3 months ago I bought a 2013 Toyota Rav 4. recently there is an annoying rattling coming from the passenger seat. It is obvious that it is coming from inside the seat it self. There must be a brace or something inside that has came loose. any ideas on how to fix it? The seat does not come apart easily. The vehicle is currently under warranty But not for much longer. Although I may be wrong but I do not thing the passenger seat would be covered under warranty. I would be grateful for any help.