The alarm should splice into the door lock/unlock signals.
The same wires should control both sides and front/back. So if the door lock drivers side is not opening passenger side and neither is the alarm I would suspect the subaru door solenoid on the passenger side.
The alarm may have 2 door locking modules. One for front pair and one for back pair that way less hardware is required for a 2 door.
Sometimes some wd40 and some manual locking/unlocking free's up the muck in the mechanism which then gives the solenoid an easier time and may start working again.
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