Toyota 2005 4Runner Owner's Manual page 200

If the warning light blinks:
The tire pressure warning system may
be malfunctioning. Contact your Toyota
dealer.
SYSTEM MALFUNCTION
The tire pressure warning system does
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 inflation pres-
sure is low, or it may come on when
the tire inflation pressure is actually
normal.
Electric devices or facilities using simi-
D
lar radio wave frequencies are nearby.
A radio set to similar frequencies is in
D
use.
A lot of snow or ice covers the ve-
D
hicle, in particular, around the wheels
or wheel housings.
The tires are not equipped with an air
D
pressure sensor.
Snow tires or tire chains are used.
D
Non- genuine Toyota wheels are used.
D
The sensor battery is expired.
D
Radio waves from the air pressure sen-
D
sor installed on the spare tire cannot
be received.
190
'05 4Runner_U (L/O 0504)
CAUTION
The use of non- genuine wheels will
D
cause the air pressure sensors to
transmit the electronic code in dif-
ferent manner, resulting in the sys-
tem failure.
The use of different type of tires
D
with genuine wheels may
cause the malfunction of the sys-
tem.
also