Subaru WRX 2021 Owner's Manual page 331

– Objects that are too close to the
rear bumper when the select lever is
set to the "R" position.
– Objects with a surface which may
not reflect the sound wave emitted
from the sonar sensor such as a
chain link fence.
. Objects the system is not designed
to detect.
– Pedestrians
– Moving objects including moving
vehicles
– Objects which absorb sound
waves such as cloth or snow.
– Objects whose surface has a
diagonal angle.
– Objects that are low to the ground
such as parking blocks.
– Objects that are high above the
ground such as objects hanging
from above.
. The system may not be able to
properly detect objects or may cause
a system malfunction when the follow-
ing conditions exist.
High frequency sound from other
sources are nearby:
– Horn sound from another vehicle
– Engine sound from other vehi-
cles
– Sound of an air brake
Starting and operating/Reverse Automatic Braking (RAB) system
– Vehicle detection equipment or a
sonar from another vehicle
– A sound wave with a frequency
similar to the vehicle's system is
transmitted nearby.
– A vehicle equipped with the same
system is reversing toward your
reversing direction.
Weather conditions:
– Extremely high or extremely low
temperatures in which the area near
the sonar sensor becomes too hot
or too cold to operate.
– The sonar sensors or the rear
bumper near the sonar sensors is
exposed to heavy rain or a signifi-
cant amount of water.
– Fog, snow or sandstorm, etc.
– Air is moving rapidly such as
when a strong wind is blowing.
Parts attached to the rear bumper
near the sonar sensor:
– Commercial electronic parts (fog
light, fender pole, radio antenna) or
commercial attachment parts (trai-
ler hitch, bicycle carrier, bumper
guard) are attached.
– Parts that emit high frequency
sound, such as a horn or speaker,
are attached.
Vehicle conditions:
– The vehicle is significantly in-
clined.
– The ground clearance is signifi-
cantly reduced due to the vehicle's
loading condition, etc.
– When the sonar sensor is mis-
aligned due to a collision or an
accident.
Surrounding environment:
– A cloth banner, flag, hanging
branch or railroad crossing bars
are present in the reversing direc-
tion.
– When reversing on a gravel or
grassy area.
– When reversing in an area where
objects or walls are adjacent to the
vehicle such as narrow tunnels,
narrow bridges, narrow roads or
narrow garages.
– Wheel tracks or a hole is present
in the ground of the reversing
direction.
– When reversing over a drainage
cover (grate cover).
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