HEATED STEERING WHEEL SYSTEM FAIL-SAFE CHART


  1. DIAGNOSIS FUNCTION


    • Steering wheel heater control assembly has diagnosis function.

      Condition Detection Condition Response when malfunction detected Recovery Conditions
      ECU malfunction Internal malfunction detected in the steering wheel heater control assembly ECU reset Malfunctions cleared during reset
      Thermistor malfunction When an open circuit or short occurs in the thermistor inside the steering wheel assembly for 2 seconds or more Heater output off Normal condition of the thermistor is restored
      Heater OFF request signal received
      Heater malfunction Overcurrent protection or overheating protection operates Heater output off Heater OFF request signal received
      Lost communication Lost communication with air conditioning amplifier assembly continuously for 15 seconds Heater output off Normal communication continues for 10 seconds

  2. FAIL-SAFE FUNCTION

    Content Operation
    ECU malfunction Internal malfunction detected in the steering wheel heater control assembly ECU reset
    Heater malfunction Drive element overcurrent detection Heater output off
    Drive element overheat detection Heater output off
    Power source malfunction Low-voltage detection Heater output off
    Overvoltage detection Heater output off