I have just replaced my Central Locking Control Unit on my 1996 Audi A6 part #4A0 862 257 J and it doesn't lock/unlock the doors.

A month ago the central locking system stopped working and the alarm would activate intermittantly unless I locked all the doors in sequence. Over the past few weeks the alarm has stopped coming on altogether. After I have reinstalled the control unit, is there a reset that I need to do or is the new control unit faulty? I have power on the central locking unit contact plug and all my fuses are intact.

Any help appreciated.