GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

A/C Compressor Clutch

On the front of the A/C compressor, in the left front 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 Clutch Relay

In the underhood fuse-relay center, in the left rear side of the engine compartment, on the fender

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

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

A/C Compressor Cycling Switch

On the top right of the A/C accumulator, in the right side of the engine compartment, on the bulkhead

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 Cutout Switch

On the rear of the A/C compressor, in the left front 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 Low Pressure Cutout Switch

On the top of the A/C compressor, in the high pressure refrigerant line

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

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

Camshaft Position Sensor

Top rear center of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Clutch Pedal Position Switch

At top of Clutch Pedal

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Crankshaft Position (CKP) Sensor

Lower RF of Engine Block, near Crankshaft

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module (CCM)

LR of Engine Compartment, on Bulkhead

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Under LH of IP, LH of Steering Column, mounted to bottom of Knee Bolster

Data Link Communications Component Views in Wiring Systems

Data Link Communications Connector End Views in Wiring Systems

Electronic Brake Control Module (EBCM)

Near Brake Master Cylinder, at LF Wheelhousing

Antilock Brake System Component Views in ABS/Traction Control

Antilock Brake System Connector End Views in ABS/Traction Control

Electronic Variable Orifice (EVO)/Passlock Module

Under the center of the IP

Theft Deterrent System Component Views in Theft Deterrent

Theft Deterrent System Connector End Views in Theft Deterrent

Engine Coolant Temperature Sensor (Diesel)

Lower LF of Engine Block

Cooling System Component Views in Engine Cooling

Cooling System Connector End Views in Engine Cooling

Exhaust Gas Recirculation (EGR) Control Pressure/Baro Sensor ( Diesel)

Top of Engine assembly

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Heater (Diesel)

Top rear of Engine in the fuel filter assembly

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump (Diesel)

Inside LH Frame Rail, below LF Door

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump, Secondary (Diesel)

In Auxiliary Fuel Tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump and Sender

In Fuel Tank

Engine Controls Component Views

Engine Controls Connector End Views

Glow Plug Controller

LR of Engine, near Bulkhead

Engine Controls Component Views

Engine Controls Connector End Views

Glow Plug Relay

LR of Engine, near Bulkhead

Engine Controls Component Views

Engine Controls Connector End Views

HVAC Control Module

Part of the heater controls, in the center of the IP, under the radio

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

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

Instrument Cluster

On the upper left end of the IP, above the steering column

Instrument Panel, Gages, and Console Component Views in Instrument Panel and Console

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

Intake Air Temperature (IAT) Sensor (Diesel)

At LF of Engine, near Intake Manifold opening

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

To the left of the IP, near the left front door jamb switch

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Mass Air Flow (MAF) Sensor

At Air Intake Duct, near Air Filter, RH of Engine

Engine Controls Component Views

Engine Controls Connector End Views

Powertrain Control Module (PCM) (Diesel)

Under RH end of IP, above Blower Motor, behind IP Compartment Box

Engine Controls Component Views

Powertrain Control Module Connector End Views

Radio

In the center of the IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Remote Battery Stud

Part of the underhood fuse-relay center, in the left rear side of the engine compartment, on the fender

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Stoplamp Switch

On the top of the brake pedal

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Transfer Case Control Module (TCCM) (Selectable 4WD)

Under IP, near the convience center

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Transfer Case Relay

RR of Engine Compartment, near center of Bulkhead

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Transfer Case Select Switch

Center of IP, RH of Steering Column Shift Lever

Transfer Case Control Component Views or Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views or Transfer Case Control Connector End Views in Transfer Case

Underhood Fuse Block

In the left rear side of the engine compartment, on the fender

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Vehicle Speed Sensor (w/RWD)

LR of Transmission

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (w/Selectable 4WD)

LR of Transfer Case

Engine Controls Component Views

Engine Controls Connector End Views

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

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

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Engine Controls Connector End Views

Wastegate Solenoid (Diesel)

Top LR of Engine, above Valve Cover

Engine Controls Component Views

Engine Controls Connector End Views

Water-in-Fuel Sensor (Diesel)

Top near of Engine

Engine Controls Component Views

Engine Controls Connector End Views

C100

Part of the engine harness to IP harness, in the left rear side of the engine compartment, at the bulkhead

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C103

Part of the engine harness to fuel pump motor, in the left rear side of the engine compartment, under the brake master cylinder

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C112 (Diesel)

Part of the engine harness to engine sensors, center rear of the engine

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C121 (M/T w/4WD)

Engine harness to 4WD extension harness

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Inline Harness Connector End Views in Wiring Systems

C122 (M30)

On the right side of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C122 (MT1)

On the left side of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200

Behind the right side of the IP, near the heater motor, in foam wrap

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C204

Behind the right side of the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C223

At the convenience center

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C227 (Stoplamp Switch)

IP harness, Inline to the Stoplamp Switch

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C266

Part of the IP harness to steering column harness, to the left side of the steering column, near the bulkhead

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

D104 (6.5L)

Part of the engine harness, approximately 28 cm (11 in) from the A/C compressor clutch connector

Harness Routing Views in Wiring Systems

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G104 (6.5L)

Top rear of the right cylinder head

Power and Grounding Component Views in Wiring Systems

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G105 (Diesel)

Right Rear of the cylinder head, cylinder #7 intake bolt

Power and Grounding Component Views in Wiring Systems

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G404

Inside the left side frame rail, near the rear crossmember

Power and Grounding Component Views in Wiring Systems

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P101

In the right rear side of the engine compartment, at the bulkhead

Harness Routing Views in Wiring Systems

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S100 (6.5L - A/T)

Engine harness, approximately 31 cm (12 in) from the taillamp harness breakout

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S100 (6.5L - M/T)

Engine harness, approximately 37 cm (14.5 in) from the EBCM breakout, toward the taillamp harness

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S101 (Diesel)

Engine harness approximately 6.5 cm (2.5 in) from the EBCM harness breakout into the PCM harness

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S103 (5.0L, 5.7L)

Engine harness, approximately 8 cm (3 in) from the EGR valve breakout, toward the taillamp harness breakout

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S107 (5.0L, 5.7L)

Engine harness, approximately 20 cm (8 in) from the EGR valve breakout, toward the taillamp harness breakout

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S108 (Diesel)

Engine harness, approximately 6 cm (2.5 in) from the transmission harness breakout, towards the PCM

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S111 (6.5L)

Engine harness approximately 11 cm (4 in) from the EBCM breakout, toward the glow plugs

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S147 (Diesel)

Engine harness, approximately 4 cm (1.5 in) from the starter motor solenoid breakout

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S150

Engine harness, approximately 13 cm (5 in) from the EBCM breakout

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S152 (Diesel)

Engine harness, approximately 4 cm (1.5 in) from the IP harness breakout, toward P101

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S166 (6.5L - A/T)

Engine harness, approximately 8 cm (3 in) from the fuel heater breakout

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S166 (6.5L - M/T, HD)

Engine harness, approximately 5 cm (2 in) from the glow plugs breakout

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S166 (6.5L - M/T, LD)

Engine harness, approximately 1 cm (0.5 in) from the fuel heater breakout

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S199 (6.5L)

Engine harness, approximately 31 cm (12 in) from the taillamp harness breakout

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S204

IP harness, approximately 10 cm (4 in) from C100, towards the Data Link Connector (DLC)

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S211 (Diesel)

IP harness, approximately 16 cm (6 in) into the instrument cluster breakout

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S213

IP harness, approximately 4 cm (1.5 in) from the steering column harness breakout, towards the DLC

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S215

IP harness, approximately 8 cm (3 in) from the instrument cluster breakout, toward the radio connectors breakout

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S220

IP harness, approximately 6 cm (2.5 in) from the steering column harness breakout, toward C100

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S221

IP harness, approximately 40 cm (15.5 in) from the instrument cluster breakout

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S222

IP harness, approximately 20 cm (8 in) from the inflatable restraint switch breakout

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S268

IP harness, approximately 7 cm (2.5 in) into the HVAC Control Switch harness breakout

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S280

IP harness, approximately 5 cm (2 in) from the DLC breakout

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S298

IP harness, approximately 24 cm (9.5 in) from the instrument cluster breakout, toward the radio breakout

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S299

IP harness, approximately 4 cm (1.5 in) into the steering column harness breakout, toward C266

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S314 (K300)

Selectable 4W harness, approximately 5 cm (2 in) from the transfer case relay breakout, toward the front axle switch

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S318

Taillamp extension harness, approximately 10 cm (4 in) from the fuel pump balance module breakout, toward the engine harness

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