Toyota Yaris Sedan 2008 Quick Reference Manual page 311

If the tire pressure warning system is inoperative
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The tire pressure warning system will become inoperative in the follow-
ing conditions:
(When the condition becomes normal, the system will work properly.)
If tires not equipped with tire pressure warning valves and transmit-
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ters are used.
If the ID code on the tire pressure warning valves and transmitters is
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not registered in the tire pressure warning computer.
If the tire inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm
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higher.
The tire pressure warning system may become inoperative in the follow-
ing conditions:
(When the condition becomes normal, the system will work properly.)
If electronic devices or facilities using similar radio wave frequencies
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are nearby.
If a radio set at similar frequencies is in use in the vehicle.
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If a window tint that affects the radio wave signals is installed.
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If there is a lot of snow or ice on the vehicle, in particular around the
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wheels or wheel housings.
If non-genuine Toyota wheels are used. (Even if you use Toyota
l
wheels, the tire pressure warning system may not work properly with
some types of tires.)
If tire chains are used.
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If the tire pressure warning light comes on after blinking for 1
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minute frequently
If the tire pressure warning light comes on after blinking for 1 minute fre-
quently when the engine switch is turned to the ON position, have it
checked by your Toyota dealer.
n After changing the engine oil (except Canada)
Make sure to reset the oil maintenance data. (→P. 230)
Customization that can be configured at Toyota dealer
n
The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features→P. 351)
5-2. Steps to take in an emergency
2
or bar) or
5
299