Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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In some cases this can cause a voltage surge damaging one of the SAM control unit/ecu's as I have seen before in the past with it needing replaced.It tends to be a voltage surge or spike that can cause this here when connecting a battery in some cases unfortunately.If you have not checked to make sure all fuses are good in all fuse panels this needs done first.If all fuses in all panels are found to be o.k. then I would have the fault codes checked/read out with a fully compatible scan tool to see what codes are set in all computers.Once this is done any codes set will need diagnosed to help locate and repair this issue here.If a SAM control unit does need replaced it will need programmed to operate properly.
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