E46Fanatics - View Single Post - DIY - Rain Sensor Reattachment Fix
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Old 04-11-2009, 09:57 PM   #7
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Join Date: Mar 2008
Location: St Louis
Posts: 41
My Ride: 03 330i zhp, 01 330i
Great write-up! Thanks for showing me what's in there, trying to retrofit auto-sensing wipers into a non-premium car. Just fyi, the sensor works by refraction--when the windshield is dry, emitted light (not sure what freq) transmits through the glass, then "bounces" off the outer glass layer when it hits the glass/air boundary, back to the 4 sensors. When there's water on the windshield, the angle of refraction is much less, so most light transmits through the boundary into the water droplets, and doesn't go to the sensors, so it's wipey-time. Anyway, great fix! I wouldn't have guess silicone would have worked, but it obviously did!
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