CITROËN Grand C4 Picasso Owner's Handbook Manual page 306

QUESTION
The stored stations do
not function (no sound,
87.5 Mhz is displayed...).
The quality of reception
of the radio station
listened to gradually
deteriorates or the stored
stations do not function
(no sound, 87.5 Mhz is
displayed...).
Sound cut-outs of 1 to
2 seconds in radio mode.
With the engine off,
the audio equipment
switches off after a few
minutes of use.
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An incorrect waveband is selected.
The vehicle is too far from the transmitter used by the station listened
to or there is no transmitter in the geographical area through which the
vehicle is travelling.
The environment (hills, buildings, tunnels, basement car parks...) block
reception, including in RDS mode.
The aerial is absent or has been damaged (for example when going
through a car wash or into an underground car park).
During this brief sound cut-out, the RDS searches for any frequency
permitting better reception of the station.
When the engine is switched off, the audio equipment operating time
depends on the battery charge.
The switch-off is normal: the audio equipment switches to economy mode
and switches off to prevent discharging of the vehicle's battery.
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ANSWER SOLUTION
Press the BAND AST button to return to the
waveband (AM, FM1, FM2, FMAST) on which the
stations are stored.
Activate the RDS function to enable the system
to check whether there is a more powerful
transmitter in the geographical area.
This phenomenon is normal and does not indicate
a failure of the audio equipment.
Have the aerial checked by a CITROËN dealer.
Deactivate the RDS function if the phenomenon is
too frequent and always on the same route.
Start the vehicle's engine to increase the battery
charge.