2005 Kia Sportage rear defroster is down

Most likely the connection between the heat source power wire and the glass grid. I went through this on my car, and what you describe is exactly the same--- button shows defrost is on and fuse and relay good and that turned out to be the problem, They wanted to install an entire new rear window, I declined..it can get expensive.

Thank you for the reply. I am not good at repairs but have good mechanical skills. Where do I look exactly to start? Kiaman