IMMOBILISER SYSTEM(w/ Smart Entry and Start System) Security Indicator Light Does not Blink

DESCRIPTION


WIRING DIAGRAM

A0027KUE05
*1 Security Indicator Light (Clock Assembly)
*2 Certification ECU (Smart Key ECU Assembly)
*3 Main Body ECU (Multiplex Network Body ECU)
*4 CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • The immobiliser system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the immobiliser system after confirming that the communication systems are functioning properly.

    Click here

  • 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. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes
      Powertrain > Engine and ECT > Trouble Codes
      Powertrain > Engine > Trouble Codes
      OK
      DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS (IMMOBILISER INDICATOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Entry&Start > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Immobiliser Indicator Security indicator light OFF/ON -

      Body Electrical > Entry&Start > Active Test
      Tester Display
      Immobiliser Indicator
      OK
      The security indicator light (clock assembly) operates normally.
      Result
      Result Proceed to
      OK (w/ Theft Deterrent System) A
      OK (w/o Theft Deterrent System) B
      NG C

    B

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    C

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SECURITY INDICATOR LIGHT (CLOCK ASSEMBLY) - BODY GROUND) Click here

    A

  3. CHECK SECURITY INDICATOR LIGHT (CLOCK ASSEMBLY) OPERATION


    1. When the immobiliser is set, check that the security indicator light (clock assembly) blinks.*1

      OK
      The security indicator light (clock assembly) blinks normally.

    2. When the theft deterrent system is in the arming preparation state, check that the security indicator light (clock assembly) illuminates.*2

      OK
      The security indicator light (clock assembly) illuminates normally.
      Result
      Result Proceed to
      *1 is NG (*2 is OK) A
      *2 is NG (*1 is OK) B

    A

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B

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

  4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SECURITY INDICATOR LIGHT (CLOCK ASSEMBLY) - BODY GROUND)


    1. Disconnect the F13 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the G7 security indicator light (clock assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F13-19 (IND) - G7-9 (LP) Always Below 1 Ω
      F13-19 (IND) or G7-9 (LP) - Body ground Always 10 kΩ or higher
      G7-8 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the F13 certification ECU (smart key ECU assembly) connector.

    2. Reconnect the G7 security indicator light (clock assembly) connector.

    3. Using an oscilloscope, check the waveform.

      A0028D9C16
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Measurement Condition
      Tester Connection Condition Specified Condition
      F13-19 (IND) - Body ground Engine switch off → on (IG) Pulse generation → Below 2 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SECURITY INDICATOR LIGHT (CLOCK ASSEMBLY)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)