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The alarm system will work fine with an aftermarket system in it, providing the installer finds the single wire requiring grounding.
Otherwise, the horn chirps when the car alarm is activated, much like when one leaves open the center console, glove box (for those of you lucky enough to have one of those wonderful things) or the front or back trunks are open.
My installer didn't know this, and wouldn't know which wire to ground anyway even if i told him... but I really like the horn chirp because I usually can't tell if the doors locked in the loud city in which I live and park. The chirp is a audio reminder that I have indeed locked the car. But it's not "standard" to leave it that way.
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