At the moment don't know..haven't had the chance to look at it..
All I know it's coming from the left front side even though the audio system is off.
Only haopens when the car is moving and not in stationary position.
I think, (not sure though) it started after I installed an Alpine audio 554ebt system(with amp and woofer. Also tire sensors for air pressure/temp.! Not sure though..I don't have a sat nav.
I will thoroughly examine it after Monday.