As I read thru the thread, and particularly the last few posts - Im beginning to think that we are about to discover a mistake in the service manual.
There IS one thing tho, the BCM is in charge here, it is triggered by the output of the Multifunction switch, but it takes it from there.

I do not know how sophisticated or complicated the wiper function of the BCM is, but as I read thru this, I am starting to think the BCM is flaky.