ENGINE IMMOBILISER SYSTEM Security Indicator Light Does not Blink

DESCRIPTION


WIRING DIAGRAM

B001KPOE07

CAUTION / NOTICE / HINT

Note


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

  • Before replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SECURITY INDICATOR LIGHT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Entry&Start / Active Test.

    5. Perform the Active Test according to the display on the intelligent tester.

      Entry&Start (Certification ECU (Smart Key ECU Assembly))
      Tester Display Test Part Control Range Diagnostic Note
      Immobiliser Indicator Security indicator light ON/OFF

      The test is possible when the following conditions are met:


      • The key is in the cabin.

      • The power switch is on (IG).

    6. Enter the following menus: Body / Main Body / Active Test.

    7. Perform the Active Test according to the display on the intelligent tester.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Display Test Part Control Range Diagnostic Note
      Security Indicator Security indicator light ON/OFF -
      Result
      Result Proceed to
      Security indicator light operation is normal performing the "Main Body" and "Entry&Start" Active Test A

      • Security indicator light operation is not normal performing the "Entry&Start" Active Test

      • Security indicator light operation is normal performing the "Main Body" Active Test

      		 B

      • Security indicator light operation is normal performing the "Entry&Start" Active Test

      • Security indicator light operation is not normal performing the "Main Body" Active Test

      		 C
      Security indicator light operation is not normal performing the "Main Body" and "Entry&Start" Active Test D

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (SECURITY INDICATOR LIGHT - INSTRUMENT PANEL JUNCTION BLOCK) Click here

    D

    CHECK HARNESS AND CONNECTOR Click here

    B

  2. CHECK HARNESS AND CONNECTOR (SECURITY INDICATOR LIGHT - CERTIFICATION ECU)


    1. Disconnect the H72 indicator light connector.

    2. Disconnect the H1 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H1-2 (IND) - H72-16 (LP) Always Below 1 Ω
      H1-2 (IND) - Body ground Always 10 kΩ or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (SECURITY INDICATOR LIGHT - INSTRUMENT PANEL JUNCTION BLOCK)


    1. Disconnect the H72 indicator light connector.

    2. Disconnect the 2A junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-51 - H72-16 (LP) Always Below 1 Ω
      2A-51 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the main body ECU (multiplex network body ECU) Click here.

      B001KRUE03
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Disconnect the 2A junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-51 - MB-23 (IND) Always Below 1 Ω
      2A-51 - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H72 indicator light connector.

    2. Disconnect the H1 ECU connector.

    3. Disconnect the 2A junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H1-2 (IND) - H72-16 (LP) Always Below 1 Ω
      2A-51 - H72-16 (LP) Always Below 1 Ω
      H72-16 (LP) - Body ground Always 10 kΩ or higher
      H72-15 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H72-9 (M) - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE SECURITY INDICATOR LIGHT (COMBINATION SWITCH ASSEMBLY)


    1. Temporarily replace the security indicator light (combination switch assembly) with a new or known good one Click here.

    2. When the immobiliser is set (the power switch is off), check that the security indicator light blinks.

      OK
      Security indicator light blinks.

    OK

    END (SECURITY INDICATOR LIGHT WAS DEFECTIVE)

    NG

  7. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Temporarily replace the certification ECU (smart key ECU assembly) with a new or known good one.

    2. When the immobiliser is set (the power switch is off), check that the security indicator light blinks.

      OK
      Security indicator light blinks.

    OK

    END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

    NG

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