2019 Ram 4500 Chassis Cab sensor

SAFETY 205
(Continued)
Driver And Passenger Front Air Bag Features
The Advanced Front Air Bag system has multistage driver
and front passenger air bags. This system provides output
appropriate to the severity and type of collision as deter-
mined by the Occupant Restraint Controller (ORC), which
may receive information from the front impact sensors (if
equipped) or other system components.
The first stage inflator is triggered immediately during an
impact that requires air bag deployment. A low energy
output is used in less severe collisions. A higher energy
output is used for more severe collisions.
This vehicle may be equipped with a driver and/or front
passenger seat belt buckle switch that detects whether the
driver or front passenger seat belt is buckled. The seat belt
buckle switch may adjust the inflation rate of the Advanced
Front Air Bags. Front Air Bag Operation
Front Air Bags are designed to provide additional protection
by supplementing the seat belts. Front air bags are not
expected to reduce the risk of injury in rear, side, or rollover
collisions. The front air bags will not deploy in all frontal
collisions, including some that may produce substantial
vehicle damage — for example, some pole collisions, truck
underrides, and angle offset collisions.
WARNING!
• No objects should be placed over or near the air bag on the instrument panel or steering wheel because any
such objects could cause harm if the vehicle is in a colli -
sion severe enough to cause the air bag to inflate.
• Do not put anything on or around the air bag covers or attempt to open them manually. You may damage the
air bags and you could be injured because the air bags
may no longer be functional. The protective covers for
the air bag cushions are designed to open only when
the air bags are inflating.
• Relying on the air bags alone could lead to more severe injuries in a collision. The air bags work with your seat
belt to restrain you properly. In some collisions, air
bags won’t deploy at all. Always wear your seat belts
even though you have air bags.
WARNING! (Continued)
4

206 SAFETY
On the other hand, depending on the type and location of
impact, front air bags may deploy in crashes with little
vehicle front-end damage but that produce a severe initial
deceleration.
Because air bag sensors measure vehicle deceleration over
time, vehicle speed and damage by themselves are not good
indicators of whether or not an air bag should have
deployed.
Seat belts are necessary for your protection in all collisions,
and also are needed to help keep you in position, away from
an inflating air bag.
When the ORC detects a collision requiring the front air bags,
it signals the inflator units. A large quantity of non-toxic gas
is generated to inflate the front air bags.
The steering wheel hub trim cover and the upper passenger
side of the instrument panel separate and fold out of the way
as the air bags inflate to their full size. The front air bags fully
inflate in less time than it takes to blink your eyes. The front
air bags then quickly deflate while helping to restrain the
driver and front passenger.Knee Impact Bolsters
The Knee Impact Bolsters help protect the knees of the driver
and front passenger, and position the front occupants for
improved interaction with the front air bags.
Supplemental Side Air Bags
Supplemental Seat-Mounted Side Air Bags (SABs) — If
Equipped
Your vehicle may be equipped with Supplemental
Seat-Mounted Side Air Bags (SABs). If your vehicle is
equipped with Supplemental Seat-Mounted Side Air Bags
(SABs), please refer to the information below.
WARNING!
• Do not drill, cut, or tamper with the knee impact bolsters in any way.
• Do not mount any accessories to the knee impact bolsters such as alarm lights, stereos, citizen band
radios, etc.

SAFETY 209
(Continued)
Side Impacts
The Side Air Bags are designed to activate in certain side
impacts. The Occupant Restraint Controller (ORC) deter-
mines whether the deployment of the Side Air Bags in a
particular impact event is appropriate, based on the severity
and type of collision. The side impact sensors aid the ORC in
determining the appropriate response to impact events. The
system is calibrated to deploy the Side Air Bags on the
impact side of the vehicle during impacts that require Side
Air Bag occupant protection. In side impacts, the Side Air
Bags deploy independently; a left side impact deploys the
left Side Air Bags only and a right-side impact deploys the
right Side Air Bags only. Vehicle damage by itself is not a
good indicator of whether or not Side Air Bags should have
deployed.
The Side Air Bags will not deploy in all side collisions,
including some collisions at certain angles, or some side
collisions that do not impact the area of the passenger
compartment. The Side Air Bags may deploy during angled
or offset frontal collisions where the front air bags deploy.
Side Air Bags are a supplement to the seat belt restraint
system. Side Air Bags deploy in less time than it takes to
blink your eyes.WARNING!
• Occupants, including children, who are up against or very close to Side Air Bags can be seriously injured or
killed. Occupants, including children, should never
lean on or sleep against the door, side windows, or area
where the side air bags inflate, even if they are in an
infant or child restraint.
• Seat belts (and child restraints where appropriate) are necessary for your protection in all collisions. They also
help keep you in position, away from an inflating Side
Air Bag. To get the best protection from the Side Air
Bags, occupants must wear their seat belts properly and
sit upright with their backs against the seats. Children
must be properly restrained in a child restraint or
booster seat that is appropriate for the size of the child.
WARNING!
• Side Air Bags need room to inflate. Do not lean against the door or window. Sit upright in the center of the seat.
• Being too close to the Side Air Bags during deployment could cause you to be severely injured or killed.
4

210 SAFETY
NOTE:
Air bag covers may not be obvious in the interior trim, but
they will open during air bag deployment.
Rollover Events (If Equipped With Rollover Sensing)

Side Air Bags are designed to activate in certain rollover events
(if equipped with rollover sensing). The Occupant Restraint
Controller (ORC) determines whether the deployment of the
Side Air Bags in a particular rollover event is appropriate,
based on the severity and type of collision. Vehicle damage by
itself is not a good indicator of whether or not Side Air Bags
should have deployed.

The Side Air Bags will not deploy in all rollover events. The
rollover sensing system determines if a rollover event may
be in progress and whether deployment is appropriate. In
the event the vehicle experiences a rollover or near rollover
event, and deployment of the Side Air Bags is appropriate,
the rollover sensing system will also deploy the seat beltpretensioners (if equipped with pretensioners) on both sides
of the vehicle.
The SABICs may help reduce the risk of partial or complete
ejection of vehicle occupants through side windows in
certain rollover or side impact events.
Air Bag System Components
NOTE:
The Occupant Restraint Controller (ORC) monitors the
internal circuits and interconnecting wiring associated with
electrical Air Bag System Components listed below:
• Occupant Restraint Controller (ORC)
• Air Bag Warning Light
• Steering Wheel and Column
• Instrument Panel
• Knee Impact Bolsters
• Driver and Front Passenger Air Bags
• Seat Belt Buckle Switch
• Supplemental Side Air Bags — If Equipped
• Front and Side Impact Sensors — If Equipped
• Seat Belt Pretensioners — If Equipped

• Relying on the Side Air Bags alone could lead to more
severe injuries in a collision. The Side Air Bags work
with your seat belt to restrain you properly. In some colli-
sions, Side Air Bags won’t deploy at all. Always wear
your seat belt even though you have Side Air Bags.

WARNING! (Continued)

288 STARTING AND OPERATING
To Resume Speed
To resume a previously set speed, push the RES (+) button
and release. Resume can be used at any speed above 20 mph
(32 km/h).
To Deactivate
A soft tap on the brake pedal, pushing the CANCEL button,
or normal brake pressure while slowing the vehicle will
deactivate the Speed Control without erasing the set speed
from memory.
Pushing the On/Off button, or returning the ignition to OFF,
erases the set speed from memory.
ADAPTIVE CRUISE CONTROL (ACC) — IF EQUIPPED
Adaptive Cruise Control (ACC) increases the driving conve-
nience provided by cruise control while traveling on high -
ways and major roadways. However, it is not a safety system
and not designed to prevent collisions. Speed Control func-
tion performs differently. Please refer to the proper section
within this chapter.
ACC will allow you to keep cruise control engaged in light
to moderate traffic conditions without the constant need to
reset your cruise control. ACC utilizes a radar sensor and a forward facing camera designed to detect a vehicle directly
ahead of you.
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) automatically 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 maintaining an appro -
priate 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 function differently. Always
confirm which mode is selected.

STARTING AND OPERATING 297
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 instrument cluster displays the “Sensed Vehicle
Indicator” icon, and the system adjusts vehicle speed auto -
matically 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 the information on ACC Activation).
The maximum braking applied by ACC is limited; however,
the driver can always apply the brakes manually, if neces -
sary.
NOTE:
The brake lights will illuminate whenever the ACC system
applies the brakes.
A Proximity Warning will alert the driver if ACC predicts
that its maximum braking level is not sufficient to maintain
the set distance. If this occurs, a visual alert “BRAKE” will
flash in the instrument cluster display and a chime will
sound while ACC continues to apply its maximum braking
capacity.5

300 STARTING AND OPERATING
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 WarningThe 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 rearview
mirror.

STARTING AND OPERATING 301
To keep the ACC System operating properly, it is important
to note the following maintenance items:
• Always keep the sensor clean. Carefully clear the wind-
shield.
• Do not remove any screws from the sensor. Doing so could cause an ACC system 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 reac -
tivating 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 after -
market 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 Wind
-
shield” 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 and fog. The ACC system may also become
temporarily blinded due to obstructions, such as mud, dirt,
or ice on windshield, driving directly into the sun and fog on
the inside of glass. In these cases, the instrument cluster
display will show “ACC/FCW Limited Functionality Clean
Front Windshield” and the system will have degraded
performance.
The “ACC/FCW Limited Functionality Clean Front Wind -
shield” 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 rear view mirror. They may require
cleaning or removal of an obstruction.
5