Help it doesn't work

Was given these instrutions to program a new keyless remote.
2002 grand prix remote keyless entry system programing

Remove the ignition key from the ignition lock cylinder.

Close all of the doors.

Remove the MALL PGM fuse from the fuse block.

Insert the ignition key into the ignition lock cylinder.

Turn the ignition to ACC. The body control module (BCM) will perform the following in order to identify the type of BCM installed in the vehicle:

Flash the seat belt indicator 1, 2, or 3 times.
Chime 1, 2, or 3 times.


Turn the ignition to OFF, and then back to ACC within 1 second. The BCM
may begin to chime and flash diagnostic trouble codes (DTCs). If the BCM has stored any DTCs, refer to Diagnostic System Check - Body Control System in Body Control System.

[when I get to this point alarm in car goes off and nothing else happens]

Open and then close any vehicle door. The BCM will chime in order to
confirm that the programming mode has been entered.


Press and hold the transmitter LOCK and UNLOCK buttons simultaneously
for approximately 14 seconds.

Important
After approximately 7 seconds the BCM will chime once to confirm that
synchronization has been completed. After approximately 14 seconds the
BCM will chime a second time to confirm that the programming has been
completed.


Repeat the previous step in order to program each additional
transmitter.
Remove the ignition key from the ignition lock cylinder.
Install the MALL PGM fuse into the fuse block.
Operate the functions of each transmitter in order to verify correct
system operation.

[Would appreciate verification if these instructions are right and the car alarm going off is normal?]
Thanks
MTH