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.

    B000V4KE06

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

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      z15-1 (GND) - Body ground Ground Always Below 1 Ω
      z15-3 (LIN) - Body ground LIN communication signal Engine switch on (IG) Pulse generation
      z15-4 (IG) - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      z24-1 (SH1) - Body ground Heater output signal Engine switch on (IG), Heated steering wheel system operating Below 1 V
      z24-2 (TH1) - Body ground Thermistor input signal Engine switch on (IG), Heated steering wheel system operating 11 to 14 V*1
      z24-3 (TH2) - Body ground Thermistor ground Engine switch on (IG), Heated steering wheel system operating 2.5 to 4.8 V*2
      z24-4 (SH3) - Body ground Heater ground Engine switch on (IG), Heated steering wheel system operating Below 1 V
      z24-5 (SH2) - Body ground Heater ground Engine 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).