Try one of these two methods, depending on the model(mine is an SHV model and I removed the beep with the second procedure).

METHOD 1
* Open door, push and hold Delicate/Econo button, then turn the dishwasher on while holding Delicate/Econo button.
* Release Delicate/Econo button.
* If module beeps, then end of cycle tone is on. Press Delicate/Econo button to disable tone.
* If module doesn't beep after button is pressed, then tone is disabled.
* Turn off dishwasher to save selection.


METHOD 2
If you wish to eliminate or reduce the volume of the end of cycle beep you can do so by powering off the unit and turning back on while holding the right button “Cancel/Reset” (i.e. the right button of the Cancel/Reset combination). The beep has 3 volumes levels and silent, press the right “Cancel/Reset” button to cycle through the settings. Power the unit back off to save your setting.