XSARA PICASSO Rear Clean does not work

Hello everyone. I hope someone can guide me a little.
I have a Citroen Xsara Picasso that does not work the rear windshield. When I give me a relief (through the area of ​​the fuses) that is activated but does not move. Can you have burned the engine without further ado? Is there any way to check? I don't think it has a specific fuse for the rear clean, right?
And already put, if I had to change it, is any special tool necessary?

Thanks in advance

greetings

You can check it, activating the rear clean control, and disconnecting the plug that enters the clean engine you can check if current arrives with the help of a test lamp or a polyimetter. If current arrives, the engine is burned, if not, it may have a molten fuse. If it is not a fuse or problems in the circuit.

Hello,
I have disassembled the lid where the clean engine goes and there is something that does not fit me.
Three cables arrive at the connector: thick green, finer and gross yellow.
Between green and purple 12v.
Between green and yellow 0v.
Between purple and yellow 12v.
I active the clean (I hear in the fuse box the rel) and there nothing happens, I explain, I understand that I would have to have some kind of passage in the contacts, when it was played by the movement, and I always have the same tension in the same terminals.
The most curious thing is that this test is done without the connector on, since, with the connector on I have no 12V tension where I had it loose (it is crazy). Loose 12v, connected 0V.
I don't know if you will see the photos I am trying to send

greetings and thanks