walterkaiser94

SLC rain light sensor issue

Has anyone seen this before My 2017 Mercedes SLC with a gasoline engine is throwing a rain-light sensor fault Got 257916 km on the clock The error's stored in the memory auto wipers aren't working in the rain headlights aren't automatically switching and even the speedo dimming isn't functioning The lights are just always on Suspecting it's those bubbles under the gel pad on the windshield messing with rain detection but not 100%

4 comment(s)

That sounds awfully familiar. I have an SLC too, though I can't recall the exact build year at the moment. I experienced something similar a while back. My rain sensor went haywire, and it messed with the light sensor as well. The automatic headlight control was the first thing I noticed. Does your car have issues with sensor calibration? I remember reading that sometimes the angle needs adjusting after a windshield replacement, or even just with age and general car electronics weirdness. Have you checked for any obvious damage to the sensor itself?

Cheers for the quick reply Sensor calibration not something I've messed with Where exactly is the rain sensor located And how would I check it for damage

Okay, so the rain sensor is usually integrated with the light sensor, right behind the rearview mirror, attached to the windshield. As for checking for damage, well, that's tricky. In my case, the dealer pointed out the problem right away. The bubbles were visible under the gel pad on the windshield. He advised me to go to the workshop.

Thanks Turns out you were spot on Bubbles under the gel pad were indeed the culprit Cost me 62€ to get sorted Appreciate the help

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