423
6-3. Do-it-yourself maintenance
6
Maintenance and care
■ Situations in which the tire pressure
warning system may not operate prop-
erly
● In the following cases, the tire pressure
warning system may not operate prop-
erly.
• If non-genuine Lexus 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.
• If a window tint that affects the radio wave
signals is installed.
• If there is a lot of snow or ice on the vehi-
cle, particularly around the wheels or
wheel housings.
• If the tire inflation pressure is extremely
higher than the specified level.
• If tires not equipped with tire pressure
warning valves and transmitters are used.
• If the ID code on the tire pressure warn-
ing valves and transmitters is not regis-
tered in the tire pressure warning
computer.
● Performance may be affected in the fol-
lowing situations.
• 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, cellular
phone, cordless phone or other wireless
communication device
● If tire position information is not correctly
displayed due to the radio wave condi-
tions, the display may be corrected by
changing the location of the vehicle as
the radio wave conditions may change.
● When the vehicle is parked, the time
taken for the warning to start or go off
could be extended.
● When tire inflation pressure declines rap-
idly for example when a tire has burst, the
warning may not operate.
When replacing tires or wheels, tire
pressure warning valves and transmit-
ters must also be installed.
When new tire pressure warning
valves and transmitters are installed,
new ID codes must be registered in the
tire pressure warning computer.
(P.426)
■ Replacing tires and wheels
If the ID code of the tire pressure warning
valve and transmitter is not registered, the
tire pressure warning system will not work
properly. In this case, after driving for about
20 minutes, the tire pressure warning light
blinks for 1 minute and stays on to indicate a
system malfunction.
■ When to register the position of
each wheel
It is necessary to register the position
of each wheel after performing a tire
Installing tire pressure warning
valves and transmitters
NOTICE
■ Repairing or replacing tires, wheels,
tire pressure warning valves, trans-
mitters and tire valve caps
● When removing or fitting the wheels,
tires or the tire pressure warning
valves and transmitters, contact your
Lexus dealer as the tire pressure warn-
ing valves and transmitters may be
damaged if not handled correctly.
● Make sure to install the tire valve caps.
If the tire valve caps are not installed,
water could enter the tire pressure
warning valves, corrode the valve, and
cause sticking and air leaks.
● When replacing tire valve caps, do not
use tire valve caps other than those
specified. The cap may become stuck.
Registering the position of each
wheel
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