/Sorry for my english..im from hungary

My car 1999 S2 HDi RHY, I bought a new MFD with Trip Computer i want to install to my car.
Before i wrote here i search older topics ..bit i cant find what im looking for.
So the problem: In my washer switch i dont have the button to change information on the display. I want to use a new push button to do this. When i remove the cables from it i see the two pin..but there isn't any cables for me. I post pictures down.
So the first question the two missing cables: Where are they from (maybe from ecu and bsi) ? Any number? And how?