That switch assembly is fine, unfortunately it's the power that feeds that which is low voltage.

It depends how badly you want your seats to work. They aren't gonna get fixed with a keyboard, monitor and mouse. You need to start at one end or the other and trace. Sorry.

Usually someone has already experienced the same problem, and not everyone has time to trace wires all day.

It's not that long of a trace for crying out loud. Fusebox to driver's seat. A driver's side kick panel, a piece of trim. Not to be a smarta$$, but that could have been done in less time than has been spent on your posts.