Rain Sensor Not Working?
 

Hey everyone. I have a 2003 MB C32. Just bought it last month.

At the time I test drove it, it was raining. I put the wipers in the 1st mode and noticed that they were automatically adjusting speed depending on the rain condition.

After purchasing the car, I replaced the wiper blade and applied RainX repellent to the windshield. Now the sensor doesn't seem to be working. When I put the wiper in the 1st position, they just do the normal thing, a wipe every 5 seconds or so.

Any ideas?

maybe its the rainx repellant not letting the sensor sense correctly, hah to many s words together but id try that first.

So if the sensor can't sense correctly it automatically goes to intermittent mode?

im not an expert here but from my own observations, a few times when i started the car with a bunch of water on it and put it in the auto mode, it went real fast at first then revertted to every 5 or so like your talking about, and eventually it functioned as it normally should so its possible with the solution coating the windsheild it cant sense properly, im not sure how the rain sensor works cause ive never really looked into it but it would make sense if it couldnt feel the water on the sensor area.

i think mines stop working aswell. whe i put in position 1. it will continue wiping like if its in position 2. then i trying using the SDS to check the status of it and for some reason the SDS cant connect to it so .. i ordered a new sensor hopefully the new one works..

Is it possible to DIY install a new sensor? I thought it had to be like somehow sealed to the windshield.

its Glue With with some sort of double face tape type of glue i should be getting my replacement next week. i will try to take some pics..

so i installed the new rain sensor and still not working. i check the Fused and everything nothing! .. i used the DAS and its not communicating with it.. i guess i will have to take it to the mechanic :-(

Edit:
its not Glued in. it has two clips that hold it in place..

Did you find a solution?

The rain sensor is an easy DIY. It clips in as suggested.

One thing to keep in mind is the wipers do not function properly if the hood switch is not working. When the car thinks the hood is open it turns off the wipers. After you get the car up to speed the wipers work normally.