Toyota 2015 Prius Owner's Manual page 467

Tire pressure warning system
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Your vehicle is equipped with a tire pressure warning system
that uses tire pressure warning valves and transmitters to detect
low tire inflation pressure before serious problems arise.
( P. 509)
The compact spare tire is not equipped with a tire pressure
warning valve and transmitter.
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, new ID codes must be registered in the tire pressure warn-
ing computer and the tire pressure warning system must be initial-
ized. Have tire pressure warning valve and transmitter ID codes
registered by your Toyota dealer. ( P. 449)
PRIUS_OM_OM47A17U_DVD_(U)
4-3. Do-it-yourself maintenance
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