Due to the VATS (Vehicle Anti-Theft System) - you cannot deactivate the anti-theft system on the Cadillac. There is however, a by-pass that can be made for this. It is not recommended due to the insurance liability if the car is stolen.
The keys for this system are not that expensive. If your ignition stops working because it can't read the resistance on the key chips, you can purchase from a locksmith or dealer - and sometimes an automotive store- a replacement ignition. It must have the wires for the VATS.
If you want to by-pass the VATS, you will have to know the resistance of the current key. Then go ta a electronics store or have an electrician make a resistor or device which equals that resistance. Find the yellow leads at the base of the steering column for the VATs, cut the wire and install the resistor across the wires.
Be aware, if a mistake is made it can be very costly to repair the situation - usually cheaper by a locksmith than a dealer or auto shop.
Always remember to disconnect the battery cable prior to working on electronics.
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.
You can disconnect the battery for ten minutes and it will reset
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