Honda 2007 Civic Hatchback Owner's Manual page 226

Your audio system has another
interrupt function (including TA
function). The first activated
interrupt function has priority over
the others and the indication of the
other interrupt function goes out. To
activate the other interrupt function,
turn off the current interrupt
function.
Audio System (on vehicles without navigation system)
PTY Alarm
PTY code ''ALARM'' is used for
emergency announcements, such as
natural disasters. When this code is
received, ''ALARM'' comes on the
display and the volume is changed.
When the alarm is cancelled, the
system will return to the normal
operation mode.
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Features