HEATED STEERING WHEEL SYSTEM FAIL-SAFE CHART


  1. MALFUNCTION DETECTION (w/o Steering Wheel Vibration)


    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 minutes) 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 (integration control and panel assembly) is pressed continuously for 10 seconds or more.

  2. MALFUNCTION DETECTION (w/ Steering Wheel Vibration)


    1. Operation when malfunction is detected

      Content Operation
      Heater failure Overcurrent detection of drive element Heater output off
      Overheating detection of drive element Heater output off
      Power failure Low-voltage detection Heater output off
      Over-voltage detection Heater output off
      Heater OFF timer 30 minutes after heated steering wheel system is turned on Heater output off

    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 is pressed continuously for 10 seconds or more.