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Inspection [09/2014 - ]: Procedure

  1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR 
    1. Disconnect the P1 automatic light control sensor connector.
      GTY514035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Automatic Light Control Sensor)
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      P1-1 (CLTB) - P1-2 (CLTE) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      P1-2 (CLTE) - Body ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the P1 automatic light control sensor connector.
      GTY505172Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Automatic Light Control Sensor)
    4. Connect an oscilloscope to the automatic light control sensor connector.
    5. Check the waveform.
      GTY442965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      Tester Connection Tool Setting Condition Specified Condition
      P1-4 (CLTS) - P1-2 (CLTE) 2 V/DIV., 10 ms./DIV. Engine switch on (IG), light control switch in AUTO position Correct waveform is as shown

      HINT: 

      The communication waveform changes according to the surrounding brightness.

      If the result is not as specified, the automatic light control sensor may be malfunctioning.

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