Hi All My windscreen wipers have a mind of their own once switched on. Reading online there is no relay for the wipers and its controlled by the Central Control Unit For Convenience System. Ive looked on parts database websites and it flags up 2 part numbers. Any ideas witch one i need for my BEX A4 1.8T Quattro 2004 plate? as i already replaced the wiper stalk the other day and made no difference. and the motor seems fine as the wipers physically work but are just out of control i.e. we you click the stalk down once trying to get the wipers to go up and down once they go multiple times and its random. here are the part numbers i have narrowed it down to : 8E0959433BB 8E0959433BD Whats the difference?