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The rear screen heat seems to work only when the engine is running - well on mine it does
Check if voltage is getting to the heater and if not do a trace from it electrical connections to the multi-connector. I am assuming you either have a multimeter or test lamp.
A quick check to see if the element is warming is to breathe on it real close - any condensation will start to clear.
Currently in madnoel10's garage:
Honda Civic 1.4l