Heated Steering Wheel System Fail-Safe Chart

  1. MALFUNCTION DETECTION

Heated Steering Wheel System -- Fail-Safe Chart



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.