I think the volume control on the stereo is messed up, you should have it louder.
Ha ha joking aside, I had a similar squeak let your seats down and see if it goes away. If it does try lubing the metal latches there, that is what fixed mine.
ok, I went offroad and the sqweek went away a bit. went to toyota and gave me all sorts of excuses like rear seats, stuff in the back, trailer hitch. they did nothing. the noise went away cant hear it anymore.
stupid gremlins!
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