HEATED STEERING WHEEL SYSTEM TERMINALS OF ECU


  1. STEERING VIBRATION AND HEATER ECU

    Tech Tips

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

    A01W45LE03

    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 Engine switch on (IG) 11 to 14 V
      A-3 (SW) - Body ground Steering heater switch (combination switch assembly) input signal Engine switch on (IG), Steering heater switch (combination switch assembly) pressed and held 11 to 14 V
      A-2 (LED) - Body ground LED output signal Engine switch on (IG), Steering heater switch (combination switch assembly) on Below 3 V
      A-1 (GND) - Body ground Ground Always Below 1 Ω
      B-1 (SH2) - Body ground Heater ground Engine switch on (IG), Steering heater switch (combination switch assembly) on Below 1 V
      B-3 (TH1) - Body ground Thermistor input signal Engine switch on (IG), Steering heater switch (combination switch assembly) on at 0 to 40°C (32 to 104°F) 2.5 to 4.8 V*1
      B-2 (TH2) - Body ground Thermistor ground Engine switch on (IG), Steering heater switch (combination switch assembly) on Below 1 V
      B-5 (SH1) - Body ground Heater output signal Engine switch on (IG), Steering heater switch (combination switch assembly) on 11 to 14 V*2

    Tech Tips


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

    • *2: 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.