how to reset security system on 2001 deville,installed used steering collum

Drivers side door lock I believe.

Turn the ignition switch to "Off." Pull down on the top of the fuse panel lid beneath the steering column. Remove the fuse panel lid. Grasp the fuse that is labeled "ECM" or "ECU." The inside of the fuse panel lid shows a chart indicating where each fuse is located. Pull the fuse straight out of the fuse panel. Turn the ignition switch to "ON" without starting the engine. Leave there for five minutes. Turn the ignition switch off. Replace the fuse into its slot in the fuse panel. Press in on the fuse until it is fully inserted. Replace the fuse box cover.

if u didnt put ur old ignition in the new collum ul have to reprogram for the pass key that model key may be on the dash not sure but if its on the collum this will apply

cant find it the emc or ecu mine isnt labled that

I need to turn the alarm off

When I press my key the alarm activates but I don't think it works what could this be

Uncut I cut my stereo wires to replace a new stereo but when I did

Cadillac does not have "EMC"or "ECU.specially a 2001 Cadillac DeVille so your comment did not help me,I am still lost as ever.Kelvin Cain.

Its called PCU on Cadillacs