unlock button on key fob not working after reconecting car battery


Registered User
hi all, was carrying out some welding to my 2004 2.0tdi BKD A3 at the weekend so i disconected the battery for a couple of hours. now ive put it back on everything works, bar the unlock button on my key fob. ive tried reprograming the key using the manual instructions but that hasnt worked. both the boot pop button and the lock button work fine
has anyone get any ideas? cheers jonny