Toyota Avalon 2008 Quick Reference Manual page 349

Registering ID codes
The tire pressure warning valve and transmitter is equipped with a
unique ID code.
When replacing a tire pressure warning valve and transmitter, it is
necessary to register the ID code of tire pressure warning valve and
transmitter. Have the ID code registered by your Toyota dealer.
When to replace your vehicle's tires
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Tires should be replaced if:
You have tire damage such as cuts, splits, cracks deep enough to
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expose the fabric or bulges indicating internal damage
A tire goes flat repeatedly or cannot be properly repaired due to the
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size or location of a cut or other damage
If you are not sure, consult with your Toyota dealer.
Replacing tires and wheels
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If the ID code of the tire pressure warning valve and transmitter is not
registered, the tire pressure warning system will not work properly. After
about 20 minutes, the tire pressure warning light comes on after blinking
for 1 minute to indicate a system malfunction.
Tire life
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Any tire over 6 years old must be checked by a qualified technician even
if they have seldom or never been used or damage is not obvious.
If the tread wears down below 0.16 in. (4 mm) on snow tires
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The effectiveness of snow tires is lost.
4-3. Do-it-yourself maintenance
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