Lexus GS 350 Owner's Manual page 637

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.
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• 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.
• 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.
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,
airport or other facility that generates strong radio waves or electrical noise
• When carrying a portable radio, cellular phone, cordless phone or other wire-
less communication device
Vehicles with the tire inflation pressure display function: 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
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be extended.
When tire inflation pressure declines rapidly for example when a tire has burst, the
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warning may not function.
The initialization operation
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Make sure to carry out initialization after adjusting the tire inflation pressure.
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Also, make sure the tires are cold before carrying out initialization or tire inflation
pressure adjustment.
If you have accidentally turned the engine switch off during initialization, it is not
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necessary to press the reset switch again as initialization will restart automatically
when the engine switch has been turned to IGNITION ON mode for the next time.
If you accidentally press the reset switch when initialization is not necessary, adjust
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the tire inflation pressure to the specified level when the tires are cold, and conduct
initialization again.
6-3. Do-it-yourself maintenance
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