Hi Gary,

I may be missing a point here. Is the driver side dome light switch working and the passenger switch not? Or is it the other way around? I'd have to assume you are trying to make the courtesy light come on when your passenger opens the door. That's because the circuit arrives at the drivers door switch before being tapped to run to the passenger side.

Looks like that black wire runs across the dash, behind the glove box, and as I recall is a wire with very thick black insulation for what it does. If open, I would suspect someone has molested it in some past repair job, like a blower motor perhaps. Do I understand the quest correctly?

Edit: My '85 version of the WDM shows a slightly different wiring pattern using a blue/black wire to reach from passenger side and tap into the driver side wiring. Do you know whether you have the delay option?
--
Art Benstein near Baltimore

What engineers say and what they mean by it:
"Not well defined."
Nobody has thought about it.

Seems you have the schematic but here is a page steal off K-jet.org

[URL=http://s772.photobucket.com/user/tporterellijaycom/media/volvointeriorlightschematic-001.jpg.html][IMG]http://i772.photobucket.com/albums/yy4/tporterellijaycom/volvointeriorlightschematic-001.jpg[/IMG][/URL]

On my car there are two wires leaving the switch. One goes to the key-in-the-ignition circuit and the other to the headliner light. Ground provided by the switch operates both.

[edit] Never figured out how to post pictures on this forum

CB your response to me actually answers the OP's question. Hope he sees it. :)

I have that same book and also the 81 edition. It is (they are) nearly 1/2" thick printed in black and red and includes the foldout overall diagrams with part identification references Bentley published, but readable. Someone had a lot of patience scanning what they did of that book.
--
Art Benstein near Baltimore

Behind every successful man is his woman. Behind the fall of a successful man is usually another woman.