2005 Lexus LS 430 Owners Manual - Page 410

STARTING AND DRIVING TIRE PRESSURE WARNING SYSTEM The tire pressure warning system is designed to provide warning using a message in the multi−information display, master warning light and warning tone when tire inflation pressure is critically low while driving. This message appears to inform you that such low tire pressure may hamper driving. As this system is not designed to operate when the vehicle is stopped, check the tire inflation pressure regularly. The recommended cold tire inflation pressure, tire size and the vehicle capacity weight are on the tire and loading information label. (For instructions, see "Checking tire inflation pressure" on page 469.) Installed tires should be of the specified size. They should be of the same size and construction. If tires other than the specified size are used, or if tires of different sizes or constructions are mixed, the tire pressure warning system will not function properly. Low tire pressure warning message w264 When the low tire inflation pressure is detected while driving, the master warning light comes on, the above message appears and a warning tone sounds. If the above message appears and adjust the tire inflation pressure to the specified level as soon as possible. Push the tire pressure warning system reset switch for a few seconds and make sure the warning message goes off. If the message still remains on, have your vehicle checked by your Lexus dealer as soon as possible. The tire pressure warning system does not function properly under certain circumstances. In the following cases, the low tire pressure warning may not turn on even if the tire inflation pressure is low, or it may turn 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 You are driving on slippery road surfaces such as rough or frozen roads. D You are driving under 30 km/h (19 mph) or above 100 km/h (62 mph) for less than 5 minutes. D The tires differ in tread pattern or manufacturer. D The tires are not the specified size. 371