Anti theft system disabled start on car.

The problem id say is the key . Remove the antenna ring from the ignition and put your old key inside the ring and try to start it if it starts then you you have a choice , change the barrel to your old barrel so the old key works, try to code the new key to vehicle or to secure old key in ring and secure it somewhere .

These PATS - anti-theft systems can not be disabled , nothing you can do . Your best bet , take it to a qualified repair shop.

Anti-theft system isn't allowing it too .
The Passlock™ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock™ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock™ System are as follows:
• The ignition lock cylinder and key
• The ignition lock cylinder case, including the Passlock™ sensor
• The ignition switch
• The body control module (BCM)
• The security indicator on the instrument cluster
• The powertrain control module (PCM)

What year vehicle ? You have a starting problem ? no - crank - no start or cranks - an no start ? Anti-theft light on ? Replacing the steering column isn't going to do anything . Depending on the year an make there is a anti-theft module or transceiver behind where your stick your key in . Does your key have the transponder or as some call it (pellet ) in the head of key ? Some anti-theft systems disable fuel injectors an still others disable the starter .

Did you put the original anti-theft module on the new steering column ? Does yours have steering column mounted ignition switch ? Vehicles with steering column mounted ignition switches have the exciter integral with the theft deterrent control module (VTD) which is located within the steering column.

According to RepairPal: "the car wont start due to anti-theft system, it will say wait three minutes then start, but repeat this process 4-5 times - Visitor"

They say there are 75 reports of: "Problems with the anti-theft systems using the raised-chip key can prevent the car from starting. The wires in the steering column to the ignition lock cylinder tend to break. The the key and ignition lock cylinder must be replaced to correct this condition."

Passive Anti-Theft System (PATS) Transceiver module is around the key lock cylinder behind or under the plastic cover on the upper steering column'
Passive Anti-Theft System (PATS) Transceiver Removal

1. CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.
   Disconnect the battery ground cable, Refer to Section 414-01

1. Remove the ignition switch lock cylinder.
   1. Insert the ignition key into the ignition switch lock cylinder and turn to the RUN position.
   1. Push the ignition switch lock cylinder release tab with a punch while pulling out the ignition switch lock cylinder.
   2. If equipped, remove the tilt wheel handle.
   3. Remove the upper and lower steering column shrouds.
      1. Remove the screws.
      1. Remove the upper and lower steering column shroud.
      2. Remove the lower instrument panel steering column cover.
         1. Remove the screws.
         1. Remove the lower instrument panel steering column cover.
         2. Remove the instrument panel steering column opening cover reinforcement.
            1. Remove the bolts.
            1. Remove the instrument panel steering column opening cover reinforcement.
            2. Remove the anti-theft transceiver module.
               1. Remove the screw from the bottom of the transceiver module.
               1. NOTE: Only apply pressure or leverage below the key cylinder lower rib.
                  Disconnect the electrical connector and remove the module.

If code 53 involves the PASS system for your car, the chip in the key has failed, or the sensor in the lock cylinder, or the control module.
The anti-theft system disables the starter and the fuel injectors. You could bypass those circuits to get the car started.

Take out the screws holding the upper and lower plastic column covers together. Pull the lower cover off. Now look at the ignition switch mounting bolts, they are anti theft. If you go to "Tools n More" or "Harbor Freight Tools" you should be able to purchase the special anti-theft tip you need in a set to take the screws out. Once you have unbolted the switch putting in the new one is easy.

the wire that goes to the ignition to the anti theft device is probably broken if you call a good locksmith they can go in through the steering column and fix it same thing happened to my 95 eldorado apparently cadillac designed the anti theft system to coincide with the ignition and is connected to the ignition with two wires that turn as the key is turned the wires twist and eventually they wear out