HEATED STEERING WHEEL SYSTEM FAIL-SAFE CHART


  1. MALFUNCTION DETECTION


    1. Operation when malfunction is detected

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

    2. Malfunction detection conditions


      1. An open or short in the steering wheel thermistor continues for 2 seconds or more.

      2. The steering heater switch is pressed continuously for 10 seconds or more.

    3. Malfunction display


      1. The LED of the steering heater switch turns off.

    4. Restore condition


      1. If the system returns to normal 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, or if the system returns to normal, the timer will turn off the heater 30 minutes after the switch was first turned on.