LIGHTING SYSTEM FAIL-SAFE CHART

  1. HID HEADLIGHT SYSTEM

    1. Headlight Light Control ECU Sub-assembly

      1. The headlight light control ECU sub-assembly 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).

  2. 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 the automatic light control. If the low beam headlights and taillights are on, the lights will remain on until the light control switch is turned off.