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Mine squeaks on the passenger side. I rarely have a passenger so I've been putting off fixing it. But yesterday I drove this girl around and squeaked every time I drove over uneven surface. Very annoying. I'll look into too.
Check to make sure it's not the seatbelt that's squeaking. In a post above I stated that it seems to happen specially when I turn to look behind me, most often in a parking lot. On a whim, I grabbed my seatbelt at my chest and pulled it slightly out-in-out-in. Sure enough, I believe I heard the same squeak. Don't know how to fix it, though.