2004 Lexus GS 300 Owners Manual - Page 31

KEYS AND DOORS ENGINE IMMOBILIZER SYSTEM 11G035c w11L016 D Do not bend the key grip or flat key. D Do not cover the key grip or flat key with any material that cuts off electromagnetic waves. D Do not knock the key or flat key hard against other objects. D Do not leave the key or flat key exposed to high temperatures for a long period, such as on the dashboard or hood under direct sunlight. D Do not put the key or flat key in water or wash it in an ultrasonic washer. D Do not use the key or flat key with electromagnetic materials. The engine immobilizer system is a theft prevention system. When you insert the key in the ignition switch, the transponder chip in the key's head transmits an electronic code to the vehicle. The engine will start only when the electronic code in the chip corresponds to the registered ID code for the vehicle. The system is automatically set when the key is removed from the ignition switch. At this time, the security indicator light flashes. When you insert the key in the ignition switch, the security indicator light goes out and the system is canceled automatically, which enables the engine to start. The transponder chip of the flat key is in its key case. You can cancel the engine immobilizer system using the flat key. (For details, see "Flat key" on page 9.) 11