If your 1989 Cadillac Brougham won't start and you suspect the security system, here's what you should try:
* Check the Battery: A weak battery can often trigger security system issues. Make sure the battery is fully charged or replace it if necessary. A jump start might temporarily resolve the issue.
* Key Fob (If Equipped): Some 1989 Broughams might have had optional key fobs, though it wasn't standard. If you have one, try using it to unlock and disarm the system before attempting to start the car. If the fob's battery is dead, that could be your problem.
* VATS (Vehicle Anti-Theft System): The most likely culprit is the Vehicle Anti-Theft System (VATS). This system uses a resistor in the ignition key to authorize the vehicle. If the resistor is faulty or damaged within the key, the car won't start. The solution is usually to replace the ignition key (and potentially have it cut by a locksmith or dealer). Sometimes a bad connection in the ignition switch itself can mimic a VATS problem.
* Ignition Switch: A faulty ignition switch itself could prevent the car from starting and trigger a security system response. Replacing the ignition switch may resolve the issue.
* Professional Help: If none of the above works, take your car to a mechanic specializing in older Cadillacs. They will have the tools and expertise to diagnose the exact issue with your security system or ignition system. They can properly test for faults with the VATS system.
In short: there's no reset button. The problem likely lies with the key, the ignition switch, or the battery. Focusing on these components is the most effective approach.
