Skoda octavia vrs 55 plate ?

i have a skoda octavia vrs on a 55 plate the o/s/f central locking will not work, the o/s/f wing mirror oswitch will not work but n/s/f is working i have a voltage to both of these and have tryed to replace the central locking door lock and the wing mirror swich and still no joy any ideas appriciated ??