FORD 2013 Flex v.3 - Manual (Page 245)

System Sensors
WARNING: Just prior to the system recognizing a blocked
condition and alerting the driver, the number of missed objects
will increase. To help avoid injuries, NEVER use the BLIS® as a
replacement for using the side and rear view mirrors and looking over
your shoulder before changing lanes. BLIS® is not a replacement for
careful driving and only an assist.
Note: It is possible to get a blockage warning with no blockage present;
this is rare and known as a false blockage warning. A false blocked
condition either self-corrects or clears after a key cycle.
The system uses radar sensors
which are located behind the
bumper fascia on each side of the
vehicle. Do not allow these areas to
become obstructed by mud, snow or
bumper stickers, as this can cause
degraded system performance.
If the system detects a degraded
performance condition, BLIND
SPOT NOT AVAILABLE, or
CROSS TRAFFIC NOT
AVAILABLE appear in the information display and the alert indicator
illuminates in the appropriate mirror(s). The information display warning
can be cleared but the alert indicator remains illuminated.
When the blockage is removed, the system can be reset in two ways: 1)
when at least two objects are detected while driving, or 2) turn the ignition
key from on to off, then back on. If the blockage is still present after the
key cycle, the system senses again that it is blocked after driving in traffic.
Reasons for messages being displayed
The radar surface is
dirty or obstructed Clean the fascia area in front of the radar or
remove the obstruction.
The radar surface is
not dirty or obstructed Drive normally in traffic for a few minutes to
allow the radar to detect passing vehicles so it
can clear the blocked state.
Heavy rainfall/snowfall
interferes with the
radar signals No action required. The system automatically
resets to an unblocked state once the
rainfall/snowfall rate decreases or stops. Do
not use BLIS® and/or CTA in these conditions.
244 Driving Aids
2013 Flex (471)
Owners Guide gf, 3rd Printing, December 2012
USA (fus)