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DTC B1244: Light Sensor Circuit Malfunction [12/2013 - ]: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Data List.
    5. Read the display on the Techstream.

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Light Sensor Illuminance Light control sensor illuminance 0 to 8191 lx Value is output according to ambient light level -

      Body Electrical > Main Body > Data List 

      Tester Display
      Light Sensor Illuminance

      OK

      Normal condition listed above is displayed.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2013 - ] 

    Result:  2

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - AUTOMATIC LIGHT CONTROL SENSOR) 
    1. Disconnect the G4 automatic light control sensor connector.
    2. Disconnect the F19 main body ECU (multiplex network body ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F19-21 (CLTE) - G4-2 (CLTE) Always Below 1 Ω
      F19-20 (CLTS) - G4-4 (CLTS) Always Below 1 Ω
      F19-19 (CLTB) - G4-1 (CLTB) Always Below 1 Ω
      F19-21 (CLTE) - Body ground Always 10 kΩ or higher
      F19-20 (CLTS) - Body ground Always 10 kΩ or higher
      F19-19 (CLTB) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  3

  3. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    1. Reconnect the F19 main body ECU (multiplex network body ECU) connector.
      GTY455525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Main Body ECU (Multiplex Network Body ECU))
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F19-19 (CLTB) - F19-21 (CLTE) Ignition switch off Below 1 V
      Ignition switch ON 10 to 14 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2013 - ] 

    Result:  1

    OK 

    See step  4

  4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR 
    1. Reconnect the G4 automatic light control sensor connector.
      GTY442702Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Automatic Light Control Sensor)
    2. Connect an oscilloscope to the automatic light control sensor connector.
    3. Check the waveform.
      GTY442965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      Tester Connection Tool Setting Condition Specified Condition
      G4-2 (CLTE) - G4-4 (CLTS) 2 V/DIV., 10 ms./DIV. Ignition switch ON, light control switch in AUTO position Correct waveform is as shown

      HINT: 

      The communication waveform changes according to the surrounding brightness.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2013 - ] 

    Result:  2

    NG 

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR. Refer to  REMOVAL [12/2013 - ] 

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