Ford SUPER DUTY 2015 Owner's Manual page 205

If the message only displays with
a trailer connected, the problem
is with the trailer wiring. Consult
your trailer dealer for assistance.
This can be a short to ground
(such as a chaffed wire), short to
voltage (such as a pulled pin on
trailer emergency breakaway
battery) or the trailer brakes may
be drawing too much current.
Points to Remember
Note: Do not attempt removal of
the trailer brake controller without
consulting the Workshop Manual.
Damage to the unit may result.
• Adjust gain setting before using
the trailer brake controller for
the first time.
• Adjust gain setting, using the
procedure above, whenever
road, weather and trailer or
vehicle loading conditions
change from when the gain
was initially set.
• Only use the manual control
lever for proper adjustment of
the gain during trailer setup.
Misuse, such as application
during trailer sway, could cause
instability of trailer or tow
vehicle.
Super Duty (), enUSA
Towing
• Avoid towing in adverse
weather conditions. The trailer
brake controller does not
provide anti-lock control of the
trailer wheels. Trailer wheels
can lock up on slippery
surfaces, resulting in reduced
stability of trailer and tow
vehicle.
• The trailer brake controller is
equipped with a feature that
reduces output at vehicle
speeds below 11 mph (18 km/h)
so trailer and vehicle braking is
not jerky or harsh. This feature
is only available when applying
the brakes using your vehicle's
brake pedal, not the controller.
• The controller interacts with
the brake control system and
powertrain control system of
your vehicle to provide the best
performance on different road
conditions.
• Your vehicle's brake system
and the trailer brake system
work independently of each
other. Changing the gain
setting on the controller does
not affect the operation of your
vehicle's brakes whether you
attach a trailer or not.
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