2004 Lexus RX 330 Owners Manual - Page 536

STARTING AND DRIVING Low tire pressure warning light If you have a flat tire, replace it with the spare tire. For details, see "If you have a flat tire" on page 556. D If the warning light blinks every 0.5 seconds: The low tire pressure warning system may be malfunctioning. Contact your Lexus dealer. D If the warning light blinks every 0.25 seconds: The low tire pressure warning system needs to be initialized. Reset the system with the tire pressure warning system reset switch. (To reset the system, see "Tire pressure warning system reset switch".) The tire pressure warning system does not function properly under certain circumstances. In the following cases, the low tire pressure warning light may not come on even if the tire inflation pressure is low, or it may come on when the tire inflation pressure is actually normal. D A compact spare tire, snow tires, or tire chains are used. D The tire inflation pressure is excessively higher than specified, or tire inflation pressure suddenly drops due to bursting or other causes. D The vehicle is driven on a slippery road surface such as rough or frozen roads. D The vehicle speed is less than 30 km/h (19 mph) or more than 100 km/h (62 mph), and the driving duration is less than 5 minutes. D The tires differ in tread pattern or manufacturer. D The tires are not the specified size. This light comes on when the ignition key is turned to the "ON" position. It goes off after a few seconds. This indicates that the tire pressure warning system is functioning properly. If the low tire pressure warning light comes on or blinks while driving, do the following. D If the warning light comes on: The tire pressure is critically low. Adjust the tire inflation pressure to the specified level as soon as possible. (See "Tires and wheels" on page 651.) Once the ignition switch is turned off, the warning light also goes off. If the light comes on again when the vehicle is started after adjusting tire inflation pressure to the specified level, have the system checked at your Lexus dealer. 513