Does it make grinding noise when it is trying to drain?
How much water? is it above the silver filter?
Where does it drain to? Disposall or stand pipe or air gap
I don't know if the pump is the issue if it an electrical or wiring issue. You will have to do a live voltage check at the pump when it should be on.
To change the pump:
Disconnect power and remove the toe plate. The silver bar above the opening above the white base remove the silver bar. The white hose that goes in front of the pump pull it out from the right side. Flip the plug cover and disconnect the wires. Find the locking tab on the base of the pump. Push the release and twist the pump and replace. When you put the pump and the hose back in plase, put a little film of rinse aid to lube the o-rings.
If you want service on the unit call bosch first.(NNN) NNN-NNNNYou may also ask them if your unit is under the dishwasher recall. If you give me the serial # XXXXX can check for you tomorrow.