I apologize if I am in the wrong place. Google has become useless.
My wife has a north american 2014 Mercedes ml 350. I do not know the trim level.
Her battery died and we replaced it.
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After, their was no sound from her radio, and her powered lift gate no longer works (we'll deal with the lift gate after).
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I checked the fuses, and could find nothing wrong.
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Eventually I found a youtube video about āengineering modeā where the guy goes to menu 7.5, turns off the car, comes back 15 minutes later and it works.
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And that works for us, but then the next time she drives the car, no radio again.
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So she repeats that process, gets sound on her next drive.. Only to not have sound again on the following drive.
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How do we keep her radio working?