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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Automatic Headlights >> System Operation Test

System Operation Test

  1. Turn ignition on. Turn light control switch to AUTO position. Gradually cover automatic light control sensor. Headlights and instrument cluster lights should illuminate. Gradually uncover automatic light control sensor. Lights should turn off.
  2. Gradually cover automatic light control sensor. Wait for lights to illuminate. Lights should turn off under any of the following conditions:
    • Light control switch is turned to OFF position.
    • Automatic light control sensor is exposed.
    • Ignition is turned off and driver's door is opened.
  3. Turn ignition off. Open driver's door (leave it open). Turn light control switch to AUTO position. Cover automatic light control sensor. Ensure lights illuminate when ignition is turned on.
  4. If operation is as specified, but complaint is headlight illumination is too early or too late, adjustment is required. See AUTOMATIC LIGHT CONTROL SENSOR  under ADJUSTMENTS. If system is inoperative or operation is abnormal, check system circuits and components. See CIRCUIT TESTS  and COMPONENT TESTS  .
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