2021 RAM 1500 wheel

STARTING AND OPERATING171
This system uses a lifting and lowering pattern
which keeps the headlights from incorrectly
shining into oncoming traffic. When raising the
vehicle, the rear of the vehicle will move up first
and then the front. When lowering the vehicle,
the front will move down first and then the rear.
After the engine is turned off, it may be noticed
that the air suspension system operates briefly;
this is normal. The system is correcting the
position of the vehicle to ensure a proper
appearance.
To assist with changing a spare tire, the air
suspension system has a feature which allows
the automatic leveling to be disabled
Úpage 237.
NOTE:
If equipped with a touchscreen radio, all
enabling/disabling of air suspension features
must be done through the radio Ú page 237.AIR SUSPENSION MODES
The Air Suspension system has multiple modes
to protect the system in unique situations:
AERO Mode
To improve aerodynamics, the air suspension
system has a feature which will put the vehicle
into AERO height automatically Úpage 114.
Tire Jack Mode
To assist with changing a tire, the air
suspension system has a feature which allows
the automatic leveling to be disabled
Ú page 237.
Transport Mode
For towing your vehicle with four wheels off the
road, the air suspension system has a feature
which will put the vehicle into Entry/Exit height
and disable the automatic load leveling system
Ú page 237.
Wheel Alignment Mode
Before performing a wheel alignment, this
mode must be enabled Ú page 237.Protection Strategy
In order to “protect” the air suspension system,
the vehicle will disable load leveling as required
(suspension overloaded, battery charge low,
etc.). Load leveling will automatically resume as
soon as system operation requirements are
met. See an authorized dealer if system does
not resume.
NOTE:
For towing with air suspension Ú
page 214.
INSTRUMENT CLUSTER DISPLAY
M
ESSAGES
When the appropriate conditions exist, a
message will appear in the instrument cluster
display Ú page 114.
An audible chime will be heard whenever a
system error has been detected.
See an authorized dealer for system service if
normal operation does not resume.
WARNING!
The air suspension system uses a high
pressure volume of air to operate the system.
To avoid personal injury or damage to the
system, see an authorized dealer for service.
4

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172STARTING AND OPERATING
OPERATION

Air Suspension Switch

The indicator lamps 1 through 4 will illuminate
to show the current position of the vehicle.
Flashing indicator lamps will show a position
which the system is working to achieve. When
raising or lowering, the flashing indicator lamp
is the position the system is working to achieve.
Pushing the height selector switch up once will
move the suspension one position higher from
the current position, assuming all conditions
are met (i.e. key in ON/RUN position, engine
running, speed below threshold, etc). The
height selector switch can be pushed up
multiple times, each push will raise the
requested level by one position up to a maximum position of OR or the highest position
allowed based on current conditions (i.e.
vehicle speed, etc).
Pushing the height selector switch down once
will move the suspension one position lower
from the current level, assuming all conditions
are met (i.e. key in ON/RUN position, engine
running, doors closed, speed below threshold,
etc). The height selector switch can be pushed
down multiple times, each push will lower the
requested level by one position down to a
minimum of Entry/Exit Mode or the lowest
position allowed based on current conditions
(i.e. vehicle speed, etc.)
Automatic height changes will occur based on
vehicle speed and the current vehicle height.
The indicator lamps and instrument cluster
display messages will operate the same for
automatic changes and user requested
changes.
Off-Road 1 (OR1) – Indicator lamps 4, 3, 2,
and 1 will be illuminated when the vehicle is
in OR1.
Normal Ride Height (NRH) – Indicator lamps
4, 3, and 2 will be illuminated when the
vehicle is in this position.
Aero Mode – Indicator lamps 4 and 3 will be
illuminated when the vehicle is in this posi
-
tion.

Entry/Exit Mode – Indicator lamp 4 will be
illuminated when the vehicle is in Entry Exit
Mode. Entry/Exit mode can be requested up
to 33 mph (53 km/h). If vehicle speed is reduced to, and kept below, 15 mph
(24 km/h) indicator lamp 3 will flash and
indicator lamp 4 will remain solid until
Entry/Exit Mode is achieved at which point
indicator lamp 3 will turn off.

Transport Mode – No indicator lamps will be
illuminated. Transport Mode is disabled by
driving the vehicle.
Tire/Jack Mode – Indicator lamps 4 and 1 will
be illuminated. Tire/Jack Mode is disabled by
driving the vehicle.
Wheel Alignment Mode – Indicator lamps 2,
3, and 4 will be illuminated. Wheel Alignment
Mode is disabled by driving the vehicle.

21_DT_OM_EN_USC_t.book Page 172

STARTING AND OPERATING173
AXLE LOCK SYSTEM — IF EQUIPPED
This vehicle is equipped with an electronically
locking rear differential. When engaged, this
differential locks the axle shafts forcing the
wheels to spin at an equal rate. The locking of
the rear differential should only be engaged
during low-speed, extreme off-road situations
where one wheel is likely to not be in contact
with the ground. It is not recommended to drive
the vehicle with the differentials locked on
pavement due to the reduced ability to turn and
speed limitations.

Axle Lock Button
The locking rear axle is controlled by the AXLE
LOCK button.
Under normal driving conditions, the rear axle
should be unlocked.
During the command to lock the rear axle, the
indicator light will flash until the axle is locked.
After the lock command has been successfully
executed, the light will remain on solid.
Operating in 4WD LOW the locker can be
engaged up to 40 mph (64 km/h) and will
remain engaged throughout the 4WD LOW
speed range. Operating the locker in 2WD, 4WD AUTO, and
4WD LOCK/HIGH, the locker can be engaged up
to 20 mph (32 km/h). While driving with the
locker engaged, if speed exceeds 25 mph
(40 km/h), the locker will automatically
disengage, but will automatically reengage at
20 mph (32 km/h).
NOTE:
Left to right wheel speed difference may be
necessary to allow the rear axle to fully lock. If
the indicator light is flashing after selecting the
rear axle lock mode, drive the vehicle in a turn
or on loose gravel to expedite the locking action.
The axle locker could become torque locked
due to side to side loads on the rear axle.
Driving slowly while turning the steering wheel
from a left hand turn to a right hand turn or
driving in REVERSE for a short distance may be
required to release the torque lock and unlock
the axles.
To unlock the rear axle; push the AXLE LOCK
button. The AXLE LOCK indicator light will go out
when the rear axle is unlocked.
CAUTION!
Do not lock the rear axle on hard surfaced
roads. The ability to steer the vehicle is
reduced and damage to the drivetrain may
occur when the axle is locked on hard
surfaced roads.
Do not try to lock the rear axle if the vehicle
is stuck and the tires are spinning. You can
damage drivetrain components. Lock the
rear axle before attempting situations or
navigating terrain, which could possibly
cause the vehicle to become stuck.
4

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174STARTING AND OPERATING
LIMITED-SLIP DIFFERENTIAL — IF
EQUIPPED
The limited-slip differential provides additional
traction on snow, ice, mud, sand and gravel,
particularly when there is a difference between
the traction characteristics of the surface under
the right and left rear wheels. During normal
driving and cornering, the limited-slip unit
performs similarly to a conventional differential.
On slippery surfaces, however, the differential
delivers more of the driving effort to the rear
wheel having the better traction.
The limited-slip differential is especially helpful
during slippery driving conditions. With both
rear wheels on a slippery surface, a slight
application of the accelerator will supply
maximum traction. When starting with only one
rear wheel on an excessively slippery surface,
slight momentary application of the parking
brake may be necessary to gain maximum
traction. Care should be taken to avoid sudden
accelerations when both rear wheels are on a
slippery surface. This could cause both rear
wheels to spin, and allow the vehicle to slide
sideways on the crowned surface of a road or in
a turn.
POWER STEERING
ELECTRIC POWER STEERING
The electric power steering system will provide
increased vehicle response and ease of
maneuverability. The power steering system
adapts to different driving conditions.
If the steering icon is flashing, it indicates that
the vehicle needs to be taken to the dealer for
service. It is likely the vehicle has lost power
steering assistance.If the steering icon is displayed and the “POWER
STEERING SYSTEM OVER TEMP” message is
displayed on the instrument cluster screen, this
indicates an over temperature condition in the
power steering system. Once driving conditions
are safe, pull over and let the vehicle idle for a
few moments until the icon and message turn
off Ú
page 114.
If the steering icon is displayed and the
“SERVICE POWER STEERING – ASSIST OFF”
message is displayed the instrument cluster
screen, this indicates the vehicle needs to be
taken to the dealer for service Ú page 114.
NOTE:
Even if the power steering assistance is no
longer operational, it is still possible to steer
the vehicle. Under these conditions there will
be a substantial increase in steering effort,
especially at low speeds and during parking
maneuvers.
If the condition persists, see an authorized
dealer for service.
WARNING!
When servicing vehicles equipped with a
limited-slip or locking differential never run
the engine with one rear wheel off the ground
since the vehicle may drive through the rear
wheel remaining on the ground and result in
unintended movement.

21_DT_OM_EN_USC_t.book Page 174

STARTING AND OPERATING177
TO MANUALLY TURN ON THE STOP
S
TART SYSTEM
Push the Stop/Start OFF switch (located on the
switch bank). The light on the switch will turn
off.
SYSTEM MALFUNCTION
If there is a malfunction in the Stop/Start
system, the system will not shut down the
engine. A “SERVICE STOP/START SYSTEM”
message will appear in the instrument cluster
display Ú page 126.
The system will need to be checked by an
authorized dealer.
CRUISE CONTROL SYSTEMS — IF EQUIPPED
Your vehicle may be equipped with the Cruise
Control system, or the Adaptive Cruise Control
(ACC) system:
Cruise Control for cruising at a constant
preset speed.
Adaptive Cruise Control (ACC) for maintaining
a set distance between you and the vehicle
ahead using Fixed Speed Cruise Control to
automatically adjust the preset speed. NOTE:
In vehicles equipped with ACC, if an ACC
distance is not set, Fixed Speed Cruise Control
will not detect vehicles directly ahead of you.
Always be aware of the mode selected.
CRUISE CONTROL — IF EQUIPPED
When engaged, the Cruise Control takes over
accelerator operations at speeds greater than
20 mph (32 km/h).
The Cruise Control buttons are located on the
right side of the steering wheel.

Cruise Control Buttons
NOTE:
In order to ensure proper operation, the Cruise
Control system has been designed to shut down
if multiple Cruise Control functions are operated
at the same time. If this occurs, the Cruise
Control system can be reactivated by pushing
the Cruise Control on/off button and resetting
the desired vehicle set speed.
To Activate
Push the on/off button to activate the Cruise
Control. The cruise indicator light in the
instrument cluster display will illuminate. To
turn the system off, push the on/off button a 1 — CANC/Cancel
2 — SET (+)/Accel
3 — On/Off
4 — RES/Resume
5 — SET (-)/Decel
WARNING!
Cruise Control can be dangerous where the
system cannot maintain a constant speed.
Your vehicle could go too fast for the
conditions, and you could lose control and
have an accident. Do not use Cruise Control
in heavy traffic or on roads that are winding,
icy, snow-covered or slippery.
4

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180STARTING AND OPERATING
(Continued)
Adaptive Cruise Control (ACC) Operation
The buttons on the right side of the steering
wheel operate the Adaptive Cruise Control
system.
Adaptive Cruise Control Buttons

Adaptive Cruise Control (ACC) Menu
The instrument cluster display will show the
current ACC system settings. The information it
displays depends on ACC system status.
Push the Adaptive Cruise Control (ACC) on/off
button 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.”
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 your vehicle to a complete
stop while following a vehicle ahead
and hold your vehicle for approximately
three minutes in the stop position. If the
vehicle ahead does not start moving
within three minutes the parking brake
will be activated, and the ACC system
will be cancelled.
WARNING!
(Continued)
You should switch off the ACC system:
When driving in fog, heavy rain, heavy
snow, sleet, heavy traffic, and complex
driving situations (i.e., in highway construc -
tion zones).
When entering a turn lane or highway off
ramp; when driving on roads that are
winding, icy, snow-covered, slippery, or
have steep uphill or downhill slopes.
When towing a trailer up or down steep
slopes.
When circumstances do not allow safe
driving at a constant speed.
WARNING! (Continued)
1 — Distance Setting Increase
2 — Adaptive Cruise Control (ACC) On/Off
3 — Distance Setting Decrease

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STARTING AND OPERATING195
PARKSENSE ACTIVE PARK ASSIST SYSTEM
— IF EQUIPPED
The ParkSense Active Park Assist system is
intended to assist the driver during parallel and
perpendicular parking maneuvers by identifying
a proper parking space, providing audible/
visual instructions, and controlling the steering
wheel. The ParkSense Active Park Assist system
is defined as “semi-automatic” since the driver
maintains control of the accelerator, gear
selector and brakes. Depending on the driver's parking maneuver selection, the ParkSense
Active Park Assist system is capable of
maneuvering a vehicle into a parallel or a
perpendicular parking space on either side (i.e.,
driver side or passenger side).
NOTE:
The driver is always responsible for
controlling the vehicle, responsible for any
surrounding objects, and must intervene as
required.
The system is provided to assist the driver
and not to substitute the driver.
During a semi-automatic maneuver, if the
driver touches the steering wheel after being
instructed to remove their hands from the
steering wheel, the system will cancel, and
the driver will be required to manually
complete the parking maneuver.
The system may not work in all conditions
(e.g. environmental conditions such as heavy
rain, snow, etc., or if searching for a parking
space that has surfaces that will absorb the
ultrasonic sensor waves).
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, and give a false indi
-
cation that an obstacle is behind the
vehicle, and could cause false braking.
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.
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.4

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196STARTING AND OPERATING
New vehicles from the dealership must have
at least 30 miles (48 km) accumulated
before the ParkSense Active Park Assist
system is fully calibrated and performs accu -
rately. This is due to the system’s dynamic
vehicle calibration to improve the perfor -
mance of the feature.
The driver must control the vehicle’s brakes.
The automatic emergency braking feature is
NOT intended to substitute for the driver
during REVERSE maneuvers.
ENABLING AND DISABLING THE
P
ARKSENSE ACTIVE PARK ASSIST
S
YSTEM
The ParkSense Active Park Assist
system can be enabled and disabled
with the ParkSense Active Park Assist
switch, located on the switch panel
below the Uconnect display.
NOTE:
If your vehicle is equipped with a 12-inch
Uconnect display, the ParkSense Active Park
Assist switch is located above the display. To enable or disable the ParkSense Active Park
Assist system, push the ParkSense Active Park
Assist switch once (LED turns on). Pushing the
switch a second time will disable the system
(LED turns off).
The ParkSense Active Park Assist system will
turn off automatically for any of the following
conditions:
Parking maneuver is completed.
Vehicle speed is greater than 18 mph
(30 km/h) when searching for a parking
space.
Vehicle speed is greater than 5 mph (7 km/h)
during active steering guidance into the
parking space.
Steering wheel is touched during active
steering guidance into the parking space.
ParkSense Front/Rear Park Assist switch is
pushed.
Driver's door is opened.
Tailgate is opened.
Electronic Stability Control/Anti-Lock Braking
System intervention.NOTE:
The ParkSense Active Park Assist system will
allow a maximum of eight shifts between DRIVE
and REVERSE. If the maneuver cannot be
completed within eight shifts, the system will
cancel and the instrument cluster display will
instruct the driver to complete the maneuver
manually.
The ParkSense Active Park Assist system will
only operate and search for a parking space
when the following conditions are present:
Gear selector is in DRIVE.
The ignition is in the ON/RUN position.
The ParkSense Active Park Assist switch is
activated.
Driver's door is closed.
Tailgate is closed.
Vehicle speed is less than 15 mph (25 km/h).
The outer surface and the underside of the
front and rear fascias/bumpers are clean
and clear of snow, ice, mud, dirt or other
obstruction.

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