Gen 2 rear defrost - advice please

[MtopRaptor]

Hey everyone
So this morning I noticed the slider and driver side no longer work. Looking for some troubleshooting advice. What are the likely issues, would it be on a separate fuse, bad relay contact?

Looking for some easy steps before I start removing the seats, etc, thank you in advance

 

[HighwaySentinel]

If two thirds of the rear window is not defrosting, it is unlikely the fuse. As far as I know, there is only one fuse for the whole rear window.

My 2018 slider stopped defrosting. Ford changed out the whole rear window. It would have been expensive if it would have been out of warranty.

 

[Spike Spiegel]

My 2018 is the same, but opposite. My slider and driver side work, passenger side does not.

 

[MtopRaptor]

Thanks for the input, I was down hard with the flu. Does anyone know of site where I can get the electrical diagram