you got the wrong key.
Majority of the time the problem is in the ignition key chip or ignition lock cylinder
The wires on the lock cylinder are broken-needs new lock cylinder./
To disarm the factor alarm on a Cadillac Sedan Deville, place the key in the ignition and turn it slightly without starting the car. Leave it in that position for 10 minutes and turn the car on.
You can reset the theft system in your 1994 Cadillac Deville by putting the key into the ignition. Turn the ignition to the auxiliary position, without starting the engine. Leave it in this position for 30 seconds.
Ignition Key switch is bad.
Won't the valet key open the trunk
1. it's the wrong key 2. your Ex busted something in the cylinder such as part of the wrong key 3. one of the tumbler's is bent out solution call a locksmith
willnot open trunk or locked compartments
cant its the computer
By turning the ignition key
To reset the alarm system on a 1996 Cadillac DeVille, first ensure the vehicle is unlocked using the key or remote. Then, insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Unlock" button on the driver's side door while simultaneously pressing the "Lock" button three times. This should disable the alarm system and reset it.
Press the trunk button on the dash board or the remote key fob