2009 Toyota Sienna Owners Manual - Page 535

5-2. Steps to take in an emergency n If the tire pressure warning system is inoperative The tire pressure warning system will be disabled in the following conditions: (When the condition becomes normal, the system will work properly.) l If tires not equipped with tire pressure warning valves and transmit- ters are used. l If the ID code on the tire pressure warning valves and transmitters is not registered in the tire pressure warning computer. The tire pressure warning system may be disabled 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 there is a lot of snow or ice on the vehicle, in particular around the wheels or wheel housings. l If non-genuine Toyota wheels are used. (Even if you use Toyota wheels, the tire pressure warning system may not work properly with some types of tires.) l If tire chains are used. n If the tire pressure warning light comes on after blinking for 1 5 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 Toyota dealer. n Customization that can be configured at Toyota dealer The vehicle speed linked seat belt reminder buzzer can be disabled. (Customizable features →P. 565) However, Toyota recommends that the seat belt reminder buzzer be operational to alert the driver and front passenger that the seat belts are not fastened. When trouble arises 511