Toyota 2008 FJ Cruiser Owner's Manual page 310

4-3. Do-it-yourself maintenance
Installing tire pressure warning valves and transmitters
When replacing tires or wheels, tire pressure warning valves and
transmitters must also be installed.
When new tire pressure warning valves and transmitters are installed,
sensor ID codes must be registered in the tire pressure warning com-
puter.
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.
If the ID code is not registered, the 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.
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.
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.
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