Air bags are a dangerous thing to work with. Basically enough explosives to kill or hurt someone. And the kicker is that they can be set of with just static electricity! Thanks for the link above.

I am trying to find out what circuits the computer is talking about. I did find a reference in benzworld about a clock spring problem when those codes are found. Unfortunately a different chassis number but hopefully the same system. See the following link. http://www.benzworld.org/forums/r171-slk-class/1218479-alldata-mercedes-technical-service-bulletins-recalls-3.html

If I am interpreting correctly what was said in the link above there is a software problem ( BUG is what was said below the reference codes ) and a software update probably has not been installed to resolve the issue. Newer cars like this one do need to have the proper updates to the software to work correctly.
Thanks John