2007 Lexus SC 430 Owners Manual - Page 236

4-3. Do-it-yourself maintenance n Selecting ID codes When replacing tires, make sure to select the ID code set that matches the new tire set. If the tire pressure select switch is set to the wrong tire setting, the system will not work properly. After about 1 hour, the tire pressure warning light comes on after blinking for 1 minute to indicate a system malfunction. "MAIN" "2nd" n When to replace your vehicle's tires 4 Tires should be replaced if: l You have tire damage such as cuts, splits, cracks deep enough to expose the Maintenance and care 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 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 snow tires is lost. 221