Bought a really gorgeous 2008 - ML550 in early 2017. The car one problem. The steering wheel controls were gooey and sticky. New switch packs are not available, and the decals would not have worked with this problem. I tried several chemicals to wipe off the mess, but that didn't work either. So I bought a 2010 Wood and Leather wheel to match my old one. Then I bought an airbag to match the new wheel. All was good. I installed the new wheel and airbag, and sold my old one on eBay. When I did the installation all went well, until I forgot and turned on the ignition with the airbag disconnected! So it threw an SRS light of course. I lived with it for a while and didn't think much of it. After a while I bought am MBII Carsoft unit, and found that my cam magnets were bad, but also that I could not reset the SRS. MBII claims resistance is too low (.90 vs 2.85) as compared to the other three airbags in that circuit. I wouldn't have thought that this simple OEM change out would have created this issue. Should I try to resist it up, with a resistor between the airbag and the system, or should I just get another airbag? What should the airbag resistance be for those two year airbags on a W164 from 2008 and 2010?


Did you accidently turn the clock spring from the center location? Also are the rest of the buttons on the steering wheel working properly? 

What you describe is often caused by a bad clock spring and not the airbag.


What was the exact code that you received?  Also call the dealer and get  a quote for a new airbag. When you get quoted, ask if coding is required. I don't think so, but there is sure way to find out. 




I thought that the clockspring would click when it has failed? code is "9211 Resistance is too low" for drivers airbag.
Thanks, Chris

Not necessary.  In most cases it does not. If the low resistance if for drivers airbag, I think it is a clock spring issue. 

I guess I will buy a new one, $213. Used ones on eBay are cheap, but I have no interest in taking it apart in my driveway, in 0 degree weather two or three times until I get a good one. Thank you for all of your help with this persnickety problem.

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