SEAT Alhambra II 2.0 TDI Diesel 177 PS Bj 2014 Splash pump does not work

Hi dear forum members. after having had good experience with my old Megane in the forum, I have to ask something again today. My Seat Alhambra no longer pumps splashing water. My car buddy said we were changing the pump. We did that, brought it nothing. I had still typed on the steering pole but I can’t check that. I only know that it switches the windscreen wiper when I pull the lever. I checked fuses. All i.O someone no ch an ideas how I can check what ? Is there still a control unit or how is it regulated by the car ? lg