Thank Tony- The photo you sent is really helpful (is it in the archives?)
Turns out, the backup light switch is OK.
As you and others reminded me, I finally got around to checking the PC board. I had looked at it only briefly before. That particular pin has been damaged very badly sometime in the past, and I guess I hadn't thought much about it since it somehow actually worked for the last 7 or so years I've owned this car.
So, for the next little while I will be working on a repair for the PC board. I luckily already had an extra connector that I could rob a pin from. Hopefully this will fix the problem.
Thanks to everyone once again for all your help!
http://www.strucktower.com/volvo_damaged_connector.jpg
Keith
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