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that it's a wire not connected, maybe broken.
Again - this is info from my 1988 Volvo Wiring Diagrams book, the 1990 is likely the same, but check and be careful.
The unlocking relay is not being energized. To energize, it needs to have the green wire in that harness to be grounded. The knob switch and the key switch both ground that wire, but the wire is broken somewhere before it gets to the relay.
IMO the most likely place for the wire to break is where it is flexed with the opening and closing of the driver's door.
If I was searching for that connector, I would look first amongst the wires found above the driver's knee pad and along the edge near the fender. At some point the harness will go down behind the kick panel that surrounds the fuse panel and then go into that rubber flextube into the door.
Where along that route the connector is located is not something I know - but I would consider where it would be so that car assembly would be easiest. The diagram shows the connector not inside the door, and not inside the car, either.
If this test reveals the problem, the fix should be pretty easy.
Good Luck,
Bob
:>)
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