My radio stoped working together with the start up switch, i have to turn on the radio manualy turn it off also. then ch changer stoped working completly and navigation doesnt work too. its turns on , u put the adress but its not moving anywhere, same when u driving it frose and no meter`what i do its not moving.`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````cd changer not working, radio works separete from the ignition and navigation doesnt work too

SOURCE: my ml320 cd changer stop

Service time for that head unit. Get it out and to a repair shop as the laser assembly needs work...accordianman

SOURCE: I have an ML320 2000, and the cd changer wont work.

Hi, The cd changer is at fault. You need to replace the cd changer. This ia very common on these vehicles.

SOURCE: radio audio muted and cd changer gives message no cd changer c320

Hi, Joe here to help. The cd changer is at fault. You need to replace the changer. The system is on a fiber optic loop which cuts out the sound if can not complete that loop.

SOURCE: 2003 E class elegance.radio wouldn't turn off now no display

the fuse and power supply box is located on the left side of the trunk behind the little panel. pull the 40 amp fuse for the sound system in that panel in the trunk. I believe its an orange fuse, 5-7 slots from the bottom. should be the only 40 amp fuse on the bottom half of that fuse panel. check the fuse chart behind the triangular panel on the left side of the dash. pull the fuse for 15 seconds and reboot the comand system. if the system doesnt reboot and operate normal, then 1 or more of the audio control modules is taking down the whole system through its fiber optic ring.

SOURCE: ML320 2003-FM radio not working except by turning the volume to maximum and it can only be heard faintly. The AM, cassette, Cd and phone work fine at normal volume. Any ideas??

for sure button for FM is out of order