hi everybody ,i hope someone can help ,we have a 99 td5 manual , my partner used it last weekend and the trailer lights would work ,then all of a sudden they came on ,,then on thursday nite the alarm went off ,i went to it and checked nobody had tampered with it ,they haddnt but it wouldnt lock ,it made the noise that a door was open ,a horn sound at rear ,went round car and shut all doors and still wouldnt lock,next day used car and the indicators would work ,but i took it to work to have a check of fuses etc and other things, and we found if you put the headlights on the indicators work and central locking also works,very strange does anybody think what might be wrong?