How do u reset the security system on the 96 buick regal?

my dad just bought a 96 buick regal, the security light on the dash came on %26amp; now it wont start, is there a trick to getting it reset?How do u reset the security system on the 96 buick regal?try locking and unlocking the doors with the keyHow do u reset the security system on the 96 buick regal?You may be able to disconnect the battery for 15 minutes to reset the ECU, but if that doesn't work, then you will need to take it to a GM service center to get that reset.