The Mégane II Owners' Club

Hi I am installing Powerfold mirrors and I want them to operate when I press the remote lock and unlock. I can get them to operate with Ignition button but I want them to operate as I walk to car, My question is where do I get a wire thats live after unlocking car and dies after car is locked,
Knowing how dodgy the wiring can be on the Megane I do not fancy messing with the Passenger UCH....any suggestions would help.

thanks
Steve