Tire Pressure Warning System - Lexus SC 430 2004 Manual

TIRE PRESSURE WARNING
SYSTEM
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This light and chimes warn you that the tire inflation pressure
is low. This light comes on when the ignition switch is turned
to the "ON" position and goes off after a few seconds. This
means the low tire pressure warning light is operating properly.
If the warning light does not go off, or comes on or blinks during
driving, or the chimes sound, this indicates that tire inflation
pressure is low. Make sure there is no flat tire. If the warning
light comes on again even after air is put in the tires, a tire may
be flat or the system may be malfunctioning.
If this warning light comes on, the action you must take is
different depending on the type of tires used.
STARTING AND DRIVING
If you drive over about 180 km/h (112 mph) with the tires not
inflated at the designated pressure for high speed driving, the
warning light may turn on. If the tires are at the designated
pressure for ordinary speed driving, decreasing the speed will
turn off the warning light. (For the designated pressure for high
speed driving, see "Specifications" on page 326.)
This 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, adjusting the tire inflation pressure
will turn off the warning light. For details about adjusting the tire
inflation pressure, see "Checking tire inflation pressure" on
page 329.
Vehicles with run-flat tires:
If the warning light is on, the tire inflation pressure is lower
than specified.
Stop your vehicle at a safe place as soon as possible and
check that the tire inflation pressure is as specified on the tire
and loading information label. The tire pressure gauge is
located in the tool bag. If the warning light comes on or blinks
even after tire inflation pressure adjustment, it is probable that
you have a flat tire. If you cannot verify the tire inflation
pressure soon, go to the nearest Lexus dealer or authorized
tire dealer at the moderate speed and do not ever exceed 90
km/h (55 mph) and have all your vehicle's tires checked and
adjusted. And whether there is a flat tire or not should be also
checked at this time. If any tire must be replaced, see "If you
have a flat tire" on page 245.
If the warning light does not go off about more than 15 minutes
after air is put in the deflated tire, the system might be
malfunctioning. Consult your Lexus dealer.
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