Toyota Prius 2018 Owner's Manual page 625

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When initialization of the tire pressure warning system has failed
Initialization can be completed in a few minutes. However, in the following
cases, the settings have not been recorded and the system will not oper-
ate properly. If repeated attempts to record tire inflation pressure settings
are unsuccessful, have the vehicle inspected by your Toyota dealer.
●
When operating the initialization of the system, the tire pressure warning
light does not flash 3 times and the setting message does not appear on
the multi-information display.
●
After driving for a certain period of time since the initialization has been
completed, the warning light comes on after blinking for 1 minutes.
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Certification for the tire pressure warning system

For vehicles sold in the U.S.A., Hawaii, American Samoa, Guam,
Saipan and Puerto Rico

For vehicles sold in Canada
PRIUS_OM_OM47B89U_(U)
7-3. Do-it-yourself maintenance
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