Ford EXPEDITION 2017 Owner's Manual page 194

The radar surface is dirty or obstructed
The radar surface is not dirty or obstructed
Heavy rainfall/snowfall interferes with the
radar signals
System Limitations
The Blind Spot Information and Cross
Traffic Alert systems do have their
limitations; situations such as severe
weather conditions or debris build-up on
the sensor area may limit vehicle detection.
The following are other situations that may
limit the Blind Spot Information System:
• Certain maneuvering of vehicles
entering and exiting the blind zone.
• Vehicles passing through the blind zone
at very fast rates.
• When several vehicles forming a
convoy pass through the blind zone.
The following are other situations that may
limit the Cross Traffic Alert:
• Adjacently parked vehicles or objects
obstructing the sensors.
• Approaching vehicles passing at
speeds greater than 15 mph (24 km/h).
• Driving in reverse faster than 3 mph
(5 km/h).
• Backing out of an angled parking spot.
Expedition (TB7) Canada/United States of America, enUSA, Edition date: 201604, Third Printing
Driving Aids
Reasons for messages being displayed
191
Clean the fascia area in front of the radar
or remove the obstruction.
Drive normally in traffic for a few minutes
to allow the radar to detect passing
vehicles so it can clear the blocked state.
No action required. The system automatic-
ally resets to an unblocked state once the
rainfall/snowfall rate decreases or stops.
Do not use the Blind Spot Information
System or Cross Traffic Alert in these
conditions.
False Alerts
Note: If you connected a trailer to your
vehicle, the Blind Spot Information System
may detect the trailer causing a false alert.
To avoid false alerts you may want to turn
the system off manually.
There may be certain instances when
either the Blind Spot Information or Cross
Traffic Alert systems illuminate the alert
indicator with no vehicle in the coverage
zone; this is known as a false alert. Some
amount of false alerts are normal; they are
temporary and self-correct.
System Errors
If the system senses a problem with the
left or right sensor, the telltale will
illuminate and a message will appear in
the information display. See Information
Messages (page 101).