AUTOMATIC LIGHT CONTROL SENSOR INSPECTION


  1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR


    1. A01NGRSE63

      Disconnect the H3 automatic light control sensor connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H3-6 (CLTB) - H3-3 (CLTE) Power switch off Below 1 V
      Power switch on (IG) 10 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      H3-3 (CLTE) - Body ground Always Below 1 Ω
      Text in Illustration
      *1

      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. A01NGLOE04

      Reconnect the H3 automatic light control sensor connector.

    4. Connect an oscilloscope to the automatic light control sensor connector.

      Text in Illustration
      *1

      Component with harness connected

      (Automatic Light Control Sensor)
    5. A01NHECE01

      Check the waveform.

      OK
      Tester Connection Tool Setting Condition Specified Condition
      H3-3 (CLTE) - H3-5 (CLTS) 5 V/DIV., 5 ms./DIV Power switch on (IG), light control switch in AUTO position Correct waveform is as shown

      Tech Tips

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

      If the result is not as specified, the automatic light control sensor may have a malfunction.