I am not familliar with the 18i-TB, but on my older Fanuc controls, there is a physical screw terminal in one of the IO boards which you can jump out - which effectively bypasses all of the door switches.
New or old, I'm sure there is still a similar terminal on an IO board on your control. If you have the wiring diagrams that came with your control it will tell you which terminal number it is, and you will be able to figure out what terminal number is used for the common to jump it to.


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