Rear Clean in Renault 19 TD

The rear windshield only works for me the first time I give it and only once, then it does not work again. I have cleaned the control in case it had Carbonilla, the connections are fine. What can be? Any change? Don are the relays and what is it?

The relays have them in the fusera amisma or in the front near the engine normally this relay has it on the portfusible port, then it can also be that the engine the engine contacts can be worn out the upper cover and see if the platinos or the contact channels are spent, or if you can get another engine and tests it would also be good you can also try if there is a continuous current flow in the connector.

In the fuse box are the relays, but which of them is that of the rear clean?

You must have a sticker that tells you which one is or activates the cleaner and hey where the noise of the activation of relays comes from, or test if it reaches current back, to the engine connector.-

bridge the cleansing, quitalo and board 30 with a cable and if it is working continuously without failure, the failure is neither in the engine nor in any cable from the relief to the clean. It starts around there for the moment