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.

    A01IFPIN04

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

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A-1 (CCU) - Body ground LED output signal Engine switch on (IG), Steering heater switch on Below 3 V
      A-2 (CCV) - Body ground Steering heater switch input signal Engine switch on (IG), Steering heater switch pressed and held 11 to 14 V
      A-3 (CCX) - Body ground Ground Always Below 1 Ω
      A-4 (CCW) - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      B-1 (TH1) - Body ground Thermistor input signal Engine switch on (IG), Steering heater switch on at 0 to 40°C (32 to 104°F) 1.5 to 4.5 V*1
      B-2 (TH2) - Body ground Thermistor ground Engine switch on (IG), Steering heater switch on Below 1 V
      B-3 (SH2) - Body ground Heater output signal Engine switch on (IG), Steering heater switch on 11 to 14 V*2
      B-4 (SH1) - Body ground Heater ground Engine switch on (IG), Steering heater switch on Below 1 V

      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.