Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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If the signal light on the fob only operates on unlock and does not flash when lock is pressed and you have already replaced the battery in the fob itself this indicates the fob has an internal fault needing replaced.The fob flashes this light to let you know the battery is good and that a button was pressed on the fob.Since it does not flash when lock is pressed then the fob is faulty.This has to be ordered from a dealer.They will get it in over night in most all cases and it comes pre programmed ready to go on your model.A used one will not work even though some online places say they will.
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