Theft System in Cavalier 2.2. Year 97

Good friends from the forum
I need help to reprogram the ignition system of a cavalier year 97 engine 2.2l synchronous
The case is that after an electrical repair they handed me the car and worked perfectly for 2 weeks but after turning it off at night, when trying to turn it on, it fails to start the engine despite turning perfectly. The gasoline pump does not work and the light of Theft System on fixed. This light must be turned off after several seconds that the key is placed in Run but does not turn off.
They told me that due to some blow, the anti-theft system had been activated and should reprogram the key with a combined method of key and start but has not worked.
The key has no chip or transpose and the sensor is on the ignition cylinder.
When the light of Theft Systema titled it did not turn on but when applying the reprogramming method, it is now fixed and I do not know how to reprogram.
Thanks for your contributions