FORD 2011 Explorer v.3 - Manual (Page 308)

CTA coverage also decreases when parking at shallow angles (refer to
figure for approximate zone coverage areas [sensor obstructed for
vehicle on left]).
CTA detection limitations: Due to the nature of radar technology,
there may be certain instances where vehicles entering and exiting the
blind spot zones may not be detected. Below is a list of circumstances
that may cause non-detection:
• Debris build-up on the rear quarter panel fascias
• The rear quarter panel radar beams are obstructed or partially
obstructed by an adjacently parked vehicle or object.
• Approaching vehicles passing at speeds greater than 15 mph
(24 km/h)
• Severe weather conditions
• Driving in reverse faster than 3 mph (5 km/h)
• Backing out of an angled parking spot
CTA false alerts
Due to the nature of radar technology, there may be certain instances
when the BLIS
௡ will alert with no object present when backing up. This
is known as a false alert. Some level of false alerts are normal.
Circumstances that may cause a false alert when backing up are backing
out of a garage, backing into a parking space, and objects very close to
the sensor. False alerts are temporary and self correct.
Driving
308
2011 Explorer (exp)
Owners Guide, 4th Printing
USA (fus)