Lexus LS460 2011 Owner's Manual page 731

5-2. Steps to take in an emergency

If the tire pressure warning system is inoperative
The tire pressure warning system will be disabled in the following condi-
tions:
(When the condition becomes normal, the system will work properly.)

If tires not equipped with tire pressure warning valves and transmitters
are used.

If the ID code on the tire pressure warning valves and transmitters is not
registered in the tire pressure warning computer.

If the tire inflation pressure is 500 kPa (5.1 kgf/cm
higher.
The tire pressure warning system may be disabled in the following condi-
tions:
(When the condition becomes normal, the system will work properly.)

If electronic devices or facilities using similar radio wave frequencies
are nearby.

If a radio set at similar frequencies is in use in the vehicle.

If a window tint that affects the radio wave signals is installed.

If there is a lot of snow or ice on the vehicle, in particular around the
wheels or wheel housings.

If non-genuine Lexus wheels are used. (Even if you use Lexus wheels,
the tire pressure warning system may not work properly with some types
of tires.)

If tire chains are used.

With a spare tire: If the spare tire is in a location subject to poor radio
wave signal reception.

If a large metallic object which can interfere with signal reception is put
in the trunk.

If a tire that was repaired using an emergency tire puncture repair kit is
used.

If the tire pressure warning light frequently comes on after blinking for 1
minute
If the tire pressure warning light frequently comes on after blinking for 1
minute when the "ENGINE START STOP" switch is turned to IGNITION
ON mode, have it checked by any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.
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