How do you reset the computer after changing the oil in a 2006 Cadillac DTS?

To reset the oil change light on a 2006 Cadillac DTS, turn the ignition to the "ON" position without starting the engine. Press the gas pedal three times within five seconds. After that, turn the ignition off and then start the engine; the oil life monitor should be reset. If the light remains on, repeat the process again.