Toyota 2009 Avalon Owner's Manual page 416

Front passenger detection sensor and passenger seat belt reminder
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If luggage is placed on the front passenger seat, the front passenger detec-
tion sensor may cause the warning light to flash, even if a passenger is not
sitting in the seat.
If the tire pressure warning system is inoperative
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The tire pressure warning system will be disabled in the following condi-
tions:
(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 be disabled in the following condi-
tions:
(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
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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 spare tire is in a location subject to poor radio wave signal
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reception.
If a large metallic object which can interfere with signal reception is
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put in the trunk.
5-2. Steps to take in an emergency
2
or bar) or
5
393