Lexus 2013 GS 350 Owner's Manual page 667

The tire pressure warning light may come on due to natural causes
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The tire pressure warning light may come on due to natural causes such as natural
air leaks and tire inflation pressure changes caused by temperature. In this case,
adjusting 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 a tire pressure warning valve and trans-
mitter. If a tire goes flat, the tire pressure warning light will not turn off even though
the flat tire has been replaced with the spare tire.
Conditions that the tire pressure warning system may not function properly
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P. 635
If the tire pressure warning light frequently comes on after blinking for 1 minute
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If the tire pressure warning light frequently comes on after blinking for 1 minute when
the engine switch is turned to IGNITION ON mode, have it checked by your Lexus
dealer.
Warning buzzer
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In some cases, the buzzer may not be heard because of noisy place or an audio
sound.
GS350_U (OM30C34U)
7-2. Steps to take in an emergency
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