Any ides? I have tried everything I know. 1994 S500 , Battery is good. Tried both keys. Push in and turn left, turn left and push in...... Worked once then hasn't worked in 2 days. Its undergoing a safety check and they need to get into trunk. Can I get into the trunk thru rear seat? Easy? Hard? I am lost. Mercedes dealer said hes never had to deal with one.??? HELP!!!