but anyway from your posts from vcds as well your equipment list telling that you don't got it at all. Only way (as far as I know) to check it is getting down the console and checking if it is there physically, if is connected, if answers are for both questions are yes, that mean somebody (if you aren't first owner) knew this fault and disabled heater, so no codes will be thrown by vcds, otherwise could be faulty unit, not connected, cut, unplugged cables, fcked up fuses for unit or control module, control module. Obviously I'm not professional but is the way I would do in your case.