This could be but do you have the switch in the Auto position? If so, we need to test the voltage coming out of the switch to the LCM on this circuits highlighted.
https://www.2carpros.com/articles/how-to-check-wiring
Basically we need to see if the switch is telling the LCM to keep the lights on or not. What I suspect is happening is what you are thinking that the switch is the issue. The reason is, when you have it set to off, the LCM should have a delay programmed into it. However, if the switch is shorted then it will tell the LCM to keep them on.
I attached the wiring diagrams below for your review. Let me know what questions you have and we can go from there. Thanks
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Sunday, February 28th, 2021 AT 1:45 PM