Question Britax install in Toyota Sienna


New member

I have installed two britax seats in the middle row captain chairs of our 2014 Sienna. I have a britax frontier and a britax pioneer. The back tether strap on both of these seats come from the britax seats on the top corners of the car seats. The captains chair don’t seem wide enough, so the tether straps end up sliding down the sides of the captains chairs. I’m curious how to install these seats correctly in my van with out the tether sliding down the seats and making them unsafe. What am I missing?


Admin - CPST Instructor
Staff member
Do you know how to tie a tie? Until you get a tether extender from Britax, use the extra tether strap to tie the tether in a tie. That will hold the tether in more of a Y shape for now. When the tether extender comes, that will move the tether point up, shortening the tether, which means it'll be flatter up higher, so it won't slip off of the sides of the captain's chair.


Car-Seat.Org Facebook Group

Forum statistics

Latest member

You must read your carseat and vehicle owner’s manual and understand any relevant state laws. These are the rules you must follow to restrain your children safely. All opinions at Car-Seat.Org are those of the individual author for informational purposes only, and do not necessarily reflect any policy or position of Carseat Media LLC. Car-Seat.Org makes no representations as to accuracy, completeness, currentness, suitability, or validity of any information on this site and will not be liable for any errors, omissions, or delays in this information or any losses, injuries, or damages arising from its display or use. All information is provided on an as-is basis. If you are unsure about information provided to you, please visit a local certified technician. Before posting or using our website you must read and agree to our TERMS.

Graco is a Proud Sponsor of Car-Seat.Org! Britax is a Proud Sponsor of Car-Seat.Org! Nuna Baby is a Proud Sponsor of Car-Seat.Org!

Please  Support Car-Seat.Org  with your purchases of infant, convertible, combination and boosters seats from our premier sponsors above.
Shop travel systems, strollers and baby gear from Britax, Chicco, Clek, Combi, Evenflo, First Years, Graco, Maxi-Cosi, Nuna, Safety 1st, Diono & more! ©2001-2022 Carseat Media LLC