FORD F-150 2021 Owners Manual

TRAIL CONTROL – TROUBLESHOOTING - RAPTOR
TRAIL CONTROL – INFORMATION MESSAGES
Details
Message
Displays when you must reduce your vehicle speed touse trail control.
Reduce Speed To Enter Trail
Control
Displays when you must release the park brake to usetrail control.
Trail Control Not Available with
Park Brake Applied
Displays when you must switch off the trailer backupassist to use trail control.
Trail Control Not Available
While Pro Trailer Backup Assist™ Active
Displays when you successfully enabled trail controland can set a speed with the Set+ or Set- control.
Trail Control Enabled Use SET
Button to Set Speed
Displays when a system fault has occurred when trail
control was active and the driver must resume control.
Trail Control Off Driver Resume
Control
Displays when the system has turned off.
Trail Control Off
Displays when a system fault is present. See the trailcontrol section in your Owner's Manual. See your authorized dealer for diagnosis.
Trail Control Fault See Manual
Displays when you must be in drive (D), neutral (N) orreverse (R) to use trail control.
Trail Control To Activate Select
Gear
Displays when you must switch the cruise control offto use trail control.
Trail Control Not Available with
Cruise Control Active
Displays when you must close the driver door to usetrail control.
Trail Control Not Available with
Driver Door Open
Displays when the system detects you may be stuck
in sand and recommends using trail control on to the lowest set speed. Doing this could slowly pull sand under the tires to free the vehicle.
Set Trail Control to 1 MPH to Aid
in Getting Unstuck in Sand
Set Trail Control to 2 km/h to
Aid in Getting Unstuck in Sand
Due to some driver action, Trail Control propulsion wasturned off but the vehicle will still brake if descending
a hill. The driver must press the Trail Control switch to turn the feature OFF, they can then turn it back on.
Descent Control Now Active
Press Trail Control Switch To Exit
Displays when you must have the seatbelt on to use trail control.
Trail Control Not Available with
Seatbelt Off
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WHAT IS TRAIL TURN ASSIST
Trail turn assist can reduce the turning
radius of your vehicle by applying the
brakes to the inside rear wheel in
low-speed, high steering-angle maneuvers.
TRAIL TURN ASSIST
PRECAUTIONS
Note:
Do not use trail turn assist on dry,
hard surfaced roads. Doing so can produce
excessive noise, increase tire wear and may
damage drive line, or braking components.
Trail turn assist is only intended for slippery,
or loose surfaces.
You may hear noise from the anti-lock
brake system while trail turn assist is
active. This is normal operation.
TRAIL TURN ASSIST
LIMITATIONS
Trail turn assist can only be used when the
vehicle ’s four-wheel drive system is in the
four-wheel drive high (4H), or four-wheel
drive low (4L) modes.
Trail Turn Assist cannot be used when the
vehicle ’s rear differential is locked. If the
rear differential has recently been locked
prior to Trail Turn Assist being turned on,
Trail Turn Assist may not activate until it
can confirm that the rear differential is
unlocked.
SWITCHING TRAIL TURN
ASSIST ON AND OFF
You can switch the trail turn assist on or
off from the features section of the vehicle
on screen display.
1. Press Features on the touchscreen.
2. Press
Trail Turn Assist. 3. Switch
Trail Turn Assist on or off.
Switch trail turn assist on when your
vehicle is in four-wheel drive high (4H) or
four-wheel drive low (4L).
The system activates when the:
• Vehicle speed is less than
12 mph
(19.3 km/h).
• Rear differential is fully unlocked.
• Steering wheel is almost fully turned
to the left or right.
Switch trail turn assist off by performing
any of the following:
• Switch trail turn assist off from the
features section of the vehicle on
screen display.
• Select two-wheel drive high, or
four-wheel drive auto.
• Switch on the rear locking differential.
TRAIL TURN ASSIST
INDICATORS When trail turn assist is on, one
of these two indicators will be
displayed, depending on the
direction of the vehicle
’s last
turn. When the feature is on but
not in use, the indicator light will
be gray. When the feature is active the
indicator light will be green.
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TRAIL TURN ASSIST –
TROUBLESHOOTING
TRAIL TURN ASSIST –
INFORMATION MESSAGES
Details
Message
Switch to four-wheel
drive low (4L) or four-
wheel drive high (4H) to activate trail turn assist. See Selecting a Four-
Wheel Drive Mode (page
294).
Trail Turn
Assist Avail- able in 4L or 4H
Trail turn assist systemmalfunction could be
present. if this condition persists, have yourvehicle serviced.
Trail Turn
Assist Not
Available See Manual
You have activated trailturn assist.
Trail Turn
Assist ON
You have switched trailturn assist off.
Trail Turn
Assist OFF
TRAIL TURN ASSIST –
FREQUENTLY ASKED QUESTIONS
Why does Trail Turn Assist not activate
after unlocking the rear differential? The rear differential may not be fully
disengaged. When possible, turn off
the rear axle locker while driving
straight before using trail turn assist.
If you are already in a tight turn when
you encounter this situation, driving
the vehicle for a short distance in
reverse could allow the differential to
fully disengage.
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(If Equipped)

WHAT IS HILL DESCENT
CONTROL
Hill descent control allows the driver to set
and maintain vehicle speed while
descending steep slopes in various surface
conditions.
HOW DOES HILL DESCENT
CONTROL WORK
Hill descent control can maintain vehicle
speeds on downhill slopes between
2
– 20 mph (3– 32 km/h). Above 20 mph
(32 km/h), the system remains on but the
descent speed cannot be set or
maintained.
Note: The system does not function below
2 mph (3 km/h)
.
The system requires a cool down interval
after a period of sustained use. Hill descent
control provides a warning in the message
center and a tone sounds when the system
is about to disengage for cooling. At this
time, manually apply the brakes as needed
to maintain descent speed.
Note: The amount of time that the system
can remain active before cooling varies with
conditions.
HILL DESCENT CONTROL
PRECAUTIONS WARNING:
The system does not
control speed in low traction conditions
or extremely steep slopes. The system
is designed to be an aid and does not
relieve you of your responsibility to drive
with due care and attention. Failure to
follow this instruction could result in
personal injury. WARNING:
Hill descent control
cannot control descent in all surface
conditions and circumstances, such as
ice or extremely steep grades. Hill
descent control is a driver assist system
and cannot substitute for good judgment
by the driver. Failure to do so may result
in loss of vehicle control, crash or serious
injury. WARNING:
The system does not
replace the parking brake. When you
leave your vehicle, always apply the
parking brake and shift the transmission
into park (P) for automatic transmission
or first gear for manual transmission.
SWITCHING HILL DESCENT
CONTROL ON AND OFF Press the button on the
instrument panel. A light
illuminates and a tone sounds
when the system is active.
SETTING THE HILL DESCENT
SPEED
To increase or decrease the descent speed,
press the accelerator or brake pedal, or use
the SET
+ and SET - buttons on the
steering wheel. Once you reach the
preferred speed remove your feet from the
pedals.
HILL DESCENT CONTROL
INDICATOR Illuminates when you switch hill
descent control on.
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HILL DESCENT CONTROL – TROUBLESHOOTING
HILL DESCENT CONTROL – INFORMATION MESSAGES
Action
Message
Your vehicle speed requirement for off-road modeentry has not been met.
For Hill Descent Reduce Speed
XX MPH/km/h or Less
You need to select a transmission gear for hill descentmode.
For Hill Descent Select Gear
Hill descent control mode is deactivated and you mustresume control.
Hill Descent Driver Resume
Control
A hill descent system fault is present.
Hill Descent Control Fault
The hill descent system is cooling due to overuse.
Hill Descent Control Off System
Cooling
The hill descent system cannot activate while CruiseControl is actively controlling speed.
Hill Descent Control not avail-
able with Cruise Control Active
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ELECTRIC POWER STEERING
ELECTRIC POWER STEERING
PRECAUTIONS
WARNING: The electric power
steering system has diagnostic checks
that continuously monitor the system. If
a fault is detected, a message displays
in the information display. Stop your
vehicle as soon as it is safe to do so.
Switch the vehicle off. After at least 10
seconds, switch the vehicle on and
watch the information display for a
steering system warning message. If a
steering system warning message
returns, have the system checked as
soon as possible. WARNING:
If the system detects
an error, you may not feel a difference in
the steering, however a serious condition
may exist. Have your vehicle checked as
soon as possible. Failure to do so may
result in loss of steering control.
Adapt your speed and driving behavior
according to reduced steering assist.
Extreme continuous steering may increase
the effort to steer. This occurs to prevent
internal overheating and damage to the
steering system. If this occurs, you will not
lose the ability to steer your vehicle
manually nor will it cause damage to the
system. Normal steering and driving allows
the system to cool down and steering
assist returns to normal.
Note: There is no fluid reservoir to check or
fill. ELECTRIC POWER STEERING
ADAPTIVE STEERING
(If Equipped)
The adaptive steering system changes the
steering ratio with changes to vehicle
speed, optimizing the steering response in
all conditions. The system also changes
when you switch on the transmission
tow/haul feature. When you select the
tow/haul button, the adaptive steering
system reduces vehicle sensitivity to
steering inputs at higher vehicle speeds,
while maintaining the ease of parking and
maneuverability at low speeds.
Note: The adaptive steering system
continuously monitors for faults. If the
system detects a fault, a message appears
in the information display. If a red warning
message displays, stop your vehicle as soon
as it is safe to do so. The message could
clear if the fault is no longer present. If an
adaptive steering system warning message
appears each time you start your vehicle,
have the system checked as soon as
possible.
Note: The system has a locking device. It
remains mechanically locked at a fixed
steering ratio with the lock engaged. You
may notice a click when you turn your
vehicle on or off.
Note: If your vehicle loses electrical power
or detects a fault when you are driving, the
system shuts down and you retain a normal
steering function with a fixed steering ratio.
During this time, it is possible that the
steering wheel could not be straight when
the vehicle is driving straight ahead. In
addition, you could notice that the steering
wheel angle required to steer your vehicle
could be different.
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Note:
During parking maneuvers, the
adaptive steering system balances the driver
workload for various steering wheel inputs
and vehicle loading conditions. Under
extreme operating conditions the system
locking device could engage. This strategy
prevents overheating and permanent
damage to the adaptive steering system.
Typical steering and driving maneuvers
allow the system to cool and return to
normal operation.
Adaptive Learning
Adaptive learning helps correct road
irregularities and improves overall handling
and steering. It communicates with the
brake system to help operate advanced
stability control and crash avoidance
systems. Additionally, whenever you
disconnect the battery or install a new
battery, you must drive your vehicle a short
distance before the system relearns the
strategy and reactivates all systems. STEERING –
TROUBLESHOOTING
STEERING – WARNING
INDICATORS The adaptive steering system
indicator illuminates if the
system detects a fault during the
continuous diagnostic checks.
Note: If a red warning message displays,
stop your vehicle as soon as it is safe to do
so.
STEERING – INFORMATION MESSAGES Action
Message
The power steering system has detected acondition that requires service. Have your vehicle checked as soon as possible.
Steering Fault Service Now
The power steering system is not working.
Stop your vehicle in a safe place. Have your vehicle checked as soon as possible.
Steering Loss Stop Safely
The power steering system has detected acondition that requires service. Have your vehicle checked as soon as possible.
Steering Assist Fault Service Required
The steering system has detected a condi-
tion that requires service. Have your vehiclechecked as soon as possible.
Steering Lock Malfunction Service Now
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PARKING AID PRECAUTIONS
WARNING: To help avoid personal
injury, always use caution when in
reverse (R) and when using the sensing
system. WARNING:
The system may not
detect objects with surfaces that absorb
reflection. Always drive with due care
and attention. Failure to take care may
result in a crash. WARNING: Traffic control systems,
fluorescent lamps, inclement weather,
air brakes, external motors and fans may
affect the correct operation of the
sensing system. This may cause reduced
performance or false alerts. WARNING:
The system may not
detect small or moving objects,
particularly those close to the ground. WARNING:
The parking aid system
can only assist you to detect objects
when your vehicle is moving at parking
speeds. To help avoid personal injury you
must take care when using the parking
aid system. WARNING:
The system may not
function if the sensor is blocked. WARNING:
In cold and severe
weather conditions the system may not
function. Rain, snow and spray can all
limit sensor performance. WARNING:
If damage occurs in the
immediate area surrounding the sensor,
have your vehicle checked as soon as
possible. Note:
If your vehicle sustains damage
leaving the sensors misaligned, this will
cause inaccurate measurements or false
alerts.
When you connect a trailer to your vehicle,
the rear parking aid detects the trailer and
provides an alert. Disable the parking aid
when you connect a trailer to prevent the
alert.
Note: Certain add-on devices installed
around the bumper or fascia may create
false alerts, for example, large trailer
hitches, bike or surfboard racks, license plate
brackets, bumper covers or any other device
that could block the normal detection zone
of the parking aid system. Aftermarket spare
tires or spare tire covers mounted to the rear
tailgate could cause false alerts from the
park aid system. Remove the add-on device
to prevent false alerts.
Note: Keep the sensors free from snow, ice
and large accumulations of dirt. If the
sensors are covered, the system's accuracy
can be affected.
Do not clean the sensors with sharp
objects.
Note: When using a programmed MyKey,
you cannot switch the parking aids off. See
MyKey ™
(page 98).
REAR PARKING AID
(IF EQUIPPED)
WHAT IS THE REAR PARKING AID
Rear parking sensors detect objects behind
your vehicle when in reverse (R).
REAR PARKING AID LIMITATIONS
There is a decreased coverage area at the
outer corners.
When using a programmed MyKey, you
cannot switch the rear parking aid off.
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(If Equipped)

The rear parking aid sensors are active
when your vehicle is in reverse (R) and the
vehicle speed is less than 5 mph (8 km/h).
The sensor coverage area is up to
71 in
(180 cm) from the rear bumper.
The rear parking aid detects large objects
when you shift into reverse (R) and any of
the following occur:
• Your vehicle is moving backward at a
low speed.
• Your vehicle is stationary but an object
is approaching the rear of your vehicle
at a low speed.
• Your vehicle is moving backward at a
low speed and an object is moving
towards your vehicle, for example
another vehicle at a low speed.
LOCATING THE REAR PARKING
AID SENSORS The rear parking aid sensors are in the rear
bumper. REAR PARKING AID AUDIBLE
WARNINGS
A warning tone sounds when your vehicle
approaches an object. As your vehicle
moves closer to an object, the rate of the
tone increases. The warning tone
continuously sounds when an object is 12 in
(30 cm)
or less from the rear bumper.
If your vehicle remains stationary for a few
seconds, the audible warning turns off. If
your vehicle moves backward the tone
sounds again.
Note: When the parking aid system sounds
a tone, the audio system could reduce the
set volume.
FRONT PARKING AID (IF EQUIPPED)
WHAT IS THE FRONT PARKING
AID
Front parking sensors detect objects in
front of your vehicle.
FRONT PARKING AID
LIMITATIONS
The front parking aid sensors are active
when your vehicle is in any position other
than park (P) and the vehicle speed is less
than
5 mph (8 km/h).
The sensor coverage area is up to
28 in
(70 cm) from the bumper.
If your vehicle is in reverse (R), the front
parking aid detects objects when your
vehicle is moving at a low speed or an
object is moving toward your vehicle and
provides an audio warning, for example
another vehicle at a low speed. Once your
vehicle reaches a stop, the audio warning
stops after a few seconds. Visual indication
is always active in reverse (R).
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If your vehicle is in any forward gear, the
front parking aid provides audible warnings
and visual indication when your vehicle is
moving at a speed of 5 mph (8 km/h) or
below and the system detects an object
within the detection zone. Once your
vehicle reaches a stop, the visual indication
and audio warning stops after a few
seconds.
If your vehicle is in neutral (N), the front
and rear sensors provide visual indication
only when your vehicle is moving below a
speed of
5 mph (8 km/h) and obstacles
are detected inside the detection areas.
Once your vehicle stops, the visual
indication and audio warning stops after
a few seconds.
LOCATING THE FRONT PARKING
AID SENSORS The front parking aid sensors are in the
front bumper.
FRONT PARKING AID AUDIBLE
WARNINGS
A warning tone sounds when there is an
object within
28 in (70 cm) from the front
bumper. As your vehicle moves closer to
an object, the rate of the tone increases. The warning tone continuously sounds
when an object is 12 in (30 cm) or less from
the front bumper.
Note:
If the detected object is 12 in (30 cm)
or less from your vehicle, visual indication
remains on.
SIDE PARKING AID
(IF EQUIPPED)
WHAT IS THE SIDE PARKING AID
The front and rear outermost parking aid
sensors map objects that are near to the
sides of your vehicle.
SIDE PARKING AID LIMITATIONS
The sensor coverage is up to 24 in (60 cm)
from the sides of your vehicle.
The side parking aid may not function if:
• Your vehicle remains stationary for over
two minutes.
• The anti-lock brake system activates.
• The traction control system activates.
• Your vehicle is in park (P).
• The steering wheel angle information
is not available. You must drive at least
492 ft (150 m)
above 19 mph
(30 km/h) to reset the steering wheel
angle information.
Note: If you switch traction control off, the
side sensing system also turns off.
To reinitialize the system, drive the length
of your vehicle.
The side parking aid does not detect an
object that is moving toward the side of
your vehicle, for example another vehicle
moving at a low speed, if it does not pass
a front or rear parking aid sensor.
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