If you have a locking switch on the dash, try disconnecting that. If not, try the disconnecting the switch on the door.

This has worked for another BB member with the same problem.

An old Volvo tech once told me that Volvo switches can be the weak link in some circuits.

To pull the switch, try gently prying it out from the side. One side of the switch has a clip that will break if you pry it out, the other side is meant to pry out gently. If one side won't cooperate, try the other side.

I do not know which side to pry, so try both sides, or ask the board to help you with this specific question. I have removed several switches over the years, some time ago.

Interestingly, many Volvo procedures start with a small screwdriver and prying - the secret is knowing where to pry first.

I did a search, and if you have a noise in the dash, the problem could be a relay.