Hi Ya...my Ford focus also does this,but only in below ambient tempretures i.e when its freezing outside.I'm sure i read somewhere that its either water ingress into the electrical connectors or the door locks themselves at fault.
Sorry i cant be more precise....Gary
Gary
July 2006
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix car alarm systems.