GM Service Manual Online
For 1990-2009 cars only

Headlamps

A rocker type switch controls the headlamps. The switch is located on the left side of the instrument panel. One switch position turns on the following lamps:

    • The parking lamps
    • The side marker lamps
    • The taillamps
    • The license plate lamp
    • The instrument panel lamps
    • The interior lamps

The second switch position turns on all of the above lamps plus the headlamps.

An instrument panel lamp dimmer control is provided in order to vary the intensity of the instrument panel lamps. Turn the control past the full bright detent in order to turn on the interior courtesy lamps.

The underhood lamp turns on when the following conditions are met:

    • The hood is raised
    • The parking or headlamp switch is on

Fog Lamp Switch

The fog lamp switch is located near the dimmer switch assembly. The following conditions must be met in order to turn on the fog lamps:

    • Place the ignition switch in the RUN position.
    • Place the fog lamp switch in the ON position.
    • Turn the park or low beams ON.

When the fog lamps are turned on (head or park lamps are on), the following lamps will also be on:

    • The front and rear marker lamps
    • The park lamps
    • The taillamps
    • The license lamp
    • The instrument panel lamps

When you select the high beam head lamps the fog lamps turn off.

Turn Signals

Directional signal lamps are combined with the parking lamps on the front of the vehicle. Turn the ignition switch ON to operate the directional signal lamps with the turn signal switch.

With the directional signal lever in the center position, stepping on the brake pedal illuminates both of the rear stoplamps. If the switch is operating on either side as a directional signal, stepping on the brake pedal turns on the stoplamp only on the side that is not flashing.

The flasher used in this circuit controls the directional signals and the hazard lamps. The flasher is located inside the instrument panel internal to the hazard switch.

The lane-change directional signal switch is standard equipment. When making a partial turn, such as changing lanes, the driver has the option of moving the switch lever to a detent stop. The signal lamps will continue to flash as long as the lever is held in this position. The signal lamps will cancel automatically when the lever is released. Use the detent position in order to signal a shallow turn or lane change without possibility of inadvertent cancel.

Moving the directional signal switch lever past the detent position to the limit of the lever's travel for either turn will provide conventional turn signal operation. The front sidemarker lamps will flash with the turn signal lamps when the parking lamps and the headlamps are off. When the parking lamps or the headlamps are on, the front sidemarker lamps will flash alternately with the turn signal lamps on the same side of the vehicle.

With the headlamp switch in the ON position, the multifunction (turn signal) lever also functions as the headlamp dimmer control. Performing the following steps will switch the headlamps to high beam or low beam:

    • Pushing the lever forward turns on the high beams.
    • Pulling the lever toward the driver turns on the low beams.
    • Pulling the lever toward the driver against the spring tension flashes the high beams.

Hazard Warning Flashers

A hazard warning flasher is standard on all vehicles. The switch control button is located on top of the steering column. Pushing the switch control button will disconnect the regular directional signal flasher and energize the hazard warning flasher. The hazard warning flasher will work with the ignition switch in any position. The turn signals will not work with the hazard flasher on. Pushing the switch again will cancel the hazard warning flasher.

When the hazard warning flasher is operating, the following components flash:

    • The directional signal indicator lights
    • All front turn signal lamps
    • All rear turn signal lamps
    • The front sidemarker lamps

If the brake pedal is depressed while the hazard warning flasher is operating, all of the stoplamps will illuminate. The other lamps will continue to flash.

Backup Lamps

The backup lamps are designed to operate under the following conditions:

    • With the ignition switch in the RUN position
    • With the transaxle in reverse

Placing the shift lever in REVERSE closes a switch located on the transaxle assembly to turn the backup lamps on.

Daytime Running Lamps

Daytime Running Lamps (DRL) are standard on all automobiles that are sold in Canada and the United States. The daytime running lamps improve the visibility of the vehicle when viewed from the front in daylight. The normal DRL system uses the low beam headlamps at a reduced voltage. A DRL resistor located in the engine compartment supplies the reduced voltage.

Applying the parking brake before turning the ignition switch to ON overrides the DRL feature. The DRL's are fully active and unaffected by any further operation of the parking brake under the following conditions:

    • With the ignition switch in the ON position
    • With the parking brake disengaged

A DRL indicator in the IP cluster alerts the driver to DRL system operation when the following conditions are present:

    • The ignition switch is in the ON position
    • The ambient light level is low (such as at dusk)