The post is correct, the "StarMag" had a detailed article. The proceedure is to remove airbag, steering wheel, contact spiral, and the connector uner the dash. Dont forget to have your radio code!
The STAR is a publication for Mercedes Club of America members, they sell back issues for $4 and I think they sell "tech bulletins". It is worth the $45, for the six great publications with tech tips, reviewas and want ads, and local club membership. 800-637-2360