How can I fix my Vauxhall Astra Estate Rear Window Heater?

check for a duff fuse ,
you have 12v power supply (to) the switch ,
you have 12v from switch to the heater relay,
you have 12v from relay to the rear element,
the rear element wire has continuity.(note broken)

The wires maybe broke between the tailgate and the car body due to the opening and closing action of the tailgate

wirecutterman
November 2009