Lexus LS460 Owners Book page 714

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 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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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 comes on after blinking for 1 minute frequently
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If the tire pressure warning light comes on after blinking for 1 minute frequently
when the "ENGINE START STOP" switch is turned to IGNITION 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. 772)
5-2. Steps to take in an emergency
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or bar) or higher.
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