The rear defroster on my friend's Mitsu is not fucntioning. The fan works, as well as the a/c, the fuse is good, and the relay is also fine. Yet still he is getting nothing out of the rear defroster. Any insight(s) would be greatly appreciated. Thank you, and I hope everyone has a most splendid evening

 

Check to see if you have power to the rear def grid.If thats ok get a test light and follow the grid from side to side, it should be bright at on side and slowly dim. Also see if the grid is broken anywhere on the rear glass, thats most likely your problem.