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Afternoon All,

Have recently found out due to the cold weather that the rear windscreen demister is not working at all. When i press the demist button the light comes on(along with the usual clicking noise) and the two heated mirrors demist fine however the rear windscreen fails to clear at all.

I've checked for breaks/damage to the lines with no visible damage. I've checked Fuse 12 under the bonnet which looks fine. Does anyone know if there a fuse in the internal fuse box under the dash for the rear demister?

57 Plate Civic 1.8 ES Petrol

Thank you
 

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Also check fuse 36 in the under dash fusebox, but if your heated mirrors are working then that rules out most of the circuit.

Check the output from the heated screen relay in the under bonnet fuse box or supply to the HRW itself.
 
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