When its trying to drain do you hear the drain pump humming, but not running?
Did you remove the drain hose from underneath your sink garbage disposal and put the drain hose in something to catch water in and see if it drains into that first?
If the drain pump is humming and not running, you will need to remove the drain pump and check for a foreign object that maybe stuck/jammed in it preventing it from running.
Here's the drain pump for your model:
This single speed dishwasher drain pump kit is designed for use with dishwashers. The single speed dishwasher drain pump kit is crucial because without it, the dishwasher cannot run properly. It drains water from the dishwasher and prevents leaking. A repair or replacement will be necessary if...
click.linksynergy.com
This video gives you the general idea of how to access it:
Make sure you disconnect power to your dishwasher first!
Jake