Its above heated rear window button and has a similar illustration but clearly represents the front window
http://www.lexus.co.uk/car-models/ct/ct-200h/?gclid=CLrJ5_j1pssCFSPnwgodkv0A4g&gclsrc=aw.ds#VehicleFeatures
What exactly does the heated windscreen button do on a new ct200h advance? It lights up when pushed for a couple on minutes before going off but seems to have no affect