Just bought a 2004 fusion 3 and I'm loving it! My only issue is that the remote key fob unlocks all the doors fine and can unhatch the boot with no problems... but the lock functions sometimes doesn't work! When it doesn't - it makes half a noise and moves the rear wiper by 90 degrees - but the car doesn't actually lock.
Using the key in the door will work, obviously.
Tried looking in the manual but all the talk of double-locking just confused me. i'm not sure if I've activated something else (hence the not locking) or if I have a fault somewhere..