yeah thats the one. as for the light on the switch, i have put non heated screens into cars when they should of been heated into the first shape mondeos and also on focus' andthat wouldnt bring on the light on the button as the circuit wasnt complete. its probably the same on other ford models so it would suggest the elements are fubar. one possible way to check would be disconnecting the screen and bridging the harness and see if the switch lights up