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Fail-Safe Chart

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. MALFUNCTION DETECTION 
    1. Operation when malfunction is detected
      FAIL-SAFE CHART

      Content Operation
      When thermistor trouble is detected Heater off
      When overheating (150°C (302°F)) of controller is detected Heater off
      When overvoltage (60 V) is detected Heater off
      When undervoltage (6 V) is detected Heater off
      OFF timer (30 mm) After preset time of timer passes, heater off
    2. Malfunction detection conditions
      1. When an open or short in the steering wheel's thermistor continues for 2 seconds or more.
      2. When the outer mirror switch's momentary switch is pressed continuously for 10 seconds or more.
    3. Malfunction display
      1. The LED of the outer mirror switch's heated steering wheel switch blinks at 0.3 second intervals.
    4. Restore condition
      1. If the normal condition is restored for 2 seconds or more, the previous operation before the malfunction occurred continues. However, regardless of if a malfunction is detected and the malfunction operation is occurring, and regardless of if the normal condition is restored and the system is operating normally, the timer will turn off the heater 30 minutes after the switch was first turned on.
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