Vauxhall Zafira heated rear window and inside switch

Hi Using a test light, earth one side and put the probe side onto the heated rear window wire the probe should light if theres pwr at the window,Alternativley the glass should feel hot to the touch,If your not getting this check that the wiring attachments are connected at the rear screen,If no pwr, check the fuse,If the fuse is okay go to the switch, remove it,check that pwr is getting to the switch and is transfered when the switch is pressed.If none of these options help then possible broken wire which could be located through continuety test with a mulimeter,I will talk you hrough this if req, Hope this helps.