After fitting great heated leather seats............bought the two looms from BMW.......switch from Ebay........Fitted loom...fitted switch......nothing....not a sausage......The only thing different is old switch only had ASC written on it...........new unit has DSC written on it and two heated seat buttons...

Nothing works...DSC does not illuminate on dash when pressed and seat buttons when pressed do not light up / heat my ar*se

Any ideas please?