I have read many posts regarding 2003/2004 models require dealer/locksmith programming. I have used these instructions 3 times to delete and add keys to a 2004 LX470 successfully. YMMV.
To delete all keys except the current master key:
To add master key:
To delete all keys except the current master key:
- Close all doors.
- Insert master key in the ignition and remove key. Do this 5 times.
- Insert master key in the ignition.
- Open and close driver door 7 times. Security light will blink.
- Remove master key.
To add master key:
- Close all doors.
- Insert master key in the ignition and remove key. Do this 4 times.
- Insert master key in the ignition.
- Open and close driver door 6 times.
- Remove master key. Security light will turn solid to indicate the system is in programming mode.
- Insert new key. Security light will blink. Wait for about 1 minute until the security light stop blinking.
- Remove new key.