I just replaced my regulator and I noticed the same thing. I also notice this when I disconnect the battery to work on the car.
I reset mine by taking it all the way down and then taking it all the way up and then hold the button for 2 seconds, it works for me.
Hope this helps
1993 400SEL (W140) 281K
1999 S500 (W140) 163K (Sold)
2002 S500 (W220) 72K
1999 S500 (W140) 88K
You cannot simultaneously prevent and prepare for war.
Albert Einstein (1879 - 1955)