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E-Class (W211) 2003-2009

SRS light problem

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Old Oct 14, 2011 | 09:40 AM
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SRS light problem
My SRS light came on out of the blue, took it to a mate with a diagnostic and got fault 9920 "ignition circuit with component R12/9 (drivers side airbag ingition squib) has short circuit to ground"

any idea's regarding this fault before i start ripping the steering coloum to bits??

Car is a 03 E class 270 cdi
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Old Oct 14, 2011 | 11:52 AM
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Remove seat back and check squib connector to side airbag harness - blue/yellow wiring with orange/green connector.
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Old Oct 14, 2011 | 12:56 PM
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Thanks, i'll have a look
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Old Oct 15, 2011 | 01:13 PM
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ok, checked the connector into the airbag & the main connector under the seat, nothing obvious but cleaned em and sprayed with WB40. if it was a dodgy connection, am i right in thinking the light would not go out on it's own and it would have to be reset via diagnostic tool?
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Old Oct 15, 2011 | 05:53 PM
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Originally Posted by mak595
am i right in thinking the light would not go out on it's own and it would have to be reset via diagnostic tool?
Correct, stored fault code(s) need to be erased using SDS. If problem persists, resistance value “may” be too high requiring connector replacement utilizing repair harness part # 0025402305
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Old Oct 16, 2011 | 04:06 AM
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thanks, i'l nip down to my mates 2morrow and see what his diagnostic says
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Old Oct 18, 2011 | 04:17 AM
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Sorted, reset code and the light stayed out, thanks again Konigstiger
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Old Nov 14, 2011 | 04:50 AM
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Damn, the lights come back on again after a couple of weeks guess i'll try the wiring repair harness, any idea of the price?
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Old Nov 15, 2011 | 06:19 AM
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Ordered a loom from MB, £19.99 so hopfully that will sort it..
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Old Jan 18, 2020 | 11:10 AM
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i have the same cod
Originally Posted by konigstiger
Remove seat back and check squib connector to side airbag harness - blue/yellow wiring with orange/green connector.
i have to check that as well. will this cause my battery to drain as well? thanks
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Old Jan 19, 2020 | 02:52 PM
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I believe I’ve repaired this problem in the past by bypassing the X connector under the seat with the w220 X connector repair harnesses. No it shouldn’t drain your battery. This was a repair fix for the 209 clkS as I recall but also works for the w211
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Old May 23, 2021 | 07:13 PM
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Originally Posted by konigstiger
Remove seat back and check squib connector to side airbag harness - blue/yellow wiring with orange/green connector.
would this connector look the same on a 2007 GL?

you guys got any pics of it?
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Old May 24, 2021 | 10:30 AM
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