What does the push button on the floor in front of the drivers seat do?

Cleaning up under the drivers seat of my 2008 OTO and came across a rubber covered push button on the floor just in front of the seat. The electronics cover there has a carefully cut out and trimmed access hole for it. Can’t find any reference for it but it is obviously factory and has a distinct click when it is depressed. Haven’t clicked with the key or motor on so far but would rather know what it does before I fool with it again. Anyone have any ideas what it’s function is?? I hope I haven’t missed some obvious reference somewhere.

 

Here’s a picture. The cover is formed so that it’s rises to clear it
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So I did miss the obvious. If I click it does it toggle on and off?.Probably best to not find out .