Originally Posted by
GraphiteGhost

You MIGHT be able to find a local member, and temp hook the new siren up to their car. This will eliminate or confirm the siren as the problem.
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I would think a simple hook up to the appropriate terminals would get a sound from it, a beep and a scream.
There are three terminals a ground, one for a beep and one for the siren signal. I am guessing but those are my thoughts on it. Maybe the ground is not adequate. Our favorite module is involved, the CLP/SSM.
As you are bhindzioncurtain I think you might be told any secrets pertaining to the alarm system.