I bought new 300s in May it's 2012 nothing but unfortunate events happen since to the car too with including a cracked windshield. I replaced it and paid extra for rain sensor windshield but it does not work the same way it did before. Now if on intermittent when i start up the car the always come on and before it didn't unless moisture on shield. Also if windshield was in off position and a rain drop hit it they turn on now it seems they don't work properly at all I took it in but they say it works fine but they also don't understand what I'm saying bout previous functioning.
Take it to the dealership and tell tthem u want the sensor reset if that doesnt fix the problem then its due to either an inferior glass and sensor in the windshield or the sensors in the glass are to sensative and u may have to get a new windshield again but that could de pricey so ur first step is to get the sensor control module reset bcs that should have been done when the glass was replaced
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