warning light FORD F-150 2021 Service Manual

LANE KEEPING SYSTEM – FREQUENTLY ASKED QUESTIONS
Why is the feature not available (lane markings are gray) when I can see the lane markings
on the road?
Your vehicle speed is less than 40 mph (65 km/h).
The sun is shining directly into the camera lens. A quick intentional lane change has occurred.
Your vehicle stays too close to the lane markings for an extended interval of time. Driving at high speeds in curves.
The last alert warning or aid intervention occurred a short time ago. Ambiguous lane markings, for example, in construction zones. Rapid transition from light to dark, or from dark to light. Sudden offset in lane markings.
ABS or AdvanceTrac ™ is active.
There is a camera blockage due to dirt, grime, fog, frost or water on the windshield. You are driving too close to the vehicle in front of you.
Transitioning between no lane markings to lane markings, or vice versa. There is standing water on the road.
Faint lane markings, for example, partial yellow lane markings on concrete roads. Lane width is too narrow or too wide.
You have not calibrated the camera after a windshield replacement. Driving on tight or on uneven roads.
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F-150 (TFD) Canada/United States of America, enUSA, Edition date: 202104, Second-Printing Lane Keeping System
(If Equipped)

Note:
If the trailer is a bike rack or cargo
rack with electrical lighting, enter a length
of 3 ft (1 m). Cross traffic alert remains on
for trailers with a length of 3 ft (1 m) or less.
Note: The system requires proper
measurement and measure entry to function
properly.
SELECTING A TRAILER
When you connect a trailer to your vehicle,
the trailer set up menu appears in the
touchscreen. This menu allows you to set
up a new trailer or choose from a
previously set up trailer. A warning
message appears and the system turns off
if you do not choose or add a new trailer.
Note: The warning message may not
appear until your vehicle reaches
22 mph
(35 km/h). BLIND SPOT INFORMATION
SYSTEM INDICATORS When blind spot information
system detects a vehicle, an
alert indicator illuminates in the
exterior mirror on the side the approaching
vehicle is coming from. If you turn the turn
signal on for that side of your vehicle, the
alert indicator flashes.
BLIND SPOT INFORMATION SYSTEM – TROUBLESHOOTING
BLIND SPOT INFORMATION SYSTEM – INFORMATION MESSAGES Action
Message
A fault with the system has occurred. Haveyour vehicle checked as soon as possible.
Blind Spot System Fault
Something is blocking the sensors. Cleanthe sensors.
Blind Spot Not Available Sensor Blocked
See Manual
The system automatically turns off and
displays this message when you connect a trailer to the vehicle that does not have a
trailer blind spot system or when you switch
the trailer blind spot system off through the touchscreen.
Blind Spot Alert Deactivated Trailer
Attached
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(If Equipped)E309137 E249861E249861

WHAT IS PRE-COLLISION
ASSIST
Pre-collision assist detects and warns of
approaching hazards in the roadway. If
your vehicle is rapidly approaching another
stationary vehicle, a vehicle traveling in the
same direction as yours, or a pedestrian
within your driving path, the system
provides multiple levels of assistance to
help avoid a collision.
HOW DOES PRE-COLLISION
ASSIST WORK
The system warns the driver of potential
hazards by providing three levels of
assistance.
If your vehicle is rapidly approaching
potential hazards the system provides the
following levels of functionality:
1. Alert.
2. Brake Support.
3. Automatic Emergency Braking.
Alert: When active, a flashing
visual warning appears and an
audible warning tone sounds.
Brake Support
: The system is designed
to help reduce the impact speed by
preparing the brakes for rapid braking. The
system does not automatically apply the
brakes. If you press the brake pedal, the
system could apply additional braking up
to maximum braking force, even if you
lightly press the brake pedal.
Automatic Emergency Braking
:
Automatic emergency braking may
activate if the system determines that a
collision is imminent. Note:
If you perceive pre-collision assist
alerts as being too frequent or disturbing,
then you can reduce the alert sensitivity,
although the manufacturer recommends
using the highest sensitivity setting where
possible. Setting lower sensitivity would
lead to fewer and later system warnings.
Each system has various levels of
detection capabilities. See Pre-Collision
Assist Limitations
(page 397).
PRE-COLLISION ASSIST
PRECAUTIONS WARNING: You are responsible for
controlling your vehicle at all times. 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
the loss of control of your vehicle,
personal injury or death. WARNING:
The system does not
detect vehicles that are driving in a
different direction, cyclists or animals.
Apply the brakes when necessary. Failure
to follow this instruction could result in
the loss of control of your vehicle,
personal injury or death. WARNING:
The system does not
operate during hard acceleration or
steering. Failure to take care may lead
to a crash or personal injury. WARNING: The system may fail or
operate with reduced function during
cold and severe weather conditions.
Snow, ice, rain, spray and fog can
adversely affect the system. Keep the
front camera and radar free of snow and
ice. Failure to take care may result in the
loss of control of your vehicle, serious
personal injury or death.
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(If Equipped)E156130 E329466

WARNING: Take additional care if
your vehicle is heavily loaded or you are
towing a trailer. These conditions could
result in reduced performance of this
system. Failure to follow this instruction
could result in the loss of control of your
vehicle, personal injury or death. WARNING:
The system cannot
help prevent all crashes. Do not rely on
this system to replace driver judgment
and the need to maintain a safe distance
and speed. WARNING:
In situations where the
vehicle camera has limited detection
capability, this may reduce system
performance. These situations include
but are not limited to direct or low
sunlight, vehicles at night without tail
lights, unconventional vehicle types,
pedestrians with complex backgrounds,
running pedestrians, partly obscured
pedestrians, or pedestrians that the
system cannot distinguish from a group.
Failure to take care may result in the loss
of control of your vehicle, serious
personal injury or death.
PRE-COLLISION ASSIST
LIMITATIONS - POLICE
RESPONDER
Pre-collision assist depends on the
detection ability of its camera and sensors.
Any obstructions or damage to these areas
can limit detection or prevent the system
from functioning. See
Locating the
Pre-Collision Assist Sensors (page 399).
The system is active at speeds above
3 mph (5 km/h)
. Note:
The pre-collision assist system
automatically disables when you select
four-wheel drive low, manually disable
AdvanceTrac ™, or select rock crawl mode.
Note: Brake support and automatic
emergency braking are active at speeds up
to
75 mph (120 km/h).
Pedestrian Detection Limitations
Pedestrian detection is active at speeds
up to
50 mph (80 km/h).
Pedestrian detection operates optimally
when detected hazards are clearly
identifiable. System performance may
reduce in situations where pedestrians are
running, partly obscured, have a complex
background, or cannot be distinguished
from a group.
PRE-COLLISION ASSIST
LIMITATIONS
Pre-collision assist depends on the
detection ability of its camera and sensors.
Any obstructions or damage to these areas
can limit detection or prevent the system
from functioning. See
Locating the
Pre-Collision Assist Sensors (page 399).
The system is active at speeds above
3 mph (5 km/h)
.
Note: The pre-collision assist system
automatically disables when you select
four-wheel drive low, manually disable
AdvanceTrac ™, or select rock crawl mode.
Note: Brake support and automatic
emergency braking are active at speeds up
to 80 mph (130 km/h). If your vehicle has a
radar sensor included with adaptive cruise
control, then brake support and automatic
emergency braking are active up to the
maximum speed of your vehicle.
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F-150 (TFD) Canada/United States of America, enUSA, Edition date: 202104, Second-Printing Pre-Collision Assist
(If Equipped)

When the trailer disconnects in this state,
the vehicle alarm sounds, and the system
sends an alert to your FordPass app.
Note:
For reliable trailer detection, the
trailer ’s lamps must be SAE certified for
each intended purpose.
Note: If the trailer is not compatible with
the feature, the turn signals flash twice.
Switching the Trailer Connection
Alarm On and Off
1. Press Features on the touchscreen.
2. Press
Towing.
3. Press
Manage trailers.
4. Press the currently active trailer's name.
5. Switch
Trailer Connection
Notification on or off.
Note: The alarm disables by default and if
the system detects a trailer it can be
configurable.
Note: Settings are applicable only for the
selected trailer profile. TRAILER LIGHTING CHECK WARNING:
Never connect any
trailer lamp wiring to the vehicle's tail
lamp wiring; this may damage the
electrical system resulting in fire. Contact
your authorized dealer as soon as
possible for assistance in proper trailer
tow wiring installation. Additional
electrical equipment may be required.
Perform a trailer light illumination
sequence to confirm that all lights are
functioning by using the FordPass app or
the vehicle's touchscreen.
Performing the Trailer Lighting
Check Using the Touchscreen
1. Press
Features on the touchscreen.
2. Press
Towing.
3. Press
Trailer Light Check.
4. Press
Start.
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F-150 (TFD) Canada/United States of America, enUSA, Edition date: 202104, Second-Printing Connecting a Trailer

TOWING A TRAILER – TROUBLESHOOTING
TOWING A TRAILER – INFORMATION MESSAGES
Details
Message
The left-hand trailer turn lamp requiresservice.
Trailer Left Turn Lamps Fault Check Lamps
The right-hand trailer turn lamp requiresservice.
Trailer Right Turn Lamps Fault Check
Lamps
The trailer battery voltage is too low to
charge. If there is no trailer attached, the vehicle battery voltage is low.
Trailer Battery Not Charging See Manual
The system detects a short created by thetrailer lamps. Inspect and repair the trailer
wiring, or have the system checked as soon as possible.
Trailer Lighting Module Fault See Manual
The trailer stoplamps require service.
Trailer Stop Lamps Fault Check Lamps
The trailer sway control detects trailersway. Reduce the vehicle's speed.
Trailer Sway Reduce Speed
Displays when one or more tires on the
trailer is above the recommended temper- ature.
Trailer Tire Over Temperature
One or more tires on your trailer is belowthe specified tire pressure.
Trailer Tire Low Specified:
A trailer tire pressure sensor requires
service. If the warning stays on or continues to come on, have the system checked as soon as possible.
Trailer Tire Pressure Sensor Fault
The trailer tire pressure monitoring systemrequires service. If the warning stays on or continues to come on, have the system checked as soon as possible.
Trailer Tire Pressure Monitor Fault
The system cannot detect the trailer tirepressure monitoring system.
Trailer Tire Pressure Monitor Capability Not
Detected
The trailer tire pressure monitoring systemis not setup.
Trailer Tire Pressure Indication Not Setup
See Manual
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F-150 (TFD) Canada/United States of America, enUSA, Edition date: 202104, Second-Printing Towing a Trailer

WHAT IS TRAILER HITCHING
ASSISTANCE
Trailer hitching assistance helps the driver
align the vehicle hitch ball to a trailer
coupler.
HOW DOES TRAILER HITCHING
ASSISTANCE WORK
Trailer hitching assistance uses the
following to detect your trailer:
•
Rear view camera.
• Radar.
• Parking aid sensors.
• External rear lighting.
This feature also controls the following to
align the hitch ball with the trailer coupler:
• Steering.
• Shifting.
• Braking and acceleration.
Note: Blocked sensors could affect system
performance. Do not cover the sensors with
bumper stickers, tape, repair compound or
other objects.
TRAILER HITCHING
ASSISTANCE PRECAUTIONS WARNING: You are responsible for
controlling your vehicle at all times. 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
the loss of control of your vehicle,
personal injury or death. WARNING: The system is not
designed to detect cyclists,
motorcyclists, pedestrians or animals.
Apply the brakes when necessary. Failure
to follow this instruction could result
personal injury or death. WARNING:
The system may not
operate properly during severe weather
conditions, for example snow, ice, heavy
rain and spray. Always drive with due
care and attention. Failure to take care
may result in a crash.
Note: Trailer hitching assistance only works
with conventional trailers, couplers and
hitch balls.
Note: The hitch ball must be properly
installed on the vehicle for the system to
function as intended. An improperly
installed hitch ball could result in damage
to your vehicle or trailer.
Note: Certain aftermarket modifications
such as oversized tires or lift kits could make
trailer hitching assistance fail or not work
as intended.
Note: Keep the sensors and camera free
from snow, ice and dirt.
Note: Clean the camera lens with a soft,
lint-free cloth and non-abrasive cleaner.
TRAILER HITCHING
ASSISTANCE LIMITATIONS
The system could not function or could
function with reduced performance during
the following:
• When using trailer hitching assistance
in tall grass and weeds.
• When safety chains, cables or wiring
are dangling near the coupler.
• When using trailer hitching assistance
on slippery surfaces.
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5. When with other vehicles, it is
recommended that communication is
used, and the lead vehicle notify other
vehicles of obstacles that could cause
potential vehicle damage.
6. Always keep available ground clearance in mind and pick a route that
minimizes the risk of catching the
underside of the vehicle on an obstacle.
7. When negotiating low speed obstacles,
applying light brake pressure in
conjunction with the throttle will help
prevent the vehicle from jerking and
will allow you to negotiate the obstacle
in a more controlled manner. Using 4L
will also help with this.
8. Off-roading requires a high degree of concentration. Even if your local law
does not prohibit alcohol use while
driving off-road, Ford strongly
recommends against drinking if you
plan to off-road.
Crossing Obstacles
• Review the path ahead before
attempting to cross any obstacle. It is
best if the obstacle is reviewed from
outside the vehicle so that there is a
good understanding of terrain condition
both in front of and behind the
obstacle.
• Approach obstacles slowly.
• If a large obstacle such as a rock
cannot be avoided, choose a path that
places the rock directly under the tire
rather than the undercarriage of the
vehicle. This will help prevent damage
to the vehicle.
• Ditches and washouts should be
crossed at a 45° angle, allowing each
wheel to independently cross the
obstacle. Hill Climbing WARNING:
Extreme care should
be used when steering the vehicle in
reverse down a slope so as not to cause
the vehicle to swerve out of control.
• Always attempt to climb a steep hill
along the fall line of the slope and not
diagonally.
• If the vehicle is unable to make it up
the hill, DO NOT attempt to turn back
down the slope. Place the vehicle in
low range and slowly back down in
reverse.
• When descending a steep slope, select
low gear and engage hill descent
control. Use the throttle and brake
pedals to control your descent speed.
Note: Hill descent control is functional in
reverse and should be used in this situation.
DRIVING OFF-ROAD - RAPTOR
Driving In Snow and Ice WARNING:
Do not become
overconfident in the ability of four-wheel
drive vehicles. Although a four-wheel
drive vehicle may accelerate better than
a two-wheel drive vehicle in low traction
situations, it won't stop any faster than
two-wheel drive vehicles. Always drive
at a safe speed.
Make sure you allow sufficient distance
between your vehicle and other vehicles
for stopping.
Driving In Sand
When driving over sand, try to keep all four
wheels on the most solid area of the trail.
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Driving In Mud
Be cautious of sudden changes in vehicle
speed or direction when you are driving in
mud.
After driving through mud, clean your
vehicle. Excess mud stuck on the wheels
and tires and rotating components can
cause an imbalance and result in damage.
Note:
The vehicle brakes are less effective
when wet or muddy.
Driving Over Rocks and Gravel
Never attempt to straddle a rock that is
large enough to strike your axles or
undercarriage.
Leave a generous gap between your
vehicle and other vehicles to minimize the
risk of damage. Avoid dust clouds as they
reduce visibility.
Climbing A Hill WARNING: Extreme care should
be used when steering the vehicle in
reverse down a slope so as not to cause
the vehicle to swerve out of control.
Do not drive over the crest of a hill without
seeing what conditions are on the other
side. Do not drive in reverse over a hill
without the aid of an observer.
Note: Avoid turning on steep slopes or hills.
A danger lies in losing traction, slipping
sideways and possible vehicle roll over.
Note: Too much acceleration can cause
the tires to slip, spin or lose traction,
resulting in loss of vehicle control. Driving Through Water WARNING:
Do not attempt to
cross a deep, fast flowing body of water.
Failure to follow this instruction could
result in the loss of control of your
vehicle, personal injury or death.
The key to a safe crossing is the water
depth, current and bottom of the water's
condition. On soft bottoms, the vehicle
sinks in, effectively increasing the water
level on the vehicle. Make sure to consider
this when determining the depth of water.
Determine the depth and speed of the
current before attempting a water crossing.
Be aware that obstacles and debris could
be beneath the water ’s surface.
Note: Cross flowing water at an angle
heading slightly upstream.
Note: Tread lightly and avoid damage to
the environment.
Water can cause permanent damage that
may not be covered by your vehicle
warranty. See
Driving Through Water
Limitations (page 474).
Note: Failure to follow the recommended
speeds can result in vehicle damage.
Muddy waters can reduce the cooling
system effectiveness by depositing debris
into the radiator.
High currents even in shallow water can
wash the dirt out from around your tires or
push your vehicle across slippery rocks or
surfaces.
Do not cross any body of water that is fast
flowing and rising.
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DRIVING THROUGH WATER
LIMITATIONS - RAPTOR
Maximum Wading
Depth
Model
32 in (810 mm)
All.
When you are driving though water do not
exceed 4 mph (7 km/h).
WATER WADING WARNING:
Do not attempt to
cross a deep, fast flowing body of water.
Failure to follow this instruction could
result in the loss of control of your
vehicle, personal injury or death.
As the water depth increases, you must
reduce your vehicle speed to avoid
potential vehicle damage. •
Always determine the depth before
attempting a water crossing. Never
drive through water that is higher than
the bottom of the wheel hubs.
• Slowly proceed and avoid splashing
water any more than is necessary. •
Be aware that obstacles and debris
may be beneath the water ’s surface.
• Keep the doors fully closed during the
water crossing.
• After driving through water and as soon
as it is safe to do so check the brakes,
horn, lights, and steering wheel to
confirm those systems are functioning
properly.
Note: Engine damage can occur if water
enters the air filter.
OFF-ROAD DRIVING AIDS -
RAPTOR
Selecting an Off-Road Drive Mode
Using the appropriate drive mode increases
your vehicle's control. See
Drive Mode
Control (page 371).
Using Four-Wheel Drive
Your vehicle has a four-wheel drive system
that offers various modes to help you
optimize traction on any off-road surface.
See
Four-Wheel Drive (page 291).
Using the Cameras Off-Road
Use the 360 degree camera to enhance
your off-road experience. See 360 Degree
Camera
(page 342).
Using the Rear Differential Lock
When engaged, the rear differential lock
provides additional traction to your vehicle
by forcing the two rear wheels to turn at
the same speed.
Note: Rear differential lock is only available
when the vehicle is in 4H or 4L. See
Electronic Locking Differential (page 301).
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