HEATED STEERING WHEEL SYSTEM DETAILS


  1. FUNCTION OF MAIN COMPONENTS


    1. The main components of the heated steering wheel system are as follows:

      Component Function
      Steering Heater Switch Used to switch the heated steering wheel system on and off.
      Steering Heater Switch Indicator Light Illuminates when the heated steering wheel system is on. When a malfunction is detected it flashes in order to warn the driver.
      Steering Wheel Assembly Steering Wheel Heater Control Assembly Calculates an appropriate amount of electric current for the heater wire and controls the current to the heater wire to obtain an appropriate steering wheel surface temperature.
      Thermistor Sends a steering wheel surface temperature signal to the steering wheel heater control assembly.
      Heater Wire Increases the steering wheel assembly surface temperature using power supplied by the steering wheel heater control assembly.
      Thermostat Stops current flow in the heater wire when the steering wheel surface temperature exceeds a threshold.
  2. SYSTEM CONTROL


    1. The heated steering wheel system has the following controls:

      Control Outline
      Basic Control The steering wheel heater control assembly receives the steering wheel surface temperature signal from the thermistor. Based on this signal, the amount of electric current to be sent to the heater wire is calculated to keep the steering wheel surface temperature at approximately 40°C (104 ° F).
      Overheat Protection Control The thermostat stops the current flow in the heater wire circuit when the temperature of the steering wheel surface temperature reaches approximately 55°C (131°F) in order to stop heating. Heating will resume when the steering wheel surface temperature decreases to approximately 40°C (104 ° F).
      Timer Control Shuts off the heated steering wheel system when 30 minutes elapse after the system is turned on using the steering heater switch.
  3. CONSTRUCTION


    1. Steering Wheel Assembly


      1. The heater portion of the steering wheel assembly consists of a thermistor, heater wire and thermostat. The heated portions of the wheel are wrapped with nonwoven cloth which includes the heater wire and covered with upholstery.

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        Text in Illustration
        *1 Steering Wheel Assembly *2 Heater Wire
        *3 Neoprene *4 Unwoven Cloth
        *5 Urethane - -
        *a A-A Cross Section - -
        A01GVI3 Heated Area - -