HEATED STEERING WHEEL SYSTEM TERMINALS OF ECU


  1. CHECK STEERING VIBRATION AND HEATER ECU

    A01WS79E01

    Tech Tips

    Inspect the connectors from the back side while the connectors are connected.


    1. Measure the voltage and 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 Engine switch on (IG) 11 to 14 V
      A-3 (SW) - Body ground Heated steering wheel switch input signal Engine switch on (IG), steering heater switch pressed and held 11 to 14 V
      A-1 (GND) - Body ground Ground Always Below 1 Ω
      B-5 (SH1) - Body ground Heater output signal Engine switch on (IG), steering heater switch on 11 to 14 V*1
      B-3 (TH1) - Body ground Thermistor input signal Engine switch on (IG), steering heater switch on 2.5 to 4.8 V*2
      B-2 (TH2) - Body ground Thermistor ground Engine switch on (IG), steering heater switch on Below 1 V
      B-1 SH2) - Body ground Heater ground Engine switch on (IG), steering heater switch on 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).