MB logo appears on COMAND for 5 seconds and disappears
This behaviour means that something on the fibre optic network (of audio devices, called MOST bus) has failed.
As you have a W211 with COMAND, it has atleast the following
COMAND
AGW (amplifier/tuner) (in the boot between inner and outer wings on left
NAV processor (in boot)
CDC (below COMAND)
And possibly
Phone
Linguatronic (VCS)
Harmon Kardon version of the AGW
Finding out what has failed really requires a visit to the MB dealer or a specialist with Star Diagnosis AND the knowledge to diagnose MOST bus fault.
- Those without the specialist knowledge (including MB dealers) often do a 'change that item and see if it fixes it' - fine under warranty, but expensive and unnecessary otherwise - it is highly unlikely more than one unit has failed. Unless is the AGW or the COMAND the dealer should be able to bypass the failed unit before changing it and prove the system works (obviously you'll lose the functionality of that unit)
You can PM (private message) alfie on here, he is in Surrey, UK and will be able to do the diagnosis for you properly if you're anywhere near.
Richard
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