MERCEDES VITO W447 INSTRUMENT CLUSTER POSTAL REPAIR SERVICE. Mercedes Vito W447 Instrument Cluster Repair Service. Following a battery replacement or low battery condition, the FRM3 module may lose its programming data, leading to failures with indicators, windows, headlights and other functions. Malfunctioning or blank LCD display. A 447 900 40 07 (A4479004007), A 447 900 40 06 (A4479004006), A 447 900 92 05 (A4479009205), A447 900 86 06 (A4479008606), A447 900 86 04 (A4479008604), A447 900 96 05 (A4479009605).