HEATED STEERING WHEEL SYSTEM TERMINALS OF ECU


  1. STEERING WHEEL HEATER CONTROL ASSEMBLY

    Tech Tips

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

    A01RAGJN01

    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 (integration control and panel assembly) input signal Engine switch on (IG), Steering heater switch (integration control and panel assembly) pressed and held

      11 to 14 V*1

      11 to 14 V 0.08 seconds after heater switch (integration control and panel assembly) is turned on then below 1 V *2
      A-2 (LED) - Body ground LED output signal Engine 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 Engine switch on (IG), Heated steering wheel system operating 11 to 14 V*3
      B-3 (TH1) - Body ground Thermistor input signal Engine switch on (IG), Heated steering wheel system operating on at 0 to 40°C (32 to 104°F) 2.5 to 4.8 V*4
      B-2 (TH2) - Body ground Thermistor ground Engine switch on (IG), Heated steering wheel system operating Below 1 V
      B-1 (SH2) - Body ground Heater ground Engine switch on (IG), Heated steering wheel system operating Below 1 V

      Tech Tips


      • *1: w/o Heated Windshield Defroster System

      • *2: w/ Heated Windshield Defroster System

      • *3: 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.

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