Toyota 2006 4runner Owner's Manual page 192

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.
D
Electric devices or facilities using simi-
lar radio wave frequencies are nearby.
D
A radio set to similar frequencies is in
use.
D
A lot of snow or ice covers the ve-
hicle, in particular, around the wheels
or wheel housings.
D
The tires are not equipped with an air
pressure sensor.
D
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-
sor installed on the spare tire cannot
be received.
192
'06 4Runner_U (L/O 0508)
CAUTION
D
The use of non−genuine wheels will
cause the air pressure sensors to
transmit the electronic code in dif-
ferent manner, resulting in the sys-
tem failure.
D
The use of different type of tires
with genuine wheels may
cause the malfunction of the sys-
tem.
also
CAUTION
Each tire, including the spare (if pro-
vided), should be checked monthly
when cold and inflated to the inflation
pressure recommended by the vehicle
manufacturer on the vehicle placard
or tire inflation pressure label (tire
and load information label). (If your
vehicle has tires of a different size
than the size indicated on the vehicle
placard or tire inflation pressure label
(tire and load information label), you
should determine the proper tire infla-
tion pressure for those tires.)