Subaru Forester Manuals 2017 Forester Owner's Manual | Page 471

7-68 Starting and operating/Reverse Automatic Braking System nated, the Reverse Automatic Braking system cannot be operated. . In the following cases, the system may not be able to properly detect an obstacle. Promptly contact a SUBARU dealer to have the system inspected. – A sticker, paint, or a chemical is applied to the rear bumper near the sonar sensor – The rear bumper is modified – The rear bumper has been removed and reattached – The ground clearance is changed due to the vehicle’s loading condition or modification – Ice, snow or mud is adhered to the rear bumper near the sonar sensor – The rear bumper is exposed to strong impact, or the rear bumper is deformed . On a steep hill, the system’s automatic braking ability will be reduced. . The system is designed to avoid collisions by automatic hard braking when the vehicle’s reversing speed is less than approximately 3 mph (5 km/h). However, the system does not guarantee that the vehicle will be able to avoid collisions in any situation. . If the vehicle is reversed at an extremely slow speed, the driver’s operation may be prioritized. In this case, automatic braking will not operate. . The system may not be able to detect the following objects – Sharp or thin objects such as poles, fences and ropes which may not reflect the sound wave emitted from the sonar sensor – 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 following conditions exist High frequency sound from other sources are nearby – Horn sound from another vehicle – Engine sound from other vehicles – Sound of an air brake – 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 rear bumper near the sonar sensors is exposed to heavy rain or a significant amount of water – Fog, snow or sandstorm, etc. – Air is moving rapidly such as when a strong wind is blowing