Safety 1st onBoard 35 SecureTech User manual

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onBoard 35 SecureTechTM
Infant Car Seat
Your model may look dierent than one shown on cover.
Read all instructions BEFORE USING this car seat.
KEEP INSTRUCTIONS FOR FUTURE USE.
Failure to follow the warnings on the labels and in
the instruction manual can result in serious injury or
death to your child.
4358-8257 2.11.22
• Buckle Assembly
• Chest Clip
• Seat Pad Set
• Lower Anchor Belt
• Base
• Locking Clip
• Harness Straps
• Instructions
For parts availability and
questions, call, text, or chat.
If requested color is not
available, similar color will
be substituted.
Applicable tax and shipping
& handling will also be
added.
Replacement Parts List
(on select models)

Your child’s safety is
worth the time it will
take to read and follow
these instructions.
Ready? Let’s go!
Pages 1-8 will introduce
you to the parts of the car
seat.
The Back Cover of this
Manual has our
contact information.
If at any point you would
like assistance, please feel
free to reach out to us.
Welcome to the
Safety 1st Family!
Thank you for
choosing this car
seat, also known as
a child restraint!
To help you get
started using your
child’s new car seat,
here are the 4 main
tasks you’ll need to
complete.
Measure
Your Child
Install Car Seat
into Your Vehicle
Adjust Car Seat to
Fit Your Child
Secure Your Child
in Car Seat

©2022 Dorel Juvenile Group, Inc. Safety 1st
TM
and the Safety 1st logo and design are trademarks of Dorel Juvenile Group, Inc. [phone] www.safety1st.com.
Styles and colors may vary. Los estilos y los colores pueden variar. Made in CHINA. Hecho en CHINE. Distributed by (distribuido por) Dorel Juvenile Group, Inc., 2525
State St., Columbus, IN 47201-7494. Dorel Juvenile Canada, 2233 Argentia Road, Suite 110, Mississauga, ON L5N 2X7. Importado y Distribuido en Chile por: Comercial
e Industrial Silfa S.A. - San Ignacio 0201 / Parque Industrial Portezuelo Quilicura, Santiago Chile. Fono (562) 2339 9000. En Perú por: Comexa S.A. - Los Libertadores
455 – San Isidro, Lima – Perú. Fono (511) 4469014. En Centro América, Caribe y Ecuador por: Best Brands Group S.A. – Av. Balboa, Bay Mall Plaza, Planta Baja, local 9,
Panamá. - Fono: [phone]. En Colombia por: Baby Universe S.A.S. - Vía 40 No. 77-29, Barranquilla,Colombia - Fono: [phone] Importador:
DJGM, S.A. DE C.V. Gabriel Mancera No. 1041 Col. Del Valle, Benito Juárez C.P. 03100 México, Ciudad de México R.F.C. DJG140305GN9 Tel. (55)
67199202
Contents
1 Getting Started
1 Parts of Car Seat
4 Accessory Use
5 Canopy Use
7 Base Use
9 Rear-Facing Use
9 Car Seat Use
10 Rear-Facing
12 Rear-Facing Child Fit
14 Securing Child in Car Seat
17 Carrier Use
18 Vehicle Install with Base
47 Cleaning Parts of Car Seat &
Installing Seat Pad Set
48 Installing Harness System
53 LATCH & Vehicle Belt Information
53 LATCH: Lower Anchor Belt
55 Vehicle Belts
24 Attaching Car Seat to Installed Base
27 Removing Car Seat from Base
28 Vehicle Install without Base
33 Making Adjustments to Car Seat
33 Changing Harness Height
35 Changing Buckle Position
38 Harness System Adjustments
for Smaller Infants
42 Wash & Care
42 Removing Harness System
45 Removing Seat Pad Set
60 Safety Information
60 Child Restraint Use
61 Vehicle Seating Position
62 Installation in Vehicle
63 Replacement & Expiration
64 Registration & Safety Notices
65 Aircraft Information
66 Warranty

Harness Release Lever
(through opening in pad)
Harness Adjustment Strap
Body Pillow*
Harness System
*See page 4 for Accessory Use.
Rear-Facing
Level Line
Base
Canopy
Adjustable Base
(on select models)
Carry Handle
1 2
Parts of Car Seat
Chest Clip
Buckle
Harness Straps
Shoulder
Harness Slots
Your model may look dierent than one shown.
Base Release
Handle
Carry Handle
Adjustment
Button
Vehicle Belt
Path Guide
(when used
without the
base)
Head Pillow*

3 4
Accessory Use
Body Pillow
(on select models)
To remove, unbuckle the
harness. Pull the buckle
down through the slot in
the body pillow.
Slide it out from behind the
harness straps.
Head Pillow
(on select models)
When using the head
pillow, make sure it does
not cover your infant’s face
in any way.
To remove, from the back
of the head pillow gently
pull the fabric tabs out from
the shoulder harness slots.
To attach, slide the fabric
tabs into the shoulder
harness slots.
Base Belt Path
Lock Bars
Base
Alignment
Slots
LATCH:
Lower
Anchor Belt Base
Base
Release
Handle
Shoulder
Harness
Slots
Stroller
Attachment
Pins Harness
Strap
Splitter
Plate
Harness Adjustment
Strap
Buckle’s Metal Retainer
Instruction
Manual
Storage
Lockoff
Tension
Indicator

Undo Fastening
Strip on Back of
Car Seat
Locate Canopy Post
There is one on either
side of the car seat.
You only need to undo
one to remove the
canopy.
Pull Back
Canopy Fabric
to Locate Tab on
Canopy Post
Press Tab In With
Your Thumb &
Pull Canopy Hoop
Off Canopy Post
Slide Canopy
Fabric Off
Canopy Hoop
Reverse to put
back together.
5 6
1 2 3 4 5
To Remove Canopy
Canopy Use
To Adjust Canopy
Grasp the front or sides of the canopy hoop
and move it front to back to desired location.
Canopy Hoop
(plastic strip)
Canopy
(fabric)

7 8
Opening Release Lever
Lift the release lever to open the
Lockoff and to release the LATCH:
lower anchor belts.
Closing Release Lever
Push the release lever down to
close the Lockoff and to allow
the LATCH: lower anchor belts to
retract.
Tension Indicator
This base has indicators that show
when the LATCH: lower anchor belt
or vehicle belt have been securely
tightened.
The red will turn completely green
when tightened correctly. No red
should be showing.
This base has a release lever that
has two functions; one for LATCH:
lower anchor belts and one for
vehicle belts.
Lockoffs prevent the vehicle belt
from loosening after tightening.
Release Lever for Vehicle Belt Lockoff &
LATCH: Lower Anchor Belts
Base Use
To Lower Base Foot
Push in on the foot release
button and pull the foot all the
way down.
Lock the foot on the release
button as shown.
To Store Base Foot
Pull the foot down and press in on
the release button.
Push the foot up into the base to
the locked position.
Depending on your model, the base is adjustable.

In this car seat, your child can remain Rear-Facing
until they outgrow any one of the following:
• Weight Limit: 35 lb (15.9 kg); OR
• Height Limit: 32 in. (81.3 cm); OR
• Rear-Facing Child Fit requirements, see page 12.
Before installing the car seat in your vehicle, check your
child’s fit in the car seat.
This way you won’t have to redo the vehicle installation to
make adjustments to the car seat.
Rear-Facing Child Fit: Page 12
Rear-Facing Vehicle Install: Page 18
Rear-Facing
9 10
4-35 lb (1.8-15.9 kg) and 32 in. (81.3 cm) or less in height
Children under 1 year of age MUST ride Rear-Facing.
Your child’s height, weight, and age determine how the car
seat should be placed in the vehicle.
Children vary widely in body size, shape, and temperament—
please consult your doctor before switching between
any types or modes of a car seat within the limits and
fit requirements of the car seat.
State Laws
Please be certain to follow your state’s laws regarding car
seat use.
American Academy of Pediatrics
Recommendations
Infants and Toddlers
Should ride in a rear-facing car seat as long as possible, until
they reach the highest weight or height allowed by their car seat.
Toddlers and Preschoolers
Once they are facing forward, children should use a forward-
facing car seat with a harness for as long as possible, until they
reach the height and weight limits for their car seats.
School-Aged Children
Once they have outgrown their forward facing car seat, children
should use a belt-positioning booster seat until the vehicle’s
lap and shoulder seat belt fits properly. This is often when they
have reached at least 4 feet 9 inches in height and are 8 to 12
years old.
Older Children
All children younger than 13 years should be restrained in the
rear seats of vehicles for optimal protection.
Measure your child’s weight and height
(DO NOT guess) before using this car seat.
This car seat can only be used
REAR-FACING.
Car Seat Use
WARNING:

Your child’s bottom and
back should be flat against
the car seat.
Place Child in Car SeatUndo Chest Clip
& Buckle
It may be easier to undo
the buckle by pressing
in towards the top of the
button.
Fully Loosen
Harness Straps
Push down on the harness
release lever (through the
opening in the pad) while
pulling out on the harness
straps as shown.
1 2 3
Rear-Facing Child Fit
11 12
NEVER install a rear-
facing child restraint
in the front seat of a
vehicle equipped with
an active frontal airbag.
DO NOT use the lower anchor belt
along with the vehicle lap or lap/
shoulder belt.
DO NOT fasten multiple lower
anchor hooks on the same lower
anchor bar in the vehicle.
Check the vehicle belt or the lower
anchor belt before each use. Use
ONLY if the belt can be tightened
properly and locked securely in
place.
Even when unoccupied, this child
restraint MUST be firmly secured
to the vehicle with the lower anchor
belt or with the vehicle seat belt.
This child restraint MUST ALWAYS
face the rear of the vehicle.
WARNING:
continued on next page

13 14
Securing Child in Car Seat
Place Child in Car Seat
Your child’s bottom and back
should be flat against the car
seat.
Position the harness straps
over your child’s shoulders
and upper thighs.
Buckle Harness
Pull the harness straps up
to make sure the buckle is
locked.
Fasten Chest Clip
Insert right half of the chest
clip into the left half and
snap together.
Tighten Harness
Pull the harness adjustment
strap straight out to snugly
tighten the harness.
1 2 3 4
continued on next page
Check Buckle Position
• Use the slot closest to
your child.
• The buckle should
not be underneath or
behind your child.
1
2
3
Check Harness
Strap Position
The harness strap MUST
be at or slightly below
the shoulders; never
above.
Check Head Position
The top of your child’s head
MUST be at least 1 in.
(2.5 cm) below the top of
the car seat.
4 5 6
Buckle
Strap
Buckle To change the harness
strap height, see page
33.
To change the buckle
position, see page 35.
To learn how to check
harness tightness, see
pages 14-16.
If you cannot achieve
a snug harness fit for
your child, see pages
38-41.

15 16
Failure to fasten and tighten the harness
system correctly may allow the child to be
ejected from the child restraint in a crash
or sudden stop causing serious injury or
death.
DO NOT mistake comfort for safety. The
harness system MUST be snugly adjusted.
DO NOT put snowsuits or
bulky garments on your
child when placing them
in the child restraint.
Bulky clothing can
prevent the harness
straps from being
tightened properly.
FINISHED!
Your child is now secured in the car seat.
Check your child’s fit often and make any
needed adjustments to the car seat as
they grow.
To Remove Child from Car Seat:
1. Loosen Harness Strap
2. Unbuckle Harness
3. Release Chest Clip
4. Remove Child
Troubleshooting
1. If the buckle or harness
release lever sticks: DO NOT
lubricate. Check for dropped
food, sticky spilled drinks, dirt,
leaves, etc.
Clean with warm water and/or
remove the object with tweezers.
If you cannot get the harness to
adjust and remain tight with the
buckle securely locked, DO NOT
use this car seat.
2. If your harness twists:
Straighten the harness each time
you put your child in the car seat.
Lock the buckle and tighten the
harness so it will be ready for next
use.
WARNING:
Position Chest Clip
Slide the chest clip up the
harness straps and position
it at mid-chest (even with
armpits) and away from
your child’s neck.
Try to pinch the harness
at the shoulders vertically
between index finger and
thumb as shown.
If your fingers slip off, the
harness is tight enough.
If you can pinch the
harness strap, tighten more.
5 6
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 flesh or
push the child’s body
into an unnatural
position.
Check Harness Tightness

Review Vehicle Owner’s Manual
Determine what kind of vehicle
belts your car has and how to use
them to lock a car seat in place OR
where LATCH: lower anchor seating
positions are located in your vehicle.
There are 2 different methods for install.
Use only one:
Vehicle Belt
DO NOT use both the LATCH: lower anchor belt and vehicle belt
at the same time to install the base.
LATCH: Lower Anchor Belt
Vehicle Install with Base
17 18
continued on next page
OR
WARNING:
Carrier Use
To Adjust Carry Handle
Squeeze both adjustment buttons
on each side of the carry handle.
Rotate up or down to desired
location. Release buttons.
Make sure both carry handle
adjuster buttons are in the locked
position.
Carry handle MUST be upright
and locked when carrying and
when installed in the vehicle.
Read ALL instructions before using
child restraint as a carrier.
NEVER use carrier unless child is
properly secured.
Use only as a carrier by children
weighing 4-35 pounds (1.8-15.9 kg)
and 32 inches (81.3 cm) or less in
height.
NEVER leave child unattended.
Always keep child within arm’s reach.
Suffocation Hazard: Infant carrier
can roll over on soft surfaces and
suffocate child. NEVER place carrier
on beds, sofas or other soft surfaces.
Strangulation Hazard: Children have
STRANGLED in loose or partially
buckled harness straps. Fully restrain
the child even when carrier is used
outside the vehicle.
Fall Hazard: Child’s activity can
move carrier. NEVER place carrier
on counter tops, tables, or any other
elevated surface.
The carrier can
fall from the
shopping cart.
Do not use on
shopping cart.
Do not use the
carrier if it is damaged or broken, or if
any parts are missing.
WARNING:

continued on next page
19 20
3
For Vehicle Belt Install: Route Belt Through
Base Belt Path Openings As Shown
1 2
Place Base
Rear-Facing in
Vehicle
Center the base in the
chosen seating position.
Lift Release Lever Buckle Vehicle Belt
If your car has a switchable
retractor, you MUST also
use it to lock the belt. Review
page 55 of this manual or
your vehicle owner’s manual.
Attach Lower
Anchor Belt
Connectors to
Vehicle’s
Lower Anchors
4
OR

If the base moves more than
1 in. (2.5 cm), you can try:
• Pulling the belt tighter; OR
• Reinstalling the base; OR
• Changing to a different
seating location; OR
• Switching to a different
install method (LATCH or
vehicle belt).
You can also check the tightness by:
• Holding the base ONLY at the belt path with your
non-dominant hand.
• Pushing and pulling from side to side.
• The base should not move more than 1 in. (2.5 cm).
21 22
Check Tightness Indicator
The red will turn completely
green when tightened
correctly.
No red should be showing.
6
Push Release Lever Down & Push Down on
Base to Tighten LATCH Belt
You MUST push the release lever down in order for the
LATCH: lower anchor belts to tighten.
Then push down on the base to tighten the LATCH:
lower anchor belts. The belts will begin to automatically
retract and tighten as you push down.
5B
If the Lockoff
cannot be used
properly, then do
not install the base
using vehicle belt
installation.
Tighten Vehicle Belt & Then Push
Release Lever Down
Place your hand in the base and firmly push the base
down and back towards the vehicle seat. Pull the belt
towards you and parallel (in line) with the belt path as
shown.
5A
continued on next page
Vehicle Belt LATCH
OR

23 24
Attaching Car Seat to Installed Base
Secure Child in
Car Seat
See pages 14-16.
Attach Car Seat to Base
Pull up on the front two corners of the car seat by your child’s feet
to make sure it is locked to the base.
The carry handle MUST be upright and locked when
installed in the vehicle.
12
continued on next page
FINISHED!
Lap Belt
Lap/Shoulder Belt
LATCH: Lower
Anchor Belt
Vehicle Belt Install: Is the vehicle belt locked? See steps 4
and 5A.
LATCH: Lower Anchor Belt Install: Are the connectors
securely attached to the vehicle’s lower anchors? See steps 4
and 5B.
Is the belt tightened enough so that the tension indicator is
fully green? Check the tightness of the install often to make
sure it has not loosened. See step 6 and last info box on
page 22.

25 26
FINISHED!
Lap/Shoulder Belt Lap Belt LATCH: Lower
Anchor Belt
Check Level Line
Redo the base installation if the
level line is not parallel with the
ground.
Only if necessary, you may need to place
a tightly rolled towel(s) or foam pool
noodle(s) under the front of the base to
help make the level line parallel with the
ground
Check often to make sure padding is still
in place and the belt is tight.
3

27 28
continued on next page
Vehicle Install without Base
Review Vehicle Owner’s Manual
Determine what kind of vehicle
belts your car has and how to use
them to lock a car seat in place OR
where LATCH: lower anchor seating
positions are located in your vehicle.
Lap/Shoulder Belt Lap Belt
OR
To Remove Car Seat from Base
From the back of the car seat, slide the base
release handle up and lift the car seat out of
the base.
Removing Car Seat from Base

Secure Child in
Car Seat
See pages 14-16.
Place car seat
Rear-Facing in seat.
Check Level Line
The Level Line MUST be
parallel with the ground.
The carry handle must
be upright and locked
when installed in the
vehicle.
Route Vehicle Lap
or Lap Portion of the
Lap/Shoulder Belt
Through Belt Path
As Shown
123
29 30
Buckle Vehicle Belt
If your car has a switchable
retractor, use it to lock the
vehicle belt.
Review page 55 of this
manual or your vehicle
owner’s manual.
Tighten Vehicle Belt
Lay your forearm across
the car seat at the belt
path while pulling up on
the belt to tighten.
Check Belt Tightness
Hold the Rear-Facing Belt
Path with your non-dominant
hand. Push and pull the car
seat from side to side.
The car seat should not move
more than 1 in. (2.5 cm).
4 5 6
continued on next page

31 32
FINISHED!
Lap Belt
Lap/Shoulder Belt
Vehicle Belt Install: Is the vehicle belt locked? See step 4.
Is the belt tightened enough so that the car seat does not move
more than 1 in (2.5 cm) from side to side? Check the tightness
of the install often to make sure it has not loosened. See step 6
and info boxes on page 31.
Is the Level Line parallel with the ground? See step 7 and last
info box on page 31.
Recheck Level Line
Redo the installation if the
level line is not parallel
with the ground.
7
If the car seat moves more
than 1 in. (2.5 cm), you can
try:
• Pulling the belt tighter; OR
• Reinstalling the car seat;
OR
• Changing to a different
seating location. Only if necessary, you may need to place a
tightly rolled towel(s) or foam pool noodle(s)
under the front of the car seat to help make
the level line parallel with the ground.
Check often to make sure padding is still in
place and the belt is tight.

33 34
For Rear-Facing Child
Fit, see page 12.
To learn how to check
harness tightness, see
pages 14-16.
If you cannot achieve
a snug harness fit for
your child, see pages
38-41.
Check the harness
straps often for any
wear or damage.
sewn
end
45
Rethread Harness
Straps into Correct
Shoulder Harness
Slots for Your Child
For Rear-Facing Child Fit,
see page 12.
From Back of Car
Seat, Attach 1st
Harness Strap Loops
to Splitter Plate
As Shown
1 2
Fully Loosen
Harness Straps
Push down on the harness
release lever (through the opening
in the pad) while pulling out on
the harness straps as shown.
From Back of Car Seat,
Remove Harness Strap
Loops From Splitter Plate
Pull Harness Straps Out of
Shoulder Harness Slots
Changing Harness Height
3
The sewn ends of the harness
strap loops MUST face towards
you.
DO NOT twist the harness strap
or the harness adjustment
strap.
Make sure the harness strap
loops are fitted completely on
both sides of the splitter plate.