Mercedes-Benz S-Class 2012 - Manual (Page 289)

The windshield wipers are inoperative
The windshield wiper drive is malfunctioning.
X Select another wiper speed on the
combination switch.
X Have the windshield wipers checked at a
qualified specialist workshop.
The spray nozzles are misaligned
The windshield washer fluid from the spray
nozzles no longer hits the center of the
windshield. The spray nozzles are misaligned.
X Have the spray nozzles adjusted at a
qualified specialist workshop.
Windshield wipers
287
Lights and windshield wipers
Z