Lexus LS460 Owner's Manual page 809


If the tread on snow tires wears down below 4 mm (0.16 in.)
The effectiveness of the tires as snow tires is lost.

Situations in which the tire pressure warning system may not operate properly

In the following cases, the tire pressure warning system may not operate
properly.
• If non-genuine Lexus wheels are used.
• A tire has been replaced with a tire that is not an OE (Original Equip-
ment) tire.
• A tire has been replaced with a tire that is not of the specified size.
• Tire chains etc. are equipped.
• Lock nuts are equipped.
• 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 vehicle, particularly around the
wheels or wheel housings.
• If the tire inflation pressure is extremely higher than the specified level.
• If the spare tire is in a location subject to poor radio wave signal recep-
*
tion.
• If a large metallic object which can interfere with signal reception is put
in the trunk.
• 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.
*
: Vehicles with a spare tire

Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio station, large
display, airport or other facility that generates strong radio waves or elec-
trical 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 driving and changing the radio
wave conditions.

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.
LS460_EE (OM50D49E)
6-3. Do-it-yourself maintenance
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