Lonsdor K518 Pro Add 2025 Toyota BZ4X LT-20 Smart Key OK

This step-by-step guide explains how to successfully add a smart key to a 2025 Toyota BZ4X using the Lonsdor K518 Pro and an LT-20 Smart Key. Follow these instructions for a reliable and cost-effective key programming process.

 

Tools & Parts Needed

Lonsdor K518 Pro Key Programmer

Lonsdor LT-20-10 Smart Key

30-Pin Adapter Cable

Original Working Toyota Key

 

Step-by-Step Programming Guide

Step1. Key Generation with LT-20

Open K518 Pro, go to: Immo &Remote → Toyota → Key Settings → LT20 smart key → Covert smart key type

Place the new LT-20 key on the K518 Pro to generate.

 

By identifying working key → Place a working key into K518 Pro’s card slot.

Hold the original key close to the card slot and press the button to detect.

The tool should display two frequencies (e.g., 314.35/312.09MHz).

Always select the higher frequency first for better reliability.

 

Assign the key functions as follows:

Button 1: Lock

Button 2: Unlock

Button 3: Hatch/Trunk

Button 4: Panic

Button 5: AC (if supported)

 

Put LT20 smart key back to the K518 Pro’s cars slot to generate.

The process usually takes a few minutes.

 

Step2. Add Key to Vehicle

Go to Immo & Remote → Toyota → Select from vehicle → USA → BZ4X → Smart Key → PEPS(CAN) → Backuo Immo data

 

I’ve already backup the data, so select “Add Smart Key”.

Turn the ignition ON (do not start the engine).

Load the previously saved backup EEPROM data.

The tool will bypass the encode out code.

Follow the on-screen instructions until you hear two beeps.

 

Step3. Test the Key

Test all buttons, verify the key starts the vehicle.

A message like “A new key has been registered” confirms success.

 

Pro Tips

• Always back up EEPROM data before starting.
• Use the original key for frequency detection when possible.
• If the key fails, try upgrading the key via the tool.
• For difficult cases, use a third-party service to generate data.

 

Conclusion

Programming a smart key for 2025 Toyota BZ4X with the Lonsdor K518 Pro and LT-20 key is a straightforward process when following these steps. This method is both affordable and reliable, making it an excellent alternative to expensive OEM keys.

 

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