Acctim - I don't quite undertand what you want to do.
The reason SCN coding fails is because Mercedes can't generate a SCN code for a pre MY2009 car.
You have to code it with Star Diagnosis in "developer" mode - you can not turn on/off UCI from the "engineering mode" accessible on NTG2.5.
Also you need to have option 527 (navigation) added to the car's datacard and then SCN code the instrument cluster to enable the navigation menus. Don't be tempted to use option 511 as again Mercedes won't generate a usable SCN code.
Richard
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