FORD 2009 Flex v.2 - Manual (Page 275)

The RSS automatically turns on when the gear selector is placed in R
(Reverse) and the ignition is on. A control in the message center allows
the driver to disable the system only when the ignition is on and the
gear selector is in R (Reverse). Refer to Message center in the Driver
Controls chapter for more information.
Keep the RSS sensors (located on the rear bumper/fascia) free
from snow, ice and large accumulations of dirt (do not clean the
sensors with sharp objects). If the sensors are covered, it will
affect the accuracy of the RSS.
If your vehicle sustains damage to the rear bumper/fascia, leaving
it misaligned or bent, the sensing zone may be altered causing
inaccurate measurement of obstacles or false alarms.
REAR-VIEW CAMERA SYSTEM (IF EQUIPPED)
The rear-view camera system,
located on the liftgate, provides a
video image, which appears on the
navigation system screen (if
equipped), of the area behind the
vehicle. It adds assistance to the
driver while reversing or reverse
parking the vehicle.
2009 Flex (471)
Owners Guide, 2nd Printing
USA (fus)
Driving
275