2007 Lexus RX 350 Owners Manual - Page 327

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 incorrect ID code is selected, the tire pressure warning system will not operate properly. Switching ID codes Push the tire pressure warning select switch to select MAIN or 2nd ID codes. 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 fab- 4 ric or bulges indicating internal damage Maintenance and care l A tire goes flat repeatedly or cannot be properly repaired due to the size or loca- tion 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. n Maximum load of tire Check that the maximum load of the replaced tire is greater than 1/2 of the Gross Axle Weight Ratings (GAWR) of either the front axle or the rear axle, whichever is greater. As for the maximum load of the tire, see the load limit at maximum cold tire inflation pressure mentioned on the sidewall of the tire, and as for the Gross Axle Weight Ratings (GAWR), see the Certification Label. (→P. 311, 402). 307