Hi I have a 2000 W reg Ford Fiesta 1.3 Finesse and the back window heater doesn't work and hasn't done in a long while. The button still lights up when pressed, and it used to work occasionally but has now stopped completely. The rear wiper is behaving in the same way, and may occasionally work if I'm lucky. I was going to replace the fuse, is there anything else I should be looking at? Thanks!