Not sure how or why, but my rear defroster seems its necessary to turn off and on when my wipers move up and down. It also happens with my turn signal. I disconnected the switch, and could still hear the relay clicking, so I've unplugged the relay. No serious issues, since weather has been mild, but living in Iowa, you like to have functioning heat and defrosters.

Haven't really looked much into the issue, was just wondering if anyone else has had this issue, or knows the ghost that would cause it!

 

Check and clean the grounds on the car honda's do some weird **** if they have bad grounds

 

you got a short in your wiring if it goes on and off with other things in the vehicle, just trace the defroster wires and you will find the issue.