Ford Fiesta 95. Problem with the electrivaduras

Good afternoon
the reason for this post is because yesterday the window of my car, exactly the driver stopped working and right now I have it down.

I have no experience as a mechanic but this morning I have ready to fix it. I have come to demonat the internal part of the door leaving the metal part engaged with the cables and buttons to climb the windows.

I don't know if the problem is electric or mechanical. I have been told that to verify it, I should exchange the driver's cable (brown) with that of the co -pilot and thus could rule out any of the two things.

Do you know about the steps to follow?

I await your help.
Thank you very much

pd. Remember that I am a rookie in this and that I do not know the most basic. For example ... it occurs to me that I would have to disconnect the battery but maybe it is not necessary ..
a greeting

The theme is sensillo directly verifies in the engine its operation by drawing panel and connecting positive and negative in the motor input tab I recommend you peel with a coter both if it does not work you invest the cables if it works and upload your problem is in the electrical part of the line or cables but almost always burns the alsacristal key which is obtained easy in the market if on the other hand the engine will not work the engine. Repair never looks good I hope it serves you

Solved.
It turns out to be a problem of the button that fails to climb up. I don't think that can be fixed so I will see where to buy one.
Thank you very much for all
a greeting