when i flip the switch only like three lines heat up and work. the top two and one in the middle. How do i get the rest to work? Du i have to get a whole new hatch?
Rear defrost not working... WHY??? - 6G Celicas Forums
are there any breaks in the lines that do not work?? if so you have to scratch the area right by the break, and use something like liquid silver(conductive pen) to retrace the lines, then some kind of epoxy/resin to seal it. or you can get a new hatch window 
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