THEFT DETERRENT SYSTEM Ignition Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) determines the ignition switch position (LOCK, ACC, ON) based on signals from the IG or ACC circuit.

WIRING DIAGRAM

A002AGBE02

CAUTION / NOTICE / HINT

Note


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

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    Click here


    • *: for LHD

PROCEDURE


  1. READ VALUE USING GTS (ACC SW, IG SW)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      ACC SW Ignition switch ON or OFF

      ON: Ignition switch ACC

      OFF: Ignition switch LOCK

      		 -
      IG SW Ignition switch ON or OFF

      ON: Ignition switch ON

      OFF: Ignition switch LOCK or ACC

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      ACC SW
      IG SW
      OK
      ON or OFF appears on the screen according to whether the ignition switch is in ON or is in LOCK or ACC.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY


    1. Remove the ignition or starter switch assembly.

      for 1AR-FE: Click here

      for 2GR-FE: Click here

    2. Inspect the ignition or starter switch assembly.

      for 1AR-FE: Click here

      for 2GR-FE: Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY for 1AR-FE: Click here
    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY for 2GR-FE: Click here

    OK

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


    1. Disconnect the 4K instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      4K-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the 4A 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
      4A-27 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F50-8 (IG1) - 4A-16 Always Below 1 Ω
      F50-8 (IG1) or 4A-16 - Body ground Always 10 kΩ or higher
      F50-7 (ACC) - 4A-28 Always Below 1 Ω
      F50-7 (ACC) or 4A-28 - Body ground Always 10 kΩ or higher
      F50-5 (AM1) - 4A-33 Always Below 1 Ω
      F50-5 (AM1) or 4A-33 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Temporarily replace the instrument panel junction block assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK THEFT DETERRENT SYSTEM


    1. Check the active arming mode function.

      Click here

      OK
      The active arming mode function operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here