LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2009 >> ES 350 >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Smart Key System (Keyless Entry) (Diagnostics - Introduction)) >> Smart Key System >> Registration >> Registration
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Smart Key System: Registration: Registration

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. DESCRIPTION OF CODE REGISTRATION 

    HINT: 

    • ID codes are the same as recognition codes for the wireless transmitter and the engine immobilizer function. Registering an ID code enables the smart key system, the wireless door lock control function and the engine immobilizer function to be operated.
    • Code registration is needed when the certification ECU, ID code box, steering lock ECU or key is replaced with a new one.
    1. PROCEDURE "1"

      The vehicle with the smart key system does not have a key slot. Therefore, hold the key close to the engine switch to register the key, as shown in the illustration below.

      Fig 1: Identifying Communication Distance Between Engine Switch And Key
      GTY197696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. PART REPLACEMENT AND KEY REGISTRATION PROCEDURES 
    1. The following table shows ECU replacement and key registration procedures in case the malfunctioning ECU has been specified after troubleshooting the smart key system.

      HINT: 

      • The following procedures indicated in the table below require the use of Techstream:
        • New key ID registration
        • Additional key ID registration
        • Key ID erasure
        • All key ID erasure
        • ECU code registration
      • If all of the registered keys are not available, replacement of the ID code box is also required.
      • A maximum of 7 keys can be registered.
      Part to be replaced Condition Procedure Reference
      Certification ECU Customer has brought all keys 1. Replace certification ECU -
      2. Reregister all keys (new key ID registration) PROCEDURE "B"
      Some keys are lost Key ID codes can be registered and erased 1. Erase key codes (key ID erasure) PROCEDURE "D"
      2. Perform additional key registration procedure (additional key ID registration) PROCEDURE "C"
      3. Replace certification ECU -
      4. Reregister all keys (new key ID registration)
      HINT: 
      If some keys are not registered during above steps, they will be disabled because they cannot be registered later      		 PROCEDURE "B"
      Key ID codes cannot be either registered or erased 1. Replace certification ECU -
      2. Replace ID code box -
      3. Reregister all keys (new key ID registration)
      HINT: 
      If key codes cannot be erased or additional keys cannot be registered due to a malfunction in certification ECU, replace ID code box and certification ECU. If some keys are not registered during above steps, they will be disabled because they cannot be registered later      		 PROCEDURE "A"
      4. ECU communication ID registration PROCEDURE "G"
      All keys are lost 1. Replace certification ECU -
      2. Replace ID code box -
      3. Reregister all keys (new key ID registration)
      HINT: 
      If some keys are not registered during above steps, they will be disabled because they cannot be registered later      		 PROCEDURE "A"
      4. ECU communication ID registration PROCEDURE "G"
      ID code box At least 1 key is available 1. Replace ID code box -
      2. Register recognition codes in ECUs (ECU code registration) PROCEDURE "F"
      3. ECU communication ID registration PROCEDURE "G"
      All keys are lost 1. Replace ID code box -
      2. Replace certification ECU -
      3. Reregister all keys (new key ID registration)
      HINT: 
      If some keys are not registered during above steps, they will be disabled because they cannot be registered later      		 PROCEDURE "A"
      4. ECU communication ID registration PROCEDURE "G"
      Steering lock ECU Customer has brought at least 1 key 1. Replace steering lock ECU -
      2. Register recognition codes in ECUs (ECU code registration) PROCEDURE "F"
      All keys are lost 1. Replace steering lock ECU -
      2. Replace certification ECU -
      3. Replace ID code box -
      4. Reregister all keys (new key ID registration)
      HINT: 
      If some keys are not registered during above steps, they will be disabled because they cannot be registered later      		 PROCEDURE "A"
      5. ECU communication ID registration PROCEDURE "G"
      Power Source Control ECU No condition required Replace power source control ECU -
      ECM No condition required 1. Replace ECM -
      2. ECU communication ID registration PROCEDURE "G"
      Key Customer has brought at least 1 key 1. Using remaining key, erase lost key (key ID erasure) PROCEDURE "D"
      2. Register additional keys as necessary (additional key ID registration) PROCEDURE "C"
      All keys are lost 1. Erase all key codes (All key ID erasure) PROCEDURE "E"
      2. Register all keys (new key ID registration)
      HINT: 
      If the customer brings lost keys at a later date, they can be registered using the additional key ID registration function.      		 PROCEDURE "A"
  3. KEY REGISTRATION PROCEDURES 
    1. PROCEDURE "A"

      New key ID registration (when replacing certification ECU and ID code box, or certification ECU, ID code box and steering lock ECU)

      Process Procedure
      1. Start of registration 1. Connect Techstream to DLC3
      2. Turn engine switch on (IG)
      3. Select "Body Electrical / Smart Key / Utility / Smart Code Registration" from tester menu
      HINT: 
      The engine switch cannot be turned on (IG) more than 10 times. After connecting tester, turn tester on while turning driver side door courtesy light switch on and off repeatedly at 1.5 second intervals or less to continue key registration procedure
      2. Confirmation of ECU code Perform operation according to prompts on tester screen
      HINT: 
      The mode is automatically selected by tester, new registration mode or add more
      3. Verification of unregistered key *1 Hold unregistered key close to engine switch (For details, refer to PROCEDURE "1")
      Confirm that wireless door lock buzzer sounds. Place unregistered key on front passenger side seat
      Confirm that wireless door lock buzzer sounds
      4. Registration of ID code Perform operation according to prompts on tester screen
      5. End of registration Finish new key ID code registration

      *1: Repeat this process for each key which is to be registered for the vehicle. Finish the procedure for each key within 30 seconds. If the procedure for any of the keys has not been finished within the specified time, perform registration procedures from process 1 again. Make sure that only 1 key is in the cabin during registration procedures. If 2 or more keys are in the cabin simultaneously, electric waves will interfere with each other, preventing normal registration.

    2. PROCEDURE "B"

      New key ID registration (when replacing certification ECU)

      Process Procedure
      1. Start of registration 1. Connect Techstream to DLC3
      2. Turn engine switch on (IG)
      3. Select "Body Electrical / Smart Key / Utility / Smart Code Registration" from tester menu
      HINT: 
      The engine switch cannot be turned on (IG) more than 10 times. After connecting tester, turn tester on while turning driver side door courtesy light switch on and off repeatedly at 1.5 second intervals or less to continue key registration procedure
      2. Confirmation of ECU code Perform operation according to prompts on tester screen
      HINT: 
      The mode is automatically selected by tester, new registration mode or add mode
      3. Confirmation of all registered keys *1 Hold unregistered key close to engine switch (For details, refer to PROCEDURE "1")
      Confirm that wireless door lock buzzer sounds
      4. Confirmation of ECU code Perform operation according to prompts on tester screen
      5. Verification of unregistered key *2 Hold unregistered key close to engine switch (For details, refer to PROCEDURE "1")
      Confirm that wireless door lock buzzer sounds. Place unregistered key on front passenger side seat
      Confirm that wireless door lock buzzer sounds
      5. Registration of ID code Perform operation according to prompts on tester screen
      6. End of registration Finish new key ID code registration

      *1: Repeat this process for each key registered for the vehicle. Finish the procedure for each key within 30 seconds. If the procedure for any of the keys has not been finished within the specified time, perform registration procedures from process 1 again. If performing the key confirmation procedure for a key, the security indicator comes on and remains on until all the keys are confirmed.

      *2: Repeat this process for each key which is to be registered for the vehicle. Finish the procedure for each key within 30 seconds. If the procedure for any of the keys has not been finished within the specified time, perform registration procedures from 1 again. Make sure that only 1 key is in the cabin during registration procedures. If 2 or more keys are in the cabin simultaneously, electric waves will interfere with each other, preventing normal registration.

    3. PROCEDURE "C"

      Additional key ID registration

      Process Procedure
      1. Start of registration 1. Connect Techstream to DLC3
      2. Turn engine switch on (IG)
      3. Select "Body Electrical / Smart Key / Utility / Smart Code Registration" from tester menu
      2. Confirmation of registered key *1 Perform operation according to prompts on tester screen
      HINT: 
      The mode is automatically selected by tester, new registration mode or add mode
      Hold unregistered key close to engine switch (For details, refer to PROCEDURE "1")
      Confirm that wireless door lock buzzer sounds once
      3. Confirmation of ECU code Perform operation according to prompts on tester screen
      4. Verification of unregistered key *2 Hold unregistered key close to engine switch (For details, refer to PROCEDURE "1")
      Confirm that wireless door lock buzzer sounds. Place unregistered key on front passenger side seat
      Confirm that wireless door lock buzzer sounds
      5. Registration of ID code Perform operation according to prompts on tester screen
      6. End of registration Finish key ID code registration

      *1: Perform this process for one of the keys registered for the vehicle. Finish the procedure within 30 seconds. If the procedure has not been finished within the specified time, perform registration procedures from process 1 again.

      *2: Repeat this process for each key which is to be registered for the vehicle. Finish the procedure for each key within 30 seconds. If the procedure for any of the keys has not been finished within the specified time, perform registration procedures from 1 again. Make sure that only 1 key is in the cabin during registration procedures. If 2 or more keys are in the cabin simultaneously, electric waves will interfere with each other, preventing normal registration.

    4. PROCEDURE "D"

      Key ID erasure

      HINT: 

      Erase all registered key codes except one.

      Process Procedure
      1. Start of erasure 1. Connect Techstream to DLC3
      2. Turn engine switch on (IG)
      3. Select "Body Electrical / Smart Key / Utility / Smart Code Erasure" from tester menu
      2. Confirmation of registered key *1 Perform operation according to prompts on tester screen
      Hold unregistered key close to engine switch (For details, refer to PROCEDURE "1")
      Confirm that wireless door lock buzzer sounds once
      3. Confirmation of ECU code Perform operation according to prompts on tester screen
      4. Erasure of ID code Perform operation according to prompts on tester screen
      5. End of erasure Finish key ID code erasure

      *1: Perform this process for one of the keys registered for the vehicle. Finish the procedure within 30 seconds. If the procedure has not been finished within the specified time, perform erasure procedures from process 1 again.

    5. PROCEDURE "E"

      All key ID erasure

      HINT: 

      All the key codes registered in the vehicle are erased.

      Process Procedure
      1. Start of erasure 1. Connect Techstream to DLC3
      2. Turn Techstream on while turning driver side courtesy light switch on and off repeatedly at 1.5 second intervals or less
      3. Select "Body Electrical / Smart Key / Utility / Smart Code Reset" from tester menu
      4. Read the "Seed Number" of the tester screen and input into TIS
      5. Input the "Pass-Code Number" sent from TIS according to the tester screen
      3. Confirmation of ECU code Perform operation according to prompts on tester screen
      4. Erasure of all ID code Perform operation according to prompts on tester screen
      Wait for 15 minutes
      5. End of erasure Finish key ID code erasure
    6. PROCEDURE "F"

      ECU code registration

      Process Procedure
      1. Start of registration 1. Connect Techstream to DLC3
      2. Turn engine switch on (IG)
      3. Select "Body Electrical / Smart Key / Utility / ECU Communication ID Registration" from tester menu
      2. Confirmation of registered key *1 Hold unregistered key close to engine switch (For details, refer to PROCEDURE "1")
      Confirm that wireless door lock buzzer sounds once
      3. Erasure of ECU code Perform operation according to prompts on tester screen
      4. End of registration Finish ECU code registration

      *1: Perform this process for one of the keys registered for the vehicle. Finish the procedure within 30 seconds. If the procedure has not been finished within the specified time, perform erasure procedures from process 1 again.

    7. PROCEDURE "G"

      ECU communication ID registration

      NOTE:
      • The ECU COMMUNICATION ID should be registered when the ID code box and/or the ECM is replaced in order to match these ECM COMMUNICATION ID.
      • The engine cannot be started unless the ECM COMMUNICATION ID matches.

      Register the ECU communication ID.

      Fig 2: Locating DLC3 Connector End View Terminals Using SST
      GTY195587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using SST, connect terminals TC and CG of the DLC3.
        • SST: 09843-18040 
      2. Turn the engine switch on (IG) and leave it for 30 minutes.

        HINT: 

        Do not start the engine.

      3. Turn the engine switch off and disconnect terminals TC and CG.
      4. Check that the engine starts.
scientia non olet · About LEMON Manuals