[Hocrest]

There's also a "front wiper control module" under the dash, up above the main relay and fuel pump relay.

If you get a new stalk switch, the wiring harnesses attach down under the dash. I'd plug it in to test if that's the problem before going through the hassle of pulling the steering wheel to swap switch assemblies.

edit; just saw who posted... the location of the wiper module I gave is on LHD cars. Not sure if everything swap side?? I would guess so??