Lexus IS300H 2017 Manual page 529

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.
• 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 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.
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
When the vehicle is parked, the time taken for the warning to start or go off could be
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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 pres-
sure adjustment.
If you have accidentally turned the power switch off during initialization, it is not neces-
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sary to press the reset switch again as initialization will restart automatically when the
power switch has been turned to ON mode for the next time.
If you accidentally press the reset switch when initialization is not necessary, adjust the
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tire inflation pressure to the specified level when the tires are cold, and conduct initial-
ization again.
Warning performance of the tire pressure warning system
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The warning of the tire pressure warning system will change in accordance with the con-
ditions under which it was initialized. For this reason, the system may give a warning even
if the tire pressure does not reach a low enough level, or if the pressure is higher than the
pressure that was adjusted to when the system was initialized.
7-3. Do-it-yourself maintenance
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