This guide details the procedure for performing an all-keys-lost programming service on a 2023 Toyota BZ3 EV using KEYDIY KD-X4 key programmer.
Procedure
Step 1: Extract and Prepare the ECU Chip
Remove the target electronic control unit (ECU) from the vehicle.
Carefully desolder the octagonal chip from the ECU.
Solder this chip securely onto the appropriate adapter board.
Step 2: Read EEPROM Data
Enable OTG on your smartphone and connect the OTG cable.
Connect the adapter board (with the chip) and power on the KD-X4 device.
Launch the IMMO Programming app and select KD-X4/KD Prog Mini.
Navigate to Read File > Read EEPROM 95XXX Chip.
Select the chip type 95640 and execute the read command.
Once reading is successful, save the data file to your device.
Step 3: Reassemble Module and Program Key
Desolder the chip from the adapter board and reinstall it onto the original ECU.
Reinstall the ECU back into the vehicle.
In the IMMO Programming tool, go to Make Dealer Keys > Generate Emergency Key for Toyota > BZ3 Dealer Keys.
Select the data file saved in Step 2.
Begin the programming process and wait for the “Generate successfully” confirmation.
Step 4: Verify Key Functionality
Conduct a comprehensive test of the new key:
Remote Functions: Confirm that the lock and unlock commands operate correctly.
Start Function: Verify that the vehicle starts normally using the new key.
Conclusion
By following these steps, it’s easy to program 2023 Toyota BZ3 new key when all keys are lost using Keydiy KD-X4 5-in-1 key programmer.
