LIGHTING SYSTEM IG Signal Circuit

DESCRIPTION

This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU.

WIRING DIAGRAM

A01VHVGE01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG SW

      Ignition switch ON signal /

      OFF or ON

      OFF: Ignition switch ACC or off

      ON: Ignition switch ON

      		 -
      OK
      Normal conditions listed above are displayed.
      Result
      Result Proceed to
      OK A
      NG (w/ Stop and Start System) B
      NG (w/o Stop and Start System) C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY AND BODY GROUND) Click here

    B

  2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BACKUP BOOST CONVERTER)


    1. A01VLAZE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-40 - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK B

    A

    GO TO STOP AND START SYSTEM Click here

    B

    REPLACE MAIN BODY ECU Click here

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY AND BODY GROUND)

    A01VEYQE03
    Text in Illustration
    *A for LHD
    *B for RHD
    *a

    Front view of wire harness connector

    (to Instrument Panel Junction Block Assembly)

    1. for LHD


      1. Disconnect the 3E and 3B instrument panel junction block assembly connectors.

    2. for RHD


      1. Disconnect the 3F and 3B instrument panel junction block assembly connectors.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      3E-1 - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      3F-1 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-8 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU OR IGNITION SWITCH)

    A01VEK9E05
    Text in Illustration
    *a

    Component with harness connected

    (Instrument Panel Junction Block Assembly)

    1. Reconnect the instrument panel junction block assembly connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-29 - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-40 - 3A-54 Always Below 1 Ω
      3A-40 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE MAIN BODY ECU


    1. Temporarily replace the main body ECU with a new functioning one Click here.


    NEXT

  7. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG SW

      Ignition switch ON signal /

      OFF or ON

      OFF: Ignition switch ACC or off

      ON: Ignition switch ON

      		 -
      OK
      Normal conditions listed above are displayed.

    OK

    END (MAIN BODY ECU DEFECTIVE)

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY