You could test the siren by rolling the driver's window down, locking the doors, and reaching through the open window to unlock the door. Just make sure you have the key handy to start the engine and turn the alarm off if there is any noise.
Usually, when the siren module dies, the siren will not sound. Most often it is the battery pack that begins to leak all over the circuit board.
As for the UEM, if you have the skills, you could probably find the fault by checking the circuit board and repairing the circuits. Buying a used one is problematic, as you would need to update the software and the Chinese code reader will not allow you to get software from Sweden.
XeMODex.com will transfer software from your UEM to a 'good condition' used UEM, for $700+...
A Volvo deal will charge you around $1200 for a brand new one!
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Keeping it running is better than buying new
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