2009 Lexus LS 460 Owners Manual - Page 639

4-3. Do-it-yourself maintenance Registering ID codes The tire pressure warning valve and transmitter is equipped with a unique ID code. When replacing a tire pressure warning valve and transmitter, it is necessary to register the ID code of tire pressure warning valve and transmitter. Have the ID code registered by your Lexus dealer. n When to replace your vehicle's tires Tires should be replaced if: l You have tire damage such as cuts, splits, cracks deep enough to expose the fabric or bulges indicating internal damage. l A tire goes flat repeatedly or cannot be properly repaired due to the size or location of a cut or other damage. If you are not sure, consult with your Lexus dealer. n Replacing tires and wheels If the ID code of the tire pressure warning valve and transmitter is not registered, the tire pressure warning system will not work properly. After driving for about 20 minutes, the tire pressure warning light comes on after blinking for 1 minute to indicate a system malfunction. n Tire life Any tire over 6 years old must be checked by a qualified technician even if they have seldom or never been used or damage is not obvious. n If the tread wears down below 0.16 in. (4 mm) on snow tires The effectiveness of the tires as snow tires is lost. n If you push the tire pressure warning reset switch accidentally If initialization is performed, adjust the tire inflation pressure to the specified level and initialize the tire pressure warning system again. 568