AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM FAIL-SAFE CHART

  1. Automatic Headlight Beam Level Control System

    1. The headlight leveling ECU operates in fail-safe mode if an abnormal condition such as those listed below has been detected.

      Item

      Abnormality Detection Condition

      Return Condition

      Warning Light

      Height control sensor power source voltage

      Abnormal height control sensor power source voltage (4.6 V or less, or 6.25 V or more) is detected.

      Voltage of 4.61 to 6.24 V is detected

      Illuminated

      Height control sensor signal voltage

      Abnormal height control sensor signal voltage (0.25 V or less, or 4.75 V or more) is detected.

      Voltage of 0.26 to 4.74 V is detected

      High power source voltage

      Abnormal high power source voltage (18.5 V or more) is detected.

      Voltage of 17.5 V or less is detected

      Not illuminated

      Low power source voltage

      Abnormal low power source voltage (9.0 V or less) is detected.

      Voltage of 9.3 V or more is detected

      Not illuminated

      Abnormal height control sensor signal while initialization

      Initialization is performed outside the valid range of the voltage for initialization.

      Initialization is successfully completed within the valid range of the voltage for initialization.

      Illuminated