Toyota 1999 Sienna Owner's Manual page 178

If the low tire pressure warning light
comes on while driving, adjust
pressure to the specified level. (See
"Tires" in Part 8.)
After the tire pressure is adjusted, the
light should go off after driving at about
more than 30 km/h (19 mph) for some
time. If the light still remains, have the
tire pressure warning system checked at
your Toyota dealer.
178
The tire pressure warning system does
tire not function properly under certain cir-
cumstances. In the following cases, the
low tire pressure warning light may not
come on even if the tire pressure is
low, or it may come on when the tire
pressure is actually normal.
D
If the tread wear is uneven among the
installed tires,
D
If a compact spare tire, snow tires, or
tire chains are used,
D
If the tire pressure is excessively high-
er than specified, or if tire pressure is
suddenly reduced due to bursts or oth-
er causes,
D
If the vehicle is driven on a slippery
road surface such as rough road and
frozen road,
D
If the vehicle speed is less than 30
km/h (19 mph) or more than 100 km/h
(62 mph), and if the driving duration is
less than 5 minutes,
name. SIENNA (45403U)
AFTER REPLACING OR ROTATING
TIRES OR WHEELS
Initial adjustment of the tire pressure
warning system is necessary after you
have replaced or rotated your tires or
wheels.
1. Park the vehicle at a safe place and
apply the parking brake. Stop the en-
gine.
2. Adjust pressures of all the installed
tires to the specified level. (See "Tires"
in Part 8.)
3. Turn the ignition key to "ON".