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Inspection [10/2014 - ]: Procedure

  1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR 
    1. Disconnect the D51 automatic light control sensor connector.
      GTY607950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D51-6 (CLTB) - D51-3 (CLTE) Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      D51-3 (CLTE) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Automatic Light Control Sensor)

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

    3. Reconnect the D51 automatic light control sensor connector.
      GTY547788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Connect an oscilloscope to the automatic light control sensor connector.
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Automatic Light Control Sensor)
    5. Check the waveform.
      GTY317699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      Tester Connection Tool Setting Condition Specified Condition
      D51-3 (CLTE) - D51-5 (CLTS) 5 V/DIV., 5 ms./DIV Power switch on (IG), light control switch in AUTO position Correct waveform is as shown

      HINT: 

      If the ambient light becomes brighter, width A becomes narrower.

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

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