The cause of the security light being on needs to be diagnosed and fixed, not just reset. Possible causes include:
* Weak or dead battery: This is the most common reason. Try jump-starting the car. If the light goes out and the car starts, you likely need a new battery.
* Faulty Passlock system: The Passlock system is a common anti-theft system in GM vehicles of that era. A malfunctioning Passlock sensor or module can trigger the security light. This usually requires professional diagnosis and repair, often involving replacing a part.
* Problem with the ignition switch: A failing ignition switch can sometimes interfere with the Passlock system.
* Aftermarket alarm system issues: If you have an aftermarket alarm system installed, it could be interfering with the factory security system.
* Key issues: Problems with your car key or transponder chip can cause this. Try all of your keys if you have more than one.
What NOT to do: There are many online suggestions for "resetting" the security light using various key turning sequences. These are generally unreliable and may even damage your car's electrical system.
What you SHOULD do:
1. Check the battery: Make sure the battery is fully charged.
2. Try all keys: If you have multiple keys, try each one.
3. Consult a repair manual: A repair manual specific to your 2001 Oldsmobile Alero will provide more detailed troubleshooting information.
4. Take it to a mechanic: The most reliable solution is to have a qualified mechanic diagnose the problem. They have the tools and expertise to determine the root cause and fix it properly. Attempting to fix the Passlock system yourself can be complex and potentially expensive if something goes wrong. A mechanic is equipped to handle this appropriately.
Don't waste time trying unproven "reset" methods. Get a professional diagnosis to ensure the underlying problem is addressed.
