HEATED STEERING WHEEL SYSTEM > SYSTEM DESCRIPTION

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HEATED STEERING WHEEL SYSTEM

  1. The heated steering wheel heats the steering wheel when the heated steering wheel switch on the outer mirror switch is operated.

  2. The heated steering wheel uses a thermistor inside of the steering wheel 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.


HEATER CONTROLLER SYSTEM


  1. Operation description


    C147022E05


    1. When the power switch is on (IG), pressing the steering wheel controller momentary switch on the outer mirror switch illuminates the LED and current is output from the steering controller to the heater of the heated steering wheel. Pressing the momentary switch again turns off the LED and stops the current from being output.

    2. A thermostat is installed in the steering wheel as a safety mechanism.

    3. The heated steering wheel switch LED will blink at 0.3 second intervals when either of the following occurs: 1) an open or short in the steering wheel thermistor continues for 2 seconds or more; or 2) the outer mirror switch momentary switch is pressed continuously for 10 seconds or more.

    4. 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 switch was first turned on.



  2. Signal input / output description


    C147023E01


    Signal
    		Signal Name
    		Function
    		Signal Type
    Input
    		Thermistor input
    		Input of voltage corresponding to heater temperature
    		Analog input
    Input
    		Temperature setting input
    		Input of voltage corresponding to temperature setting
    		Analog input
    Input
    		Operating switch input
    		Input of power circuit latch operation estimate signal
    		LOW / HI input
    Output
    		LED output
    		Output of LED
    		LOW / HI input
    Output
    		Heater output
    		Output of heater
    		LOW / HI input
    Output
    		Latch output
    		Power circuit maintenance
    		LOW / HI input

  3. Safety function

    Content
    		Operation
    When thermistor trouble 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