2009 Toyota Sienna Owners Manual - Page 479

4 -3 . Do-it -yourse lf m a int e na nc e T ire s Replace or rotate tires in accordance with maintenance schedules and treadwear. n Checking tires New tread Treadwear indicator Worn tread The location of treadwear indicators is shown by the "TWI" or " " marks, etc., molded on the sidewall of each tire. Vehicles with compact spare tire: check spare tire condition and inflation pressure. n Tire rotation Rotate the tires in the order shown. To equalize tire wear and extend tire life, Toyota recommends that tire rotation is carried out at the same interval as tire inspection. Front n The tire pressure warning system Your Toyota is equipped with a tire pressure warning system that uses tire pressure warning valves and transmitters to detect low tire inflation pressure before serious problems arise. (→P. 507) Vehicles with compact spare tire: The compact spare tire is not equipped with the tire pressure warning valve and transmitters. 454