GM Service Manual Online
For 1990-2009 cars only

Headlamps

The headlamps consist of two interchangeable single filament bulbs which provide high and low beams; the inner bulb in the headlamp is the high beam and the outer bulb is the low beam.

Headlamp Switch

The headlamp switch is located on the right hand of the steering column. The headlamp switch includes controls for the park lamps and headlamps.

Ambient Light Sensor

The ambient light sensor is located on the left side of the defroster grille. It is a variable resistor that changes as the light level through the windshield changes. Daylight or nighttime conditions is determined by the value of the ambient light sensor. If an object is covering the ambient light sensor, the vehicle may act as if nighttime conditions exist even though it is daytime.

Fog Lamp Switch

The fog lamp switch is located to the right of the instrument cluster. The fog lamp switch includes controls for the fog lamps and interior dimming.

Front Fog Lamps

The front fog lamps consist of two clear bulbs. Each is located below the front bumper fascia. The front fog lamps provide additional lighting during foggy driving conditions.

Rear Fog Lamps

The rear fog lamps consist of two red bulbs. Each is located in the rear compartment lid lamp assembly. The rear fog lamps provide additional rear lighting during foggy driving conditions.

Front Park/Side Marker/Turn/Cornering Lamps

The front park, side marker, turn signal, cornering lamp are all an integral part of the headlamp assembly. The side marker lamp is amber in color and contain reflectors to alert approaching vehicles for nighttime driving safety. The cornering lamp is clear and lights the peripheral turn area of the vehicle.

Tail Lamps

The tail, stop, and turn signal functions are performed by the quarter mounted tail lamps and rear compartment lid assembly tail lamps. The quarter mounted tail lamp consists of a red lens, a tail/stop lamp bulb, and a turn lamp. The vehicle does not have separate rear side marker lamps. The quarter mounted tail lamp wraps around the corner of the vehicle and serves as the rear side marker function. The lower portion of the lamp contains reflectors to alert approaching vehicles for driving nighttime safety. The rear compartment lid lamp assembly consists of four tail lamp bulbs, two backup lamp bulbs, and two license lamp bulbs.

Center High Mounted Stop Lamp (CHMSL)

The center high mounted stop lamp (CHMSL) is located along the rear compartment lid. It operates simultaneously with the rear stop lamps and provides increased visibility of vehicle braking.

License Lamps

The license lamps consist of two clear bulbs. They are located in the rear compartment lid lamp assembly. The license lamps illuminate the license plate of the vehicle when the park lamps are on.

Repeater Lamps

The repeater lamps are located in the front fender. They are used as additional turn signal lamps.

Position Lamps

The position lamps are located in the headlamp assembly. They are used as additional park lamps.

Hazard Lamps

The hazard switch is located in the instrument panel center. The hazard function uses all LH and RH turn lamps.

Stoplamp/BTSI Switch

The stoplamp/BTSI switch is located under the instrument panel, near the top of the brake pedal.

Backup Lamps

The backup lamps are white, located in the rear compartment lid lamp assembly. They provide rear lighting and alert other when in reverse.

Reading Lamps

There are three reading lamps located in the overhead console and two reading lamps located in the rear of the headliner. Each reading lamp has a switch, which is used to turn the reading lamp on and off.

Courtesy Lamps

Courtesy lamps are located in the driver foot well and passenger foot well. There is also a courtesy lamp located in each door. The reading lamps are also used as courtesy lamps. Courtesy lamps are used to illuminate the vehicle during nighttime conditions. The courtesy lamps are divided into front and rear. The front courtesy lamps include the front foot well lamps, all door courtesy lamps, and the reading lamps in the overhead console. The rear courtesy lamps include the rear reading lamps in the headliner. They can also be manually turned on or off using the interior lamp switch.

Interior Lamp Switch

The interior lamp switch is located in the overhead console. It is used to control the courtesy lamps.

Underhood Lamp

The underhood lamp is located in the engine compartment, on the LH rear of the hood.

Rear Compartment Lamp

The rear compartment lamp is located in front center of the rear compartment.

Vanity Lamps

The vanity lamps are located in the center of each sunshade.

IP Compartment Lamp

The IP compartment lamp is located in IP compartment on the LH side of the instrument panel.

Ignition Key Cylinder Lamp

The ignition key cylinder lamp is located in the instrument panel to the right of the steering column. It aids the driver in locating the ignition switch to insert their key.

Interior Lamps Dimming

The instrument cluster (IPC), radio, cellular telephone, and heater and A/C control head all have vacuum fluorescent (VF) displays, if equipped. The incandescent lamps include the ashtray lamp, rear blower switch, PRNDL lamp, traction control switch, four heated seat switches, steering wheel controls, two driver information center (DIC) switches, release switch assembly, headlamp switch, radio, heater and A/C control head, four power window switches, four power door lock switches, and memory function switch, if equipped. The incandescent lamps and VF displays can be dimmed to change the amount of light inside the vehicle.