6-3. Do-it-yourself maintenance
304
pressure has been adjusted.
conditions.
●
Tire inflation pressure changes with
temperature. The displayed values
may also be different from the values
measured using a tire pressure
gauge.
●
●
■
When the vehicle is parked, the time
taken for the warning to start or go off
could be extended.
When tire inflation pressure declines
rapidly for example when a tire has
burst, the warning may not function.
■
●
Situations in which the tire pres-
sure warning system may not oper-
ate properly
Warning performance of the tire
pressure warning system
In the following cases, the tire pres-
sure warning system may not operate
properly.
The warning of the tire pressure warning
system will change in accordance with
driving conditions. 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.
ꢀ If non-genuine Toyota wheels are
used.
ꢀ A tire has been replaced with a tire
that is not an OE (Original Equipment)
tire.
ꢀ A tire has been replaced with a tire
that is not of the specified size.
ꢀ Tire chains, etc. are equipped.
ꢀ An auxiliary-supported run-flat tire is
equipped.
Installing tire pressure warn-
ing valves and transmitters
ꢀ 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.
When replacing tires or wheels, tire
pressure warning valves and trans-
mitters must also be installed.
When new tire pressure warning
valves and transmitters are
ꢀ If the tire inflation pressure is
extremely higher than the specified
level.
installed, new ID codes must be
registered in the tire pressure warn-
ing computer and the tire pressure
warning system must be initialized.
Have tire pressure warning valve
and transmitter ID codes regis-
tered by any authorized Toyota
retailer or Toyota authorized
repairer, or any reliable repairer.
(P.306)
ꢀ 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.
●
Performance may be affected in the
following situations.
ꢀ When driving near a TV tower, electric
power plant, gas station, radio station,
large display, airport or other facility
that generates strong radio waves or
electrical noise
ꢀ When carrying a portable radio, cellu-
lar phone, cordless phone or other
wireless communication device
■
Replacing tires and wheels
If the ID code of the tire pressure warn-
ing valve and transmitter is not regis-
tered, the tire pressure warning system
will not work properly. After driving for
about 10 minutes, the tire pressure
warning light blinks for 1 minute and
If tire position information is not correctly
displayed due to the radio wave condi-
tions, the display may be corrected by
driving and changing the radio wave