Safety 1st onBoard 35 User manual

onBoard 35, onBoard 35 Air
onBoard 35 Air +
onBoard Air 360
Infant Car Seat
Model shown may be different than
model purchased.
KEEP INSTRUCTIONS FOR FUTURE USE
Read all instructions before
using this car seat.
WARNING Failure to follow the
warnings on the labels and in the
instruction manual can result in
serious injury or death
to your child.
4358-8078
8.26.20
www.safety1st.com

Quick NavigationOverview
Welcome to the Safety 1st family and 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:
Your child’s safety is worth the time it will take
for you to read and follow these instructions.
Ready? Let’s go!
Pages 1-3 will introduce you to the parts of the car seat.
Page 58 has our contact information. If at any point you would like
assistance, please feel free to reach out to us.
Adjust Car Seat to Fit Your Child
Measure Your Child
Install Car Seat into Your Vehicle
Snugly Secure Your Child in Car Seat
REAR-FACING
4-35 lb (1.8-15.9 kg) and
32 in. (81.3 cm) or less in height
PAGE 6
Rear-Facing Child Fit PAGE 8
Adjusting Car Seat PAGES 9-18
Securing Child PAGES 19-20
Vehicle Belt
PAGE 28
Vehicle Belt
PAGE 38
Lower
Anchor Belt
PAGE 32
Install
with
Base
Install
without
Base

Contents
Getting Started
Parts of Car Seat................................................................. 1
Accessory Use ................................................................... 3
Rear-Facing Use Requirements ......................................... 6
Preparing Car Seat for Child Fit............................................. 7
Rear-Facing Child Fit ......................................................... 8
Making Adjustments to Car Seat
Changing Harness Strap Position ....................................... 9
Changing Buckle Position................................................... 11
Harness System Adjustments for Smaller Infants ............. 13
Removing and Installing Car Seat to Base......................... 15
Base Use............................................................................. 16
Canopy Use ......................................................................... 16
Carrier Use .......................................................................... 18
Securing Child in Car Seat ........................................ 19
Choosing LATCH or Vehicle Belt
LATCH: Lower Anchor Use .................................................. 21
Vehicle Belts ...................................................................... 23
Installation in Vehicle
Rear-Facing Use with Base ............................................... 27
Vehicle Belt Install .............................................................. 28
LATCH: Lower Anchor Belt Install........................................ 32
Rear-Facing Use Without Base .......................................... 37
Vehicle Belt Install .............................................................. 38
Wash & Care of Car Seat Parts
Removing Harness System ................................................... 41
Removing Seat Pad Set for Cleaning ..................................... 44
Cleaning Parts of Car Seat and Installing Seat Pad Set..... 46
Installing Harness System ................................................. 47
Safety Information
Aircraft Information .......................................................... 50
Replacement and Expiration of Car Seat ............................ 51
Child Restraint Use............................................................... 52
Installation in Vehicle............................................................ 52
Vehicle Seating Position ....................................................... 53
Registration and Safety Notices............................................. 54
Additional Information
Warranty ............................................................................. 55
Troubleshooting ................................................................... 56
Replacement Parts List ........................................................ 57
Dorel Juvenile Group Information........................................... 58
© 2020 Dorel Juvenile. All Rights Reserved.

2
Parts of Car Seat
1
Vehicle Belt
Path Guide
(when used
without the
base)
Harness
Adjustment
Strap
Carry
Handle
Head Pillow*
(On Select
Models)
Base
Release
Handle
Base
Release
Handle
Instruction
Manual
Storage
Adjustable
Base
(On Select
Models)
Carry Handle
Adjustment
Button
Base Belt
Path
Shell
(car seat)
Canopy
Harness
Release
Lever
(under flap)
Chest Clip
Harness System Detail
*See pages 3-5 for Accessory Use.
Model shown may be different than model purchased.
Buckle
Harness
Straps
Shoulder
Harness
Slots
Shoulder
Harness
Slots
Harness
Strap
Splitter
Plate
Harness
Ajustment
Strap
Lock Bars LATCH:
Lower
Anchor
Belt
Base
Alignment
Slots Lower
Anchor Belt
Storage
Base
Buckle Slot
Base
Attachment
Hooks
Body Pillow*
(On Select
Models)

Body Pillow (On Select Models)
To remove, pull buckle through the slot in
bottom pillow and slide the pillow out from
behind the harness straps.
Head Pillow (On Select Models)
Loosen the harness straps.
To remove, pull it up from behind the
body pillow.
You must use the body pillow in order to
use the head pillow.
43 Accessory Use
Harness Covers (On Select Models)
Harness covers help provide comfort to
the neck.
If harness covers will not allow proper
positioning of the chest clip or interfere
with getting a tight enough fit for a smaller
baby, remove and do not use.
Store until child is large enough to use
these harness covers while maintaining a
properly fitting harness.
To remove harness covers, pull the
fastening strips apart and remove harness
covers.
Lower Infant Insert
(On Select Models)
To remove, loosen the harness straps
and unbuckle the buckle and chest clip.
Unthread the harness straps from the
splitter plate. Pull the harness straps
through the shoulder harness slots. Push
the buckle, chest clip, and harness strap
through the slots in lower infant insert.
Remove buckle by inserting the buckle’s metal retainer up through the
car seat and pad.
Remove the insert.
Replace the buckle.
Rethread the harness straps and attach them to the splitter plate.
Reverse to install the infant insert.
Upper Infant Insert
(On Select Models)
To remove, loosen the harness straps.
Unthread the harness straps from the
splitter plate. Pull the harness straps
through the shoulder harness slots and
remove the insert. Rethread the harness
straps and attach them to the splitter plate.
Reverse to install the infant insert.
Make sure the slots in the insert are aligned with the shoulder
harness slots in the shell that are in use.
PUSH
PUSH
Infant Insert (On Select Models)
The infant insert must not cover your
child’s face in any way.
Remove the infant insert when your child’s
head has reached the top inside part of the
insert.