LIGHTING SYSTEM FAIL-SAFE CHART


  1. Automatic Light Control System (w/ Automatic Light Control System)

    If the main body ECU (multiplex network body ECU) detects a malfunction in the automatic light control sensor, the main body ECU (multiplex network body ECU) performs fail-safe control to prohibit automatic light control. If the low beam headlights and taillights are on, the lights will remain on until the headlight dimmer switch is turned off.

  2. HID Headlight System (for HID Headlight)

    The headlight light control ECU sub-assembly operates in fail-safe mode if an abnormal condition such as those listed below has been detected.

    Item Outline
    Detection of abnormal input voltage (High input voltage) If voltage that is input to the headlight light control ECU is approximately 20 V or higher, the ECU stops illuminating the headlights, and resumes when the voltage drops to 16 V or less.
    Detection of abnormal input voltage (Low input voltage) If voltage that is input to the headlight light control ECU is 6 V or less, the ECU stops illuminating the low beam headlights, and resumes when the voltage becomes 10 V or higher.

    Detection of abnormal output


    • Open in output side circuit

    • Short between output terminals

    • Short between output terminal and body ground

    		 If an abnormal condition occurs in the voltage that is output by the headlight light control ECU, the ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the headlight dimmer switch from off to the head position).
    Detection of abnormal light voltage (Low light voltage) Approximately 80 seconds after input voltage is supplied, if the light voltage is below approximately 31 V for approximately 0.5 seconds, the headlight light control ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the headlight dimmer switch from off to the head position).
    Detection of abnormal light voltage (High light voltage) If the light voltage is above approximately 69 V for approximately 0.5 seconds, the headlight light control ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the headlight dimmer switch from off to the head position).