See also:

Immobilizer system
The vehicle's keys have built-in transponder chips that prevent the hybrid system from starting if the key has not been previously registered in the vehicle's on-board computer. Never leave the key ...

If you lose your keys
New genuine Lexus keys can be made by your Lexus dealer using the other key and the key number stamped on your key number plate. ...

Back door
The back door can be locked/unlocked and opened/closed by the following procedures: Opening the back door from outside the vehicle - Back door opener button Raise the back door while pushing up ...