how can i fix keyfob mercedes c180?

my keyfob went dead i changed the batteries and pointed it at mirror and then in ignition for 30 secs and still doesnt work why is this
karen, July 2008


done
i changed my batterys in my keyfob but still getting red and green light on so car wont start

kevin, September 2008
link Click here to see other fixes for Mercedes C180.