After more digging around in the Volvo Wiring Diagram.
There's two possible culprits: 3/71 Tranny selector and 2/28 Alarm Module.
They both have computer controlled relay points in the starter circuit.

Where you have a delay, my bet is that the 2/28 Alarm relay module could be causing your problem. It is shown in the pictoral in the main Fuse block ,
lower level. It is marked "210 211". Get one from a junk yard to try.
Another view of the 2/28 Alarm Module and the starter interlock circuitry.

Bill
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