Lexus SC 430 2002 Manual page 68

GAUGES, METERS AND SERVICE REMINDER INDICATORS
Vehicles with standard tires:
If the warning light is on, the tire pressure is lower than
specified.
Stop your vehicle at a safe place as soon as possible and
check that the tire pressure is as specified on the tire pressure
label. The air pressure gauge is located in the tool bag. If the
warning light comes on or blinks even after tire pressure
adjustment, it is probable that you have a flat tire. If the tire
goes flat, change to the spare tire. (See page 241).
The spare tire is not equipped with the tire pressure sensor.
So, the warning light remains on even if the spare tire is
mounted.
If the warning light does not go off more than 15 minutes after
air is put in the deflated tire, the system might be
malfunctioning. Consult your Lexus dealer.
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 306.)
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CAUTION
If the warning light comes on, observe the following
instructions:
D Decrease the speed as soon as possible.
D Avoid abrupt steering wheel maneuvering and
braking. If the vehicle tires deteriorate, you could
lose control of the steering wheel or the brakes,
causing death or serious injury.