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Re: car won't acknowledge key in ignition
As you know the battery in your key not only operates the courtesy controls, it also sends a signal to a sensor in the vehicle that allows the key to be used. Either the chip in the key is faulty or the onboard system is not recognizing the key. Call the dealer(sorry, hate giving that advice) and tell them the same. Have them start with the key first, so to keep the cost down a little. You could check through the technical book for a relay or fuse associated with the security system of the vehicle. You can get this online as a PDF file.
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on a lot of these late model computer base cars when battery power get low the computer gets confused. try this disconnect the neg. battery cable. charge the battery. reconnect and try again. my son cobalt battery went bad key was stuck in the igntion. good luck.
Merecedes keys have to "relearn" the car once the batteries either fail/die, or have the batteries removed. The only thing to do is take it to a garage and have them relearn the key for you. It doesn't take too long and shouldn'tcost more then an hours labor.