Toyota Prius Owner's Manual page 507


If the tire pressure warning system is not functioning (vehicles with the
tire pressure warning system)
The tire pressure warning system will be disabled in the following conditions:
(When the condition becomes normal, the system will work properly.)

If tires not equipped with tire pressure warning valves and transmitters
are used

If the ID code on the tire pressure warning valves and transmitters is not
registered in the tire pressure warning computer

If the tire inflation pressure is 500 kPa (5.1 kgf/cm
The tire pressure warning system may be disabled in the following condi-
tions:
(When the condition becomes normal, the system will work properly.)

If electronic devices or facilities using similar radio wave frequencies are
nearby

If a radio set at a similar frequency is in use in the vehicle

If a window tint that affects the radio wave signals is installed

If there is a lot of snow or ice on the vehicle, particularly around the
wheels or wheel housings

If non-genuine Toyota wheels are used (Even if you use Toyota wheels,
the tire pressure warning system may not work properly with some types
of tires.)

If tire chains are used
PRIUS_OM_OM47A19E_(EE)
5-2. Steps to take in an emergency
2
, 73 psi) or higher
5
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