Had the windshield replaced last summer. First test on a cold day and the windshield heating element doesn't seem to work. Had full defrost in for 6 minutes and nothing but some defrost from blowing air. I also noticed that the back side windows weren't defrosting either. Does anyone know if they are connected to the same plug or inline somehow?

Would like to know this before calling the installer.

No idea about your screen, other than checking the wires are attached, the rear side windows aren't heated, they're aerials (antennas) not heating elements.