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6-3. Do-it-yourself maintenance
If the tread on snow tires wears down below 0.16 in. (4 mm)
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The effectiveness of the tires as snow tires is lost.
Situations in which the tire pressure warning system may not operate properly
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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 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.
• 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 reception.
• If a large metallic object which can interfere with signal reception is put near the
spare tire.
• If tires not equipped with the 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.
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• Near a TV tower, electric power plant, gas station, radio station, large display, air-
port 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 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.
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