Mercedes Front left Malfunction or U100887 LIN BUS 1 is faulty - solved

In this video I am showing process how I dealt with error stating FRONT LEFT MAULFUNCTION CONSULT WORKSHOP or showing on diagnostic as LIN BUS 1 is Faulty. In this scenario it was just ground cable that was loose/disconnected at some point. However I am showing electrical schematic for front passenger weight module with colour coding and also where the cables lead to. First step is always check if the fuse is OK. Then check if the connector is not loose. Check for connector or cable damage as when the seat moves up & down this is quite common fault. Check for 12V+ voltage on the connector and proper ground Check LIN BUS 1 wire for continuity Leave the weight module replacement as last option to save £££