Are the head lights suppose to come on when the auto wipers are on?

Just today I noticed that the wipers where on but the heads light did not come on, even when it was raining quite heavy. The head lights came on for 30 minutes whilst it was still raining and then suddenly switched off again for 10 minutes and came back on again.

Do I have a faulty auto head light sensor?

The reason I am asking is because on my x Audi A6 the Head lights used to come on as soon as the auto wipers where on.

Thanks for the help.