Originally Posted by Tdancer2
FIXED!!!!
Here's the trick, in case anyone else runs into this issue.
Cycle the ignition on/off 3 times.
Leave it on the third time for at least 5 minutes - with the engine not running.
That will do it - why couldn't mercedes just say that the first three times?
:P
Thanks for the tip. I will give it a try. I about gave up on having a spare key which was fully functional. The dealer has been clueless on this. Thanks, and hope this works.