If your Cavalier's anti-theft system is activated (e.g., the car won't start, lights flash, horn honks), the problem is likely one of the following:
* Faulty key fob or key: This is the most common cause. Try all your keys. If you only have one key, you'll need a replacement from a locksmith or dealership (they can program it). Battery in the key fob may be dead.
* Low battery: A weak car battery can sometimes trigger the anti-theft system. Jump-starting the car might resolve the issue.
* Body control module (BCM) issue: The BCM controls many aspects of the car, including the anti-theft system. A malfunctioning BCM can cause problems. This requires professional diagnosis and likely replacement.
* Security system fault: A fault within the anti-theft system itself might be the culprit. This again requires professional diagnosis with a scan tool capable of reading the car's diagnostic trouble codes (DTCs).
* Incorrect key programming: If you've recently had any work done on the car's electrical system or replaced keys, improper programming might be the issue.
What to do:
1. Try all your keys: Begin with the simplest solution. Make sure the key fob battery is working if it's a remote key.
2. Jump-start the car (if applicable): If the battery is weak, this might resolve the problem.
3. Check the car's manual: Your owner's manual might have troubleshooting tips specific to your Cavalier's anti-theft system.
4. Have it professionally diagnosed: If none of the above work, take your car to a qualified mechanic or dealership. They have the tools (scanners) to diagnose the problem and determine if it's a faulty key, a BCM problem, or another issue within the car's electrical system. They can also properly program keys if needed.
Do not attempt to bypass or disable the anti-theft system yourself. This is dangerous and could lead to further damage or even invalidate your insurance. Professional help is always the best option when dealing with automotive security systems.
