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I'm confused, did the OP say his siren 'screamed' when he worked the battery cables? If so, I do not think the siren PCB is damaged. Good to unplug to check though. Another thing, the siren will scream if plugged in and working when the POS cable is removed first. Any time you remove the battery (or a cable or two), remove the NEG first. This will insure the serviceable siren will not cause you to impact the hood. Finally, the car takes a time to 'sleep' the electronics. I do not know if any doors/hatch are still keeping the car awake from sleep, so I would open the windows and close the doors/hatch. That leaves the hood but I do not think that keeps any modules awake if the hood is open. Good luck!


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