HEATED STEERING WHEEL SYSTEM(w/ Pre-collision System) TERMINALS OF ECU


  1. STEERING VIBRATION AND HEATER ECU

    Tech Tips

    Perform the inspection from the harness side with the connectors connected.

    A0021S0N01

    1. Measure the voltage or resistance according to the value(s) in the table below.

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A-4 (IG) - Body ground IG power supply Power switch on (IG) 11 to 14 V
      A-3 (SW) - Body ground Steering heater switch (refreshing seat switch) input signal Power switch on (IG), Steering heater switch (refreshing seat switch) pressed and held 11 to 14 V
      A-2 (LED) - Body ground LED output signal Power switch on (IG), Heated steering wheel system operating Below 3 V
      A-1 (GND) - Body ground Ground Always Below 1 Ω
      B-5 (SH1) - Body ground Heater output signal Power switch on (IG), Heated steering wheel system operating 11 to 14 V*1
      B-3 (TH1) - Body ground Thermistor input signal Power switch on (IG), Heated steering wheel system operating on at 0 to 40°C (32 to 104°F) 2.5 to 4.8 V*2
      B-2 (TH2) - Body ground Thermistor ground Power switch on (IG), Heated steering wheel system operating Below 1 V
      B-1 (SH2) - Body ground Heater ground Power switch on (IG), Heated steering wheel system operating Below 1 V

      Tech Tips


      • *1: The current to the heater turns ON/OFF depending on the temperature of the thermistor. As a result, it may take several minutes before a voltage value is output.

      • *2: When ambient temperature is 0 to 40°C (32 to 104°F).