2010 Lexus RX 450h User Guide 2 - Page 492

4-3. Do-it-yourself maintenance n The tire pressure warning system Your Lexus 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. 568) Installing tire pressure warning valves and transmitters When replacing tires or wheels, tire pressure warning valves and transmitters must also be installed. When new tire pressure warning valves and transmitters are installed, new tire pressure warning valve and transmitter ID codes must be registered in the tire pressure warning computer and the tire pressure warning system must be initialized. Have tire pressure warning valve and transmitter ID codes registered by your Lexus dealer. (→P. 499) 4 Initializing the tire pressure warning system Maintenance and care n The tire pressure warning system must be initialized in the following circumstances: l When tire inflation pressure is changed such as when changing travelling speed or load weight l When changing the tire size When the tire pressure warning system is initialized, the current tire inflation pressure is set as the benchmark pressure. 497