CITROËN C4 Owner's Manual page 247

USING THE AUXILIARY INPUT (AUX)
JACK SOCKET OR RCA SOCKET (according to vehicle)
The auxiliary input, JACK and RCA, permits the connection of
portable equipment (MP3 player...).
Do not connect a single piece of equipment via the USB socket and
the JACK socket at the same time.
1 1
Connect the portable equipment (MP3
player...) to the JACK socket or to
the audio sockets (white and red,
RCA type) using a suitable cable (not
supplied).
2 2
Press the SOURCE button several
times in succession and select AUX.
ADJUSTING THE VOLUME OF THE AUXILIARY SOURCE
1 1
First adjust the volume of your portable equipment.
2 2
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The controls are displayed and managed via the
portable equipment.
Then adjust the volume of your audio
equipment.
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