GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Ambient Light Sensor

On the top center of the instrument panel (IP) in the grille assembly

Lighting Systems Component Views

Lighting Systems Connector End Views

Ash Tray Lamp

Inside the top of the ash tray assembly

Lighting Systems Component Views

--

Automatic Day - Night Mirror w/Compass

On the top center of the windshield

Stationary Windows Component Views in Stationary Windows

Stationary Windows Connector End Views in Stationary Windows

Automatic Transfer Case (ATC) Select Switch

To the left of the instrument cluster above the headlamp switch on the IP

Transfer Case Control Component Views in Automatic Transfer Case

Transfer Case Control Connector End Views in Automatic Transfer Case

Back-up Lamp Switch (Auto) (Part of Park/Neutral Position Switch)

On the left side of the transmission

Lighting Systems Component Views

Lighting Systems Connector End Views

Back-up Lamp Switch (Manual)

On the left side of the transmission

Lighting Systems Component Views

Lighting Systems Connector End Views

Back-up Lamp, LH

Part of the left rear lamps

Lighting Systems Component Views

--

Back-up Lamp, RH

Part of the right rear lamps

Lighting Systems Component Views

--

Body Control Module (BCM)

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

Body Control System Component Views in Body Control System

Body Control System Connector End Views in Body Control System

Camper Harness Inline Connector

On the left frame rail rear towards the rear of the vehicle

Lighting Systems Component Views

Lighting Systems Connector End Views

Cargo Lamp Switch

To the right side of the steering column in the IP

Lighting Systems Component Views

Lighting Systems Connector End Views

Center High Mounted Stop/Cargo Lamp (Pickup)

On the center top rear of the cab

Lighting Systems Component Views

Lighting Systems Connector End Views

Clearance Lamp, LH

On the top of the cab on the left side

Lighting Systems Component Views

Lighting Systems Connector End Views

Clearance Lamp, RH

On the top of the cab on the right side

Lighting Systems Component Views

Lighting Systems Connector End Views

Courtesy Lamp Relay

In the mid bussed electrical center (MBEC)

Electrical Center Identification Views in Wiring Systems

--

Courtesy Lamp, LH

On the left lower dash to the left of the pedal assembly

Lighting Systems Component Views

--

Courtesy Lamp, RH

On the right lower dash below the IP compartment

Lighting Systems Component Views

--

Cruise Control Module

On the left front of the dash in the engine compartment

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Cruise Control Switch

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

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

Cruise Control Connector End Views in Wiring Systems

Daytime Running Lamp, LH

Below the left headlamp assembly

Lighting Systems Component Views

--

Daytime Running Lamp, RH

Below the right headlamp assembly

Lighting Systems Component Views

--

Daytime Running Lamps (DRL) Relay

in the UBEC

Electrical Center Identification Views in Wiring Systems

--

Dome Lamp

At the front center of the headliner

Lighting Systems Component Views

Lighting Systems Connector End Views

Dome/Reading Lamp

At the front center of the headliner

Lighting Systems Component Views

Lighting Systems Connector End Views

Door Courtesy Lamp, LH

On the left door trim panel

Lighting Systems Component Views

Lighting Systems Connector End Views

Door Courtesy Lamp, RH

On the right door trim panel

Lighting Systems Component Views

Lighting Systems Connector End Views

Fog Lamp Relay

In the UBEC

Electrical Center Identification Views in Wiring Systems

--

Fog Lamp Switch

To the right of the steering column on the IP

Lighting Systems Component Views

Lighting Systems Connector End Views

Fog Lamp, LH

On the left side of the front bumper

Lighting Systems Component Views

Lighting Systems Connector End Views

Fog Lamp, RH

On the right side of the front bumper

Lighting Systems Component Views

Lighting Systems Connector End Views

Front Marker Lamp, LH

On the left front of the vehicle

Lighting Systems Component Views

--

Front Marker Lamp, RH

On the right front of the vehicle

Lighting Systems Component Views

--

Front Park/Turn Lamp, LH

On the left front of the vehicle

Lighting Systems Component Views

--

Front Park/Turn Lamp, RH

On the right front of the vehicle

Lighting Systems Component Views

--

Headlamp & Panel Dimmer Switch

To the left of the steering wheel on the IP

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamp (AHL) Relay

In the UBEC

Electrical Center Identification Views in Wiring Systems

--

Headlamp Dimmer Switch

Inside the steering column, controlled by the multifunction switch

Lighting Systems Component Views

--

Heated Seat Switch, Driver

In the left door trim panel

Power Seat Component Views in Seats

--

Heated Seat Switch, Passenger

In the right door trim panel

Power Seat Component Views in Seats

--

High Beam Lamp, LH

On the left front of the vehicle

Lighting Systems Component Views

Lighting Systems Connector End Views

High Beam Lamp, RH

On the right front of the vehicle

Lighting Systems Component Views

Lighting Systems Connector End Views

HVAC Blower Switch (part of HVAC Control Module)

Under the radio in the center of the IP

HVAC Component Views in HVAC with A/C - Manual

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

Inadvert Power Relay

In the MBEC

Electrical Center Identification Views in Wiring Systems

--

Inflatable Restraint IP Module Switch

Near the center of the IP below the HVAC control module

SIR Component Views in SIR

SIR Connector End Views in SIR

Instrument Cluster

On the left side of the IP above 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

Instrument Panel Compartment Lamp

In the IP compartment

Lighting Systems Component Views

Lighting Systems Connector End Views

Left Bussed Electrical Center (LBEC)

On the lower left side of the IP

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

License Lamps

In the center of the rear bumper

Lighting Systems Component Views

--

Low Beam Lamp, LH

At the left front of the vehicle

Lighting Systems Component Views

Lighting Systems Connector End Views

Low Beam Lamp, RH

At the right front of the vehicle

Lighting Systems Component Views

Lighting Systems Connector End Views

Malfunction Indicator Lamp (MIL)

Part of the instrument cluster (IC)

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

Mid Bussed Electrical Center (MBEC)

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

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Mini Wedge (Door Jamb Switch), LH

Part of the left door latch assembly

Power Door Systems Component Views in Doors

Lighting Systems Connector End Views

Mini Wedge (Door Jamb Switch), RH

Part of the right door latch assembly

Power Door Systems Component Views in Doors

Lighting Systems Connector End Views

Power Door Lock Switch, LH

On the left door trim panel armrest

Power Door Systems Component Views in Doors

Power Door Systems Connector End Views in Doors

Power Door Lock Switch, RH

On the right door trim panel armrest

Power Door Systems Component Views in Doors

Power Door Systems Connector End Views in Doors

Power Window/Door Lock Switch, LH

On the left door trim panel armrest

Power Door Systems Component Views in Doors

Power Door Systems Connector End Views in Doors

Radio

In the center of the IP

Entertainment Component Views in Entertainment

Entertainment Connector End Views in Entertainment

Reading Lamps, Overhead Console

Part of the overhead console

Lighting Systems Component Views

Lighting Systems Connector End Views

Rear Lamps Bussing Block

In the front of the rear bumper on the crossmember

Lighting Systems Component Views

Lighting Systems Connector End Views

Roof Beacon Relay

Near the left lower B pillar

Electrical Center Identification Views in Wiring Systems

Lighting Systems Connector End Views

Roof Beacon Switch

At the center of the IP

Lighting Systems Component Views

Lighting Systems Connector End Views

Roof Marker Lamps

On top of the roof

Lighting Systems Component Views

Lighting Systems Connector End Views

Selectable Ride Switch

In the center of the instrument panel

Selectable Ride Component Views in Suspension

Selectable Ride Connector End Views inSuspension

Stoplamp Switch

At the top of the brake pedal

Hydraulic Brake Component Views in Hydraulic Brakes

Lighting Systems Connector End Views

Tail/Stop - Turn Lamp, RH

On the right rear of the vehicle

Lighting Systems Component Views

Lighting Systems Connector End Views

Tail/Stop-Turn Lamp, LH

On the left rear of the vehicle

Lighting Systems Component Views

Lighting Systems Connector End Views

Trailer Connector

At the rear of the vehicle at the rear bumper

Lighting Systems Component Views in Wiring Systems

Lighting Systems Connector End Views

Turn/Hazard Flasher

In the LBEC

Electrical Center Identification Views in Wiring Systems

Lighting Systems Connector End Views

Turn/Hazard Switch

Inside the steering column near the steering wheel

--

Lighting Systems Connector End Views

Underhood Bussed Electrical Center (UBEC)

At the left side of the engine compartment near the battery

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Underhood Lamp Assembly

On the underside of the hood

Lighting Systems Component Views

Lighting Systems Connector End Views

C125

At the left front of the engine compartment on the radiator support (Snowplow Package)

--

Inline Harness Connector End Views in Wiring Systems

C127

At the right front of the engine compartment on the radiator support (Snowplow Package)

--

Inline Harness Connector End Views in Wiring Systems

C198

On the left inner fender to the right of the UBEC

--

Inline Harness Connector End Views in Wiring Systems

C200

At the left kick panel next to the A pillar

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C201A

On the steering column under the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C201C

On the steering column under the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202

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

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C210

At the left A pillar near the kick panel

--

Inline Harness Connector End Views in Wiring Systems

C251

In the right side in back of the IP compartment box

--

Inline Harness Connector End Views in Wiring Systems

C297

On the lower right side of the IP

--

Inline Harness Connector End Views in Wiring Systems

C297B

On the lower right side of the IP

--

Inline Harness Connector End Views in Wiring Systems

C297D

On the lower right side of the IP

--

Inline Harness Connector End Views in Wiring Systems

C299

At the right side of the IP at the kick panel

--

Inline Harness Connector End Views in Wiring Systems

G100

On the left radiator support bracket

Power and Grounding Component Views in Wiring Systems

--

G102

On the right front of the engine block (4.3L)

--

--

G102

On the left front of the engine block (4.8L, 5.3L, 6.0L)

Power and Grounding Component Views in Wiring Systems

--

G200

On the right upper IP at the A pillar

Power and Grounding Component Views in Wiring Systems

--

G203

On the left upper IP at the A pillar

Harness Routing Views in Wiring Systems

--

G305

Inside the passenger compartment on the left side at the B pillar

--

--

G401

On the spare tire hoist bracket

--

--

P100

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

Power and Grounding Component Views in Wiring Systems

--

P500

Between the left front door and the body

Power and Grounding Component Views in Doors

--

P501

In the left door to the outside mirror

Power and Grounding Component Views in Wiring Systems

--

P600

Between the right front door and the body

Power and Grounding Component Views in Wiring Systems

--

Splice Pack 203 (SP203)

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

Harness Routing Views in Wiring Systems

--

S100

In the forward lamp harness

--

--

S101

In the forward lamp harness

--

--

S102

In the engine harness

--

--

S200

At the roof marker lamps

--

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