engine Controls - 6.5L

in Engine Controls 6.5L

Powertrain Control Module (PCM)

Near the left front inside the engine compartment

in Engine Controls - 6.5L

in Engine Controls 6.5L

Recirculation Door Motor (HVAC)

In the top center of the HVAC module assembly

in HVAC with A/C - Manual

in HVAC with A/C - Manual

Stoplamp Switch

At the top of the brake pedal

in Lighting Systems

in Lighting Systems

Tow/Haul Switch

In the end of the automatic transmission shift lever

--

n Automatic Transmission - 4L80E

Transfer Case Switch

On the left front of the transfer case

--

in Manual Transfer Case

Underhood Bussed Electrical Center (UBEC)

At the left side of the engine compartment near the battery

in Wiring Systems

in Wiring Systems

Vehicle Speed Sensor (VSS)

In the extension housing on the left side of the transmission

in Engine Controls - 6.5L

in Engine Controls 6.5L

Waste Gate Solenoid (Diesel)

On the top of the engine over the left rear of the rocker cover

in Engine Controls - 6.5L

in Engine Controls - 6.5L

Water in Fuel (WIF) Sensor (Diesel)

In the fuel filter

in Engine Controls - 6.5L

in Engine Controls - 6.5L

C100

Under the UBEC

in Wiring Systems

in Wiring Systems

C105

At the left side of the engine compartment near the UBEC

in Wiring Systems

in Wiring Systems

C147

Near the left cylinder head

in Wiring Systems

n Wiring Systems

C150

On the left inner fender inside the engine compartment

n Wiring Systems

in Wiring Systems

C151

On the left inner fender near the UBEC

in Wiring Systems

in Wiring Systems

C152

On the left inner fender under the UBEC

in Wiring Systems

in Wiring Systems

C153

On the left inner fender near the UBEC

in Wiring Systems

in Wiring Systems

C201

On the steering column under the IP

in Wiring Systems

in Wiring Systems

C201B

On the steering column under the IP

in Wiring Systems

in Wiring Systems

C201C

On the steering column under the IP

in Wiring Systems

in Wiring Systems

C202

On the left side of the IP on the back of the cluster

in Wiring Systems

in Wiring Systems

C204

At the left A pillar near the kick panel

in Wiring Systems

in Wiring Systems

G100

On the left radiator support bracket

in Wiring Systems

--

G103

On the right rear of the engine block

in Wiring Systems

--

G104

On the left rear of the engine block

in Wiring Systems

--

G203

On the left upper IP at the A pillar

in Wiring Systems

--

G403

On the left frame rail near the body mount

in Wiring Systems

--

P100

At the left rear of the engine compartment in the front of the dash

in Wiring Systems

--

Splice Pack 203 (SP203)

On the top left side of the IP near the A pillar

in Wiring Systems

in Wiring Systems

S102

In the engine harness

--

--

S103

In the engine harness

--

--