CITROEN C4 Owner's Handbook Manual page 304

04 AUDIO
Auxiliary socket (AUX)
Auxiliary Jack socket
The auxiliary Jack socket permits the connection of a portable non-
mass storage device or an Apple
USB port.
Do not connect a device to the USB port and to the auxiliary Jack
socket at the same time.
Connect the portable device to the auxiliary Jack socket using a
suitable cable (not supplied).
302
player if not recognised by the
®
Press the SOURCE or SRC button
several times in succession and
select " AUX ".
First adjust the volume on your portable device.
Then adjust the volume of the audio
system.
The display and management of controls is on the
portable device.