2012 Lexus HS 250h Owners Manual - Page 505

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5-2. Steps to take in an emergency

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The tire pressure warning light may come on due to natural causes

The tire pressure warning light may come on due to natural causes such as natural

air leaks and tire inflation pressure changes caused by temperature. In this case,

adjusting the tire inflation pressure will turn off the warning light (after a few min-

utes).

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When a tire is replaced with a spare tire

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.

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If the tire pressure warning system is not functioning

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.

●

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 inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm

2

or bar) or higher.

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.

●

If a radio set at similar frequency 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, particularly 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.