Acura 2000 TL Owner's Manual page 225

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Battery
If your car's battery is disconnected
or goes dead, the audio system will
disable itself. The next time you turn
on the radio you will see "Code" in
the frequency display. Use the
Preset buttons to enter the five-digit
code (see page 142 ).
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 Owner's Manual.
Maintenance
NOTICE
Charging the battery with the cables
connected can seriously damage your
car's electronic controls. Detach the
battery cables before connecting the
battery to a charger.