2020 Ram 2500 sensor

276STARTING AND OPERATING
(Continued)
(Continued)
NOTE:
If the sensor does not detect a vehicle ahead
of you, ACC will maintain a fixed set speed.
If the ACC sensor detects a vehicle ahead,
ACC will apply limited braking or accelerate
(not to exceed the original set speed) auto -
matically to maintain a preset following
distance, while matching the speed of the
vehicle ahead.
The Cruise Control system has two control
modes:
Adaptive Cruise Control mode for main -
taining an appropriate distance between
vehicles.
Normal (Fixed Speed) Cruise Control mode
for cruising at a constant preset speed. For
additional information, refer to “Normal
(Fixed Speed) Cruise Control Mode” in this
section.
NOTE:
Normal (Fixed Speed) Cruise Control will not
react to preceding vehicles. Always be aware of
the mode selected. You can change the mode by using the Cruise
Control buttons. The two control modes func
-
tion differently. Always confirm which mode is
selected.
WARNING!
Adaptive Cruise Control (ACC) is a conve -
nience system. It is not a substitute for
active driving involvement. It is always the
driver’s responsibility to be attentive of
road, traffic, and weather conditions,
vehicle speed, distance to the vehicle
ahead; and, most importantly, brake opera -
tion to ensure safe operation of the vehicle
under all road conditions. Your complete
attention is always required while driving to
maintain safe control of your vehicle.
Failure to follow these warnings can result
in a collision and death or serious personal
injury.
The ACC system:
Does not react to pedestrians,
oncoming vehicles, and stationary
objects (e.g., a stopped vehicle in a
traffic jam or a disabled vehicle).
Cannot take street, traffic, and weather conditions into account, and may be
limited upon adverse sight distance
conditions.
Does not always fully recognize complex driving conditions, which can
result in wrong or missing distance
warnings.
Will bring the vehicle to a complete stop while following a target vehicle and hold
the vehicle for approximately two
seconds in the stop position. At this
point, there will be an “ACC may cancel
soon” chime and warning to the driver.
When ACC is cancelled, the system will
release the brakes and the driver must
take over braking. The system can be
resumed when the target vehicle drives
off by releasing the brake and pushing
the resume button on the steering
wheel.
WARNING! (Continued)

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STARTING AND OPERATING281

Distance Setting 4 Bars (Longest)
Distance Setting 3 Bars (Long) Distance Setting 2 Bars (Medium)
Distance Setting 1 Bar (Short)

The system automatically defaults to the
longest distance setting. To decrease the
distance setting, push the Distance Button and
release. Each time the button is pushed, the
distance setting decreases by one bar. Once the
shortest setting is reached, if the button is pushed again it will reset to the default setting
(longest).
If there is no vehicle ahead, the vehicle will
maintain the set speed. If a slower moving
vehicle is detected in the same lane, the instru
-
ment cluster displays the ACC Set With Target
Indicator Light, and the system adjusts vehicle
speed automatically to maintain the distance
setting, regardless of the set speed.
The vehicle will then maintain the set distance
until:
The vehicle ahead accelerates to a speed
above the set speed.
The vehicle ahead moves out of your lane or
view of the sensor.
The distance setting is changed.
The system disengages. (Refer to “Activating
Adaptive Cruise Control (ACC)” in this
chapter.
The maximum braking applied by ACC is limited;
however, the driver can always apply the brakes
manually, if necessary.
5

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STARTING AND OPERATING283
Push the Adaptive Cruise Control (ACC) on/off
button (located on the steering wheel) until one
of the following appears in the instrument
cluster display:
Adaptive Cruise Control Off
When ACC is deactivated, the display will read
“Adaptive Cruise Control Off.”
Adaptive Cruise Control Ready
When ACC is activated, but the vehicle speed
setting has not been selected, the display will
read “Adaptive Cruise Control Ready.”
Adaptive Cruise Control Set
When the RES (+) or the SET(-) button (located
on the steering wheel) is pushed, the display will
read “ACC SET.”
When ACC is set, the set speed will show in the
instrument cluster display.
The ACC screen may display once again if any
ACC activity occurs, which may include any of
the following:
System Cancel
Driver Override
System Off
ACC Proximity Warning
ACC Unavailable Warning
The instrument cluster display will return to
the last display selected after five seconds of
no ACC display activity
Display Warnings And Maintenance
“Wipe Front Radar Sensor In Front Of
Vehicle” Warning
The “ACC/FCW Unavailable Wipe Front Radar
Sensor” warning will display and also a chime
will indicate when conditions temporarily limit
system performance.
This most often occurs at times of poor visibility,
such as in snow or heavy rain. The ACC system
may also become temporarily blinded due to
obstructions, such as mud, dirt or ice. In these
cases, the instrument cluster display will display
“ACC/FCW Unavailable Wipe Front Radar
Sensor” and the system will deactivate.
The “ACC/FCW Unavailable Wipe Front Radar
Sensor” message can sometimes be displayed
while driving in highly reflective areas (i.e.
tunnels with reflective tiles, or ice and snow).
The ACC system will recover after the vehicle has left these areas. Under rare conditions,
when the radar is not tracking any vehicles or
objects in its path this warning may temporarily
occur.
NOTE:
If the “ACC/FCW Unavailable Wipe Front Radar
Sensor” warning is active Normal (Fixed Speed)
Cruise Control is still available. For additional
information refer to “Normal (Fixed Speed)
Cruise Control Mode” in this section.
If weather conditions are not a factor, the driver
should examine the sensor. It may require
cleaning or removal of an obstruction. The
sensor is located in the camera in the center of
the windshield, on the forward side of the rear
-
view mirror.
To keep the ACC System operating properly, it is
important to note the following maintenance
items:
Always keep the sensor clean. Carefully clear
the windshield.
Do not remove any screws from the sensor.
Doing so could cause an ACC system
5

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284STARTING AND OPERATING
malfunction or failure and require a sensor
realignment.
Do not attach or install any accessories near
the sensor, including transparent material or
aftermarket grilles. Doing so could cause an
ACC system failure or malfunction.
When the condition that deactivated the system
is no longer present, the system will return to
the “Adaptive Cruise Control Off” state and will
resume function by simply reactivating it.
NOTE:
If the “ACC/FCW Unavailable Wipe Front
Radar Sensor” message occurs frequently
(e.g. more than once on every trip) without
any snow, rain, mud, or other obstruction,
have the radar sensor realigned at your
authorized dealer.
Installing a snow plow, front-end protector,
an aftermarket grille or modifying the grille is
not recommended. Doing so may block the
sensor and inhibit ACC/FCW operation.
“Clean Front Windshield” Warning
The “ACC/FCW Limited Functionality Clean
Front Windshield” warning will display and also
a chime will indicate when conditions tempo -rarily limit system performance. This most often
occurs at times of poor visibility, such as in
snow or heavy rain and fog. The ACC system
may also become temporarily blinded due to
obstructions, such as mud, dirt, or ice on wind
-
shield, driving directly into the sun and fog on
the inside of glass. In these cases, the instru -
ment cluster display will show “ACC/FCW
Limited Functionality Clean Front Windshield”
and the system will have degraded perfor -
mance.
The “ACC/FCW Limited Functionality Clean
Front Windshield” message can sometimes be
displayed while driving in adverse weather
conditions. The ACC/FCW system will recover
after the vehicle has left these areas. Under
rare conditions, when the camera is not
tracking any vehicles or objects in its path this
warning may temporarily occur.
If weather conditions are not a factor, the driver
should examine the windshield and the camera
located on the back side of the inside rearview
mirror. They may require cleaning or removal of
an obstruction.
When the condition that created limited func -
tionality is no longer present, the system will
return to full functionality. NOTE:
If the “ACC/FCW Limited Functionality Clean
Front Windshield” message occurs frequently
(e.g. more than once on every trip) without any
snow, rain, mud, or other obstruction, have the
windshield and forward facing camera
inspected at your authorized dealer.
Service ACC/FCW Warning
If the system turns off, and the instrument
cluster displays “ACC/FCW Unavailable Service
Required” or “Cruise/FCW Unavailable Service
Required”, there may be an internal system
fault or a temporary malfunction that limits ACC
functionality. Although the vehicle is still driv
-
able under normal conditions, ACC will be
temporarily unavailable. If this occurs, try acti -
vating ACC again later, following an ignition
cycle. If the problem persists, see your autho -
rized dealer.
Precautions While Driving With ACC
In certain driving situations, ACC may have
detection issues. In these cases, ACC may
brake late or unexpectedly. The driver needs to
stay alert and may need to intervene.

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290STARTING AND OPERATING
ParkSense Sensors
The four ParkSense sensors, located in the rear
fascia/bumper, monitor the area behind the
vehicle that is within the sensors’ field of view.
The sensors can detect obstacles from approxi -
mately 18 inches (45 cm) up to 79 inches (200
cm) from the rear fascia/bumper in the hori -
zontal direction, depending on the location, type
and orientation of the obstacle.
NOTE:
If equipped as a dually, the ParkSense system
has six rear sensors to assist in detection
around the dually flares.
ParkSense Warning Display
The ParkSense Warning screen is located within
the instrument cluster display. It provides visual
warnings to indicate the distance between the
rear fascia/bumper and the detected obstacle.
Refer to “Instrument Cluster Display” in
“Getting To Know Your Instrument Panel” for
further information.
ParkSense Display
When the vehicle is in REVERSE, the warning
display will turn on indicating the system status.
The system will indicate a detected obstacle by
showing a single arc in the left and/or right rear
regions based on the object’s distance and
location relative to the vehicle.
If an object is detected in the left and/or right
rear region, the display will show a single solid
arc in the left and/or right rear region and the
system will produce a tone. As the vehicle
moves closer to the object, the display will show
the single arc moving closer to the vehicle and
the tone will change from a single 1/2 second
tone to slow, to fast, to continuous.

Single 1/2 Second Tone Slow Tone
Slow Tone

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292STARTING AND OPERATING
Adjustable Chime Volume Settings
The rear chime volume settings are program -
mable through the Uconnect system. Refer to
“Uconnect Settings” in “Multimedia” for further
information.
The chime volume settings include low,
medium, and high. The factory default volume is
medium.
Enabling And Disabling ParkSense
ParkSense can be enabled and disabled with
the ParkSense switch.
When the gear selector is moved to
REVERSE and the system is disabled,
the instrument cluster display will
show the vehicle graphic with “Off”
over the arcs for as long as the vehicle is in
REVERSE.
NOTE:
The ParkSense system will automatically
disable when the system detects that a trailer
with trailer brakes has been connected to the
Integrated Trailer Brake Module. The instru -
ment cluster display will show an “Off” message over the arcs if the ParkSense system is off, or
a “Trailer” message if the system is on, for as
long as the vehicle is in REVERSE.
The ParkSense switch LED will be on when Park-
Sense is disabled or defective. The ParkSense
switch LED will be off when the system is
enabled.
If the ParkSense switch is pushed, and the
system is disabled or requires service, the Park-
Sense switch LED will blink momentarily, and
then the LED will be on.
Service The ParkSense Rear Park Assist
System
During vehicle start up, when the Rear Park
-
Sense System has detected a faulted condition,
the instrument cluster display will show the
"Rear ParkSense Unavailable Service Required"
or the "Rear ParkSense Unavailable Wipe
Sensors" message.
When the gear selector is moved into REVERSE,
a vehicle graphic will show in the instrument
cluster display, along with the display overlay
“Rear ParkSense Unavailable Wipe Sensors.” If
the system needs service, the display overlay
will read “Rear ParkSense Unavailable Service Required” Under this condition, ParkSense will
not operate.
If "Rear ParkSense Unavailable Wipe Sensors"
appears in the instrument cluster display make
sure the outer surface and the underside of the
rear fascia/bumper is clean and clear of snow,
ice, mud, dirt or other obstruction, and then
cycle the ignition. If the message continues to
appear, see an authorized dealer.
If "Rear ParkSense Unavailable Service
Required" appears in the instrument cluster
display, see an authorized dealer.
Cleaning The ParkSense System
Clean the ParkSense sensors with water, car
wash soap and a soft cloth. Do not use rough or
hard cloths. Do not scratch or poke the sensors.
Otherwise, you could damage the sensors.
ParkSense System Usage Precautions
NOTE:
Ensure that the rear bumper is free of snow,
ice, mud, dirt and debris to keep the Park
-
Sense system operating properly.
Jackhammers, large trucks, and other vibra -
tions could affect the performance of Park -
Sense.

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STARTING AND OPERATING293
(Continued)
(Continued)
When you move the gear selector into
REVERSE with ParkSense turned off, the
instrument cluster display will show "Off" on
the vehicle graphic arcs for as long as the
vehicle is in REVERSE.
ParkSense, when on, will reduce the volume
of the radio when it is sounding a tone.
Clean the ParkSense sensors regularly,
taking care not to scratch or damage them.
The sensors must not be covered with ice,
snow, slush, mud, dirt or debris. Failure to do
so can result in the system not working prop
-
erly. The ParkSense system might not detect
an obstacle behind the fascia/bumper, or it
could provide a false indication that an
obstacle is behind the fascia/bumper.
Ensure the ParkSense system is off if objects
such as bicycle carriers, trailer hitches, etc.,
are placed within 18 inches (45 cm) of the
rear fascia/bumper while driving the vehicle.
Failure to do so can result in the system
misinterpreting a close obstacle as a sensor
problem, causing the "Rear ParkSense
Unavailable Service Required" message to
appear in the instrument cluster display.
On vehicles equipped with a tailgate, Park -
Sense should be disabled when the tailgate
is in the lowered or open position and the
vehicle is in REVERSE. A lowered tailgate
could provide a false indication that an
obstacle is behind the vehicle.
WARNING!
Drivers must be careful when backing up
even when using ParkSense. Always check
carefully behind your vehicle, look behind
you, and be sure to check for pedestrians,
animals, other vehicles, obstructions, and
blind spots before backing up. You are
responsible for safety and must continue to
pay attention to your surroundings. Failure
to do so can result in serious injury or
death.
Before using ParkSense, it is strongly
recommended that the ball mount and
hitch ball assembly is disconnected from
the vehicle when the vehicle is not used for
towing. Failure to do so can result in injury
or damage to vehicles or obstacles
because the hitch ball will be much closer
to the obstacle than the rear fascia when
the loudspeaker sounds the continuous
tone. Also, the sensors could detect the ball
mount and hitch ball assembly, depending
on its size and shape, giving a false indica -
tion that an obstacle is behind the vehicle.
CAUTION!
ParkSense is only a parking aid and it is
unable to recognize every obstacle,
including small obstacles. Parking curbs
might be temporarily detected or not
detected at all. Obstacles located above or
below the sensors will not be detected
when they are in close proximity.
WARNING! (Continued)
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294STARTING AND OPERATING
PARKSENSE FRONT AND REAR PARK ASSIST
The ParkSense Park Assist system provides
visual and audible indications of the distance
between the rear, and/or front fascia/bumper,
and a detected obstacle when backing up or
moving forward (e.g. during a parking
maneuver).
Refer to “ParkSense System Usage Precau -
tions” in this section for limitations of this
system and recommendations.
ParkSense will retain the system state (enabled
or disabled) from the previous ignition cycle
when the ignition is placed in the ON/RUN posi -
tion. ParkSense can be active only when the gear
selector is in REVERSE or DRIVE. If ParkSense is
enabled at one of these gear selector positions,
the system will remain active until the vehicle
speed is increased to approximately 7 mph
(11 km/h) or above. A warning will appear in the
instrument cluster display when the vehicle is in
REVERSE, indicating the vehicle is above Park
-
Sense operating speed. The system will become
active again if the vehicle speed is decreased to
speeds less than approximately 6 mph (9 km/h).
ParkSense Sensors
The four ParkSense sensors, located in the rear
fascia/bumper, monitor the area behind the
vehicle that is within the sensors’ field of view.
The sensors can detect obstacles from approxi -
mately 18 inches (45 cm) up to 79 inches (200 cm) from the rear fascia/bumper in the
horizontal direction, depending on the location,
type and orientation of the obstacle.
NOTE:
If equipped as a dually, the ParkSense system
has six rear sensors to assist in detection
around the dually flares.
The six ParkSense sensors, located in the front
fascia/bumper, monitor the area in front of the vehicle that is within the sensors’ field of view.
The sensors can detect obstacles from approxi
-
mately 12 inches (30 cm) up to 47 inches (120 cm) from the front fascia/bumper in the
horizontal direction, depending on the location,
type and orientation of the obstacle.
ParkSense Warning Display
The ParkSense Warning screen is located within
the instrument cluster display. It provides visual
warnings to indicate the distance between the
rear fascia/bumper and/or front fascia/bumper
and the detected obstacle. Refer to “Instrument
Cluster Display” in “Getting To Know Your
Instrument Panel” for further information.
The vehicle must be driven slowly when
using ParkSense in order to be able to stop
in time when an obstacle is detected. It is
recommended that the driver looks over
his/her shoulder when using ParkSense.
CAUTION! (Continued)

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