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Question:

What does the security light mean on dashboard?

When I started the car after work, I looked at the dash and the security light came on. Before that, in the morning, I had the car on on but not running. The car kept auto-locking itself and wouldn‘t stop until I turned the car on. I looked up the answer, but they were all different. Some say I need a checkup while others say someone might have tried to brake into my car. I didn‘t notice anything different from my car and nothing was missing. Also, I have an ‘05 Grand AM.The car still starts fine but I want to know if there is a problem so I can fix it before it gets worse. Thanks

Answer:

Dashboard Lights Meanings
The security light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well. vatspasslockpasskeysecurityhelp.y.
What Does Security Mean

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