Lexus GS 450h 2008 Owner's Manual page 498

5-2. Steps to take in an emergency
When the tire pressure warning light comes on
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Check the tire inflation pressure and adjust to the appropriate level. Pushing the tire
pressure warning reset switch does not turn off the tire pressure warning light.
If the tire pressure warning system is inoperative
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The tire pressure warning system will be disabled in the following conditions:
(When the condition becomes normal, the system will work properly.)
If tires not equipped with tire pressure warning valves and transmitters are used.
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If the ID code on the tire pressure warning valves and transmitters is not regis-
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tered in the tire pressure warning computer.
If the tire pressure warning select switch is set to a different tire setting.
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If the tire inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm
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The tire pressure warning system may be disabled in the following conditions:
(When the condition becomes normal, the system will work properly.)
If electronic devices or facilities using similar radio wave frequencies are nearby.
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If a radio set at similar frequencies is in use in the vehicle.
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If a window tint that affects the radio wave signals is installed.
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If there is a lot of snow or ice on the vehicle, in particular around the wheels or
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wheel housings.
If non-genuine Lexus wheels are used. (Even if you use Lexus wheels, the tire
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pressure warning system may not work properly with some types of tires.)
If tire chains are used.
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The tire pressure warning light may turn on due to natural causes
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The tire pressure warning light may turn on due to natural causes such as natural air
leaks or tire inflation pressure changes caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the warning light (after a few minutes).
When a tire is replaced with a spare tire
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The compact spare tire is not equipped with the tire pressure warning valve and
transmitter. If a tire goes flat, the tire pressure warning light will not turn off even
though the flat tire is replaced with the spare tire. Replace the spare tire with the
repaired tire and adjust the proper tire inflation pressure. The tire pressure warning
light will turn off after a few minutes.
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or bar) or higher.