How To Open Mercedes Key Fob 2015. We strongly recommend using a lithium battery like these ones, as they last much longer. You just need to learn how to switch on the ignition properly.
You also have a start button. Ensure you have new batteries in your key fob. To get the case open on all the key fob styles, you must remove the metal key altogether.
Jan 18, 2015 (6 years ago) i returned to the car yesterday and the remote key fob would not open the doors.
Repeat this once more, so that you have done it three times total. When you press the button on your key you should see a small red led light. After losing my last key, i went to mercedes and got a new one. Pull on the bottom tab of the key, away from the rest of the fob.