CITROEN DS4 Owner's Handbook Manual page 346

08 MUSIC MEDIA PLAYERS
USING THE AUXILIARY INPUT (AUX)
JACK/RCA AUDIO CABLE NOT SUPPLIED
Connect the portable device (MP3, WMA player...) to the RCA audio
sockets (white and red) using a JACK-RCA audio cable.
Press MUSIC to display the " MUSIC "
menu.
Select " Activate / Deactivate AUX
input " and confi rm.
First adjust the volume of your portable
device (to a high level). Then adjust the
volume of your audio system.
Display and management of the controls are via the portable device.