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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Access System (For Start) - Symptom Tests (2 Of 2) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) >> Immobiliser System does not Operate Properly [12/2017 - 10/2023] >> Procedure

Immobiliser System does not Operate Properly [12/2017 - 10/2023]: Procedure

  1. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical or Powertrain / Smart Access or Engine / Trouble Codes.
    5. Check for DTCs.

      Body Electrical > Smart Access > Trouble Codes 

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2017 - 10/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2020 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 10/2023] 

    Result: 

    A 

    See step  2

  2. CHECK WHETHER ENGINE STARTS 
    1. Check that the engine starts within 5 seconds of the engine switch being turned on (IG).

      OK

      Engine starts normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 09/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

    Result: 

    NG 

    See step  3

  3. CHECK ECM (TERMINAL EFII AND EFIO) 
    1. Using an oscilloscope, check the waveform.
      GTY777074Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (ID Code Box (Immobiliser Code ECU))      		 *b Approximately 160 ms.
      *c Approximately 270 ms. *d Approximately 40 ms.
      *e Approximately 60 ms. *f IMO Waveform
      *g IMI Waveform *h Waveform A
      *i Waveform B *j Waveform C
      *k Waveform A (detail) - -
      NOTE:

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      Measurement Condition

      Tester Connection Condition Tool Setting Specified Condition
      G58-3 (EFII) - Body ground Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery 2 V/DIV., 500 ms./DIV. Pulse generation
      (See waveform 2)
      G58-4 (EFIO) - Body ground Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery 2 V/DIV., 500 ms./DIV. Pulse generation
      (See waveform 1 and 3)

      Result

      Result Proceed to
      Normal waveform A
      Waveform A is not output, or has abnormal wavelength or shape B
      Waveform B is not output, or has abnormal wavelength or shape C
      Waveform C is not output, or has abnormal wavelength or shape D

    Result: 

    B 

    See step  6

    Result: 

    C 

    REPLACE ECM. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    D 

    See step  7

    Result: 

    A 

    See step  4

  4. REGISTER ECU COMMUNICATION ID (ID CODE BOX (IMMOBILISER CODE ECU) - ECM) 
    1. Register the ECU communication ID codes.

      HINT: 

      Refer to Registration.

      Refer to REGISTRATION [12/2017 - 10/2020] , or refer to REGISTRATION [10/2020 - 10/2022] , or refer to REGISTRATION [10/2022 - 10/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK WHETHER ENGINE STARTS 
    1. Check that the engine starts.

      OK

      Engine starts normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (COMMUNICATION ID WAS NOT REGISTERED) 

    Result: 

    NG 

    See step  7

  6. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM) 
    1. Disconnect the G58 ID code box (immobiliser code ECU) connector.
    2. Disconnect the A95 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G58-3 (EFII) - A95-37 (IMO) Always Below 1 Ω
      G58-4 (EFIO) - A95-38 (IMI) Always Below 1 Ω
      G58-3 (EFII) or A95-37 (IMO) - Other terminals and body ground Always 10 kΩ or higher
      G58-4 (EFIO) or A95-38 (IMI) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  7

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. REPLACE ID CODE BOX (IMMOBILISER CODE ECU) 
    1. Replace the ID code box (immobiliser code ECU) with a new one.

      Refer to REMOVAL [12/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. REGISTER RECOGNITION CODE 
    1. Register the recognition codes to the ECUs.

      HINT: 

      Refer to Registration.

      Refer to REGISTRATION [12/2017 - 10/2020] , or refer to REGISTRATION [10/2020 - 10/2022] , or refer to REGISTRATION [10/2022 - 10/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. REGISTER ECU COMMUNICATION ID 
    1. Register the ECU communication ID codes.

      HINT: 

      Refer to Registration.

      Refer to REGISTRATION [12/2017 - 10/2020] , or refer to REGISTRATION [10/2020 - 10/2022] , or refer to REGISTRATION [10/2022 - 10/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. CHECK WHETHER ENGINE STARTS 
    1. Check that the engine starts.

      OK

      Engine starts normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE) 

    Result: 

    NG 

    GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - ] 

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