HEATED STEERING WHEEL SYSTEM TERMINALS OF ECU


  1. STEERING WHEEL HEATER CONTROL ASSEMBLY (w/o Steering Wheel Vibration)

    Tech Tips

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

    B002ID8E06

    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 Power switch on (IG), steering heater switch on Below 3 V
      A-2 (CCV) - Body ground Steering heater switch input signal Power 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 Power switch on (IG) 11 to 14 V
      B-1 (TH1) - Body ground Thermistor input signal Power switch on (IG), steering heater switch on 1.5 to 4.5 V*1
      B-2 (TH2) - Body ground Thermistor ground Power switch on (IG), steering heater switch on Below 1 V
      B-3 (SH2) - Body ground Heater output signal Power switch on (IG), steering heater switch on 11 to 14 V*2
      B-4 (SH1) - Body ground Heater ground Power 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.

  2. STEERING HEATER AND VIBRATION ECU (w/ Steering Wheel Vibration)

    Tech Tips

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

    B002KJ6E05

    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 input signal Power switch on (IG), steering heater 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 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).