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IG Signal Circuit [06/2018 - ]: Procedure

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

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      IG SW Power switch on (IG) signal OFF or ON OFF: Power switch off
      ON: Power switch on (IG)      		 "OFF" is also displayed for this item when the power switch is on (ACC).

      Body Electrical > Main Body > Data List 

      Tester Display
      IG SW

      OK

      Normal conditions listed above are displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - ]  

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the 3K and 3D instrument panel junction block assembly connectors.
    2. Disconnect the G36 main body ECU (multiplex network body ECU) connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      3K-1 - Body ground Power switch off 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3D-3 - Body ground Always Below 1 Ω
      G36-19 (GND2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY796240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected (Instrument Panel Junction Block Assembly) - -
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      3K-1 - MB-32 (IG) Auxiliary battery not connected to 3A-17 and 3D-3 10 kΩ or higher
      3K-1 - MB-32 (IG) Auxiliary battery positive (+) → 3A-17
      Auxiliary battery negative (-) → 3D-3      		 Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

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