GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

1-2 Shift Solenoid (1-2 SS) Valve

In the automatic transmission

Automatic Transmission Electronic Component Views in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

2-3 Shift Solenoid (2-3 SS) Valve

In the automatic transmission

Automatic Transmission Electronic Component Views in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

3-2 Shift Solenoid (3-2 SS) Valve

In the automatic transmission

Automatic Transmission Electronic Component Views in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

A/C Compressor Clutch

Part of the A/C compressor

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 Diode (4.3L Engine)

In the engine harness breakout, 8 cm from the breakout to the A/C compressor high pressure switch

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

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A/C Compressor Clutch Relay

In the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

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A/C Compressor Cycling Switch (4.3L Engine)

At the A/C accumulator

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 Cutoff Switch (4.3L Engine)

Rear of the A/C compressor

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

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

Air Injection Reactor (AIR) Fuse Block

Mounted to the RF fender next to the battery

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Air Injection Reactor (AIR) Pump Connector C1 (2 Cavities) (w/California Emissions)

In the lower right front engine compartment area

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Engine Controls Connector End Views

Air Injection Reactor (AIR) Pump Connector  C2 (2 Cavities) (w/California Emissions)

In the lower right front engine compartment area

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Engine Controls Connector End Views

Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch

In the Automatic Transmission

Automatic Transmission Electronic Component Views in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Battery Mega® Fuse

In the lower RH of the radiator support, below the battery

Engine Electrical Component Views in Engine Electrical

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Body Relay Block

LH of the dash, right of the IP Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Body Control Module (BCM) Connector C1, Brown (24 Cavities)

Lower rear of the IP, on the heater

Body Control System Component Views in Body Control System

Body Control System Connector End Views in Body Control System

Body Control Module (BCM) Connector C2, Blue (24 Cavities)

Lower rear of the IP, on the heater

Body Control System Component Views in Body Control System

Body Control System Connector End Views in Body Control System

Camshaft Position (CMP) Sensor (4.3L Engine)

Rear of the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Central Sequential Fuel Injection (CSFI) Connector (4.3L Engine)

Top center of the engine, forward of the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Crankshaft Position (CKP) Sensor (4.3L Engine)

Below the RF of the engine, near the harmonic balancer

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Module (CCM)

LH Rear of the engine compartment, on the cowl

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Lower LH of the IP

Data Link Communications Component Views in Data Link Communications

Data Link Communications Connector End Views in Data Link Communications

Electronic Brake Control Module (EBCM)

On the Brake Pressure Modulator Valve (BPMV), LH rear wheelwell

Antilock Brake System Component Views in Antilock Brake System

Antilock Brake System Connector End Views in Antilock Brake System

Electronic Brake Control Module (EBCM) Connector C1 (10 Cavities)

The body harness connector on the LH of the EBCM

Antilock Brake System Component Views in Antilock Brake System

Antilock Brake System Connector End Views in Antilock Brake System

Electronic Climate Control (ECC) Module (w/ Auto A/C)

The IP harness center of the IP, below the radio

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

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

Engine Coolant Temperature (ECT) Sensor (4.3L Engine)

LH side of engine, at the spark plugs

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative (EVAP) Emission Canister Purge Valve (4.3L Engine)

Top RH center of the engine, near the fuel injector connector

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve (4.3L Engine)

Top front of the engine, near the drive belt

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injectors #1-6 (4.3L Engine)

Part of the Central Sequential Fuel Injection (CSFI) (4.3L Engine)

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Relay

In the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

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Fuse Holder

Engine compartment, to the right of the radiator

Power and Grounding Component Views in Wiring Systems

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Generator (4.3L Engine)

RF of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1, Sensor 1 (4.3L Engine)

LH Rear of the exhaust pipe, LH of the transmission

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 1, Sensor 3 (4.3L Engine)

Rear of the catalytic converter, in the exhaust pipe

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2, Sensor 1 (4.3L Engine)

RH side of the engine, in the exhaust pipe

Engine Controls Component Views

Engine Controls Connector End Views

Heater and A/C Controller (w/ Man A/C) Connector C2 (3 Cavities) (Heater Control Lamp)

Next to the vacuum harness connector

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

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

Idle Air Control (IAC) Valve (4.3L Engine)

Top of the engine, on the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil (4.3L Engine)

Top RH of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Control Module (ICM) (4.3L Engine)

Top RH of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

In the IP, ahead of the steering column

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

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

Intake Air Temperature (IAT) Sensor (4.3L Engine)

LF of the engine compartment, in the air intake duct

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

LH of the IP, near the door jamb switch, LF

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Knock Sensor (4.3L Engine)

Top rear of the engine, above the transmission bell housing, on the LH side

Engine Controls Component Views

Engine Controls Connector End Views

Manifold Absolute Pressure (MAP) Sensor (4.3L Engine)

Top center of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor (4.3L Engine)

LF of the engine compartment, on the air intake duct

Engine Controls Component Views

Engine Controls Connector End Views

Park/Neutral Position (PNP) Switch, Connector C1 (7 Cavities)

LH of the transmission

Tilt Wheel/Column Component Views in Steering Wheel and Column - Tilt

Tilt Wheel/Column Connector End Views in Steering Wheel and Column - Tilt

Park/Neutral Position (PNP) Switch, Connector C2 (4 Cavities)

LH of the transmission

Tilt Wheel/Column Component Views in Steering Wheel and Column - Tilt

Tilt Wheel/Column Connector End Views in Steering Wheel and Column - Tilt

Pressure Control Solenoid (PC SOL) Valve

In the automatic transmission

Automatic Transmission Electronic Component Views in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Radio (Except Bravada) Connector C2, (10 Cavitites)

Center of IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Radio (Bravada)

Center of IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

TCC/Stop Lamp Switch

Mounted on the brake pedal

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Throttle Position (TP) Sensor (4.3L Engine)

Top LH of the engine, on the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Torque Converter Clutch Pulse Width Modulation Solenoid (TCC PWM SOL) Valve

In the automatic transmission

Automatic Transmission Electronic Component Views in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Torque Converter Clutch Solenoid (TCC SOL) Valve

In the automatic transmission

Automatic Transmission Electronic Component Views in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Transfer Case Shift Control Module Connector C1 (32 Cavities) (Bravada)

Behind RH Front kick panel, the lower connector

Transfer Case Control Component Views in Transfer Case

Transfer Case Control Connector End Views in Transfer Case

Transmission Fluid Temperature (TFT) Sensor

Part of the Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch

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Underhood Fuse Block

On the top of the left inner wheelwell

Power and Grounding Component Views in Wiring Systems

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Underhood Fuse Block Connector C1 (68 Cavities) (Body)

Below the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Underhood Fuse Block Connector C2 (68 Cavities) (Engine)

Below the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Underhood Fuse Block Connector C3 (32 Cavities) (Chassis)

Below the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Vehicle Control Module (VCM) (4.3L Engine)

RH of the engine compartment

Engine Controls Component Views

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Vehicle Control Module (VCM) (4.3L Engine) Connector C1 Blue (32 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Control Module (VCM) (4.3L Engine) Connector C2 Red (32 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Control Module (VCM) (4.3L Engine) Connector C3 Clear (32 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Control Module (VCM) (4.3L Engine) Connector C4 (24 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Speed Sensor (VSS) (4.3L Engine w/ A/T)

RH rear of the A/T

Automatic Transmission Electronic Component Views in Automatic Transmission

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) (4.3L Engine, Bravada)

To RH rear of the auto 4WD transfer case

Automatic Transmission Electronic Component Views in Automatic Transmission

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) (4.3L Engine w/ M/T)

To the left rear of the M/T

Automatic Transmission Electronic Component Views in Automatic Transmission

Engine Controls Connector End Views

C100 (6 Cavities) (4.3L Engine)

Engine harness to heated oxygen sensor extension harness, rear of engine compartment, near the A/C accumulator

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C101 (10 Cavities) (4.3L Engine)

Engine harness to body harness, RH of the engine compartment, near the VCM

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C104 (6 Cavities) (4.3L Engine)

Chassis to engine harness, LH top of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C108 (7 Cavities) (w/ Auto 4WD) (Bravada)

Transfer case extension harness to body harness, LH Rear engine compartment near cowl penetration P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C108 (16 Cavities) (w/o Auto 4WD) (Except Bravada)

Transfer case extension harness to body harness, LH rear engine compartment near cowl penetration P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C114 (2 Cavities) (w/ Auto 4WD) (Bravada)

Body harness to front axle switch extension harness, LH center of the engine compartment, near the EBCM

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C116 (2 Cavities)

Engine harness to Active Transfer Case harness, near the top RH Rear of the A/T

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C117 (w/ California Emissions)

Engine harness to AIR harness, near VCM

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C175 (13 Cavities)

Engine harness to A/T connector, on the right side of the A/T

Harness Routing Views in Wiring Systems

Automatic Transmission Inline Harness Connector End View in Automatic Transmission

C203 (116 Cavities)

Body harness to IP harness, to the RH of the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Pickup)

Body harness to dome harness, at the LF of the IP, at the LF window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Utility)

Body harness to dome harness, at the LF of the IP, at the LF window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G100 (4.3L Engine w/ California Emissions)

Between the AIR Pump breakout and the breakout to the engine harness

Harness Routing Views in Wiring Systems

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G102 (4.3L Engine)

Engine harness, RH rear of the cylinder head

Harness Routing Views in Wiring Systems

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G103 (4.3L Engine)

(CKT 351) Engine harness, RH Rear of the cylinder head

Harness Routing Views in Wiring Systems

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G104 (4.3L Engine)

Engine harness, LH Rear of the cylinder head

Harness Routing Views in Wiring Systems

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G105 (4.3L Engine)

(CKT 450, CKT 451) Engine harness, LH Rear of the cylinder head

Harness Routing Views in Wiring Systems

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G117

(CKT 850) Body harness, to the LH rear of the engine compartment, near the cruise control module

Harness Routing Views in Wiring Systems

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G200

(CKT 1850) Body harness, to the LF of the IP, above P100

Harness Routing Views in Wiring Systems

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G201

(CKT 1850) Body harness, to the LF of the IP, above P100

Harness Routing Views in Wiring Systems

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G402 (Utility)

(CKT 22, CKT 1650) Chassis harness, in the rear of the LH frame rail

Harness Routing Views in Wiring Systems

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G402 (Pickup)

(CKT 1750) Chassis harness, near the top center of the second crossmember from rear, with the fuel filler neck ground strap

Harness Routing Views in Wiring Systems

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P100

IP bulkhead pass-through, LH rear of the engine compartment, on the cowl

Harness Routing Views in Wiring Systems

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S100 (4.3L Engine)

(CKT 452) Engine harness, between the breakouts for the starter and the generator, 4 cm (1.57 in) from the breakout to the generator

Harness Routing Views in Wiring Systems

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S101 (4.3L Engine

(Circuit  474) Engine harness, between the ICM and A/C Compressor Clutch Diode

Harness Routing Views in Wiring Systems

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S102 (4.3L Engine)

(CKT 470) Engine harness, 10 cm (3.9 in) before the breakout to CSFI, MAP sensor, and underhood fuse block connector C2

Harness Routing Views in Wiring Systems

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S103 (4.3L Engine w/ A/C)

(CKT 350) Engine harness, on the anode side of the A/C compressor clutch diode, in the breakout to the A/C compressor and cutoff switch

Harness Routing Views in Wiring Systems

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S104 (4.3L Engine w/ A/C)

(CKT 59) Engine harness, on the cathode side of the A/C compressor clutch diode, in the breakout to the A/C compressor and cutoff switch

Harness Routing Views in Wiring Systems

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S105 (4.3L Engine) (w/ California Emissions)

(CKT 78) AIR jumper, between G100 and the breakout to the engine harness, 5 cm (2 in) from the breakout to the engine harness

Harness Routing Views in Wiring Systems

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S106 (4.3L Engine)

(CKT 351) Engine harness, between the breakouts to the rear heated oxygen sensors connector and the body harness connector, 7 cm (2.6 in) from the breakout to the heated oxygen sensor connector

Harness Routing Views in Wiring Systems

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S113

(CKT 1020) Body harness, between the blower motor breakout and the blower motor relay breakout, 13 cm (5.12 in) from the breakout to the blower motor

Harness Routing Views in Wiring Systems

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S118 (4.3L Engine)

(CKT 850) Body harness, between the breakouts to the blower motor and the blower motor relay

Harness Routing Views in Wiring Systems

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S134

(CKT 850) Auto 4WD extension harness, in the breakout to the front VSS, 10 cm (3.9 in) into the breakout

Harness Routing Views in Wiring Systems

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S138

(CKT 420) Body harness, between the breakout to VCM connector C4 and the windshield wiper motor breakout, 32 cm (12.6 in) from the breakout to the motor

Harness Routing Views in Wiring Systems

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S140 (w/ A/T)

(CKT 450) Engine harness, on the engine harness at the A/T, 8 cm toward the engine from the breakout to the VSS

Harness Routing Views in Wiring Systems

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S140 (w/ M/T)

(CKT 450) Engine harness, on the engine harness breakout to the M/T VSS, 7 cm (2.6 in) from the breakout

Harness Routing Views in Wiring Systems

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S150 (4.3L Engine)

(CKT 539) Heated oxygen sensor (HO2S) harness, between the breakouts to the RF and the post-catalytic heated oxygen sensors (HO2S), 10 cm (3.9 in) from the breakout to the RH sensor

Harness Routing Views in Wiring Systems

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S151 (4.3L Engine)

(CKT 350) Heated oxygen sensor (HO2S) harness, 10 cm (3.93 in) from the breakout to the right front heated oxygen sensor (HO2S)

Harness Routing Views in Wiring Systems

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S152 (4.3L Engine)

(CKT 351, CKT 413, CKT 451) Engine harness, between the breakouts for the LH rear and RH rear engine block grounds, 15 cm (5.9 in) from the breakout to the LH rear engine grounds

Harness Routing Views in Wiring Systems

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S240 (Utility w/ Auto A/C)

(CKT 340) IP harness, 4 cm (1.6 in) from the breakout to the BCM module connector C3 and the breakout to the instrument cluster

Harness Routing Views in Wiring Systems

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Splice Pack SP200

(CKT 41, CKT 241, CKT 341, CKT 817) Strapped to the body harness, in the center front of the IP, to the RH of SP204

Harness Routing Views in Wiring Systems

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Splice Pack SP201

Body harness, to the LH of the IP, below the IP fuse block, taped to the Body Harness

Harness Routing Views in Wiring Systems

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Splice Pack SP202

(CKT 379, CKT 1850) Strapped to the body harness, at the LH center of the IP

Harness Routing Views in Wiring Systems

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Splice Pack SP422 (Pickup)

(CKT 510) Chassis harness, on the LH frame rail, behind the crossmember at the transmission

Harness Routing Views in Wiring Systems

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Splice Pack SP423 (Utility)

(CKT 470, CKT 1650, CKT 2109) Chassis harness, on top of the rear crossmember

Harness Routing Views in Wiring Systems

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