2006 Lexus GS 300 Owners Manual - Page 1143

IN CASE OF AN EMERGENCY IF YOU LOSE YOUR KEYS OR LOCK YOURSELF OUT You can purchase a new key at your Lexus dealer if you can give them the key number and electronic key. Even if you lose only one key, contact your Lexus dealer to make a new key. If you lose all your electronic keys, you cannot make new keys; the whole engine immobilizer must be replaced. See the suggestion given in "Keys" on page 8. You can use the smart access system with push−button start with the new key. Contact your Lexus dealer for detailed information. If your keys are locked in the vehicle and you cannot get a duplicate, many Lexus dealers can still open the door for you, using their special tools. If you must break a window to get in, we suggest breaking the smallest side window because it is the least expensive to replace. Be extremely cautious to avoid cuts from the glass. 497