Mercedes W212 | How To Change Seat Switch

How to change seat switch for Mercedes-Benz E-Class W212 2009 - 2016 models. This is kinda easy procedure but be carful if you have multicontour seat so you not brake any lines when remove the seat cushion.
Also there is a airbag close to the seat switch so take it easy when working at this area.
This procedure is mostly the same for all models such as E220 E250 E350