If your noise is coming from inside the cabin, it could be your passenger side window. I had the same problem with my driver's side window. Try to lower the passenger side window about half way, then close it tightly (keep holding the switch for 2 more seconds after it closes). When it's closed, tap on the switch just for an instant, so the window will lower just by a hair, but is still closed. The sound should stop, at least it did for me. It's worth a try and it won't cost you a penny.