Lexus LS 600h L 2012 Owner's Manual page 514

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 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 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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If the spare tire is in a location subject to poor radio wave signal reception
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If a large metallic object which can interfere with signal reception is put in the
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trunk
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 "POWER" switch is turned to ON mode, have it checked by your Lexus
dealer.
Customization
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The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features →P. 573)
5-2. Steps to take in an emergency
2
or bar) or higher
5
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