OK, I see what you have now.
This is a Whirlpool DW labeled for Maytag.
The first thing you need to do is find the end of the drain line and see if it terminates at a siphon gap dome located on the top of the sink. If you have such a device, remove the cap and then pull the inner cover off and see if it is clogged up for debris. It looks like this
Next if the siphon gap is clean you need to get under the sink and disconnect the hose attached to the pipe and then get a bucket and see if the water drains normally into the bucket. If the water is drains slowly into the bucket, the next step is to remove the bottom panel on the dishwasher and remove the hose attached to the pump check valve on the right side of the motor. It looks like this
You will get water coming out of the hose if there is water in the dishwasher, so soak or vacuum out as much water as possible before you remove the hose.
Once you get it the hose off, unscrew the pictured device and look for a clog.
If you do all these things, and it still will not pump out, then the drain hose most likely has something in it and you will have to pull the dishwasher and remove the hose and run a sewer cleaner rod down the tube.
Hopefully you will find the problem.
If not come back and tell me what you found.