LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Main Body ECU The main body ECU receives the HEAD position signal and transmits a signal to the light control ECU.
    Headlight Dimmer Switch Assembly Light Control Switch The light control switch transmits a HEAD position signal to the main body ECU.
    Headlight Unit Light Control ECU The light control ECU transforms battery voltage to a high voltage of up to 22000 V and applies it to the discharge bulbs in order to illuminate them.
    Discharge Bulb The discharge bulb light shines ahead over a broader area and further forward, increasing the area visible to the driver.

  2. FUNCTION


    1. The HID headlight system consists of discharge bulbs and a light control ECU.

    2. The light control ECU transforms the voltage that is input from the battery to a high voltage of up to 22000 V and applies it to the discharge bulbs in order to illuminate them.

    3. A fail-safe function is provided as a countermeasure against the high voltage generated when a problem occurs in the headlight system.

  3. FAIL-SAFE


    1. The light control ECU executes the fail-safe actions listed below in accordance with the problem that has been detected:

      Problem Outline
      Detection of Abnormal Input Voltage If the voltage input to the light control ECU deviates from the normal operating voltage (10 V to 16 V), the light control ECU stops illuminating the headlights. It resumes illuminating the headlights once the voltage reverts to the operating voltage range. However, if the input voltage decreases after the headlights have illuminated, the headlights will remain illuminated until the input voltage is insufficient to light the bulbs.
      Detection of Abnormal Output (Open Circuit or Short Circuit) If an abnormal condition (open or short) occurs in the voltage that is output by the light control ECU, the light control ECU stops illuminating the headlights and will maintain this state until the power is reinstated. Power is reinstated by turning the light control switch from off to on.
      Detection of Bulb Open If a bulb has not been inserted into the socket, the light control ECU stops producing a high voltage 1 second after the power has been turned on. The light control ECU will maintain this state until a bulb is correctly inserted and the power is reinstated by turning the light control switch from off to on.