Because the problem is intermittant i am having difficulty determining if it is the fuse box/multi function unit at fault or something else.
When the car starts communicating again all that comes up in most control units is voltage or communication faults.
At the moment looking at some wiring diagrams, i am assuming that there are 4 relays that power the multi function unit. I will see if changing about with those relays the car starts working again...
Message Thread Mercedes Benz C200 CDi W204 2009 - Fault with multifunction unit - Fixed # - Job Gevers November 9, 2016, 12:17 pm
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