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DTC B1244: Light Sensor Circuit Malfunction: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn Techstream on.
    4. Select the following menu items: Body Electrical / Main Body / Data List.
    5. Read the display on Techstream.
      MAIN BODY:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination Rate Illumination rate information / 0 ms to 99.99 ms Value is output according to ambient light levels -

      OK

      Normal condition listed above is displayed.

    OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    NG: Go to next step 

  2. CHECK VEHICLE CONDITION 

    Result

    Vehicle Condition Proceed to
    Manual Air Conditioning System A
    Automatic Air Conditioning System B

    B → See step   6 

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) 
    1. Disconnect the E11 automatic light control sensor connector.
      Fig 1: View Of Main Body ECU & Automatic Light Control Sensor Connector Terminals
      GTY178620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E6 main body ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E6-18 (CLTE) - E11-5 (CLTE) Always Below 1 Ω
      E6-19 (CLTS) - E11-4 (CLTS) Always Below 1 Ω
      E6-20 (CLTB) - E11-3 (CLTB) Always Below 1 Ω
      E6-18 (CLTE) - Body ground Always 10 kΩ or higher
      E6-19 (CLTS) - Body ground Always 10 kΩ or higher
      E6-20 (CLTB) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Reconnect the main body ECU connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Fig 2: Identifying E11 Connector
      GTY292557Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      E11-3 (CLTB) - E11-5 (CLTE) Ignition switch off Below 1 V
      Ignition switch on (IG) 10 to 14 V

      Standard resistance

      Tester Connection Condition Specified Condition
      E11-5 (CLTE) - Body ground Always Below 1 Ω

    NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    OK: Go to next step 

  5. INSPECT AUTOMATIC LIGHT CONTROL SENSOR 
    1. Reconnect the automatic light control sensor connector.
      Fig 3: Identifying E11 Connector
      GTY293787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect an oscilloscope to the automatic light control sensor connector.
    3. Check the waveform.
      Fig 4: Identifying Waveform Graph
      GTY123970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      Tester Connection Tool Setting Condition Specified Condition
      E11-5 (CLTE) - E11-4 (CLTS) 5 V/DIV., 5 ms./DIV. Ignition switch on (IG), light control switch in AUTO Correct waveform is as shown

      HINT: 

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

    NG → REPLACE AUTOMATIC LIGHT CONTROL SENSOR 

    OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) 
    1. Disconnect the E11 automatic light control sensor connector.
      Fig 5: Identifying E11 Automatic Light Control Sensor Connector And E6 Main Body ECU Connector Terminal
      GTY206480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E6 main body ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E6-18 (CLTE) - E11-3 (CLTE) Always Below 1 Ω
      E6-19 (CLTS) - E11-5 (CLTS) Always Below 1 Ω
      E6-20 (CLTB) - E11-6 (CLTB) Always Below 1 Ω
      E6-18 (CLTE) - Body ground Always 10 kΩ or higher
      E6-19 (CLTS) - Body ground Always 10 kΩ or higher
      E6-20 (CLTB) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Reconnect the main body ECU connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Fig 6: Identifying E11 Automatic Light Control Sensor Connector Terminal
      GTY196004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      E11-6 (CLTB) - E11-3 (CLTE) Ignition switch off Below 1 V
      E11-6 (CLTB) - E11-3 (CLTE) Ignition switch on (IG) 10 to 14 V

      Standard resistance

      Tester Connection Condition Specified Condition
      E11-3 (CLTE) - Body ground Always Below 1 Ω

    NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    OK: Go to next step 

  8. INSPECT AUTOMATIC LIGHT CONTROL SENSOR 
    1. Reconnect the automatic light control sensor connector.
      Fig 7: Identifying Automatic Light Control Sensor Connector Terminal
      GTY188226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect an oscilloscope to the automatic light control sensor connector.
    3. Check the waveform.
      Fig 8: Identifying Waveform Graph
      GTY123970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      Tester Connection Tool Setting Condition Specified Condition
      E11-3 (CLTE) - E11-5 (CLTS) 5 V/DIV., 5 ms./DIV. Ignition switch on (IG), light control switch in AUTO Correct waveform is as shown

      HINT: 

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

    NG → REPLACE AUTOMATIC LIGHT CONTROL SENSOR 

    OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

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