If you run across a 2021 Toyota Sienna with the concern of squeak noise or a ticking noise coming from the rear seats then you may want to check out the seat frame Torx screws for looseness or cross threading. A TSB may be in the works...
Here is what you may find with some technicians adding a Teflon friction tape to the underside as a temporary "field fix"...
Here is what you may find with some technicians adding a Teflon friction tape to the underside as a temporary "field fix"...



