PA Ignition Sense

 Enables constant Public Address (PA) system ignition sense. Therefore, excluding External Radio mode (see also External Radio Ignition), the PA system is only operable when the vehicle’s ignition is turned ON. This feature applies on a radio wide basis.

 When disabled, the Public Address system is operable with the ignition switch ON or OFF.

When the Siren Operation field is not set to "Disabled", and

when the radio is model / option capable.