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

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2 answers 1 comment
TRY ANOTHER KEY IF AVAILIBLE TO START WITH.COULD BE IGNITION SWITCH ASSM HAS GONE BAD
Thanks. I will get that checked.
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.