Hi there, I have a toyota hiace 01, and after I bought it I started to get central locking problems gradually until it just stopped working, I then had a replacement installed which has worked great until yesterday when it was making a quieter locking sound and not locking now all of a sudden it's stopped , unfortunately they key on all doors but the passenger does not work from the outside as u can imagine this is annoying, does any1 have any idea as to what it could be.I've been told that the solonoid's could be knackered but then phoned an auto electrician who said they won't know till they look at an expense of 150. Any help would be appreciated.