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370
6-3. Do-it-yourself maintenance
C-HR_OM_USA_OM10569U
■
Situations in which the tire pressure warning system may not oper-
ate properly
● In the following cases, the tire pressure warning system may not operate
properly.
• If non-genuine Toyota 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.
• 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 wheels without 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.
• 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 wireless communication device.
● 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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