The problem is diagnosing *why* the anti-theft system is engaged. Here are the most common causes and how to potentially address them:
* Incorrect Key: This is the most frequent cause. Try all your keys. If you only have one key, you might need a new one cut and programmed. A locksmith or dealership will be able to help.
* Weak Battery: A low battery can sometimes trigger anti-theft measures. Try jump-starting your car. If it starts, you likely need a new battery.
* Faulty Passlock System (GM's anti-theft system): The Passlock system in your Grand Am uses a resistor in the ignition key to communicate with the car's computer. If this resistor is faulty, or the communication is disrupted, the car won't start. This often requires professional diagnosis and repair or replacement of the ignition system components.
* Security System Issues (Aftermarket Alarm): If you have an aftermarket alarm system installed, it might be the culprit. Consult the alarm's manual for troubleshooting steps.
* Immobilizer Problems: The immobilizer is part of the anti-theft system and prevents the engine from starting if it doesn't recognize the key. This usually requires professional diagnosis and repair.
What NOT to do: Avoid attempting to bypass or disable the anti-theft system yourself unless you are highly experienced with automotive electronics. Incorrectly tampering with the system can cause further damage.
Recommendation:
The best course of action is to take your 1996 Pontiac Grand Am to a qualified mechanic or a dealership. They have the diagnostic tools to identify the exact problem with your anti-theft system and perform the necessary repairs. Trying to fix it yourself could be frustrating and potentially expensive if you damage something further.
