I have a 940se 1991 and it has the same problem. Its the relay. It is located behind the pass kick panel on left side if sitting in car. Its a big black relay and has an a and e printed on the outside. Its very expensive to replace new 100 to 150 dollars. I am working on a rewire with a standard light relay. Hope that helps and good luck.
The lights relay is located below the radio, you can get to the relay by removing the ash tray. the relay is red and round and is on the same panel as the fuses. Good luck
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