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

Transmission Component Location in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

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

In the automatic transmission

Transmission Component Location in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

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

In the automatic transmission

Transmission Component Location in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

A/C Compressor Clutch Coil

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

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

--

A/C Compressor Clutch Relay

In the Underhood Fuse Block

Power and Grounding Component Views in Wiring Systems

Electrical Center Identification Views in Wiring Systems

A/C Compressor Cycling Switch

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

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

Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch

In the Automatic Transmission

Transmission Component Location in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Battery Fuse

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

Engine Electrical Component Views in Engine Electrical

--

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

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

Camshaft Position (CMP) Sensor

Rear of the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Central Sequential Fuel Injection (CSFI) Connector

Top center of the engine, forward of the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Crankshaft Position (CKP) Sensor

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

--

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 Ignition Control Module (EICM)

Top RH of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Engine Coolant Temperature (ECT) Sensor

LH side of engine, at the spark plugs

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative (EVAP) Emission Canister Control Valve

Crossmember area of the fuel tan, rear center of the crossmember behind fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative (EVAP) Emission Canister Purge Solenoid Valve

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

Top front of the engine, near the drive belt

Engine Controls Component Views

Engine Controls Connector End Views

Four Wheel Drive Indicator Switch

At the front axle, RH of the differential

Transfer Case Control Component Views in Transfer Case-NP1

Transfer Case Control Connector End Views in Transfer Case-NP1

Fuel Injectors #1-6

Part of the Central Sequential Fuel Injection (CSFI)

Engine Controls Component Views

--

Fuel Pump and Sender

Internal to the fuel tank

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

--

Fuel Tank Pressure Sensor

The three wire connector at the top of the fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuse Holder

Engine compartment, to the right of the radiator

Power and Grounding Component Views in Wiring Systems

--

Generator

RF of the engine

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Heated Oxygen Sensor (HO2S) Bank 1, Sensor 1

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

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

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

Top of the engine, on the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Coil

Top RH of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Cluster

In the IP, ahead of the steering column

Power and Grounding 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

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 side door jamb switch, LF

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Knock Sensor

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

Top center of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF) Sensor

LF of the engine compartment, on the air intake duct

Engine Controls Component Views

Engine Controls Connector End Views

Park/Neutral Position and Backup Lamp Switch, Connector C1 (7 Cavities)

LH of the transmission

Shift Lock Control Component Views in Automatic Transmission

Shift Lock Control Connector End Views in Automatic Transmission

Park/Neutral Position and Backup Lamp Switch, Connector C2 (4 Cavities)

LH of the transmission

Shift Lock Control Component Views in Automatic Transmission

Shift Lock Control Connector End Views in Automatic Transmission

Pressure Control Solenoid (PC SOL) Valve

In the automatic transmission

Transmission Component Location in Automatic Transmission

Shift Lock Control Connector End Views in Automatic Transmission

Radio Connector C2, (10 Cavities)

Center of IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Secondary Air Injection Reactor (AIR) Fuse Block

Mounted to the RF fender next to the battery

Engine Controls Component Views

--

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

In the lower right front engine compartment area

Engine Controls Component Views

Engine Controls Connector End Views

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

In the lower right front engine compartment area

Engine Controls Component Views

Engine Controls Connector End Views

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

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

Transmission Component Location in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Torque Converter Clutch Solenoid (TCC SOL) Valve

In the automatic transmission

Transmission Component Location in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Transfer Case Shift Control Module

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

Transmission Component Location in Automatic Transmission

Automatic Transmission Internal Connector End Views in Automatic Transmission

Underhood Fuse Block

On the top of the left inner wheelwell

Power and Grounding Component Views in Wiring Systems

--

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)

RH of the engine compartment

Engine Controls Component Views

--

Vehicle Control Module (VCM) Connector C1 Blue (32 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Control Module (VCM) Connector C2 Red (32 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Control Module (VCM) Connector C3 Clear (32 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Control Module (VCM) Connector C4 (24 Cavities)

RH of the engine compartment

Engine Controls Component Views

VCM Connector End Views

Vehicle Speed Sensor (VSS) (w/ A/T)

RH rear of the A/T

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) (Bravada)

To RH rear of the auto 4WD transfer case

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) (w/ M/T)

To the left rear of the M/T

Engine Controls Component Views

Engine Controls Connector End Views

C100 (6 Cavities)

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)

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

Chassis to engine harness, LH top of the transmission

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

Inline Harness Connector End Views in Wiring Systems

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)

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 (w/ California Emissions)

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

Harness Routing Views in Wiring Systems

--

G102

Engine harness, RH rear of the cylinder head

Harness Routing Views in Wiring Systems

--

G103

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

Harness Routing Views in Wiring Systems

--

G104

Engine harness, LH Rear of the cylinder head

Harness Routing Views in Wiring Systems

--

G105

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

Harness Routing Views in Wiring Systems

--

G200

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

Harness Routing Views in Wiring Systems

--

G201

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

Harness Routing Views in Wiring Systems

--

G402

(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

--

P100

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

Harness Routing Views in Wiring Systems

--

S100

(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

--

S101

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

Harness Routing Views in Wiring Systems

--

S102

(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

--

S103 (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

--

S104 (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

--

S105 (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

--

S106

(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

--

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

--

S121 (NP1)

(CKT 1695) Body Harness, 6.5cm (2.6 in) from the breakout to the blower motor

Harness Routing Views in Wiring Systems

--

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

--

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

--

S140 (w/ A/T)

(CKT 450) Engine harness, on the engine harness at the A/T, 8 cm (3.2 in) toward the engine from the breakout to the VSS

Harness Routing Views in Wiring Systems

--

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

--

S150

(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

--

S151

(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

--

S152

(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

--

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

--

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

--

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

--

Splice Pack SP422

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

Harness Routing Views in Wiring Systems

--