Honda 2009 Civic Coupe Owner's Manual page 349

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Checking the Battery
If you need to connect the battery to
a charger, disconnect both cables to
prevent damaging your vehicle's
electrical system. Always disconnect
the negative ( ) cable first, and
−
reconnect it last.
The battery gives off explosive
hydrogen gas during normal
operation.
A spark or flame can cause the
battery to explode with enough
force to kill or seriously hurt you.
Wear protective clothing and a
face shield, or have a skilled
technician do the battery
maintenance.
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If your vehicle's battery is
disconnected or goes dead, the audio
system may disable itself. The next
time you turn on the radio, you will
see ''ENTER CODE'' in the
frequency display. Use the preset
buttons to enter the code (see page
221 ).
On vehicles with navigation system
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.
2009 Civic Coupe