The rain sensing wipers stopped working correctly in our Mercedes GLK after having the windshield replaced. When I turned the switch to either of the rain sensing settings the wipers would work properly at first while the vehicle was stopped but once I started moving they would start wiping at the maximum speed. I immediately thought it was a calibration or programming issue but I found that the rain sensor in my vehicle was not seated properly against the windshield. The rain sensor in my vehicle was only attached on the left side, I pressed firmly on the right side of the sensor, now the sensor is properly seated and the rain sensing wipers work properly again.
I filmed this video once I got home so the trim piece covering both the rain sensor and lane departure camera was already remove. It came off easily for me without any special tools by gently prying the lower edge towards the rear of the car and then pulling the cover down towards the dash.

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