2003 Lexus GX 470 Owners Manual - Page 509

KEYS AND DOORS ENGINE IMMOBILISER SYSTEM 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. If you make your own duplicate key, you will not be able to cancel the system or start the engine. FCC ID: MOZRI−20BTY MADE IN JAPAN CAUTION This device complies with Part of the FCC Rules. by Changes or modifications not 15 expressly approved Operation is subject to the following two conditions: the party responsible for compliance could void the (1) This device may not cause harmful interference, user's authority to operate the equipment. and (2) this device must accept any interference received, including interference that may cause undesired operation. 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 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 immobiliser system using the flat key. (For details, see "Flat key" on page 9.) 12