Your sponsor might want you to be a psychopathic killer, but they still want some control. With an override, this control is easily achievable; they can remotely shut down all your cyberware at the flip of a switch. Sadly, so can anyone else with the proper access code.
The Override can be radio-controlled, trigger on some stimuli, or be linked to a BehaviorChip.
A more dangerous variant overrides your entire nervous system, causing you to fall into a helpless heap. Such an overide counts as two Limitations.