CITROEN DS4 Owner's Handbook Manual page 340

07 RADIO
DAB (Digital Audio Broadcasting)
Digital radio
Digital radio provides a higher quality reception and also the
graphical display of information for the radio station, by selecting
"Video mode" in "Radio favourites" (Options).
The different radio multiplex services offer a choice of stations
displayed in alphabetical order.
Press " RADIO ".
Select " Change band " and confi rm.
Selection " DAB " and confi rm.
Change of station in the same "multiplex".
Manual search for a "multiplex".
Digital radio - DAB/FM auto tracking
"DAB" does not have 100% coverage of the country.
When the digital signal is weak, "DAB / FM auto tracking" allows you
to continue listening to the same station, by automatically switching
to the corresponding analogue "FM" station (if one exists).
Press " RADIO ".
Select " Options " and confi rm.
Select " FM/DAB " and confi rm.
If "DAB / FM auto tracking" is on, there will be a difference of a few
seconds in the programme when the system changes to analogue
"FM" radio with sometimes a variation in volume.
Display of the "DAB" band then becomes "DAB (FM)".
When the strength of the digital signal is good again, the system
automatically switches back to "DAB".
If the "DAB" station you are listening to is not available on "FM"
(" DAB/FM " option greyed out), or if "DAB / FM auto tracking" is not
on, the sound will be cut when the digital signal is too weak.