I have tryd the wd40 on both front cental locking motor conections which were damp water leaking in then the remote central locking will work once i have messed around with it but leave the car for 20-30 mins then it will stop working it isnt a signal problem unlocks fine but i also found that the car will remote lock with the passenger door open so dose that mean the passenger door motor is at fault which is causeing the system to think the doors ajar so trying to lock then unlocking Thanks Alex