Why do my Mondeo courtesy lights not work when doors open?

On my Mondeo [2l Ghia S reg] the interior front and rear courtesy roof lights do not illuminate when their switches are set to the 'door' position and any of the doors open.
However, the footwell lights do always come on, which indicates that the door swithces work. The courtesy lights do come on when the switches are set to the 'On' which indicates that the bulbs work.
The Haynes manual circuit diagram shows that the footwell lights and courtesy roof lights connect to the same point on the fusebox, which suggests that the fusebox is not the problem.
Any ideas what could be wrong?
Rick, January 2005


done
There's no after-market alarm fitted. I noticed the fault about 3 months ago. I guess I'll have to live with it. Thanks for your advice.

Rick, January 2005
Is there an after-market alarm fitted? If so, might this be feeding from the door to courtesy light wiring?

J, January 2005
maybe its a problem thats not worth worrying about it may cost a fortune in labour electrical problems sometimes can never be found i used to work for ford on service trust me it could be worse

si, January 2005
link Click here to see other fixes for Mondeo.