best thing to do would be to check continuity of the defrost panel. Many youtube videos on how to do this. It's no different then any defrost on any car. Suspect you have a break in the lines somewhere on the glass.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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