Subaru WRX Owner's Manual page 447

7-72
Starting and operating/Reverse Automatic Braking System
malfunction may occur, including inability
to detect objects in the reversing direction.
If any strong impact is applied to the rear
bumper, contact a SUBARU dealer to
have the system inspected.
. Do not disassemble the sonar sensors.
NOTE
If the sonar sensors require repair or
replacement, or if the area of the rear
bumper near the sonar sensors re-
quires repair, paintwork or replace-
ment, contact your SUBARU dealer
for assistance.