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SIENNA_OM_OM08035U_(U)
425
6-3. Do-it-yourself maintenance
6
Maintenance and care
■ Situations in which the tire pressure warning system may not oper-
ate properly
The tire pressure warning system will be disabled in the following condi-
tions:
(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 73 psi (500 kPa, 5.1 kgf/cm
2
or bar) or
higher.
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 similar frequencies 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, in particular 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.
■ Initializing the tire pressure warning system
Initialize the system with the tire inflation pressure adjusted to the speci-
fied level.
■ 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 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 tire pressure warning reset switch, the tire pressure
warning light does not blink 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.
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