HelloCustomer What GW wants you to do, it to remove the headlight switch out of the dash board and try to plug it in outside of it's normal location. He wants you to see if the switch itself is buzzing or something else inside the dash. This would be the first step and we can see where we go from this point.
Your JA Expert,
Ok, the main reason we want to try this with the switch, is simply to find out if the switch is buzzing or something behind it. Let me know what you find and we'll try to get to the bottom of this for you.