Sony MEX-N4000BT Mode D'emploi page 26

APP SOUND (application sound)
 Button operation cannot be performed while a
sound menu on iPhone/Android phone is open.
 Exit the sound menu on iPhone/Android
phone.
OPEN APP (open application)
 The "App Remote" application is not running.
 Launch the iPhone's application.
If these solutions do not help improve the situation,
consult your nearest Sony dealer.
If you take the unit to be repaired because of CD
playback trouble, bring the disc that was used at
the time the problem began.
26
GB