I bought my c55 amg about a year ago with a Sony headunit already installed. Up until a month or 2 ago it has been working fine. Sometimes while driving the unit will lose all power. Sometimes it would start with the headunit having no power but would turn on sometime during the drive. It has had no power the past week but randomly turned on today only for it to turn off 2 drives later in the middle of the drive. When it lost the power there was a "display malfunction" warning on the dash...
C55 headunit issues
C55 headunit issues
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