SRS light on after steering wheel change - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 03-20-2008, 12:17 PM Thread Starter
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Smile SRS light on after steering wheel change

I decided to change the steering wheel on my 2000 W208 CLK55 AMG to an all-black rather than the dual tone black/silver. Unscrewing the airbag unit was no problem but I then ran into difficulties disconnecting the wire between airbag and steering boss area. What I now know is that I was trying to disconnect the wire from the boss end rather than the yellow connector into the airbag itself. Supid me! While I was doing this I became concerned that the plug-like connection into the boss end was becoming slightly loose (as I was being quite forceful in my attempts to undo it) and I was concerned that when I put everything back together there would be a problem. Fortunately everything seemed to go back OK and no waring lights showed. But today I got my local garage to change the wheel and when they got it all back together the SRS light immediately came on and stays on whenever the engine is running. His diagnostics specified "No4 airbag driver". Can anyone suggest what might have happened here. Could it be that my previuous over zealous attempts to remove the wire at the wrong end has now come home to roost? The garage man muttered something about the "squib" perhaps needing to be replaced (a common problems with Peugeots apparently). It that the unit at the top of the sterring column/boss from which the airbag wires come out? Any thoughts/help would be much appreciated.

Last edited by plip1953; 03-20-2008 at 12:20 PM.
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post #2 of 5 (permalink) Old 03-20-2008, 12:36 PM
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Unfortunatly it does sound like the problem originated with your attempts to remove the connector. The SRS system in a Benz is very particular and always measures the resistance through each of the airbag squibs(these are what ignites the airbag). If the resistance through one of the squib circuits becomes more than 0.2ohm(might be 0.3 dont remember) then an SRS code will come on. By messing with the wrong connector I would be willing to bet you made the resistance in the circuit go over that limit. This harness can be rapaired, but it has to be done perfectly by someone who knows what they are doing. The only other option is to replace the harness.
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post #3 of 5 (permalink) Old 03-20-2008, 12:53 PM Thread Starter
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Thanks. When you say "wiring harness" does this entail much in terms of labour/parts? In other words, what has my hamfistedness cost? Also, should I take it to a MB main dealer or might I be better trying to locate a non-MB SRS specialist?
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post #4 of 5 (permalink) Old 03-20-2008, 04:38 PM
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Cool Hey Phil

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post #5 of 5 (permalink) Old 03-21-2008, 02:58 AM
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you need to remove the airbag and check the connections. either you or the shop messed something up. if the connecters are damaged, the harness is about 6 inches long and shouldnt cost more then $20-30. the harness connects into the clock spring.
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