What is yours doing? Mine will occasionally get strait up and down the freeze. Then randomly take off and start working. I am lazy so I have been just not using mine..
If it's like mine (intermittent) the short was in the boot between the hatch and body. I ended up using soldered, heat shrink butt splices to fix and it works fine ever since.
PS, check all the wires...the CHMSL and rear defroster may be next.