When you say rear window are you talking about the pass-through rear window to the bed or one of the rear seat passenger door windows?When listening to music with the rear window open I was getting a ridiculous rattle/vibration. Audio settings at default and all types of music. Like you hear out of an import with a stereo worth more than the car. It was embarrassing and made listening to music unbearable. Thankfully there’s a TSB which took my dealer a few minutes to repair with a part that was available overnight. FYI.