Command, where is it?
 

Hi guys.

I'm working on merc w 212 from 2012. Radio is on but nothing on display. i check all fuses and feed for both. all ok. Faults communication with command. Radio was replaced for second hand and still the same. Where's command?

Thank you.

it is necessary to check the monitor

I checked feed and earth. all ok. Do you know where's command module, because volume adjustment from st.wheel is not working too. Fault is communication with command?