E-Class (W211) 2003-2009

rain/light sensor

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Old 10-16-2017, 06:07 AM
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Exclamation rain/light sensor

I have problem in my car w211 (E350 2007)

the problem is when I replaced the windshield the light and rain sensor stop working there are no message about rain/ light sensor malfunction appear screen but when I put the light switch auto in the daylight and night the headlamps working and the wiper at the first position working every 10 second. I need to know is the adhesive pad is is important because I did not put the adhesive pad
I replaced the light/rain sensor and replaced Its wires too and checked the fuse but Its not working yet
anyone have same problem? any idea what i should doing ?
thanks all
Old 10-16-2017, 10:26 AM
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w211 03'
If when installing the windshield they left deris inside the sensor then it is thinking it's night time cause it's blocking the daylight.
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Ahmed Thamer (10-16-2017)
Old 10-16-2017, 10:58 AM
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I took the sensor out and tried it in other position on windshield same problem
Old 10-16-2017, 11:09 AM
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Have you tried unplugging the sensor, then start the car to see how it reacts, also put your cellphone flashlight on the sensor and see if the lights turns off. If not I think you need a sentry to diagnose or a new sensor.
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Old 10-16-2017, 11:32 AM
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Take a look at the .pdf in this post. Might help.

https://mbworld.org/forums/new-m-cla...ml#post5773070
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Old 10-16-2017, 12:21 PM
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I did it too same problem headlight and wiper always working
Old 10-17-2017, 11:19 PM
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Originally Posted by Ahmed Thamer
I did it too same problem headlight and wiper always working
And you fix it or not?
Old 10-18-2017, 04:31 PM
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No .. not yet

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