See also:

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

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. ...

Items to initialize
The following items must be initialized for normal system operation in cases such as after the 12-volt battery is reconnected, or maintenance is performed on the vehicle. ...