Do you mean what is the difference?
Should have a few switches under the mirror controls.
All i can remember is Defroster in the Front Windscreen, Mirror Desfrosters and maybe heated seats if they are leather.
I have also heard there could be a button in the cup holder bin.
^^ hmm due to heat given proximity to down pipes etc?
Apologies for the thread mine, but is related to a current line of research.