Body/Trim: 850: Courtesy Lights not working when doors unlocked

[stevepcar]

I have a problem with the courtesy lights on my 1995 850 estate. The front courtesy lights work when operated manually from the overhead switch & the rear ones work from their individual switches. The footwell lights come on when I open the front doors. But the courtesy lights do not come on when I open any of the doors. I have looked at the article by Christ the Ancient, but I think its about a later car, so the pictures of the lock do not match mine. I can see only one switch which does nothing if I operate it, also it looks nothing like the ones in his pictures. Has any body fixed this problem, or do I need to get new locks?