Q. Can I take out on Shabbat from the dishwasher dishes that were already washed if no light goes on or off?

A. 1) A dishwasher is Muktza because it is considered a “Keli Shemelachto Leisur” since the normal use is prohibited on Shabbos. (Shulchan Aruch O.H. 308: 3). As such one is allowed to move it or parts of it for a permitted activity needed on Shabbos. Chashukei Chemed (Pesachim 109a) in regards to a child who hid the afikoman inside the washing machine, permits taking it out as long as no light or other electrical connection is done. (See also Luach Hamuktza p. 44)
Horav Shlomo Miller’s Shlit’a opinion is similar and permits taking out dishes and utensils from the dishwasher on Shabbos when needed

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a