So after trying to look this up, I saw that everyone had the opposite issue. The wipers only working in the highest setting and not intermittent.

I however have the issue where the intermittent setting and the next one up work, but the highest setting does not. Normally this isn't a big deal, but last night I was driving in a torrential downpour and it made seeing a bit difficult without that setting.
Any ideas what could cause this? The only thing I could think of is a connection in the wiper switch itself, because anything else should cause the rest of the functions to fail as well.

Any help would be appreciated!

 

I'd start by checking for power at the wiper motor when in high. That'll point you to either the motor, or something within the wiring and switch.