See also:

ON
This is the normal operating position after the engine is started. ...

For U.S.A.
The following information has been compiled according to Code of Federal Regulations “Title 49, Part 575”. ...

Type A audio set (if equipped)
Type A audio set (if equipped) The audio set will operate only when the ignition switch is in the “Acc” or “ON” position. - Power and audio controls: refer to page - Radio operation: refer t ...