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Hi, the problem is typically caused by a bad alarm siren. When the siren malfunctions it causes the alarm to activate. If the problem only occurs when you lock the car I would suspect a faulty siren. Another possibility is a faulty central locking vacuum pump. The pump is what triggers the alarm so either the siren is bad and is causing the problem or the pump is bad. The siren will usually not sound when it is faulty. The only way to keep this from happening is to remove the siren or leave the car unlocked.
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