2009 Lexus GX 470 Owners Manual - Page 394

5-2. Steps to take in an emergency The tire pressure warning system may become inoperative in the following conditions: (When the condition becomes normal, the system will work properly.) l If electronic devices or facilities using similar radio wave frequencies are nearby. l If a radio set at similar frequencies is in use in the vehicle. l If a window tint that affects the radio wave signals is installed. l If there is a lot of snow or ice on the vehicle, in particular around the wheels or l l l l wheel housings. If non-genuine Lexus wheels are used. (Even if you use genuine Lexus wheels, the tire pressure warning system may not work properly with some types of tires.) If tire chains are used. If the spare tire is in a location subject to poor radio wave signal reception. If a large metallic object which can interfere with signal reception is put in the luggage compartment. n If the tire pressure warning light comes on after blinking for 1 minute frequently If the tire pressure warning light comes on after blinking for 1 minute frequently when the engine switch is turned to the "ON" position, have it checked by your Lexus dealer. n After changing the engine oil (U.S.A. only) Make sure to reset the oil maintenance data. (→P. 335) 5 CAUTION n If the tire pressure warning light comes on When trouble arises Be sure to observe the following precautions. Failure to do so could cause loss of vehicle control and result in death or serious injury. l Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pres- sure immediately. l If the tire pressure warning light comes on even after tire inflation pressure adjust- ment, it is probable that you have a flat tire. Check the tires. If the tire is flat, change to the spare tire and have the flat tire repaired by the nearest Lexus dealer. l Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could lose control of the steering wheel or the brakes. 399