Hello and welcome to Justanswer!
I see that your question has been up for an extended time without a response and while although this vehicle is not in my area of greatest expertise I would like to try to help.
I'm wondering if you are hearing the headlamp leveling motor trying to run on it's own. There is a motor on the back of each headlamp that is controlled by a module to change headlamp height based on input from sensors on the rear suspension. You may have a bad headlamp motor or issue with the headlamp itself preventing full travel, or there could be an issue with the module driving the actuator when it shouldn't.
I'll have it checked out. Thanks.