Hello,Such symptom occurs when the rain sensor fails, if you have it. I assume that pos. 2 and up are working ok.
Do not have rain sensor as far as I am aware
In this case, the sensor on the windscreen should be replaced or vehicle re-coded not to have the sensor
then wiper will work in time-interval mode.
Sorry, i typed in the answer before seeing your reply
Does the wiper work ok in 2nd position?
Yes and also with a single button push which will give a wash and three wipes
I suggest to have the vehicle codings checked. It can be that the coding got a glitch, and now expects the signal from rain sensor.
This can be done with Star Diagnosis computetr. Some independent MB shops have this tool besides the dealer
Mercedes garage were telling me that its the stalk and I need to get the airbags disconnected and steering taken out ---Quoted approx. 600 euro incl labour
Can you tell me the VIN of your car? I will check if it has the rain sensor and approx cost for the stalk.
What is VIN ???
17-digit vehicle identification number, it is in the vehicle registration papers