Leon,
If you end up trying to replace the DIM itself, beware that they are "keyed" to the car with an internal code. So when you go shopping for a used one you need to give the seller the year of your car and give them the numbers that are printed on the back of the DIM. A good Volvo recycler will be hep to how to match the code numbers. If they simply want to send you whatever DIM they have on hand, the chances of it working are slim at best.
Also, don't turn the key on while there is no DIM in the car. That will set the SRS fault light which only the dealer or someone with Vida/dice can clear. Disconnecting the battery prior to removing the DIM, and not reconnecting it until another DIM is in place is probably safer yet.
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