Tonight after I had been home for about an hour, I went out to my car to get the USB drive out to put some new music on it. It was really quiet outside and I noticed while I was inside the car, I could hear a faint buzzing sound. I was sitting in the passenger seat and realized it was coming from the A-pillar tweeter (Harman Kardon). Then I noticed that it was coming from the mid-range and woofer speakers on the passenger door as well. I went around the entire car and could hear the buzz in each and every single speaker in the car.

The car was off the whole time and the key was not in the ignition (I don't have comfort access). I didn't have my cell phone on me when I went out to the car. The buzz doesn't sound like EM interference. It sounds more like the end of a song when the music it and it's just silence with a faint sound to it.

Has this happened to anyone else? Does anyone have any ideas on what may be causing the buzz?

I've only had the car for two and half weeks. Thanks in advance!

 

It's normal. The radio comes on when you open the doors. This is to allow the door chimes, etc.

 

Does it ever stop or is it like a tree falling in the woods with no one around to hear it? Wouldn't this drain the battery?