GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Corvette 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlight System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the headlamp switch to the ON position.
  2. Turn the headlamp dimmer switch to the LOW beam position.
    • The low beam headlamps are on.
    • The high beam headlamps are off.

Headlamps Inoperative - Low Beams

2
  1. Turn the headlamp dimmer switch to the HIGH beam position.
  2. Return the headlamp dimmer switch to the LOW beam position.
    • The high beam headlamps are on.
    • The high beam indicator is on.
    • The low beam headlamps are off.
    • Headlamps return to low beam operation.

3
  1. Turn the ignition switch to the OFF position.
  2. Turn the headlamp switch to the OFF position.
  3. Apply the parking brake.
  4. Start the engine.
  5. Transmission in park or neutral, release the parking brake.
  6. Automatic Headlamp Control option enabled (except Canada).
  7. Daylight conditions.
    • With the engine running and the parking brake on, the front turn signal lamps are off.
    • With the engine running, the parking brake released and daylight conditions the front turn signal lamps are on.

Daytime Running Lamps (DRL) Inoperative, Headlamp Switch Operates Normally

4

Cover the DRL/Automatic Headlamp Control, ambient light sensor.
    • After an approximate 30 second delay.
    • The turn signal lamps turn off.
    • The headlamps, parking lamps, and other lamps that come on with headlamps are on.

Daytime Running Lamps (DRL) Inoperative, Headlamp Switch Operates Normally

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.