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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Lighting (Exterior)) >> Lighting System >> DTC B1244: Light Sensor Circuit Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Body / Data List.
    5. Read the display on the Techstream.

      Body (Main Body ECU RH) 

      DATA LIST - BODY (MAIN BODY ECU RH)

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination Rate Info Illumination information / 0 to 99 99 ms 0 8 to 22 ms -
    6. The value of the illumination rate should change in the following range when light shines on the automatic light control sensor or when the automatic light control sensor is covered.

      OK: 0.8 to 22 ms. 

      HINT:

      This is the time taken for the automatic light control sensor to generate one cycle of frequency according to the brightness.

    NG: Go to step 2 

    OK: REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - AUTOMATIC LIGHT CONTROL SENSOR) 
    1. Disconnect the J74 main body ECU RH connector.
    2. Disconnect the K1 automatic light control sensor connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      J74-6 (CLTB) - K1-6 (CLTB) Always Below 1 Ω
      J74-5 (CLTS) - K1-5 (CLTS) Always Below 1 Ω
      J74-4 (CLTE) - K1-3 (CLTE) Always Below 1 Ω
      J74-6 (CLTB) - Body ground Always 10 kΩ or higher
      J74-5 (CLTS) - Body ground Always 10 kΩ or higher
      J74-4 (CLTE) - Body ground Always 10 kΩ or higher
    4. Connect the 2 connectors.
      5. Fig 1: Identifying J74 Main Body ECU Rh Connector
      G05756391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  3. CHECK AUTOMATIC LIGHT CONTROL SENSOR 
    1. Disconnect the automatic light control sensor.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      K1-3 (CLTE) - Body ground Always Below 1 Ω
    3. Connect a voltmeter's positive (+) lead to terminal 6 and a negative (-) lead to terminal 3.
    4. Measure the voltage according to the value (s) in the table below.
      Fig 2: Identifying Automatic Light Control Sensor Connector Terminal
      G05756392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      K1-3 (CLTE) - K1-6 (CLTB) Engine switch on (IG) 11 to 14 V
    5. Connect the K1 automatic light control sensor connector.
    6. Connect the oscilloscope and check the waveform according to the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition Tester Range
      K1-3 (CLTE) - K1-5 (CLTS) Engine switch on (IG), Light control switch in AUTO Correct waveform is as shown in the illustration S V/Division, 5 msec/Division
      Fig 3: Identifying Oscilloscope Waveform
      G05320282Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    NG: REPLACE AUTOMATIC LIGHT CONTROL SENSOR  (See AUTOMATIC LIGHT CONTROL SENSOR  )

    OK: REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 

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