AUTOMATIC LIGHT CONTROL SENSOR ON-VEHICLE INSPECTION

PROCEDURE


  1. CHECK RAIN SENSOR (w/ Rain Sensor)


    1. Check that the dimmer switch is set to auto.

    2. Cover the rain sensor with your hand and confirm that the headlights illuminate.

      OK
      Headlights illuminate.

  2. CHECK AUTOMATIC LIGHT CONTROL SENSOR (w/o Rain Sensor)


    1. Disconnect the automatic light control sensor connector.

    2. A002LNYE11
      Text in Illustration
      *a

      Front view of wire harness connector

      (Automatic Light Control Sensor)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (CLTE) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      1 (CLTB) - 2 (CLTE) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

      If the result not as specified, repair or replace the wire harness.

    3. Reconnect the automatic light control sensor connector.

    4. A002P90E12

      Connect an oscilloscope to the automatic light control sensor connector.

    5. A002QP6E01
      Text in Illustration
      *a

      Component with harness connected

      (Automatic Light Control Sensor)

      Check the waveform.

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

      Tech Tips

      The communication waveform changes according to the surrounding brightness.

      If the result is not as specified, replace the automatic light control sensor.