How do you reset the alarm system on the E 320 Mercedes Benz?

To reset the alarm system on a Mercedes-Benz E320, first ensure that the vehicle is unlocked. Then, insert the key into the ignition and turn it to the "On" position without starting the engine. Press the "Lock" button on the key fob to deactivate the alarm. Finally, turn the ignition off and remove the key to complete the reset.