i was just outside getting something out of my car and i heard a humming noise from the driver's door. it only last a couple of seconds and then after a minute or two it hums again for a couple of seconds. it is doing that over and over and i never really notice it before. so what in my door could it be. i took my speaker out cause i thought it was coming for it but it wasn't. let me know if any of you have experienced this or if you know what it is.

 

take apart the door and see what's inside.

the only thing I think could be making a sound would be the power window motor or the power locks motor.