One problem related to side/window air bag has been reported for the 2009 Mercedes Benz C Class. The most recently reported issues are listed below.
My daughter was in a crash today on may 16, 2009 she was driving mercedes 2009 c300 and she said that the steering wheel lock suddenly before she crash, she was driving only at 15mph that why the impact was not so severe, we are very lucky that she just has minor injuries.