hgh pitched noise

[xBox]

Hello everyone, I have a bit of a problem with my '08 xB. Couple of days ago I noticed a high pitched noise coming from under the dashboard of my car. I checked to make sure that this noise is not coming from under the hood. I can hear the noise with ignition on and when it's completely turned off. When I took it to dealerships - techs there were simply puzzled. I do not have a navigation system or any other accessories other than what manufacturer has installed. Does anyone else have similar problem? The noise is just unbearable. please help!