Rain & Brightness sensor - Citroen C4 2011 B7 1.6 e-HDi - EGS

[TeknaQQ]

Hello,

I have problem with the rain and brightness sensor on my car, work ok and suddenly fail.

Simptom:
*When I have the light on AUTO, stay on all the time, even if outside is sunny.

*When I have the AUTO wiper selected on, they run continuously even if outside is no rain/water on windshield.

I scan the car for DTC and I have stored: U1F39 - (Absence of Communication With The Rain and Brightness).

I verify the windshield sensor connection, clean the connector with contact cleaner, and no luck.

Is there another FUSE, Relay, connector that can I verify and clean?

How can I verify if the sensor connector wire is good and have current, ground working?

Thank you!