by the remote or by unlocking either door with the key
No
To enter a locked 1991 cadillac without a remote, simply use the key to unlock either front door lock. If all is working properly, the system will disarm. Arm /Disarm switches are integral with the front door lock cylinder and interior door lock switches. The system will automatically arm when using the inside electric door lock switch to lock all the doors.
GM uses a Pass-Key 2 anti-theft system during the 1990's which go out quite often. To disable the system turn the ignition key to the on position without starting the car. Wait 30 minutes and turn it off. Repeat these steps 2 more times. After doing this 3 times the system will be disabled and you can start your car.-or-Remove The Anti-Theft Fuse
In a 1991 Cadillac DeVille, the anti-theft fuse is typically located in the fuse panel under the dashboard on the driver's side. You may need to remove the cover to access it. Check the fuse diagram on the inside of the fuse panel cover to identify the specific fuse associated with the anti-theft system. If you're having trouble, consulting the owner's manual can provide additional guidance.
Disconnect your battery for a couple minutes to let the system reset. Should do the trick.
sounds like the factory anti theft system is armed. 2 ways to properly disarm---either with the factory remote pushing unlock or turning either front door outside lock with the proper key. If you dont have either, you must be the thief.
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