THEFT DETERRENT SYSTEM Ignition Switch Circuit

DTC Code DTC Name
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

B332808E01

CAUTION / NOTICE / HINT

Note:

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

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. According to the display on the GTS, read the Data List.

      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. B332797C02

      *a

      Component without harness connected

      (Ignition or Starter Switch Assembly)

      *b

      LOCK

      *c

      ACC

      *d

      ON

      *e

      START

      Remove the ignition or starter switch assembly.

      for 1ZR-FAE:Click here

      for 8NR-FTS:Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      5 - 7

      Ignition switch ACC

      Below 1 Ω

      5 - 8

      Ignition switch ON

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

    for 1ZR-FAE:Click here

    for 8NR-FTS:Click here

    OK

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

    1. Disconnect the 3B 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

      3B-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 3C 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

      3C-9 - 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 STATER SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    1. Disconnect the 3D 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

      E4-8 (IG1) - 3D-24

      Always

      Below 1 Ω

      E4-8 (IG1) - Body ground

      Always

      10 kΩ or higher

      3D-24 - Body ground

      Always

      10 kΩ or higher

      E4-7 (ACC) - 3D-25

      Always

      Below 1 Ω

      E4-7 (ACC) - Body ground

      Always

      10 kΩ or higher

      3D-25 - Body ground

      Always

      10 kΩ or higher

      E4-5 (AM1) - 3D-48

      Always

      Below 1 Ω

      E4-5 (AM1) - Body ground

      Always

      10 kΩ or higher

      3D-48 - 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. Replace the instrument panel junction block assembly.

      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