Theft deterent system in 1999 Cadillac deville not working properly

You need a capable scan tool to check DTC'S - diagnostic trouble code's .
DTC B2734
DTC B2960
DTC B3031
DTC B3055
DTC P1630
DTC P1631

These would tell why the PCM - engine computer isn't starting the vehicle . There is no by-pass for this anti-theft system . The Dealer is your only hope . Nothing you can do !
The theft deterrent control module produces the theft deterrent fuel and starter enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel and starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM detects an incorrect password, vehicle theft deterrent (VTD) system failure or attempted vehicle theft, DTC P1631 is set. The engine will not start or crank as long as the condition is present.

It is located in the steering column (the ignition key receiver is part of it). The obvious question is why you need to locate it - unfortunately, the theft deterrent system is dependent on a number of different modules and sensors, and just replacing or disconnecting it will probably disable your car without fixing whatever problem you are having. Back to a dealer ...

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You need to connect and OBDII code reader to the car. The anti theft system communicates with the car's computer. Turn the ignition key to accessories, and allow the code reader to read for Diagnostic Trouble Codes (DTC's). Any DTC's connected with your theft deterrent system will show up. Reset the codes to remove the theft message from your car. This cannot be done without an OBDII scanner.

Unhook battery, let sit for 5 mins and hook back up.

follow these directions.

go to the web link

http://vats.likeabigdog.com/

The theft deterent module is bad then

u need the owners manual. it tells how to change the theft deterrent system.

the theft deterrent system is acting up a dealer is the only way to service it.

If your security light is on it may be your key that's preventing the car from starting. It's programmed with a code to prevent theft (Pass II theft deterrant system or something like that). So either the key is screwed up or the module that reads it is screwed up - either way it will disable your ignition.