How to bypass GM VATS on 2004 Buick Century. How to program new key without the antitheft.

If your vats is causing the car to not start, replacing the ignition cylinder as I did isn’t necessary. It took researching my problem to understand I only needed to bypass the vats to fix the problem and turn off the security light.  Just putting resistors on the connector will bypass the vats fixing the problem.
 
If you don’t want to cut the wire to your ignition to put resistors on it, you can go to a junk yard and cut one off a car there or order a cheap ignition cylinder from amazon or rockauto.com  Cut that wire and use it without cutting the wire to the already installed ignition cylinder.

I used a multimeter to measure the resistance of the resistor of the key. It measure 6 ohms.  I used 3, 2k ohm resistors.  I soldered them to the wire the wire from my old ignition cylinder. I used heat shrink to cover the wires.  

To program a new key without the resistor, put in the key and turn it on. Leave it on for 10 minutes.  Turn the key off for 10 seconds.  Repeat this 3 times.  A total of 30 minutes and 30 seconds.  After the 3rd time, turn the key and it should start. My car did.  

The top cover on the steering column has a security bolt that looks like a torx bit. A 4mm socket will remove it. The bottom cover has 2 torx screws.  

BOJACK 1000 Pcs 25 Values Resistor Kit 1 Ohm-1M Ohm with 5% 1/4W Carbon Film Resistors Assortment
https://www.amazon.com/dp/B08FD1XVL6?...

Radio in my car Pioneer AVH-221EX

https://www.rockauto.com/en/catalog/b...

https://www.amazon.com/s?k=buick+cent...

These 2 youtubers videos helped me in replacing my ignition lock cylinder and programing the new key to work.

HOW TO PROGRAM A GM/CHEVY CODED/ANTI THEFT KEY FOR FREE!
HOW TO PROGRAM A GM/CHEVY CODED/ANTI ...

1998-2003 Buick Regal Ignition switch and key cylinder removal
1998-2003 Buick Regal Ignition switch...

Music in video
El Elixir (piano)
By: Miguel Angel Albentosa Bó (MaaBo)/Jamendo
Source: Adobe Stock
Asset ID#: 511567222