HEATED STEERING WHEEL SYSTEM FAIL-SAFE CHART


  1. MALFUNCTION DETECTION


    1. Operation when malfunction is detected

      Content Operation
      When thermistor malfunction is detected Heater off
      When overheating (175°C (347°F)) of controller is detected Heater off
      When load short current (50 A or more) is detected Heater off
      When undervoltage (4.5 V) is detected Heater off
      OFF timer (30 min.) After preset time of timer passes, heater off
      Reverse voltage protection Protection circuit operates

    2. Malfunction detection conditions


      1. When an open or short in the steering wheel heater unit thermistor continues for 2 seconds or more.

      2. When the steering heater switch (combination switch assembly) is pressed continuously for 10 seconds or more.

    3. Malfunction display


      1. The LED of the steering heater switch (combination switch assembly) 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 steering heater switch (combination switch assembly) was first turned on.