Lexus RX 450h 2012 Owner's Manual page 605

5-2. Steps to take in an emergency
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. Replace the spare tire with the
repaired tire and adjust the tire inflation pressure. The tire pressure warning light
will go off after a few minutes.
If the tire pressure warning system is not functioning
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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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Vehicles with a full-size spare tire: If the spare tire is in a location subject to poor
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radio wave signal reception
Vehicles with a full-size spare tire: If a large metallic object which can interfere
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with signal reception is put in the luggage compartment
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.
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or bar) or higher