Put wipers onto intermittent / auto, spray water on the windscreen by the light/water sensor and if the wipers move, you have auto ones!
I think you can replace the auto relay with a regular one for about £50 from VW. I did that on my MK4 as the auto wiping was rubbish.
What that means is when you have the stalk position 1, the adjuster varies the wipe delay instead of the auto wipe sensitivity. Much better!