Lexus SC 430 2006 Owner's Manual page 277

5-2. Steps to take in an emergency
System malfunction
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The warning light comes on if the system does not work properly.
The system will be disabled in the conditions below:
Electric devices or facilities using similar radio wave frequencies are nearby.
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If a radio set at similar frequencies is in use.
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Much snowflakes or ice gets on the vehicle, in particular, around the wheels or
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wheel housings.
The sensor battery is expired.
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The tires not equipped with tire pressure sensor are used.
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Although the tires are equipped with the tire pressure sensors, the selector
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switch is set to other tire setting (P.213)
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