See also:

If you lose your keys
New genuine Lexus keys can be made by your Lexus dealer using the other keys 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 ...

Electronic key battery
Replace the battery with a new one if it is discharged. You will need the following items: Flathead screwdriver. Small Phillips-head screwdriver. Lithium battery (CR1632). Replacing the battery ...