Hi,
Both the bolt and retainer need to be removed. As far as the noise, does it stop if you pull the parking light relay? Also, are you sure it isn't something shorting that causes the noise?
Next, you indicated replacing the multi-function switch. Was this the problem prior to replacement? Have you pulled the relay to check it? Here is a link that shows how that is done:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
If it is making a loud enough noise to record, upload it so I can hear what it is doing. Also, explain what you mean by only one light at a time works on the exterior. Does it change from one to the next?
Let me know.
Joe
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Saturday, July 24th, 2021 AT 7:21 PM