Electric failure Right part Mercedes C270 W204

Hello everyone. I have a Mercedes C270 CDI of 2004. I am not leaving the right rearview mirror, nor the light of the right rearview mirror, nor the front and rear windows, nor the lower light of the right door and the motor of the right front seat does not go. Yes, the heat of this seat is going well.
All electrical failures are from the right side, the left part goes perfectly. What can it be?
Thanks and greetings.