Ford 2013 Explorer Owner's Manual page 253

Blocked Sensor
WARNING: Do not use ACC when towing a trailer with brake
controls. Aftermarket trailer brakes will not function properly
when ACC is activated because the brakes are electronically controlled.
Failing to do so may result in loss of vehicle control, which could result
in serious injury.
WARNING: Do not use tires sizes other than those
recommended because this can affect the normal operation of
ACC. Failing to do so may result in a loss of vehicle control, which
could result in serious injury.
Cause
The surface of the radar in the
grille is dirty or obstructed in
some way
The surface of the radar in the
grille is clean but the message
remains in the display
Heavy rain or snow is interfering
with the radar signals
2013 Explorer (exp)
Owners Guide gf, 2nd Printing
USA (fus)
Cruise Control
A message regarding a blocked sensor
is displayed if the radar signals from
the sensor have been obstructed. The
sensor is located behind a fascia cover
near the driver side of the lower
grille. A vehicle ahead cannot be
detected and the system will not
function when the radar signals are
obstructed. The following table lists
possible causes and actions for this
message being displayed.
Action
Clean the grille surface in front of
the radar or remove the object
causing the obstruction
Wait a short time. It may take
several minutes for the radar to
detect that it is no longer
obstructed
Do not use ACC in these condition
because it may not detect, warn,
or respond to potential collisions.
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