Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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It is possible that this is an issue with the battery control module in the trunk as this can fail causing this issue here but it is also possible that there is a parasitic drain/draw on your battery due to one or more electronics failing/acting up in your model here.If you have not had a parasitic drain test done this needs done to see if this is the cause here for this fault as well as it will help in locating which electronic in your vehicle is draining down the battery needing replaced.
There are several components that can cause this and this is why this test is done to pinpoint which is the cause.I have seen the radio,stuck on relays,stuck on seat switches and lights cause this issue most commonly as well as internal seat control module failures and instrument cluster failures.If you want the procedure on how I do this let me know but it does require a multi meter to do this testing and the complete vehicle wiring diagrams to help locate the fault.
I would have the battery control module and the parasitic drain test done.
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