Anyone have a bentley manual to check the troubleshooting section for me?

Im throwing an airbag error code and my cruise control/radio functions are dead.
I just removed the wheel to double check to see if the connectors popped off but all is fine. I DID notice that the white "hub" behind the wheel has more play than i remember when i put the JCW wheel on last year. I get the feeling that i need to replace that plastic hub thingamajigger.

any ideas?