I have an 07 WRX Limited. Part of the Limited package is a wiper deicer, I think. Can anyone verify this, and does anyone know how the deicer works? I can't see any heating elements in the windshield, but there's a deicer switch on the dash with an indicator light that goes on and off.

I'm asking because I have to have the windshield replaced, and the shop wants to know if the windshield has a deicer built in. I can't tell.

Thanks.