2021 RAM CHASSIS CAB ECU

22GETTING TO KNOW YOUR VEHICLE
Automatic Temperature Control (ATC) — If
Equipped
The climate controls automatically adjust to an
optimal temperature and mode, dependent on
the outside ambient temperature. When the
ignition is placed in the ON/RUN position, the
climate controls will resume their previous
settings.
Manual Temperature Control (MTC) — If
Equipped
In ambient temperatures of 40°F (4.5°C) or
below, the climate settings will default to
maximum heat, with fresh air entering the
cabin. If the front defrost timer expires, the
vehicle will enter Mix Mode.
In ambient temperatures from 40°F (4.5°C)
to 78°F (26°C), the climate settings will be
based on the last settings selected by the
driver.

In ambient temperatures of 78°F (26°C) or
above, the climate settings will default to MAX
A/C, Bi-Level mode, with Recirculation on.

For more information on ATC, MTC, and climate
control settings, see Ú page 58. NOTE:
These features will stay on through the duration
of remote start, or until the ignition is placed in
the ON/RUN position. The climate control
settings will change, and exit the automatic
defaults, if manually adjusted by the driver
while the vehicle is in remote start mode.
This includes turning the climate controls off
using the OFF button.
REMOTE START ABORT MESSAGE
The following messages will display in the
instrument cluster display if the vehicle fails to
remote start or exits remote start prematurely:
Remote Start Cancelled — Door Open
Remote Start Cancelled — Hood Open
Remote Start Cancelled — Fuel Low
Remote Start Cancelled — System Fault

Remote Start Disabled — Start Vehicle to Reset

The instrument cluster display message stays
active until the ignition is placed in the ON/RUN
position.
REMOTE START — IF EQUIPPED (DIESEL)
This system uses the key fob to start
the engine conveniently from outside
the vehicle while still maintaining
security. The system has a range of
approximately 300 ft (91 m).
Remote start is used to defrost windows in cold
weather, and to reach a comfortable climate in
all ambient conditions before the driver enters
the vehicle.
NOTE:
Obstructions between the vehicle and the
key fob may reduce this range.
The Remote Start system will wait for the
Wait To Start Light Úpage 114 to extinguish
before cranking the engine. This allows time
for the intake heater to preheat the incoming
air, and is normal operation in cold weather.

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GETTING TO KNOW YOUR VEHICLE23
HOW TO USE REMOTE START

Push and release the Remote Start button on the
key fob twice within five seconds. The vehicle
doors will lock, the parking lights will flash, and
the horn will chirp twice (if programmed). Then,
the engine will start, and the vehicle will remain
in the Remote Start mode for a 15 minute cycle.

Pushing the remote start button a third time
shuts the engine off.
To drive the vehicle, push the unlock button,
insert the key into the ignition, and turn to the
ON/RUN position.
All of the following conditions must be met
before the engine will remote start:
Gear selector in PARK
Doors closed
Hood closed
Hazard switch off
Brake switch inactive (brake pedal not
pressed)
Battery at an acceptable charge level
PANIC button not pushed
Fuel meets minimum requirement

Water In Fuel Indicator Light is not illuminated

Wait To Start Light is not illuminated
Malfunction Indicator Light (MIL) is not illumi -
nated
For additional functions of the Remote Start
system, see Ú page 21
VEHICLE SECURITY SYSTEM — IF EQUIPPED
The Vehicle Security system monitors the
vehicle doors and ignition for unauthorized
operation. When the Vehicle Security system is
activated, interior switches for door locks are
disabled. If something triggers the alarm, the
Vehicle Security system will provide the
following audible and visible signals:
The horn will pulse
The turn signals will flash
The vehicle security light in the instrument
cluster will flash
TO ARM THE SYSTEM
Follow these steps to arm the Vehicle Security
system:

1. Make sure the vehicle’s ignition is placed
in the OFF position.

For vehicles equipped with Keyless Entry,
make sure the vehicle’s keyless ignition
system is OFF.
WARNING!
Do not start or run an engine in a closed
garage or confined area. Exhaust gas
contains Carbon Monoxide (CO) which is
odorless and colorless. Carbon Monoxide is
poisonous and can cause serious injury or
death when inhaled.
Keep key fobs away from children. Opera -
tion of the Remote Start System, windows,
door locks or other controls could cause
serious injury or death.
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24GETTING TO KNOW YOUR VEHICLE
2. Perform one of the following methods to
lock the vehicle:
Push the lock button on the interior
power door lock switch with the driver
and/or passenger door open.
Push the lock button on the exterior
Passive Entry Door Handle with a valid
key fob available in the same exterior
zone Ú page 26.
Push the lock button on the key fob.
3. If any doors are open, close them.
The Vehicle Security system will set when you
use the power door locks, or use the key fob to
lock the doors. After all the doors are locked
and closed, the vehicle security light, in the
instrument panel cluster, will flash rapidly for
about 16 seconds to indicate that the alarm is
being set. After the alarm is set, the vehicle
security light will flash at a slower rate to
indicate that the system is armed.
TO DISARM THE SYSTEM
The Vehicle Security system can be disarmed
using any of the following methods:

1. Push the unlock button on the key fob.

2. Grab the Passive Entry Door Handle with a valid key fob within 5 ft (1.5 m) of the
Passive Entry door handle (if equipped)
Úpage 26.
3. Cycle the ignition out of the OFF position.
The Vehicle Security system is designed to
protect your vehicle. However, you can create
conditions where the system will give you a false
alarm. If one of the previously described arming
sequences has occurred, the Vehicle Security
system will arm regardless of whether you are in
the vehicle or not. If you remain in the vehicle
and open a door, the alarm will sound. If this
occurs, disarm the Vehicle Security system.
If the Vehicle Security system is armed and the
battery becomes disconnected, the Vehicle
Security system will remain armed when the
battery is reconnected; the exterior lights will
flash, and the horn will sound. If this occurs,
disarm the Vehicle Security system.
REARMING OF THE SYSTEM

If something triggers the alarm, and no action is
taken to disarm it, the Vehicle Security system
will turn the horn off after 29 seconds,
five seconds between cycles, and up to eight
cycles if the trigger remains active. The Vehicle
Security system will then rearm itself.

SECURITY SYSTEM MANUAL OVERRIDE
The Vehicle Security system will not arm if you
lock the doors using the manual door lock.
DOORS
MANUAL DOOR LOCKS
The power door locks can be manually locked
from inside the vehicle by using the door lock
knob. To lock each door, push the door lock
knob on each door trim panel downward.
To unlock the front doors, pull the inside door
handle to the first detent. To unlock the rear
doors, pull the door lock knob on the door trim
panel upward. If the lock knob is down when the
door is closed, the door will lock. Therefore,
make sure the key fob is not inside the vehicle
before closing the door.

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GETTING TO KNOW YOUR VEHICLE25
(Continued)

Door Lock Knob

POWER DOOR LOCKS — IF EQUIPPED
The power door lock switches are located on
each front door panel. Push the switch to lock or
unlock the doors.
Power Door Lock Switches

The driver’s door will unlock automatically if the
keys are found inside the vehicle when the door
lock button on the front door panel is used to
lock the door. This will occur for two attempts.
Upon the third attempt, the doors will lock even
if the key is inside.
WARNING!
Do not leave children or animals inside
parked vehicles in hot weather. Interior
heat build-up may cause serious injury or
death.
For personal security and safety in the
event of an collision, lock the vehicle doors
as you drive as well as when you park and
leave the vehicle.
Before exiting a vehicle, always shift the
automatic transmission into PARK, apply
the parking brake, turn the vehicle OFF,
remove the key fobs from vehicle, and lock
all doors. and lock your vehicle.

Never leave children alone in a vehicle,
or with access to an unlocked vehicle.
Leaving children in a vehicle unattended is
dangerous for a number of reasons. A child
or others could be seriously or fatally injured.
Children should be warned not to touch the
parking brake, brake pedal or the gear
selector.

Allowing children to be in a vehicle unat -
tended is dangerous for a number of
reasons. A child or others could be seriously
or fatally injured. Children should be
warned not to touch the parking brake,
brake pedal or the gear selector.
Do not leave the key fob in or near the
vehicle, or in a location accessible to chil-
dren, and do not leave the ignition of a
vehicle equipped with Keyless Enter-N-Go
in the ACC or ON/RUN mode. A child could
operate power windows, other controls, or
move the vehicle.
WARNING! (Continued)
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26GETTING TO KNOW YOUR VEHICLE
NOTE:
If the key fob is located next to a mobile phone,
laptop, or other electronic device, the wireless
signal may get blocked, and the driver’s door
may not unlock automatically.
If the door lock switch is pushed while the
ignition is in ACC or ON/RUN and the driver's
door is open, the doors will not lock.
KEYLESS ENTER-N-GO — PASSIVE
E
NTRY (IF EQUIPPED)

The Passive Entry system is an enhancement to
the vehicle’s Remote Keyless Entry system and a
feature of Keyless Enter-N-Go. This feature allows
you to lock and unlock the vehicle’s door(s)
without having to push the key fob lock or unlock
buttons.

NOTE:
Passive Entry may be programmed on/off
within Uconnect Settings Ú page 228.
If wearing gloves or if it has been raining/
snowing on the Passive Entry door handle,
the unlock sensitivity can be affected,
resulting in a slower response time.
If the vehicle is unlocked by Passive Entry
and no door is opened within 60 seconds, the
vehicle will re-lock and if equipped will arm
the security alarm.
The Vehicle Security system can be armed/
disarmed by pushing the Passive Entry key
fob lock/unlock buttons (if equipped).

The key fob may not be able to be detected by
the vehicle Passive Entry system if it is located
next to a mobile phone, laptop or other elec -
tronic device; these devices may block the key
fob's wireless signal and prevent the Passive
Entry door handle from locking/unlocking the
vehicle.

To Unlock From The Driver or Passenger Side:
With a valid Passive Entry key fob within 5 ft
(1.5 m) of the door handle, grab the handle to
unlock the vehicle. Grabbing the driver’s door
handle will unlock the driver door automatically.
Grabbing the passenger door handle will unlock
all doors automatically. The interior door panel
lock knob will raise when the door is unlocked.
Grab The Door Handle To Unlock

NOTE:
If “Unlock All Doors 1st Press” is
programmed all doors will unlock when you
grab hold of the front driver’s door handle.
You can select between “Unlock Driver Door
1st Press” and “Unlock All Doors 1st Press”
within Uconnect Settings Ú page 228.
All doors will unlock when the front
passenger door handle is grabbed regardless
of the driver’s door unlock preference
setting.

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GETTING TO KNOW YOUR VEHICLE39
NOTE:
Four-way head restraints have seven tilt/
locking positions. When pulling fully forward,
the head restraint will spring back to the
untilted, rearward most position when released.
Two-Way Head Restraints — If Equipped
Your vehicle may be equipped with front
two-way driver and passenger head restraints.
To raise the head restraint, pull upward on the
head restraint. To lower the head restraint,
push the adjustment button, located at the
base of head restraint, and push downward
on the head restraint.

Head Restraint Adjustment Button Location
NOTE:
If your vehicle is equipped with a front bench
seat, the center head restraint is not adjustable
or removable.
Front Head Restraint Removal
To remove the head restraint, push the
adjustment button and the release button
while pulling upward on the whole assembly.
To reinstall the head restraint, put the head
restraint posts into the holes and adjust it to the
appropriate height.
Rear Head Restraint Adjustment
The rear seats are equipped with adjustable
and removable head restraints. To raise the
head restraint, pull upward on the head
restraint. To lower the head restraint, push the
adjustment button located on the base of the
head restraint and push downward on the head
restraint.
WARNING!

All occupants, including the driver, should
not operate a vehicle or sit in a vehicle’s seat
until the head restraints are placed in their
proper positions in order to minimize the risk
of neck injury in the event of a crash.

Head restraints should never be adjusted
while the vehicle is in motion. Driving a
vehicle with the head restraints improperly
adjusted or removed could cause serious
injury or death in the event of a collision.
WARNING!
A loose head restraint thrown forward in a
collision or hard stop could cause serious
injury or death to occupants of the vehicle.
Always securely stow removed head
restraints in a location outside the occu
-
pant compartment.
ALL the head restraints MUST be rein -
stalled in the vehicle to properly protect
the occupants. Follow the re-installation
instructions above prior to operating the
vehicle or occupying a seat.
2

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40GETTING TO KNOW YOUR VEHICLE

Release/Adjustment Buttons

NOTE:
The rear center head restraint (Crew Cab)
has only one adjustment position that is used
to aid in the routing of a tether Ú page 292.
Do not reposition the head restraint
180 degrees to the incorrect position in an
attempt to gain additional clearance to the
back of the head.
Rear Head Restraint Removal

To remove the head restraint, push the
adjustment button and the release button
while pulling upward on the whole assembly.
To reinstall the head restraint, put the head
restraint posts into the holes and adjust it to
the appropriate height.

NOTE:
To remove outboard restraints, the rear seat
bottom must be folded up.
DRIVER ADJUSTABLE PEDALS — IF
EQUIPPED

The adjustable pedals system is designed to
allow a greater range of driver comfort for
steering wheel tilt and seat position. This feature
allows the brake and accelerator pedals to move
toward or away from the driver to provide
improved position with the steering wheel.

The adjustable pedal switch is located to the left
side of the steering column.

Adjustable Pedals Switch

The pedals can be adjusted with the ignition in
the OFF position.
1 — Release Button
2 — Adjustment Button
WARNING!
A loose head restraint thrown forward in a
collision or hard stop could cause serious
injury or death to occupants of the vehicle.
Always securely stow removed head
restraints in a location outside the occu -
pant compartment.
ALL the head restraints MUST be rein -
stalled in the vehicle to properly protect
the occupants. Follow the re-installation
instructions above prior to operating the
vehicle or occupying a seat.

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GETTING TO KNOW YOUR VEHICLE47
UNIVERSAL GARAGE DOOR OPENER
(HOMELINK®) — IF EQUIPPED

HomeLink® Buttons

HomeLink® replaces up to three hand-held
transmitters that operate devices such as
garage door openers, motorized gates,
lighting, or home security systems.
The HomeLink® unit is powered by
your vehicles 12 Volt battery.
The HomeLink® buttons that are located in
the overhead console or sunvisor designate
the three different HomeLink® channels.
To operate HomeLink®, push and release
any of the programmed HomeLink® buttons.
These buttons will activate the devices they
are programmed to with each press of the
corresponding HomeLink® button.
The HomeLink® indicator light is located
above the center button.
BEFORE YOU BEGIN PROGRAMMING
H
OMELINK®
For efficient programming and accurate
transmission of the radio frequency signal, it is
recommended that a new battery be placed in
the hand-held transmitter of the device that is
being programmed to the HomeLink® system.
Make sure your hand-held transmitter is
programmed to activate the device you are
trying to program your HomeLink® button to.
Ensure that your vehicle is parked outside of the
garage before you begin programming.
It is recommended that you erase all the
channels of your HomeLink® before you use it
for the first time.
ERASING ALL THE HOMELINK®
C
HANNELS
To erase the channels, follow this procedure:

1. Place the ignition switch into the ON/RUN
position.

2. Push and hold the two outside HomeLink® buttons (I and III) for up to 20 seconds, or
until the HomeLink® indicator light flashes.
NOTE:
Erasing all channels should only be performed
when programming HomeLink® for the first
time. Do not erase channels when programming
additional buttons.
IDENTIFYING WHETHER YOU HAVE A
R
OLLING CODE OR NON-ROLLING CODE
D
EVICE
Before programming a device to one of your
HomeLink® buttons, you must determine
whether the device has a rolling code or
non-rolling code.
CAUTION!
It is recommended to fold the mirrors into the
full rearward position to resist damage when
entering a car wash or a narrow location.
2

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