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IG Signal Circuit: 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. According to the display on the Techstream, read the Data List.
      MAIN BODY

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG SW Ignition switch signal/
      OFF or ON      		 OFF: Ignition switch ACC or off
      ON: Ignition switch ON      		 -

      OK

      Normal conditions listed above are displayed.

    NG → See step   2 

    OK → See step   5 

  2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Disconnect the 3A and 3C instrument panel junction block assembly connectors.
      Fig 1: Measuring Voltage Of Instrument Panel Junction Block Assembly - Battery & Body Ground Harness & Connector
      GTY346619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      3A-1 - Body ground Always 11 to 14 V
      3C-23 - Body ground Ignition switch ON 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3C-10 - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Instrument Panel Junction Block Assembly)
    4. Reconnect the instrument panel junction block assembly connectors.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. REPLACE MAIN BODY ECU 
    1. Temporarily replace the main body ECU with a new or normally functioning one. Refer to REMOVAL .

    NEXT: Go to next step 

  4. 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. According to the display on the Techstream, read the Data List.
      MAIN BODY

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG SW Ignition switch signal/
      ON or OFF      		 ON: Ignition switch ON
      OFF: Ignition switch ACC or off      		 -

      OK

      Normal conditions listed above are displayed.

    NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    OK → END (MAIN BODY ECU DEFECTIVE) 

  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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