Lexus GX 470 2009, Owner'S Manual, Page: 398 / 470

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5-2. Steps to take in an emergency
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When the tire pressure warning light comes on
Check the tire inflation pressure and adjust to the appropriate level.
■
The tire pressure warning light may turn on due to natural causes
The tire pressure warning light may turn on due to natural causes such as natural air
leaks or tire inflation pressure changes caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the warning light (after a few minutes).
■
When a tire is replaced with a 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 the proper tire inflation pressure. The tire pressure warning
light will turn off after a few minutes.
■
If the tire pressure warning system is inoperative
The tire pressure warning system will become inoperative 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 regis-
tered in the tire pressure warning computer.
●
If the tire pressure warning select switch is set to a different tire setting.
●
If the tire inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm
2
or bar) or higher.