How to replace or repair rain sensor on a 2001 C320

  mercedes/c-class/2001-2007

I had my windshield replaced in my 2001 C320 and due to the age and mileage on my car i elected to have an aftermarket windshield installed with the needed rain and light sensors included. Now the rain sensor function in my wiper system doesn't work. Can this be repaired or replaced with out having to install another windshield?

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