I recently replaced the battery on my 1999 S70 since it was so dead the interior lights barely came on. When I put the new battery in the car it triggered the alarm. I had to turn it off by unlocking the drivers door. I'm guessing that even disconnecting the battery will not disable the alarm in your case. You will need to fix that lock or somehow turn the mechanism in the drivers door to disable the alarm and unlock the door. Either way you are going to need a new door actuator. Salvage yard or eeuroparts new ($125+).
2000 XC70 108K miles (transmission swap, heater core, timing belt)
1999 S70 156k
2003 S40 181k
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