Here's an exploded picture of the manual seat. Maybe this will help you get an idea of what needs to happen. If you look at part 23 on the list, this is the switch. The parts book shows the bracket but not the switch. It says it's for the air bag. I'm guessing since in the most-forward position, it hovers over a metal plate (number 19). So if I were to bet, I'm betting it's a normally closed switch, and "opens" the circuit for the air bag to keep it from activating. I'm guessing it may figure you have a child seat in there and you don't want the air bag at point-blank range? I dunno.
Interestingly, it's also on the driver's side too? Even with an electric driver seat. Is it required for 2010s? Is this why I have an air bag error? The driver's side harness is 92241760. I wonder if it needs to be retrofitted into the new harness?