Diono Radian 3 RX User manual

READ INSTRUCTION MANUAL
before using this child restraint
radian®3 RX
car seat
Instruction Manual
from birth up to 120 lbs
All-in-one convertible

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WELCOME TO THE DIONO FAMILY!
BEFORE YOU BEGIN
Register this car seat
Certification
Safe Use Guide
Safe Use Checklist
Warnings & Safe Practices
Parts Listing
Vehicle Seating Locations
Top Tether
First Setup
REAR-FACING INSTALLATION
Rear-Facing Checklist
LATCH installation
Lap-Shoulder Belt installation
Lap Belt Installation
FORWARD-FACING INSTALLATION
Forward-Facing Checklist
LATCH installation
Lap-Shoulder Belt installation
Lap Belt Installation
BOOSTER MODE INSTALLATION
Securing Your Child, Changing Harness Position
Care and Maintenance
Belt Locking Clip, Safe Stop and Lap Belt Cushion
Harness Removal & Replacement
Aircraft Installation
Infant Support, Expandable Side Wings, and Cupholder Use
WARRANTY
CONTENTS BEFORE YOU BEGIN
3
4
6
7-8
9-10
11-15
16-17
18-23
24-25
26-28
29-39
30-31
32-35
36-37
38-39
40-55
41-42
43-47
48-51
52-55
56-57
58-61
62-63
64-66
68-69
70
71-72
73-75

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REGISTER THIS CAR SEAT HELLO!
Please take a moment to fill out the prepaid registration card
attached to the harness of the seat and mail it in today or register
online at: us.diono.com/register
Child restraints could be recalled for safety reasons. You must register
this restraint to be reached in a recall. Send your name, address,
e-mail address if available, and the restraint’s model number and
manufacturing date to:
Diono
PO Box 77129
Seattle, WA 98177
or call 1-855-463-4666 or register online at: us.diono.com/register
For recall information, call the U.S. Government’s Vehicle Safety
Hotline at 1-888-327-4236 (TTY: 1-800-424-9153), or go to
http://www.NHTSA.gov.
For future reference, in the case of a change of address. Please take a
moment to fill out the following information:
This information can be found either on the registration card or on
the manufacturing label located on the seat.
Model Number :
Serial Number :
Manufactured in (date) :
Purchase date:
Our Story
Time. It goes so fast...
Who would have thought that nearly two decades have passed since we first
stepped out into the world and started a business dedicated to family travel.
Well the world has changed a lot, but we’re proud to say that we haven’t,
(sure we’ve grown up), but we’re still as passionate about what we do today as
we were back then.
Our story is ‘Made of Seattle’, a city like no other. This is a place where creative
minds and innovators rub shoulders within a landscape of adventure; a place,
With a love for design and an understanding of modern parenting, we strive to
create amazing products, so that you and your little ones can celebrate the joy
in every journey.
People who own Diono products can be found in all four corners of the big
blue green ball, we all call home. Some are fans and followers, some are
supporters, tweeters, social media magicians, miracle moms and devoted dads.
“lol”, we love you all.
Without your passion, pictures, words and stories, we would never hear your
voice. So tell us about your patch of grass, and join in the hustle
and bustle at www.diono.com
share your journey @diono
social or find the latest news.
Our Story
Time. It goes so fast...
Who would have thought that nearly two decades have passed since we first
stepped out into the world and started a business dedicated to family travel.
Well the world has changed a lot, but we’re proud to say that we haven’t,
(sure we’ve grown up), but we’re still as passionate about what we do today as
we were back then.
Our story is ‘Made of Seattle’, a city like no other. This is a place where creative
minds and innovators rub shoulders within a landscape of adventure; a place,
where being ‘a little dierent’, is the everyday norm.
With a love for design and an understanding of modern parenting, we strive to
create amazing products, so that you and your little ones can celebrate the joy
in every journey.
People who own Diono products can be found in all four corners of the big
blue green ball, we all call home. Some are fans and followers, some are sup-
porters, tweeters, social media magicians, miracle moms and devoted dads.
“lol”, we love you all.
Without your passion, pictures, words and stories, we would never hear your
voice. So tell us about your patch of grass, and join in the hustle and bustle at
www.diono.com.

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SAFE USE GUIDE
This child restraint system conforms to all
applicable Federal Motor Vehicle Safety
Standards (FMVSS 213).
CERTIFICATION
This child restraint is certified for use in aircraft
only when in harness mode.
This child restraint is not certified for use in aircraft
when used in booster mode. Aircraft seats do
not have shoulder belts which are required for
use with this booster.
Diono and the Federal Aviation Administration (FAA)
strongly urge you to secure your child in a child
restraint system (CRS) or device for the duration of
your flight. Please contact the airline for their specific
policies.
YOUR CHILD’S SAFETY DEPENDS ON YOU.
DEATH OR SERIOUS INJURY CAN OCCUR.
No car seat can guarantee protection from
injury in every situation, but proper use helps
to reduce the risk of serious injury or death.
Carefully read and understand all instructions
and warnings in this manual. Your child’s
safety depends on you knowing how to setup,
install and use this Child Restraint properly.
Choose the correct mode of use for your
child, depending on their weight.
This Child Restraint is designed for use only
with children who weigh between 5 and
120 lbs (2.3 and 54 kg) and whose height is
57 inches (144 cm) or less in the following
modes.
WARNING – FAILURE TO FOLLOW THESE
INSTRUCTIONS AND THE PRODUCT
LABELS CAN RESULT IN SERIOUS INJURY
OR DEATH TO YOUR CHILD.

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SAFE USE GUIDE
DO NOT place this child restraint rear-facing in
a vehicle seating location with an active frontal
air bag, unless the air bag is turned o.
Choose the proper Child Restraint Belt Path
1. REAR-FACING SECTION
2. FORWARD-FACING SECTION
3. BOOSTER MODE SECTION
• Rear-Facing: 5-45 lbs (2.3-20 kg) and whose height is
44 inches (112 cm) or less.
• Forward-Facing: 20-65 lbs (9.1-29.5 kg) and whose
height is 57 inches (144 cm) or less.
• Booster Use: 50-120 lbs. (22.7-54 kg) and whose
height is 57 inches (144 cm) or less.
• Infants who weigh less than 20 lbs (9 kg) and are
under 1 year old, MUST use this car seat Rear-Facing.
For newborn infants, you must consult the infant’s
doctor before using this Child Restraint. A newborn
infant may have diculty breathing or have other
medical problems when placed in a seated position.
Before installing this Child Restraint in a vehicle, be
sure to also check the vehicle owner’s manual for
information on proper installation.
Check all installation configurations before discarding
the box. Diono cannot guarantee proper fit in all
vehicles.
SAFE USE CHECKLIST

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ALWAYS install this Child Restraint in the back seat.
The back seat is the safest place for children 12 and
under. See your vehicle owner’s manual for Child
Restraint installations and instructions.
According to accident statistics, children are
safer when properly restrained in the rear seating
positions than in the front seating positions.
Child restraint systems should be securely belted
to the vehicle, even when they are not occupied.
In a crash an unsecured child restraint system may
injure other occupants.
Rear-Facing: Harness straps MUST be at or just
below the child’s shoulders. Top of head must be 1.5
inches below the top of the car seat shell.
Forward-Facing: Harness straps MUST be just above
the child’s shoulders. Top of child’s ears MUST be
below top of car seat shell.
Booster Mode: Child MUST be secured using ONLY
the vehicle Lap and Shoulder Belt. Child MUST weigh
at least 50 lbs, with shoulders positioned at the 4th
slot and remain properly seated for the entire ride.
SAFE USE CHECKLIST
Choose a suitable location for this car seat
in your vehicle. REVIEW VEHICLE SEATING
LOCATIONS.
Install this car seat tightly in your vehicle.
Grab the sides of the seat where the vehicle
seat belt or LATCH strap is and slide the car
seat side-to-side and front-to-back. If the
seat moves less than 1 inch (2.5 cm), it is tight
enough.
Secure harness snug and flat on your child.

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• NEVER leave Child Restraint unsecured in your
vehicle even when it is unoccupied. It could injure
other occupants in a sudden stop or crash.
•DO NOT use any accessories, inserts or products not
included with this Child Restraint, unless approved by
Diono. Items not tested with this child restraint could
injure your child.
• DO NOT use this child restraint system if it has been
in a vehicle accident. You MUST replace this Child
Restraint if it has been involved in a crash, even if you
cannot see visible damage. A damaged Child Restraint
may not protect your child in a future crash.
• DO NOT modify your Child Restraint.
• NEVER remove harness from Child Restraint without
following the proper removal and installation
instructions available from Diono.
• DO NOT use Child Restraint without seat cover
installed.
Contact us by visiting the Diono website at us.diono.com
or call 1-855-463-4666.
•NEVER install in rear facing, side facing or on the back
of a folded down vehicle seat.
• ALWAYS secure this Child Restraint with the vehicle’s
child restraint anchorage system (LATCH) if available
OR the vehicle seat belt.
•DO NOT use the lower anchors of the child restraint
anchorage system (LATCH system) to attach this child
restraint Rear-Facing when restraining a child weighing
more than 35lbs (15.8 kg) or Forward-Facing when
restraining a child weighing more than 40lbs (18 kg)
with the internal harnesses of the child restraint. The
top of child’s head should not be less than 1.5 inches
from the top of the car seats shell.
•ALWAYS use the top tether strap on this child restraint
when installed Forward-Facing, if a tether anchor is
available.
• NEVER use Child Restraint in a vehicle seating
position where it cannot be secured tightly.

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EXPIRATION:
• DO NOT use the child restraint if any part is
damaged or broken, expired (over 10 years from date
of manufacture), missing instructions, missing parts,
or if the straps are cut, frayed, or damaged in any way.
Call 1-855-463-4666 to find out if the damaged part
or parts can be replaced.
SAFE PRACTICES
•DO NOT leave loose objects, such as books, bags,
etc., in the back of the vehicle. In the event of a sharp
turn, sudden stop, or crash, loose objects can be
thrown around and possibly cause serious injury to
vehicle occupants.
• ALWAYS check all surfaces of restraint before
securing your child. In warm weather, child restraints
can become very hot. Do not allow children to play
with vehicle seat belts.
NOTES

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PARTS LISTING
radian 3 RX
PARTS AND FEATURES
RX
radian 3 RX
1. LATCH Storage
2. Top Tether
3. Safe Stop
4. Belt Locking Clip
5. Belt Storage Pocket
6. LATCH Routing Pocket
7. Instruction Manual Storage
8. Harness Straps
9. Harness Pads
10. Chest Clip
11. Buckle
12. Buckle Pad
13. Expandable Sides
14. Harness Release
15. Harness Adjuster Strap
16. Detachable Rear-facing Base
17. Rear-facing Top Tether Connecting Strap
18. Cup Holder
19. Infant Support
20. Lap Belt Cushion

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VEHICLE SEATING LOCATIONS
WHAT IS LATCH?
Most vehicles manufactured after September 1, 2002
are equipped with LATCH (Lower Anchors and Tethers
for CHildren). Check your vehicle owner’s instruction
manual to determine LATCH lower anchor compatible
seating positions. Some vehicles owner’s manuals use
the term “ISOFIX” instead; LATCH can also be used in
vehicle seating positions that are equipped with ISOFIX.
Look for the LATCH symbol that may be visible by the
crease of the rear seat.
WARNING: DO NOT USE the lower anchor belts to
attach this Child Restraint rear-facing when restraining
a child weighing over 35 lbs (15.8 kg) or forward-facing
when restraining a child weighing over 40 lbs (18 kg).
DO NOT install using both the lower anchorage
connectors and the vehicle seat belt at the same time.
VEHICLE SEATING LOCATIONS
The safest seating position is one that works best for
your specific car seat, family and vehicle model.
Before installing this child restraint you must determine
the method of installation and the best vehicle seating
position for that method. This child restraint can be
installed either using LATCH or the Vehicle Seat Belt.
DO NOT install using both methods at the same time.
When determining whether the Diono RX Car Seat can
be used with lower anchors in the rear center seating
position, it is critical that you refer to your vehicle owner’s
instruction book. If the RX does not install best in the
rear center seating location, it is recommended to
move to one of the outboard seating positions.

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VEHICLE SEATING LOCATIONS
Install Child Restraint Correctly
NEVER PLACE THIS CHILD RESTRAINT REAR-FACING
IN A VEHICLE SEATING LOCATION WITH AN ACTIVE
FRONTAL AIR BAG, UNLESS THE AIR BAG IS TURNED
OFF. If the airbag inflates, it can cause serious injury
or death to your child. For vehicles with side air bags,
refer to your vehicle owner’s manual for information
on your child restraint installation.
Take care to secure the child properly. Snugly adjust
the harness straps provided with this child restraint
around your child. A snug strap should not allow any
slack. It lies in a relatively straight line without sagging.
It does not press on the child’s skin or push the child’s
body into an unnatural position.
•ALWAYS check to ensure buckle is securely latched.
• NEVER leave child unattended. Do not allow
children to play in or around the Child Restraint. Child
may become tangled in harness straps and suocate
or strangle.
• ALWAYS keep child properly secured in harness
whenever child is in Child Restraint.

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VEHICLE SEATING LOCATIONS
The following types of Vehicle Belts CANNOT BE
USED with your child restraint.
If any of the belt types listed below are in the chosen
seating position, you MUST choose another seating
position or use LATCH if available.
Please refer to your Vehicle Owners Manual for
specific information about seat belts and their use
with Child Restraints.
1. Motorized (Automatic) Vehicle Belts.
2. Dual Retractor Lap/Shoulder Belts
3. Non-Locking (ELR) Lap Belts
4. Inflatable Seat Belts *
5. Door Mounted Vehicle Belts
* ONLY Ford Inflatable seat belts are allowed to be
used with this Child Restraint. No other inflatable seat
belts have been tested with this Child Restraint.
*

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TOP TETHER
WHAT IS TOP TETHER?
A tether is designed to reduce movement of a rear-
facing and forward-facing child restraint in a crash and
aids in the achievement of a tight installation.
Vehicle tether locations can be found in many
locations within the vehicle. Some of the typical
locations are shown here. Please refer to your vehicle
owner’s manual for exact locations, requirements, and
anchor identification points.
WARNING: Rear-facing Top Tether connector strap is
ONLY to be used in rear-facing installations.
1. Locate the track of vehicle seat that is bolted directly
to vehicle frame.
2. Wrap tether connecting strap around the track, and
thread metal “D” ring through the loop at the end of
the tether connecting strap. Pull strap to form a knot.
3. Now, use metal “D” ring as an anchorage point for
top tether metal hook.
LEG OF
SEAT TRACK
Rear-Facing Top Tether Installation
REAR
SHELF
BACK
WALL
BACK
OF SEAT
FLOOR
OF VEHICLE
Forward-Facing Top Tether Installation

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UNFOLDING AND FOLDING:
1. Place car seat on its back on a flat surface and
unfasten red carry strap from the bottom. Be sure the
harness adjuster moves freely and is not locked within
the bottom of the seat.
2. Rotate bottom until your hear it “click”, this
confirms the car seat is locked for use.
3. Check proper operation — Pull harness adjusting
strap until harness begins to tighten. If it does not
tighten freely, check the belt path on the back of the
seat bottom is clear from obstruction. If necessary,
unfold seat by releasing the levers as shown and
repeat the above steps.
4. Tuck the red strap through the harness slot and
store behind the cover.
5. To fold, push lever shown and secure with red strap.
FIRST SETUP HARNESS SETUP
HARNESS SETUP
1. Place Your Child in the Seat.
Make sure their back is flat against the car seat back.
(This can be done in or out of the car). Avoid bulky or
heavy clothing because they will prevent the harness
straps from being tightened properly at first fitment.
2. Place Harness Straps over Child’s Shoulders and
Legs and Buckle.
You will hear a “click” when buckle tongues are
securely attached. Pull up on each buckle tongue to
make sure it is securely attached.
3. Be Sure the Harness Straps Are at the Proper Height.
Rear-Facing: Harness straps MUST be at or just below
the child’s shoulders. Top of head must be 1.5 inches
below the top of the car seat shell.
Rear-Facing
(Harness AT or just below shoulders)
CLICK
Folding
release
lever

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INITIAL SETUP
1
REAR FACING
installation instructions
REAR FACING FORWARD FACING BOOSTER MODE
Forward-Facing: Harness straps MUST be just above
the child’s shoulders. Top of child’s ears MUST be
below top of car seat shell.
Check all installation configurations before discarding
the box. Diono cannot guarantee proper fit in all
vehicles.
Children above 30 lbs
must use the Forward
Most Buckle Slot ONLY!
Children 20-30 lbs
must use the Middle
Buckle Slot ONLY!
Forward-Facing
(Harness just above shoulders)

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REAR-FACING INSTALLATIONS:
5-45 lbs (2.3-20 kg)
Infants who weigh less than 20 lbs (9 kg) and are
under 1 year old, MUST use this car seat
Rear-Facing.
Place car seat rear-facing in the vehicle back seat.
Make sure LATCH strap or vehicle seat belt is
routed through the rear-facing belt path marked
with the blue label and rear-facing illustrations.
Install this car seat tightly in your vehicle. The car
seat should not move at the rear-facing belt path
location by more than 1 inch (2.5 cm) from side-to-
side, front-to-back. If using a lap belt only, refer to
your vehicles owners manual for installation advice.
Harness straps MUST be at or just below the top of
your child’s shoulders. Place the chest clip at armpit
level.
The American Academy of Pediatrics (AAP) and
NHTSA recommend that children be rear-facing
until they reach the maximum rear-facing height
and weight. This car seat can remain rear-facing up
to 45 lbs.
Rear-facing top tether is available.
REAR FACING REAR FACING

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REAR FACING REAR FACING
INSTALL USING LATCH: 5-35 lbs (2.3-15.8 kg)
Do Not Install by this method for a child weighing
more than 35 lbs (15.8 kg). Reinstall with vehicle belt
for weights between 35-45 lbs (15.8-20 kg).
1. Install Detachable Rear-Facing Base.
Align posts as shown in grey by aligning the color
coded dots. Slide the base into place to align the
dots Blue to Blue, Yellow to Yellow. Once aligned,
press the lever shown into the seat base to engage.
Confirm base is locked and does not move.
123
2. Remove LATCH Strap from Storage Location on
Back of Seat.
Fold down cover on back of car seat. Locate the
LATCH Strap in the belt storage location shown. Push
in on the red buttons on the LATCH connectors and
remove from storage position 1.
3. Extend the LATCH Strap.
For easier installation, extend the LATCH strap to its
maximum length by pressing the grey button and
pulling on the strap.

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4. Place LATCH for Access to
Rear-Facing Belt Path. Unzip the
pocket to the right side of the latch
storage area, this will allow you to
move the latch connectors down
to the rear-facing belt path. Feed
LATCH connectors down, keeping
under the cover and out the
bottom. Once completed, close
the zip pocket.
5. Place Car Seat Rear-Facing in
Back Seat of the Vehicle.
Place rear-facing in vehicle seat
and center the car seat between
the lower LATCH anchors. The
entire seat bottom should sit flat on
the vehicle seat.
6. Locate the LATCH Strap in the
Rear-Facing Belt Path.
Thread the LATCH strap through
the rear-facing belt path (marked
with the blue label) and out the
other side. The LATCH belt should
lie flat and not be twisted.
REAR FACING
7. Attach LATCH Connectors to
Vehicle’s Lower LATCH Anchors
and listen for audible click to
confirm engagement.
8. Tighten the LATCH Strap.
Press down firmly in the center of
the car seat while tightening the
LATCH strap. You may need to
tighten further by pulling upwards
in-line with the belt path as shown.
9. Test for Tightness.
Grab the side of the seat with
one hand where the LATCH strap
is and slide the car seat side-to-
side and front-to-back. If the seat
moves less than 1 inch (2.5 cm),
it is tight enough. Do not test by
grasping the top or front of the
seat.
10. To Remove LATCH Strap From
Vehicle — Push in on the red
buttons on the LATCH connectors
and pull them o the anchor bars.
REAR FACING
6

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REAR FACING REAR FACING
INSTALL USING LAP/SHOULDER BELT WITH
5-POINT HARNESS : 5-45 lbs (2.3-20 kg)
1. Place Car Seat Rear-Facing in Back Seat of the
Vehicle with Detachable Rear-Facing Base Installed
(Page 32). The entire seat bottom should sit flat on
the vehicle seat.
2. Route the Vehicle Seat Belt.
Thread the vehicle seat belt through the rear-facing
belt path (marked with the blue label) and out the
other side. Buckle it. The seat belt should lie flat and
not be twisted.
3. Tighten the Vehicle Seat Belt.
In most vehicles today, slowly pull the shoulder belt
all the way out and then let it go back in. You will
hear a clicking sound as the belt retracts. Slowly pull
out on the belt and it should be locked. If not, please
review your car’s owner manual.
Press down firmly in the center of the car seat. To
tighten, pull from the shoulder belt on the side
nearest to the buckle while feeding the slack back
into the retractor.
4. Test for Tightness.
Grab the side of the seat where the vehicle seat
belt is and slide the car seat side-to-side and
front-to-back. If the seat moves less than 1 inch (2.5
cm), it is tight enough. Do not test by grasping the
top or front of the seat.

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REAR FACING
3. Tighten the Vehicle Seat Belt.
Press down firmly in the center of the car seat. To
tighten, pull on the loose end of the vehicle lap belt
to tighten it.
4. Test for Tightness.
Grab the side of the seat where the vehicle seat belt
is and slide the car seat side-to-side and front-to-
back. If the seat moves less than 1 inch (2.5 cm), it
is tight enough. Do not test by grasping the top or
front of the seat.
INSTALL USING 5-POINT HARNESS WITH:
LAP BELT: 5-45 lbs (2.3-20 kg)
1. Place Car Seat Rear-Facing in Back Seat of the
Vehicle with Detachable Rear-Facing Base Installed
(Page 32). The entire seat bottom should sit flat on
the vehicle seat.
2. Route the Vehicle Seat Belt.
Thread the vehicle seat belt through the rear-facing
belt path (marked with the blue label) and out the
other side. Buckle it. The seat belt should lie flat and
not be twisted.
REAR FACING