GM Service Manual Online
For 1990-2009 cars only

Headlamps

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

    • The parking lamps
    • The side marker lamps
    • The taillamps
    • The licence plate lamp
    • The IP lamps
    • The interior lamps

The second switch position turns ON the headlamps in addition to all of the above lamps.

An IP lamp dimmer control is provided in order to vary the intensity of the IP lamps. Turn the control past the full bright detent in order to turn ON the courtesy lamps.

The under hood lamp is designed to turn ON under the following conditions:

    • When the hood is raised
    • When the parking or headlamp switch is ON

Fog Lamp Switch (Chevrolet Z-24)

The fog lamp switch is located in the dimmer switch assembly. The fog lamps will turn ON if the following conditions exist:

    • The ignition switch is in the RUN position.
    • The fog lamp switch is in the ON position with the high beams OFF.

The following components must be ON when the fog lamps are turned ON (with the headlamps and the park lamps turned OFF):

    • The front marker lamp
    • The rear marker lamp
    • The park lamps
    • The tail lamps
    • The license lamp
    • The instrument panel lamps

The fog lamps turn OFF when the high beam head lamps are selected.

Turn Signals

The directional signal lamps are combined with the parking lamps on the front of the vehicle. The ignition lamp switch must be ON in order to operate the directional signal lamps with the turn signal switch. Stepping on the brake pedal will illuminate the rear stop lamps on both sides when the directional signal lever is in the center position. If the switch operates either side as a directional signal, stepping on the brake pedal will turn ON the stop lamp only on the side that is not flashing. The flasher that is used in this circuit controls only the directional signals. The flasher is located in the instrument panel near the steering column.

The lane-change directional signal switch is standard equipment. When making a partial turn, such as when 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 remains in this position. The signal lamps will cancel flashing automatically when the lever is released. Using the detent position allows the driver to signal a shallow turn or lane change without the possibility of the signal failing to 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 side marker lamps will flash with turn signal lamps under the following conditions:

    • When the park lamps are OFF
    • When the headlamps are OFF

When the parking lamps or the headlamps are ON, the front side marker lamps will flash alternately with the turn signal lamps on the same side of the vehicle.

The multi-function (turn signal) lever functions also as the headlamp dimmer control with the headlamp switch in the ON position. The following steps will switch the headlamps to high or low beam:

  1. Pull the lever toward yourself until you hear a click.
  2. Release the lever.

Hazard Warning Flashers

A HAZARD WARNING flasher is standard on all vehicles. Pushing the switch control button to the right (on top of the steering column) will enable the following actions:

    • Disconnect the regular directional signal flasher.
    • 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 to the left will cancel the hazard warning flasher.

When the hazard warning flasher operates the directional signal lights all of the front and the rear turn signal lamps will flash. The front side marker lamps will also flash. If the brake pedal is depressed while the hazard warning flasher operates, the center high mounted stop lamp illuminates while the other lamps continue to flash.

Back-Up Lamps

The back-up lamps operate when both of the following conditions are met:

  1. The ignition switch is in the RUN position.
  2. The transaxle is in the REVERSE position.

Placing the shift lever in the REVERSE position closes a switch located on the transaxle assembly. Closing the switch turns the back-up 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 utilizes high beam headlamps at reduced voltage. A DRL control module located in the engine compartment supplies the reduced voltage.

Applying the parking brake before turning the ignition switch to the ON position overrides the DRL feature.

The DRL's display the following conditions when the ignition switch is in the ON position and the parking brake is in the OFF position:

    • Fully active
    • Unaffected by any further operation of the park brake

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

    • The ignition is in the ON position.
    • The parking brake is disengaged.