Chase LX 2-In-1 Booster: Booster Mode Setup Steps
By Car Seats, Strollers, & Baby Essentials | Evenflo® Official Site | Published: 2026-11-01
Category: How-to Guides
Learn how to switch the Chase LX 2-in-1 booster car seat to booster mode and route the vehicle belt correctly, with step-by-step checks for a safe fit.
Quick answer
To use the Chase LX 2-In-1 Booster Car Seat in booster mode, remove the harness according to the manual, position the seat so the vehicle belt routes through the correct guide, and buckle your child with the lap and shoulder belt flat and snug. Always confirm your child meets the seat's booster-mode weight and height requirements first.
When booster mode is the right next step
Move to booster mode only when your child has outgrown the harness limits for their current seat. The Chase LX accommodates children from 22 to 110 lbs, but the harness and booster modes have different limits, so check the manual for the exact booster minimum and maximum. If your child still fits the harness, keep using it—a harness typically provides a more secure fit for smaller children.
Highback vs. backless: choosing the configuration
The Chase LX is a 2-in-1 booster, meaning it can be used as a highback booster or converted to a backless booster. Use the highback configuration as long as your vehicle's seat back or headrest does not interfere with the booster's headrest and your child fits within the highback height limits. Switch to backless only when your child meets the backless minimums and the vehicle seat provides adequate head support. A highback booster offers more side support and helps position the shoulder belt, so it is often the better choice for younger or smaller booster riders.
Common belt-routing mistakes to avoid
The most frequent error is routing the shoulder belt under the child's arm or behind their back, which removes upper-body protection. Another is allowing the lap belt to sit over the soft part of the belly instead of low across the hip bones. Also check that the belt is not twisted and that the retractor locks when needed. The Chase LX's headrest is designed to let the vehicle belt self-adjust to your child's height in booster mode, but you still need to confirm the belt lies flat across the shoulder and chest.
Steps to set up and use the Chase LX in booster mode
- Confirm your child meets booster-mode requirements: Check the manual for the booster-mode minimum and maximum weight and height. The Chase LX fits children from 22 to 110 lbs overall, but booster mode has its own limits. Common mistake: assuming the harness limits are the same as booster limits. If your child is below the booster minimum, keep using the harness.
- Remove the harness correctly: Follow the manual to remove the harness straps and buckle. Store the harness and components together for future use. Common mistake: leaving the harness straps attached or routed incorrectly, which can interfere with the vehicle belt. Double-check that no harness parts remain in the belt path.
- Choose highback or backless configuration: Decide based on your child's height and your vehicle's head support. For highback, adjust the headrest so the shoulder belt guide is at or just above your child's shoulder. For backless, remove the back according to the manual. Common mistake: using backless when the vehicle seat back is too low to support your child's head. The highback mode is generally preferred until your child outgrows it.
- Place the booster on the vehicle seat: Set the booster flat on the vehicle seat, centered and facing forward. Ensure the vehicle seat belt buckles are accessible and not blocked. Common mistake: placing the booster over a seat cushion or uneven surface that prevents stable contact. The booster should not rock or slide easily when you test it.
- Route the lap belt low across the hips: Thread the lap belt through the booster's lap belt path (if provided) or position it low across your child's hip bones, touching the thighs. Common mistake: letting the lap belt ride up over the belly, which can cause injury in a crash. You should not be able to pinch slack in the lap belt after buckling.
- Position the shoulder belt across the chest: Route the shoulder belt through the booster's shoulder belt guide (highback) or across the center of the shoulder and chest. The belt should lie flat and not touch the neck. Common mistake: placing the shoulder belt under the arm or behind the back. The shoulder belt must cross the collarbone, not the neck.
- Buckle and tighten the vehicle belt: Buckle the seat belt and pull the shoulder portion to remove slack. The belt should be snug against your child. Common mistake: leaving the belt loose or twisted. Check that the belt retracts freely and locks when pulled.
Product facts
- Chase LX 2-In-1 Booster Car Seat - Support: The Chase LX Harnessed Booster features an innovative headrest design that allows the vehicle belt to self-adjust to your child’s height while in booster mode. This means you can raise the headrest as your child grows, and the belt should route correctly without a separate belt-positioning clip.
Chase LX 2-In-1 Booster Car Seat - Support - Chase LX 2-In-1 Booster Car Seat - Support: The seat accommodates children ranging from 22 to 110 lbs. Use this as a general range only—always confirm the specific booster-mode weight and height limits in your manual before switching.
