Lexus IS250 2009, Service Manual

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4-3. Do-it-yourself maintenance
4
Main
tenance an
d care
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When to replace your vehicle’s tires
Tires should be replaced if:
l
You have tire damage such as cuts, splits, cracks deep enough to expose the
fabric or bulges indicating internal damage
l
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 your Lexus dealer.
n
Replacing tires and wheels
If the ID code of the tire pressure warning valve and transmitter is not registered,
the tire pressure warning system will not work properly. After driving for about 20
minutes, the tire pressure warning light comes on after blinking for 1 minute to indi-
cate a system malfunction.
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Tire life
Any 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.
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If the tread wears down below 0.16 in. (4 mm) on snow tires
The effectiveness of snow tires is lost.
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Low profile tires (models not equipped with 16-inch tires)
Generally, low profile tires will wear more rapidly and tire grip performance will be
reduced on snowy and/or icy roads when compared to standard tires. Be sure to
use snow tires or tire chains
*
on snowy and/or icy roads and drive carefully at a
speed appropriate for road and weather conditions.
*
: Tire chains cannot be mounted on 18-inch tires.
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Maximum load of tire
Check that the maximum load of the replaced tire is greater than 1/2 of the Gross
Axle Weight Ratings (GAWR) of either the front axle or the rear axle, whichever is
greater.
As for the maximum load of the tire, see the load limit at maximum cold tire inflation
pressure mentioned on the sidewall of the tire, and as for the Gross Axle Weight
Ratings (GAWR), see the Certification Label. (
→
P. 336, 449).