SMART ENTRY AND START SYSTEM(for Start Function) Additional Key cannot be Registered

DESCRIPTION

If additional registration is not possible, a malfunction of the electrical key transmitter sub-assembly, certification ECU (smart key ECU assembly), engine switch, No. 1 indoor electrical key antenna assembly (front floor), steering lock ECU (steering lock actuator or upper bracket assembly) or door control receiver is suspected.

CAUTION / NOTICE / HINT

Note


  • If registration of an electrical key transmitter sub-assembly cannot be performed, refer to Service Bulletin.

  • 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.

  • The smart entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Before replacing the certification ECU (smart key ECU assembly), steering lock ECU (steering lock actuator or upper bracket assembly) or electrical key transmitter sub-assembly, refer to Service Bulletin.

  • After repair, confirm that no DTCs are output.

Tech Tips

When additional registration is not possible, freeze frame data may be stored in the certification ECU (smart key ECU assembly).

If freeze frame data is available, it can be helpful in determining whether any parts were malfunctioning or not or narrowing down the suspected areas based on the table below.

Certification ECU Log of ID Code Registration
Parameter Name Cause of Problem and Countermeasure
Failed Registration Mode Make sure that another mode or a different registration mode is not selected, and then perform registration again.
Key Registration Max

Registration was not possible because the maximum number of the electrical key transmitter sub-assemblies has already been registered to the certification ECU (smart key ECU assembly).

If a new electrical key transmitter sub-assembly needs to be registered, such as when one of the registered electrical key transmitter sub-assemblies has been lost, erase an unnecessary ID code first.
Key Verification: Amp Abnormal Although a registered electrical key transmitter sub-assembly was held near the engine switch, electrical key transmitter sub-assembly registration could not be confirmed due to a malfunction of the immobiliser amplifier, such as a short to ground. DTC B278A or B2784 was stored.
Key Verification: Read Error

A registered electrical key transmitter sub-assembly was not held near the engine switch properly or electrical key transmitter sub-assembly registration cannot be confirmed due to wave interference, etc.

Register the electrical key transmitter sub-assembly using the correct procedure or use another registered electrical key transmitter sub-assembly.
Transponder Key Amp Abnormal Although an unregistered electrical key transmitter sub-assembly was held near the engine switch, electrical key transmitter sub-assembly registration cannot be completed due to a malfunction of the immobiliser amplifier, such as a short to ground. DTC B278A or B2784 was stored.
New Key Registration Error

An unregistered electrical key transmitter sub-assembly was not held near the engine switch properly or electrical key transmitter sub-assembly registration cannot be confirmed due to a malfunction, such as wave interference.

Reregister the electrical key transmitter sub-assembly using the correct procedure or use another registered electrical key transmitter sub-assembly.
New Key Vehicle ID Error

Although the vehicle ID stored in the certification ECU (smart key ECU assembly) should be registered to the electrical key transmitter sub-assembly during electrical key transmitter sub-assembly registration, it was not successful.

Use another unregistered electrical key transmitter sub-assembly for registration.
New Key Registration Failed Although an unregistered electrical key transmitter sub-assembly was held near the engine switch for registration, electrical key transmitter sub-assembly registration was not successful due to wave interference (such as radio waves emitted from a device in the cabin) or a low transmitter battery.
New Key Already Registered

As a registered electrical key transmitter sub-assembly was held near the engine switch by mistake, electrical key transmitter sub-assembly registration was not successful.

Using an unregistered electrical key transmitter sub-assembly, perform the registration procedure again.
New Key ID Code Error Replace the certification ECU (smart key ECU assembly).
New Key Information Abnormal

The ID code of an electrical key transmitter sub-assembly could not be registered to the certification ECU (smart key ECU assembly). If 2 electrical key transmitter sub-assemblies are held near the engine switch at the same time, incorrect registration information will be stored in the certification ECU (smart key ECU assembly), suspending registration.

Reregister the electrical key transmitter sub-assembly using the correct registration procedure.

Body Electrical > Entry&Start > Utility
Tester Display
Operation History

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes

      Note

      If a malfunction occurs, do not remove/install the vehicle battery before checking for DTCs.

      OK
      DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    OK

  2. READ VALUE USING GTS (UNMATCHED VEHICLE-ID)


    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 / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Entry&Start > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Unmatched Vehicle-ID Key No. (incorrect or correct) No or Yes

      No: Communication normal

      Yes: Communication malfunction

      The vehicle ID registered in the vehicle and the vehicle ID registered in the electrical key transmitter sub-assembly are different (if a key from another vehicle is brought into the vehicle exterior detection area while the doors are locked, "Yes" is displayed for "Unmatched Vehicle-ID" in the Data List).

      Other potential causes:


      • An electrical key transmitter sub-assembly from a different vehicle is being used.

      • A communication error due to wave interference.

      • The electrical key transmitter sub-assembly or certification ECU (smart key ECU assembly) is malfunctioning.

      Body Electrical > Entry&Start > Data List
      Tester Display
      Unmatched Vehicle-ID
      Result
      Result Proceed to
      "No" is displayed A
      "Yes" is displayed B

    B

    GO TO STEP 5 Click here

    A

  3. CHECK SMART ENTRY AND START SYSTEM (for Start Function)


    1. Remove the transmitter battery from the electrical key transmitter sub-assembly.

    2. B0070BSC01
      *1 Engine Switch
      *2 Electrical Key Transmitter Sub-assembly

      With the brake pedal depressed, hold the electrical key transmitter sub-assembly near the engine switch and check if the power source mode changes.

      OK
      The power source mode changes.

      Tech Tips

      If the power source mode changes, the cabin verification is malfunctioning.

      Result
      Result Proceed to
      The power source mode changes A
      The power source mode does not change B

    B

    GO TO SMART ENTRY AND START SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG and ACC)) Click here

    A

  4. CHECK STEERING LOCK FUNCTION


    1. The engine switch is on (ACC) or on (IG).

    2. Check that the steering unlocks.

      Tech Tips


      • When the engine switch is turned on (ACC) or on (IG) and the electrical key transmitter assembly and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.


      • Check that the communication between the steering lock ECU (steering lock actuator or upper bracket assembly) and certification ECU (smart key ECU assembly) is normal.

      OK
      The steering unlocks.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO SMART ENTRY AND START SYSTEM (for Start Function) (Unable to Unlock Steering Wheel (Engine cannot Start)) Click here

    OK

  5. REGISTRATION


    1. Using an unregistered electrical key transmitter sub-assembly, perform the additional registration procedure.

      Tech Tips

      Refer to Service Bulletin.

      OK
      Additional registration can be completed.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (FIRST REGISTERED KEY WAS DEFECTIVE)

    NG

  6. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.

      Tech Tips

      Refer to Service Bulletin.

      OK
      All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    GO TO OTHER PROBLEM (New Key cannot be Registered) Click here