As titled, here we will show how to program a spare 8A B8 smart key for 2025- 2026 Toyota/Lexus using Keydiy devices.
Model example: 2026 Lexus ES200.
Same procedure applies to other 8A B8 models.
Tools required:
Procedure:
Step 1: Generate TIB remote
Open TIB remote shell and insert a battery.
Connect OBD extension cable with KD-X6 and connect the other end to the OBD main cable.
Connect the OBD main cable to the vehicle’s OBD connector.
Go to Remote Function-Smart Match- Smart Match (Toyota 4D/8A).

Place the original key in the device’s sensing area.
Follow the prompts to collect original key data.

The detected result is Lexus B8. Frequency is 433.58/434.42MHz
Generate the program with KD TIB smart remote.
Choose Wireless Generation.
Put the KD TIB remote into the induction coil, press OK and proceed to the next step.
Press remote control any button to generate.
Generated TIB remote successfully.

Step 2: Back up immo data
Return to Home page.
Select Programming function- Immo Programming- Lexus- Smart Key System.
Back up EEPROM data for Smart box.

Connect the Keydiy Toyota 30-pin cable to the smart box under the cluster on the passenger side.
Then connect the adapter cable to the OBD function extension cable. Don’t use other Toyoa 30 pin cbale in case it does not fit the OBD extension cable.

Turn off the igntion.
Turn on and flash the hazard lights once and turn them off.
Read and save EEPROM Data.

Step 3: Add Smart Key
Then choose Add Proximity Key function.
We have backed up the eeprom data, hit Yes to continue.
Turn on the ignition switch.
The ignition switch turns on when the dashboard lights up.
Select we have a backup EEPROM option.
Load the EEPROM file we just backed up.

Hold a working smart key close to the start button.
After the buzzer sounds once, remove the key from the start button.
Then hold the generated KD TIB key close to the start button.
After hearing two beeps, remove the key from the start button.
The KD TIB key has been programmed successfully.

Test both keys and check if they are working properly.