Here's a breakdown of the likely scenarios and how to approach them:
* Key Issues: The most common cause of anti-theft problems in older Cadillacs is a problem with the ignition system or the keys themselves.
* Try all your keys: Make sure you're using the correct key(s). If you only have one, this step is irrelevant. If you have multiple keys that came with the car try each one.
* Check the key's condition: Is the key worn or damaged? A damaged key may not properly engage the ignition switch or the anti-theft system's transponder chip (if equipped). Consider having a new key made by a locksmith familiar with older Cadillacs. This is often a better route than replacing the ignition switch, especially if the keys are in question.
* Ignition Switch: A worn or faulty ignition switch can prevent the car from starting even with the correct key. This is a common point of failure in older vehicles. A mechanic can diagnose and replace it.
* Security System Malfunction: The anti-theft system itself might have a fault. This usually manifests as no-start conditions, intermittent starting problems, or unusual electrical behavior.
* Battery Disconnect: Disconnect the negative (-) battery terminal for 30 minutes. This *sometimes* helps clear out minor glitches in the car's computer system. Reconnect the battery afterward and try to start the car. Caution: This will erase any radio presets.
* Professional Diagnosis: This is the crucial step. A mechanic with experience in older Cadillacs, or one with access to a diagnostic tool that can communicate with the car's onboard computer system, is essential. They can identify the specific problem within the anti-theft system or related circuits. Trying to troubleshoot this yourself without the proper tools and expertise can lead to further damage or complications.
Important Note: Avoid attempting to bypass or disable the anti-theft system yourself. This is dangerous and could damage the car's electrical system or even void any existing insurance coverage.
In summary, don't look for a reset button. Focus on addressing potential problems with your keys, ignition system, and then seek professional help for a proper diagnosis of the anti-theft system itself. A qualified mechanic will be your best resource for resolving this issue.
