Thanks very much for diagrams I have contacted black box, who assure me that the nanocom can enable the heated screen in the BCU

I've got climate/air con fitted, Tested everything and not getting the switched earth to the relay, so was assuming it was an easy fix! Not so sure now though!

Morning, Have a D2 with heated screen fitted but not working. Been through fault finding and convinced it's not a factory fit, so needs turning on Anyone local to hertford with a nanocom, ? Obviously willing to pay. Thanks Gary