Quote:
Originally Posted by Overboost
I would guess you have a replacement windshield that is not as good with the OEM reflective IR sensor. You can just unplug the rain sensor or pull fuse 41 and it will default to 7 second sweep intervals. But this may disable your auto lights if you use them. You might also try to recalibrate the sensor to the glass but in a pinch, just disable it. 
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My windshield says BMW on it, and its pitted enough that I had assumed it was original. In fact, we were just talking about replacing it just to get fresh glass. I hadn't even thought that I might need to buy one from BMW.