Diono Radian 3 RXT User manual

diono.com 1
READ INSTRUCTION MANUAL
before using this car seat
Car Seat Instructional Manual
All-In-One Convertible
4-120 lb (1.8-54 kg)
Radian 3RXT Safe+TM
® ®

2
WE LOVE TO HELP
Hello there, Welcome to the Diono family!
We’ve created
this lovingly engineered car seat to help keep your child
comfortable and safe with all of the goods and none of the
gimmicks. We look forward to lending a helping hand
each and every day.
Any questions?
Diono U.S.: 1-855-463-4666
Diono Canada: 1-866-954-9786
REGISTER THIS CAR SEAT
Certication
Safe Use Guide
Warnings
Car Seat Use After Collision
Parts
Vehicle Seating Locations
Vehicle Seat Belt Types
Latch Plates
Retractors
How To Lock Your Retractor
CONTENTS
6
8
9-13
14-17
18-19
20-21
22-23
24-29

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CONTENTS
LATCH/UAS
Belt Locking Clip
First Setup
A. Unfolding Car Seat
B. Harness Strap Placement
C. Buckle Slot Placement
D. Changing Harness Positon
E. Buckle Strap Slot Change
F. Harness Tightening
G. Adjusting Headrest
REAR-FACING INSTALLATION
Detachable Rear-Facing Base
Seat Bights
Anti-Rebound Bar (ARB)
Infant Support
LATCH/UAS Installation
Lap/Shoulder Belt Installation
Lap Belt Installation
FORWARD-FACING INSTALLATION
Top Tether
SafeStop™
Adjustable Bottom
80/20 Overhang Guidance
LATCH/UAS Installation
Lap/Shoulder Belt Installation
Lap Belt Installation
30
31
32-41
42-55
56-71

4
Lap Belt Cushion
BOOSTER MODE INSTALLATION
Aircraft Installation
Comfort Features
Cup Holder
Expandable Side WIngs
Harness Strap Removal
Harness Strap Replacement
Folding Car Seat
Seat Cover Removal
Care and maintenance
Warranty
72-75
76
77
78-79
80-81
82-83
84-87
88-89
90-92
CONTENTS

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NOTES

6
Please take a few moments to promptly ll out and return the attached card
or register online using the direct link to the manufacturer’s registration
website provided.
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 U.S., PO Box 77129, Seattle, WA 98177
or call 1-855-463-4666 or register online at: http://diono.com/product-
registration/
Diono Canada ULC, 2160 S. Service Rd. W.,Oakville, ON L6L 9Z9
Canada or call 1-866-954-9786 or register online at: http://diono.ca/
product-registration/
For future reference, in the case of a change of address, please take a
moment to ll out the following information:
Model Number:
Manufacture Date:
This information can be found either on the registration card or on the
manufacturing label located on the seat.
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.
REGISTER THIS CAR SEAT

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OUR STORY
Time. It goes so fast... Who would have thought that over
two decades have passed since we rst 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 are 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 & 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 & followers, some are supporters, tweeters, social
media magicians, miracle moms and devoted dads.
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 diono.com.
share your journey @diono social
or nd the latest news

8
This child restraint system conforms to all
applicable requirements of U.S Federal Motor
Vehicle Safety Standards (FMVSS) 213 and Canada
Motor Vehicle Safety Standards (CMVSS) 213,
213.1, 213.2.
This child restraint is certied for use in aircraft
only when in harness mode.
This child restraint is not certied 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 US Federal Aviation Administration (FAA)
strongly urge you to secure your child in a child restraint
system (CRS) or device for the duration of your ight. Please
contact the airline for their specic policies.
CERTIFICATION

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WARNING – failure to follow these instructions
and the product labels can result in serious
injury or death to your child.
Your child’s safety depends on you. Death or serious
injury can occur.
No child restraint 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 and height.
This child restraint is designed for use only with children
who weigh 4–120 lb (1.8–54 kg) and whose height is 57 in
(144 cm) or less in the following modes.
SAFE USE GUIDE

10
SAFE USE GUIDE
DO NOT place this car seat rear-facing in a vehicle
seating location with an active front air bag.
Choose the proper car seat belt path
1. REAR-FACING SECTION
2. FORWARD-FACING SECTION
3. BOOSTER MODE SECTION
Choose a suitable location for this car seat in your vehicle.
Review your vehicle seating locations.
Install this car seat tightly in your vehicle.
Secure harness snug and at on your child.
Rear-facing: 4–50 lb (1.8–22.7 kg) and whose height
is 18-44 in (46-112 cm).
Forward-facing: 22–65 lb (10–29.5 kg) and whose
height is 30-57 in (76-145 cm).
Booster: 40–120 lb (18–54 kg) and whose height is
40-57 in (101-145 cm).

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4 lb (1.8 kg)
22 lb (10 kg)
40 lb (18 kg)
50 lb (22.7 kg)
65 lb (29.5 kg)
120 lb (54 kg)
USE DETACHABLE REAR-FACING BASE
LAP/SHOULDER BELT ONLY
INSTALLATION
REAR-FACING
LATCH/UAS
LAP/SHOULDER BELT
LAP BELT
FORWARD-FACING
LATCH/UAS
LAP/SHOULDER BELT
LAP BELT w/ TOP TETHER
BOOSTER
50 50 50
35
MUST BE
REAR-FACING CAN BE REAR-FACING
22
WITH
SAFE STOP WITHOUT SAFE STOP
40
65
40
65 65
REMOVE 5-POINT HARNESS
WEIGHT
CAR SEAT WEIGHT GUIDE
SAFE USE GUIDE

12
SAFE USE GUIDE
Infants who weigh less than 22 lb (10 kg) or are under 1
year old, MUST use this child restraint 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 congurations before discarding the box.
Diono cannot guarantee proper t in all vehicles.
According to accident statistics, children are safer when
properly restrained in the vehicle's rear seating positions
than in the front seating positions.

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Rear-facing: Harness straps MUST be at or just below the
child’s shoulders. Top of head must be 1.5 in (3.8 cm) below
the top of the car seat shell.
Forward-facing: Harness straps MUST be 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/
shoulder belt. Child MUST weigh at
least 40 lb (18 kg), with shoulders
positioned at or above the 4th slot
and remain properly seated for the
entire ride.
ALWAYS install this child restraint in the back seat.
The back seat is the safest place for children 12 and under.
NEVER leave car seat unsecured in your vehicle even
when it is unoccupied. It could injure other occupants in a
sudden stop or collision.
4
SAFE USE GUIDE

!WARNING! !DEATH OR SERIOUS INJURY CAN OCCUR!
!
!
14
Never place this child restraint rear-
facing in a vehicle seating location with
an active front air bag. Death or serious
injury may occur. If an air bag inates,
it can hit the child or child restraint with
enough force to cause serious injury or
death to your child. For vehicles with side
passenger 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.
For any questions or concerns please contact diono at:
Diono U.S.:
1-855-463-4666 or online at www.diono.com
Diono Canada:
1-866-954-9786 or online at www.diono.ca

!DEATH OR SERIOUS INJURY CAN OCCUR! !
!
diono.com 15
• DO NOT use child restraint in any conguration not
shown in the instructions.
• DO NOT modify your child restraint.
• NEVER install in a seat that is 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/UAS) if
available OR the vehicle seat belt.
• NEVER use the restraint system in a vehicle seating
position where it cannot be secured tightly. A loosely
installed restraint system will not protect your child
in a collision.
• DO NOT use the LATCH/UAS system to attach this child
restraint rear-facing when restraining a child weighing
more than 35 lb (15.8 kg) or forward-facing when
restraining a child weighing more than 40 lb (18 kg).
• ALWAYS use the top tether strap when installed
forward-facing.

!WARNING! !DEATH OR SERIOUS INJURY CAN OCCUR!
!
!
16
• 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.
• NEVER remove harness from child restraint without
following the proper removal and installation
instructions (see pg 80).
• DO NOT use child restraint without seat cover installed.
• ALWAYS check seat belt or LATCH/UAS connectors to
ensure all buckles are 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.

!DEATH OR SERIOUS INJURY CAN OCCUR! !
!
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EXPIRATION
• DO NOT use the child restraint if any part is damaged
or broken, expired (over ten years from date of
purchase), missing instructions, missing parts, or if the
straps are cut, frayed, or damaged in any way. Call to
nd out if the damaged part or parts can be replaced.
Diono U.S.: 1-855-463-4666
Diono Canada: 1-866-954-9786
SAFE PRACTICES
• DO NOT leave loose objects, such as books, bags,
etc., in the back of the vehicle. In the event of a shARB
turn, sudden stop, or collision, 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.

18
CAR SEAT USE AFTER A COLLISION
UNITED STATES
The U.S. National Highway Trac Safety Administration
(NHTSA) recommends that car seats be replaced
following a MODERATE or SEVERE collision in order
to ensure a continued high level of collision protection
for child passengers. In the U.S., car seats do not
automatically need to be replaced following a MINOR
collision.
NHTSA defines a MINOR crash as one in which ALL of
the following apply:
• The vehicle was able to be driven away from the
crash site.
• The vehicle door nearest the car seat was not
damaged.
• None of the passengers in the vehicle sustained any
injuries in the crash.
• If the vehicle has air bags, the air bags did not deploy
during the crash; and
• There is no visible damage to the car seat.
NEVER use a car seat that has been involved in a
MODERATE or SEVERE collision.

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CAR SEAT USE AFTER A COLLISION
CANADA
• DO NOT USE THIS CHILD RESTRAINT SYSTEM IF
IT HAS BEEN IN A VEHICLE ACCIDENT.
• Transport Canada designates that you MUST
replace this child restraint if it has been involved in
a collision.
• You must dispose of your child seat or booster seat
if the child seat was in a vehicle during a crash. Even
if the child seat was empty or was not directly hit, it
may be damaged.
• You must dispose of your child seat or booster seat
if the shell is cracked or the webbing of the child car
seat is frayed, torn or discolored.

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PARTS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
17
19
20
21
22
18
23
24 26
16
25