someone her said the Owner's manual is on the Volvo web site, and sure enough it is.
Someone else put me on to alldata.com. Service manual with detail, you subscribe every year, looks real good.
Sure is a lot of help here!

Since my light switch overhead won't move, I know there is something wrong. How does a working switch work, do you just slide it sideways to the position you want, or so you turn it first ssomehow. It appears to be missing a knob or something, I see a center post sticking doen, an two small holes on either side of the post. If I knew how it works, I could force it where I want it, the current position is all lights off in interior.