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Fail-Safe Chart

  1. FAIL-SAFE 
    1. Light control ECU

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

      FAIL-SAFE CHART

      Item Outline
      Detection of Abnormal Input Voltage
      • If voltage that is input to light control ECU deviates from operating voltage (9 to 16 V), ECU stops illuminating headlights, and resumes illuminating headlight when voltage reverts to operating voltage range
      • However, if input voltage decreases after headlights have illuminated, headlight will remain illuminated until bulbs are extinguished
      Detection of Abnormal Output (open or short circuit) or Flashing Bulb If abnormal condition (open or short circuit) occurs in voltage that is output by light control ECU, or if bulb flashes, ECU stops illuminating headlights and will maintain this state until power is reinstated (by turning headlight control switch from ON or OFF)
      Detection of Bulb Open If bulb is not inserted in its socket, ECU stops generating high voltage until bulb is inserted correctly and power is reinstated by turning headlight control switch from OFF to ON or turning power switch from OFF to ON (IG)
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