aloha, this is my first time in this forum. However Im in need of all expertise that can really help me with my 2004 mercedes c240.

3 weeks ago my main power switch control for all my window started to fail on me. at first the first 2 button for the front left and the passenger window was working and now all button not working including my driver side mirror. I was told that it was the DCM is my problem. So I got me a second hand from EBAY for 60 bucks. So I removed the battery and installed it but nothing happen still the same. I checked all the fuses and its all good. Im on the end of my rope on what to do before I will have no choice but take it to the dealer which will cost me and arm and a leg.Please need your help if anyone may have this problem before and had it solve. thank you and mahalo.