• Your vehicle speed falls below 12 mph
(20 km/h).
• You set a new gap distance.
The system applies the brakes to slow your
vehicle to maintain a safe gap distance
from the vehicle in front. The system only
applies limited braking. You can override
the system by applying the brakes.
If the system determines that its maximum
braking level is not sufficient, an audible
warning sounds, a message appears in the
information display and an indicator
flashes when the system continues to
brake. Take immediate action.
Setting the Gap Distance
You can decrease or increase the distance
between your vehicle and the vehicle in
front by pressing the gap control.
There are four gap settings from shortest
to longest.
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Press and release to decrease
the gap distance.
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Press and release to increase the
gap distance.
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The selected gap appears in the
information display as shown by the bars
in the image.
Each time you switch the system on, it
selects the last chosen gap setting.Note:The gap setting is time dependent
and therefore the distance adjusts with your
vehicle speed.
Note:It is your responsibility to select a gap
appropriate to the driving conditions.
Overriding the Set Speed
WARNING: If you override the
system by pressing the accelerator
pedal, it does not automatically apply
the brakes to maintain a gap from any
vehicle ahead.
When you press the accelerator pedal, you
override the set speed and gap distance.
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Use the accelerator pedal
normally to intentionally exceed
the set speed limit.
When you override the system, the green
indicator light illuminates and the vehicle
image does not appear in the information
display.
The system tunes the engine, transmission
controls and the stability and traction
control modes to normal mode. The
vehicle speed decreases to the set speed,
or a lower speed if following a slower
vehicle.
Changing the Set Speed
Press and release to increase the
set speed in small increments.
Press and release to decrease
the set speed in small
increments.
Press and hold either button to change the
set speed in large increments. Release the
button when the set speed has reached
the desired speed.
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Cruise Control - Vehicles With: Adaptive Cruise Control
The system may apply the brakes to slow
the vehicle to the new set speed. The set
speed displays continuously in the
information display when the system is
active.
Canceling the Set Speed
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Press and release the button or
tap the brake pedal.
The set speed does not erase.
Resuming the Set Speed
Press and release the button.
Your vehicle speed returns to the
previously set speed and gap setting. The
set speed displays continuously in the
information display when the system is
active.
Note:Only use resume if you are aware of
the set speed and intend to return to it.
Automatic Cancellation
The system is not functional at vehicle
speeds below 12 mph (20 km/h). An
audible alarm sounds and the automatic
braking releases if the vehicle drops below
this speed.
Automatic cancellation can occur when
the tires lose traction or you apply the
parking brake.
Note:If your vehicle speed drops too low,
an audible warning sounds and a message
appears in the information display.
Automatic braking releases.
Hilly Condition and Trailer Tow
Usage
You should select a lower gear when the
system is active in situations such as
prolonged downhill driving on steep
grades, for example in mountainous areas.
The system needs additional engine
braking in these situations to reduce the
load on the vehicle’s regular brake system
to prevent it from overheating.
Note:An audible alarm sounds and the
system shuts down if it applies brakes for
an extended period of time. This allows the
brakes to cool. The system functions
normally again after the brakes cool.
Note:When towing with adaptive cruise
control, switch on Diesel engine brake.
Switching Adaptive Cruise Control
Off
E265297
Press and release the button
when the system is in standby
mode, or switch the ignition off.
Note:The set speed and gap setting is
erased when you switch the system off.
Detection Issues
WARNING: On rare occasions,
detection issues can occur due to the
road infrastructures, for example bridges,
tunnels and safety barriers. In these
cases, the system may brake late or
unexpectedly. At all times, you are
responsible for controlling your vehicle,
supervising the system and intervening,
if required.
WARNING: If the system
malfunctions, have your vehicle checked
as soon as possible.
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Cruise Control - Vehicles With: Adaptive Cruise Control
WHAT IS CRUISE CONTROL
Cruise control lets you maintain a set
speed without keeping your foot on the
accelerator pedal.
Requirements
Use cruise control when the vehicle speed
is greater than 20 mph (30 km/h).
SWITCHING CRUISE CONTROL
ON AND OFF
WARNING: Do not use cruise
control on winding roads, in heavy traffic
or when the road surface is slippery. This
could result in loss of vehicle control,
serious injury or death.
The cruise controls are on the steering
wheel. See Cruise Control (page 51).
Switching Cruise Control On
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Press the button.
Switching Cruise Control Off
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Press the button when the
system is in standby mode.
The system also turns off when you switch
the ignition off.
Note:The set speed erases when you
switch the system off.
SETTING THE CRUISE
CONTROL SPEED
WARNING: When you are going
downhill, your vehicle speed could
increase above the set speed. The
system does not apply the brakes.
Drive to the speed you prefer.
Press either button to set the
current speed.
Take your foot off the accelerator pedal.
Note:The indicator changes color in the
information display.
Changing the Set Speed
Press and release the button to
increase the set speed in small
increments.
Press and hold the button to accelerate.
Release the button when you reach your
preferred speed.
Press and release the button to
decrease the set speed in small
increments.
Press and hold the button to decelerate.
Release the button when you reach your
preferred speed.
Note: If you accelerate by pressing the
accelerator pedal, the set speed does not
change. When you release the accelerator
pedal, your vehicle returns to the speed that
you previously set.
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Cruise Control - Vehicles With: Cruise Control
Note:A high crown in the road or high
crosswinds may also make the steering
seem to wander or pull.
PRE-COLLISION ASSIST -
VEHICLES WITH: AIR BRAKES
(IF EQUIPPED)
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, pedestrians, 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 is not
designed to detect non-metallic objects
and does not reliably detect some
objects with limited metallic surfaces.
For example, recreational vehicles,
motorcycles and guard rails. 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: Some situations and
objects prevent hazard detection. For
example low or direct sunlight, inclement
weather, unconventional vehicle types,
and pedestrians. 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 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.
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: 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.
Using the Pre-Collision Assist
System
If your vehicle is approaching a stationary
vehicle in your lane of travel, the system
provides an Alert. Stationary vehicle
detection is active at speeds above
approximately 10 mph (16 km/h).
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168
Driving Aids
Radar Troubleshooting
Action Cause
Clean the grille surface in front of the radar
or remove the object causing the obstruc-
tion. The surface of the radar in the grille is dirty
or obstructed in some way.
Wait a short time. It may take several
minutes for the radar to detect that there
is no obstruction. The surface of the radar in the grille is clean
but the message remains in the display
screen.
The Pre-Collision Assist system is tempor-
arily disabled. Pre-Collision Assist automat-
ically reactivates a short time after the
weather conditions improve. Heavy rain, spray, snow or fog is interfering
with the radar signals.
The Pre-Collision Assist system is tempor-
arily disabled. Pre-Collision Assist automat-
ically reactivates a short time after the
weather conditions improve. Swirling water or snow or ice on the surface
of the road may interfere with the radar
signals.
Contact an authorized dealer to have the
radar checked for proper coverage and
operation. Radar is out of alignment due to a front end
impact.
Note:If something hits the front end of your
vehicle or damage occurs and your vehicle
has a radar sensor, the radar sensing zone
may change. This could cause missed or
false vehicle detections. Contact an
authorized dealer to have the radar checked
for proper coverage and operation.
PRE-COLLISION ASSIST -
VEHICLES WITH: HYDRAULIC
BRAKES
(IF EQUIPPED)
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.
170
Driving Aids
WARNING: The system does not
detect vehicles that are driving in a
different direction, pedestrians, 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.
WARNING: Some situations and
objects prevent hazard detection. For
example low or direct sunlight, inclement
weather, unconventional vehicle types,
and pedestrians. 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 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: 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.
Using the Pre-Collision Assist
System
The Pre-Collision Assist system is active
at speeds above approximately 3 mph
(5 km/h).
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If your vehicle is rapidly approaching
another stationary vehicle or a vehicle
traveling in the same direction the system
provides three levels of functionality:
1. Alert
2. Brake Support
3. Active Braking
55 68E255268
Alert: When active, a flashing visual
warning appears and an audible warning
tone sounds.
171
Driving Aids
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.
Active Braking: Active braking may
activate if the system determines that a
collision is imminent. The system may help
the driver reduce impact damage or avoid
the crash completely.
Note:If you perceive Pre-Collision Assist
alerts as being too frequent or disturbing,
then you can reduce the alert sensitivity,
though the manufacturer recommends
using the highest sensitivity setting where
possible. Setting lower sensitivity would
lead to fewer and later system warnings.
Distance Indication and Alert
Distance Indication and Alert is a function
that provides the driver with a graphical
indication of the time gap to other
preceding vehicles traveling in the same
direction. The Distance Indication and Alert
screen in the display screen shows one of
the graphics that follow.
E254791E254791
If the time gap to a preceding vehicle is
small, a red visual indication displays.
Note:Distance Indication and Alert
deactivates and the graphics do not display
when Adaptive Cruise Control is active.
Adjusting the Pre-Collision Assist
Settings
You can adjust the following settings by
using the information display controls. See
General Information (page 70).
• You can change Alert and Distance
Alert sensitivity to one of three possible
settings.
• You can switch Distance Indication and
Alert on or off.
• If required, you can switch Active
Braking on or off.
• If required, you can switch the entire
Pre-Collision Assist feature on or off.
Note:Active braking automatically turns
on every time you switch the ignition on.
172
Driving Aids
AIR SUSPENSION
Note:Do not operate your vehicle without
air in the suspension springs. Operating your
vehicle without air in the suspension springs
damages the suspension, degrades ride
performance and may cause property
damage.
The air suspension system automatically
adjusts to different loads to maintain a
constant frame height, allows for ease of
vehicle loading, provides improved vehicle
ride, and increased driver comfort.
Air Suspension Dump Button
E213409
Note:The suspension dumps air when the
ignition is in the accessory or on position,
but fills only when the ignition is in the on
position.
A button located on the instrument panel
controls the system. It operates only when
the ignition is in the accessory or on
position and the air tanks have sufficient
pressure to fill the air springs. When you
turn off the ignition, the suspension
remains in whatever state it was last set.
Pressing and holding the button for two
seconds exhausts air from the air springs,
lowering the frame for loading. Pressing
and holding the button for two seconds
fills the air springs so your vehicle remains
at normal ride height.
System Indicator Light
The air suspension indicator light
illuminates when using the button to
release air pressure in the rear air springs.
Never drive your vehicle when the warning
lamp is illuminated and there is low (or no)
air pressure in the springs.
Connecting and Disconnecting a
Trailer with Air Suspension and Air
Suspension Dump Button
When connecting to a trailer:
• Press and hold the button for two
seconds to exhaust air from the air
suspension system.
• Press and hold the button for two
seconds, and then raise the landing
gear after making the connection to
the trailer.
When disconnecting the trailer:
• Lower the landing gear, and then press
and hold the button for two seconds.
• Disconnect the brake hoses, trailer-side
and rear light connectors, then pull the
release lever on the fifth wheel.
You must fill the air springs before
operating with a trailer or operating in the
bobtail mode.
Suspension Conversions
WARNING: When operating a
loaded vehicle, the driver must keep all
adjustable axles on the ground at all
times, supporting their share of the
vehicle’s load. Failure to do so can
overload other axles, tires, wheels,
springs, steering components, brakes
and frames, resulting in early component
failure, loss of vehicle control, possible
property damage and personal injury.
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Load Carrying