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System Description [11/2017 - ]

  1. HEATED STEERING WHEEL SYSTEM 
    1. The heated steering wheel system heats the steering wheel assembly when the steering heater switch (refreshing seat switch) is operated.
    2. The heated steering wheel system uses a thermistor inside of the steering wheel assembly to detect the heater temperature and maintain the set temperature.
    3. The heated steering wheel timer function turns off the heater after a predetermined period of time.
  2. HEATER CONTROLLER SYSTEM 
    1. Operation description
      GTY452219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. When the engine switch is on (IG), pressing the steering heater switch (refreshing seat switch) operates the heated steering wheel system. When the heated steering wheel system is operating, the steering vibration and heater ECU illuminates the indicator LED and sends current to the steering wheel heater unit of the heated steering wheel system. Pressing the steering heater switch (refreshing seat switch) again stops operation of the heated steering wheel system.
      2. A thermostat is installed in the steering wheel heater unit as a safety mechanism.
      3. The steering heater switch (refreshing seat switch) LED turns off when either of the following occurs:
        • An open or short in the steering wheel heater unit thermistor continues for 2 seconds or more.
        • The steering heater switch (refreshing seat switch) is pressed continuously for 10 seconds or more.
      4. The timer will turn off the heater 30 minutes after the steering heater switch (refreshing seat switch) was first turned on.
    2. Signal input / output description
      GTY675727Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Signal Signal Name Function
      Input Thermistor input Input of voltage corresponding to heater temperature
      Input Operating switch input Input of power circuit operation estimate signal
      Output LED output Output of LED
      Output Drive current output Output of drive current
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