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Why will my key not work? I've changed the battery,but it wont open the doors. on 2001 Mercedes-Benz S430

Changed the battery in the key but still wont open anything. Any help would be greatly appreciated

Asked by for the 2001 Mercedes-Benz S430
TRY ANOTHER KEY IF AVAILIBLE TO START WITH.COULD BE IGNITION SWITCH ASSM HAS GONE BAD
Thanks. I will get that checked.
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1 more answer
You'll need to sync the key with your system. In short it needs programing. We can do that here with our Mercedes scan tool, same as the Mercedes dealer.