Friend of mine called me today asking me if I could help him get a 2004 CL AMG started. The car's instruments will come on and cycle but it will not crank over. Trying to start it all the starter will do is click ones and then stop. Then the screen on the instrument panel says remove key. Tried jumping it with another vehicle but it wont do anything. Is there anything special about these cars? I have no trouble working on other cars but German vehicles I never mess with.