323001817 - N066 MEDIA PLAYER AUDIO CANNOT BE HEARD

With the media player activated, whilst the information appears on the display, no sound can be heard in the vehicle.
1RADIO VOLUME CHECKAll OKProblems encounteredOperation
Check that the radio volume is not set to 0.If it is, set it to a higher volume (e.g. 35) and check that the problem disappears.Check that the USB port is working properly by carrying out the    See Test 5570TQ MEDIA PLAYER OPERATION CHECKEnd of diagnosis.The volume is already set to a high enough level.Move on to Step 2
2ELECTRICAL CIRCUIT CHECKAll OKProblems encounteredOperation
Check the continuity and the insulation of the electrical circuit between the radio and the speakers    See E3510 RADIO Also check that the radio connectors are not faulty.End of diagnosis.1. Electrical connections faulty.2. Front tweeters faulty.3. Front speakers faulty.4. Rear speakers faulty.5. Faults in the radio connectors.1. Restore the correct connections.2. Replace the tweeters    Op. 5570T92 FRONT TWEETER (ONE), LEFT OR RIGHT - R.R 3. Replace the speakers    Op. 5570T90 FRONT SPEAKER (ONE), LEFT OR RIGHT - R.R 4. Replace the speakers    Op. 5570T96 REAR SIDE SPEAKER (ONE), LEFT OR RIGHT- R.R 5. Replace the radio    Op. 5570T80 CAR RADIO EQUIPMENT - R+R