Toyota Prius Owner's Manual page 441


The initialization operation (vehicles with the tire pressure warning
system)

Make sure to carry out initialization after adjusting the tire inflation pres-
sure.
Also, make sure the tires are cold before carrying out initialization or tire
inflation pressure adjustment.

If you have accidentally turned the "POWER" switch off during initializa-
tion, it is not necessary to press the reset switch again as initialization will
restart automatically when the "POWER" switch has been turned to ON
mode for the next time.

If you accidentally press the reset switch when initialization is not neces-
sary, adjust the tire inflation pressure to the specified level when the tires
are cold, and conduct initialization again.

If the tread on snow tires wears down below 4 mm (0.16 in.)
The effectiveness of the tires as snow tires is lost.

Warning performance of the tire pressure warning system (vehicles
with the tire pressure warning system)
The warning of the tire pressure warning system will change in accordance
with the conditions under which it was initialized. For this reason, the system
may give a warning even if the tire pressure does not reach a low enough
level, or if the pressure is higher than the pressure that was adjusted to
when the system was initialized.

When initialization of the tire pressure warning system has failed (vehi-
cles with the tire pressure warning system)
Initialization can be completed in a few minutes. However, in the following
cases, the settings have 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 any authorized Toyota dealer or
repairer, or another duly qualified and equipped professional.

When operating the tire pressure warning reset switch, the tire pressure
warning light does not blink 3 times.

After carrying out the initialization procedure, the tire pressure warning
light blinks for 1 minute then stays on after driving for 20 minutes.
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4-3. Do-it-yourself maintenance
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