Hi,
I had a twisted seat belt. This is what did to fix it. At the bottom of the seat belt where it attached to the frame there is a plastic cover.
After removing the cover there will be a bolt which attaches the belt to the frame. Remove the bolt, untwist the belt, and replace the bolt, tighten bolt, replace cover and you are good
to go. This repair also eliminated that annoying rattle coming from where seat belt enters the top part of the pillar.
I do not know if this works on any other Toyota, but it might.
Hope this helps.
