TOYOTA 2011 Sienna - Manual (Page 690)

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4-3. Do-it-yourself maintenance
■ Initializing the tire pressure warning system
Initialize the system with the tire inflation pressure adjusted to the speci-
fied level.
■ If the tread on snow tires wears down below 0.16 in. (4 mm)
The effectiveness of the tires as snow tires is lost.
■ If you press the tire pressure warning reset switch accidentally
If initialization is performed, adjust the tire inflation pressure to the speci-
fied level and initialize the tire pressure warning system again.
■ When the initialization of the tire pressure warning system has
failed
Initialization can be completed in a few minutes. However, in the follow-
ing cases, the settings has not been recorded and the system will not
operate properly. If repeated attempts to record tire inflation pressure
settings are unsuccessful, have the vehicle inspected by your Toyota
dealer.
● When operating the tire pressure warning reset button, the tire pres-
sure warning light does not flash 3 times.
● After driving for a certain period of time since the initialization has
been completed, the warning light comes on after blinking for 1
minute.