Acura 2007 RDX Owner's Manual page 383

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If your vehicle's battery is
disconnected or goes dead, the audio
system will disable itself. The next
time you turn on the radio you will
see '' '' in the frequency
display. Use the preset bars or preset
buttons (depending on models) to
enter the five-digit code (see page
239 ).
On RDX with Technology Package
model
The navigation system will also
disable itself. The next time you turn
on the ignition switch, the system
will require you to enter a PIN
before it can be used. Refer to the
navigation system manual.
Checking the Battery
379