Electric mirrors problem
 

Hi, just bought a 2011 1.6tdci titanium for my son to do up, a bit tatty but well equipped, but I can't get the electric mirrors to adjust - the switch appears to do nothing. I have checked all fuses and they seem good, but when I look at the switch unit it only has about four wires in for a dozen components. I assume everything is computerised. Can anyone give me any advice on how to diagnose this? Is it possible I might need to get this enabled via the computer?