Door Function Switch?

[shooterchief]

Okay, please don’t laugh at me on this one.
I have a button in the overhead of my ‘17 250. The manual calls it a “Door Function Switch.” I cannot find in the book what it’s for, nor have I found info while searching on the ‘net.
Could someone please explain this thing to me?

 

[skeeter]

Shuts off the door light when back light is amber (OFF glows amber). Allows you to open doors without having the overhead lights coming on.

 

[shooterchief]

Oh! Ok.

Thanks for the response.