S 550 (221.171) V8-5.5L (273.961) (2007)
The audio tuner control unit has its own fault memory. All faults that have occurred during operation are stored there in a non volatile memory.
In the event of a request via STAR DIAGNOSIS, all diagnostic data are forwarded via the MOST to the COMAND controller unit (A40/3) which serves
as the interface to the central CAN.
The requested diagnostic data are then forwarded to the central gateway control unit (N93) via the central CAN where they can be read out at the data
link connector (X11/4).