1998 Lexus SC 300 Owners Manual - Page 28

KEYS AND DOORS ENGINE IMMOBILISER SYSTEM D Do not bend the key grip. D Do not cover the key grip with any material that cuts off electromagnetic waves. D Do not knock the key hard against other objects. D Do not leave the key exposed to high temperatures for a long period, such as on the dashboard and hood under the direct sunlight. D Do not put the key in water or wash it in an ultrasonic washer. D Do not use the key with electromagnetic materials. The engine immobiliser 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 at the bottom of the instrument cluster 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. For your Lexus dealer to make you a new key with built-in transponder chip, your dealer will need your key number and master key. However, there is a limit to the number of additional keys your Lexus dealer can make for you. 11