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I had the same alarm going off with door open widely last year. I've never used the alarm and never intend to. For my '86 930, the alarm module was in the front trunk under the ventilation unit. Removed the ventilation unit and measured the resistance of the 2 wires from the alarm door key. It was 4.7k ohms. Sometimes...
As I opened and closed the door, the resistance would change from 4.7k ohms to zero then to infinity. The wires were breaking sometimes shorting and other times completely open.
To fix this, I cut the 2 wires from the door and soldered in a 1/4 watt 4.7k ohm resistor. Problem solved.
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