* Accidental Trigger: If the alarm is triggered accidentally (e.g., someone bumped the car, a door wasn't fully closed), you'll likely need to unlock the car using the key fob or the key in the driver's side door. Once the car is unlocked, the alarm should stop. If it continues, try locking and unlocking again. Sometimes a faulty door switch can cause this.
* Key Fob Battery: A weak or dead battery in your key fob can sometimes prevent it from properly disarming the system. Try replacing the battery in your key fob.
* System Malfunction: If the alarm is going off for no apparent reason, or the above steps don't work, there's likely a problem with the alarm system itself. This could be a faulty sensor, a short circuit, or a problem with the car's electrical system. In this case, you'll likely need to consult a mechanic or an automotive locksmith. They can diagnose and fix the underlying issue.
* Aftermarket Alarm System: If the Cavalier has an aftermarket alarm system installed in addition to the factory system, the reset procedure will depend entirely on the specific brand and model of the aftermarket alarm. Look for documentation or contact the installer.
In short: Start with the simplest solutions (check the car doors, key fob battery). If the alarm persists, professional help is needed.
