Toyota 2008 Camry Owner's Manual page 410

When a tires is replaced with a spare tire
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Vehicles with a compact spare tire
The compact spare tire is not equipped with the tire pressure warning
valve and transmitter. If a tire goes flat, the tire pressure warning light will
not turn off even though the flat tire is replaced with the spare tire.
Replace the spare tire with the repaired tire and adjust the proper tire
inflation pressure. The tire pressure warning light will turn off after a few
minutes.
Vehicles with a full-size spare tire
The spare tire is also equipped with the tire pressure warning valve and
transmitter. The tire pressure warning light will turn on if the tire inflation
pressure of the spare tire is low. If a tire goes flat, even though the flat
tire is replaced with the spare tire, the tire pressure warning light does
not turn off. Replace the spare tire with the repaired tire and adjust the
proper tire inflation pressure. The tire pressure warning light will turn off
after a few minutes.
If the tire pressure warning system is inoperative
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The tire pressure warning system may 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 electronic devices or facilities using similar radio wave frequencies
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are nearby.
If a large metallic object which can interfere with signal reception is
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put in the trunk
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.)
5-2. Steps to take in an emergency
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