Lexus RX450H Manual page 606

5-2. Steps to take in an emergency
Vehicles with a full-size spare tire
The spare tire is also equipped with the tire pressure warning valve and
transmitter. The tire pressure warning light will turn on if the tire inflation
pressure of the spare tire is low. If a tire goes flat, even though the flat tire is
replaced with the spare tire, the tire pressure warning light does not turn off.
Replace the spare tire with the repaired tire and adjust to the proper tire
inflation pressure. The tire pressure warning light will turn off after a few
minutes.

If the tire pressure warning system is not functioning
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

Vehicles with a full-size spare tire: If the spare tire is in a location subject
to poor radio wave signal reception

Vehicles with a full-size spare tire: If a large metallic object which can
interfere with signal reception is put in the luggage compartment

If the tire pressure warning light frequently comes on after blinking for 1
568
minute
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 any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
RX450h_EE
2
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