diono radian owners manual

The Diono Radian is a premium convertible car seat designed for children from 5 to 120 pounds, featuring steel alloy frame, superior side impact protection, fold-flat design for travel, adjustable headrest and harness, multiple recline positions, and advanced safety features. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting to Vehicle 7. Using the Car Seat 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Steel alloy frame, adjustable headrest, 5-point harness system, fold-flat mechanism, side impact protection, multiple recline positions.

FeatureDescription
Steel Alloy FrameProvides superior strength and durability
Adjustable HeadrestGrows with your child from 5-120 lbs
5-Point HarnessEnhanced safety with quick-adjust harness
Fold-Flat DesignEasy storage and travel convenience
Side Impact ProtectionEnergy-absorbing foam for added safety
Multiple Recline PositionsComfortable positioning for various ages
LATCH SystemEasy installation with Lower Anchors
Seat Belt InstallationAlternative installation method
Cup HolderRemovable for easy cleaning
Infant InsertAdditional support for smaller infants

Installation

Unpack and inspect contents. Read all instructions before installation.

  1. Choose installation location: Rear-facing for infants under 2 years; forward-facing for older children.
  2. LATCH installation: Attach lower anchors to vehicle LATCH points; tighten until secure.
  3. Seat belt installation: Thread vehicle seat belt through designated path; lock retractor.
  4. Check installation: Ensure seat does not move more than 1 inch side-to-side or front-to-back.
  5. Adjust recline angle: Use recline adjuster for proper angle based on child's age/weight.

WARNING! Always install according to vehicle and car seat manufacturer instructions. Improper installation can result in serious injury.

First-Time Setup

Prepare car seat for first use with proper adjustments.

  1. Adjust harness height: Position harness at or below child's shoulders for rear-facing; at or above for forward-facing.
  2. Set recline angle: Use angle indicator for proper positioning (30-45 degrees for infants).
  3. Install infant insert: For newborns and small infants under 20 lbs.
  4. Adjust headrest: Position to provide proper head support.
  5. Secure child: Place child in seat and fasten 5-point harness securely.

CAUTION! Harness should be snug - you should not be able to pinch any webbing at the shoulder.

Specifications

Controls and Settings

Access various adjustment points for proper fit and comfort.

Headrest Adjustment: Lift headrest upward to raise; press release button and push down to lower.

Harness Adjustment: Pull harness adjustment strap to tighten; press harness release button and pull straps to loosen.

Recline Adjustment: Use recline adjuster lever to change seat angle for proper installation.

LATCH Connectors: Push-button release for easy installation and removal.

Cup Holder: Snap into place on either side of seat; removable for cleaning.

Connecting to Vehicle

Secure car seat properly using LATCH system or seat belt.

  1. LATCH Installation: Attach lower anchors to vehicle LATCH points; tighten straps until secure.
  2. Seat Belt Installation: Thread seat belt through designated path; lock retractor or use locking clip.
  3. Top Tether (forward-facing): Attach top tether to vehicle anchor point and tighten.
  4. Final Check: Ensure seat moves less than 1 inch in any direction at belt path.

Tip: Use your body weight to press down on seat while tightening installation straps for secure fit.

Using the Car Seat

Proper usage for different stages and positions.

  1. Rear-Facing: For children 5-50 pounds; harness at or below shoulders; 30-45 degree recline.
  2. Forward-Facing with Harness: For children 20-65 pounds; harness at or above shoulders; use top tether.
  3. Booster Mode: For children 50-120 pounds; use vehicle lap-shoulder belt; position belt properly.
  4. Harness Adjustment: Ensure harness is snug; chest clip at armpit level.
  5. Headrest Positioning: Adjust to provide proper head support without pushing head forward.

WARNING! Never place rear-facing car seat in front of active airbag. Children should remain rear-facing as long as possible.

Safety Features

Advanced safety technologies for maximum protection.

Side Impact Protection: Energy-absorbing foam and deep wings provide enhanced head and body protection.

Steel Frame: Aircraft-grade steel alloy provides superior strength and durability.

5-Point Harness: Distributes crash forces evenly across strongest parts of body.

Quick-Adjust Harness: Easy one-hand adjustment for proper fit as child grows.

Reinforced Side Walls: Additional protection in side impact collisions.

Care & Cleaning

Proper maintenance for longevity and safety.

Remove cover and harness: Follow instructions for disassembly. Hand wash cover in cold water with mild detergent. Air dry completely. Wipe shell with damp cloth and mild soap. Do not use bleach or harsh chemicals. Do not machine wash or dry cover.

CAUTION! Always reassemble completely and correctly after cleaning. Do not use if any parts are missing or damaged.

Regulatory Information

FMVSS 213 compliant. This child restraint system conforms to all applicable federal motor vehicle safety standards. Manufactured for Diono. For customer service, visit www.diono.com or contact 1-855-463-4666. Copyright © 2025 Diono. All rights reserved.

Troubleshooting

SymptomPossible CauseCorrective Action
Seat moves too muchLoose installationReinstall using body weight to compress seat while tightening
Harness difficult to adjustTwisted straps/dirtCheck for twists in harness; clean harness system
Child slouchingImproper reclineAdjust recline angle; ensure proper installation
Headrest won't adjustObstructionCheck for objects blocking movement; press release button fully
LATCH connectors won't releaseDirt/debrisClean connector mechanism; ensure push button is fully depressed

Inspection: Regularly check for wear, damage, or expired components.

Service: 1-855-463-4666; www.diono.com

diono radian owners manual © - All Rights Reserved 2025