My Haynes manual does not address this at all, so I'm posting here in hopes of help. My central locking works fine from the trunk as well as the driver's side door. However, it does not from the passenger side (it worked for me from that door for a short period of time, maybe 3 months, after not working the whole previous two years that I had owned the car - then it quit again). I'm sure someone out there will know exactly where to look. Thanks in advance.