LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Main Body ECU (Multiplex Network Body ECU) Receives the light control switch signal and transmits a signal to the headlight relay.
    Headlight Dimmer Switch Assembly Light Control Switch Outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).
    Headlight Unit LH/RH Discharge Bulb The discharge bulb light shines ahead over a broader area and further forward, increasing the area visible to the driver.
    Light Control ECU Transforms battery voltage to a high voltage of up to 30000 V and applies it to the discharge bulbs in order to illuminate them.
    Headlight Relay Supplies power to the light control ECUs.

  2. FAIL-SAFE


    1. The light control ECU stops illuminating the HID headlights when any of the following abnormalities are detected.

      Condition Content
      Open in output side circuit

      • Stops illuminating the headlights.

      • Keeps the headlights off until the power is reinstated (by turning the light control switch from off to the head position).
      Short between output terminals

      • Stops illuminating the headlights.

      • Keeps the headlights off until the power is reinstated (by turning the light control switch from off to the head position).
      Leak between output terminal and body ground

      • Stops illuminating the headlights.

      • Keeps the headlights off until the power is reinstated (by turning the light control switch from off to the head position).
      Excessively low output voltage

      • Stops illuminating the headlights when the output voltage becomes too low (31 +/- 3 V or less).

      • Keeps the headlights off until the power is reinstated (by turning the light control switch from off to the head position).
      Excessively high output voltage

      • Stops illuminating the headlights when the output voltage becomes too high (69 +/- 4 V or more).

      • Keeps the headlights off until the power is reinstated (by turning the light control switch from off to the head position).
      Excessively high input voltage

      • Stops illuminating the headlights when the input voltage becomes too high (20 +/- 3 V or more).

      • Illuminates the headlights again when the voltage returns to the operating voltage range (10 to 16 V).
      Low input voltage

      • Stops illuminating the headlights when the input voltage becomes too low (below 6 V).

      • Illuminates the headlights again when the voltage returns to the operating voltage range (10 to 16 V).