GM Service Manual Online
For 1990-2009 cars only

Exterior Lamps

The exterior lighting system includes the following components:

    • The headlamps
    • The daytime running lamps
    • The rear combination lamps
    • The licence plate lamps
    • The front parking/turn signal lamps
    • The high mounted stop lamp

Headlamps

The headlamps are controlled by the headlamp switch located on the turn signal switch. Turn the end of the turn signal switch lever to the first position in order to turn on the parking/turn signal lamps. Turn the end of the of the turn signal switch lever to the second position in order to turn on the headlamps. The high-beam headlamp operation is controlled using the turn signal switch lever on the steering column. In order to change headlamp operation from low-beam to high-beam (or high-beam to low-beam), push the turn signal switch lever toward the instrument panel (until the detent is felt) and release. In order to change headlamp operation back to low-beam operation, pull the turn signal switch lever toward the driver (until the detent is felt) and release. The high-beam indicator (blue) in the instrument cluster will light during high-beam headlamp operation. A solid tone will sound as a reminder if you open the drivers door with the key out of the ignition and the headlamps on.

Daytime Running Lamps (DRL)

Daytime running lamps (DRL) are standard equipment on all models. Operating through the low beams at 80 percent intensity of the normal output, the DRL system operates under the following conditions:

    • The engine is running.
    • The light switch is in either the OFF or the park lamp position.
    • The parking brake is not applied.

Once the parking brake is released and then reapplied, the DRL will remain operational under the following conditions:

    • The engine is running.
    • The light switch is in either the OFF or the park lamp position.

Front Parking/Turn Signal Lamps

The front parking/turn signal lamps are located next to the headlamp assembly. The parking/turn signal lamp lens is clear over the parking lamp and amber over the turn signal lamp. It contains one amber double filament bulb. Operation of the parking lamps can be accomplished by turning the end of the turn signal switch to the first detent position. When a turn is signaled, the appropriate front parking lamp flashes to signal a turn. The turn signals operate only with the ignition switch in the RUN position and will not operate during hazard flasher operation.

Tail Lamps

The tail lamps are located on the vehicle body at each side of the rear compartment lid. Each tail lamp consists of the following single filament bulbs:

    • The side marker bulb
    • The backup bulb
    • The turn signal bulb

Each of the tail lamps also contains a double filament tail lamp bulb.

The tail lamp lens is multi colored. A red lens covers the tail lamp and the side marker lamp, an amber lens covers the turn signal lamp and a clear lens covers the backup lamp. The tail lamp filament lights under the following conditions:

    • The stoplamp switch is closed (By pressing the brake pedal).
    • The parking lamps are activated.
    • The headlamps are activated.

The turn signal lamp bulbs are lit during turn signal operation.

Backup Lamps

The backup lamps are designed to operate with the ignition in the ON position. Placing the transaxle in the R position closes the backup lamp circuit and turns the backup lamps on. On vehicles equipped with a manual transaxle, the circuit closes through the backup lamp switch. On vehicles equipped with an automatic transaxle, the circuit closes through the park neutral position (PNP) switch.

High-Mounted Stoplamp

The high-mounted stoplamp contains 1 bulb and is located in the center of the rear seat back to window trim panel. The stop lamp is designed to operate in conjunction with the tail lamps whenever the brake pedal is depressed.

License Plate Lamps

There are two rear license plate lamps located in the rear bumper fascia directly over the license plate. Each rear license plate lamp contains one clear, single filament bulb. The rear license plate bulbs will light when either the parking lamps or headlamps are activated.

Interior Lamps

The interior lighting system includes the following components:

    • The ashtray illumination lamp
    • The cigar lighter illumination lamp
    • The dome lamp
    • The map lamp

The Ashtray Illumination Lamp

The ashtray illumination lamp lights whenever the parking lamps or the headlamps are activated. Refer to Ashtray Lamp Replacement for the ashtray illumination lamp removal and installation procedures.

The Cigar Lighter Illumination Lamp

The cigar lighter illumination lamp lights whenever the parking lamps or headlamps are activated. The cigar lighter illumination lamp bulb socket is attached to the cigar lighter. Refer to Cigar Lighter Housing Replacement in Instrument Panel, Gauges and Console for cigar lighter removal and installation procedures.

The Dome Lamp

The dome lamp is located in the center of the headliner. The dome lamp consists of a clear lens, the dome lamp bulb and a three position slide switch. The slide switch has the following three detent positions:

    • OFF
    • DOOR
    • ON

When the switch is in the OFF position, the dome lamp will not light. When the dome lamp switch is in the DOOR position, the lamp will light when any door is open (the door jamb switch is closed). The lamp will remain on until all of the doors are closed. When the dome lamp switch is in the ON position, the dome lamp will light.

The Map Lamp

On vehicles equipped with a power sunroof, a map lamp is incorporated into the power sunroof switch. The map lamp consists of the following components:

    • The map lamp bulb
    • A clear lens
    • A two position push switch

Pushing the switch in turns the map lamp on. Pushing the switch a second time turns the map lamp off.