Lexus LS 500 2019 Owner's Manual page 385

before serious problems arise.
 The tire pressure detected by the
tire pressure warning system can be
displayed on the multi-information
display. (P.80)
 If the tire pressure drops below a
predetermined level, the driver is
warned by a screen display and a
warning light. (P.419)
■ Routine tire inflation pressure checks
The tire pressure warning system does not
replace routine tire inflation pressure
checks. Make sure to check tire inflation
pressure as part of your routine of daily
vehicle checks.
Tire inflation pressure
■
● It may take a few minutes to display the
tire inflation pressure after the engine
switch is turned to IGNITION ON mode.
It may also take a few minutes to display
the tire inflation pressure after inflation
pressure has been adjusted.
● Tire inflation pressure changes with tem-
perature. The displayed values may also
LS500_OM_(U)_1810
6-3. Do-it-yourself maintenance
be different from the values measured
using a tire pressure gauge.
■ 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.
• If a tire has been replaced with a tire that
is not an OE (Original Equipment) tire.
• If a tire has been replaced with a tire that
is not of the specified size.
• If tire chains, etc. are installed.
• An auxiliary-supported run-flat tire is
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 much higher
than the specified level.
• If wheels not equipped with tire pressure
warning valves and transmitter 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.
• 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 electri-
cal 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 conditions,
the display may be corrected by changing
the location of the vehicle as the radio wave
conditions may change.
● When the vehicle is stopped, the time
taken for the warning to start or turn off
may be longer.
When the inflation pressure of a tire
●
drops rapidly, for example when a tire has
burst, the warning may not operate.
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