Safety for the wiper water pump

Hello everyone! I have a problem with the wiper water pump from our Berlingo (Bj 11/2002). Since it was very cold for us the last time I think the water pump was frozen (we already had the last winter). But when the temperatures normalized again, the pump still did not go . Now my next idea was the securing for the pump. The manual (12/2001) was not much help to me. The fuses make a , in the visual control, good impression. I am grateful for every help, as the TÜV is standing in front of the door. MFG Adi