Richbum

So sometimes when I start up the car, I hear a small noise coming out of what I think is the passenger side speaker. Sorta sounds like a little chirping bird or something. Even with the radio turned on or off I still hear it. I know its not coming out of the engine or anything because it still makes that noise when i turn the car off but leave it in accesory mode where you can play with the navi/sound system etc.

The thing is.. after driving for a bit, the noise would just suddenly go away. Then I would hear it again maybe a day or two later. WHAT IS THIS NOISE. its not large enough to be a huge nuisance, but its there.

Anyone know what the hell this is? Im probably going to eventually take it to the dealership because I'm under warranty, but what if they cant find what the problem is.. because it randomly comes and goes.