Lexus RX450H Manual page 534

Registering ID codes
The tire pressure warning valve and transmitter is equipped with a
unique ID code. When replacing a tire pressure warning valve and
transmitter, it is necessary to register the ID code. Have the ID
code registered by any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.

When to replace your vehicle's tires
Tires should be replaced if:

You have tire damage such as cuts, splits, cracks deep enough to expose
the fabric, and bulges indicating internal damage

A tire goes flat repeatedly or cannot be properly repaired due to the size
or location of a cut or other damage
If you are not sure, consult with any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.

Replacing tires and wheels
If the ID code of the tire pressure warning valve and transmitter is not regis-
tered, the tire pressure warning system will not work properly. After driving
for about 10 minutes, the tire pressure warning light blinks for 1 minute and
stays on to indicate a system malfunction.

Tire life

Standard tire over 6 years old must be checked by a qualified technician
even if they have seldom or never been used or damage is not obvious.

The compact spare tire could be deformed gradually in the long term
even if you don't use it. Be sure to have the compact spare tire checked
by any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional if it is over 5 years.

Routine tire inflation pressure checks
The tire pressure warning system does not replace routine tire inflation pres-
sure checks. Make sure to check tire inflation pressure as part of your rou-
tine of daily vehicle checks.

If the tread on snow tires wears down 4 mm (0.16 in.)
The effectiveness of the tires as snow tires is lost
RX450h_EE
4-3. Do-it-yourself maintenance
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