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#1
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![]() 2011 BMW 328I sedan with 120K, no accidents . I was expecting the MS908P to be pretty strong with Live MRS system data and be able to graph and watch resistance values of airbag circuit PIDS change and spike while wiggling harnesses , but there only seemed to be less than a half dozen very rudimentary ones like if seat belt was engaged or passenger airbag switch is on or off
![]() The aftermarket repair software information didn't even offer MRS code charts, let alone diagnostic help with any specific codes. I have a code 9419 (MRS) left belt force limiter. I thinking it is something behind the left B pillar inside the driver side "front" seat belt re-tractor assembly, the BMW parts guy tends to believe I need to replace the LF seat belt pre-tensioner but the code description of left front belt "force limiter" seems to me like the opposite of what the pretensioner does when it deploys. ![]() Last edited by Witsend; 05-07-2019 at 03:16 PM.. |
#2
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![]() Yep , LF seat belt pre-tensioner /end release buckle assembly fixed the 9419 code. Sure glad it wasn't a Miss on the MRS or I could be married to it.
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#3
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![]() glad you fixed it, just read it now.. regarding BMW live resistance readings though in a scan tool, yes, its true you cant really get "live" readings, would be nice though,
instead, even the factory tool ( BMW ista ) will read the resistance one time, not dynamically. then you can unplug the airbag for instance, then "re-check" the resistance again and it will update it. note.. a lot of factory tools now are offering really good walk throughs, or diagnostic trouble charts/trees...what ever... on their faults. and its not like suretrack which is only generic obvious stuff. it will walk you through pretty much ALL fault codes with wiring diagrams, description of operation, repair instructions, basically everything.. |
#4
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![]() looks like I will remove new and reinstall the old part and just ship it, and eat the new part or try to sell it off E-bay, if one last check of connector being fully seated. Next to nothing about diagnosing and fixing 9419 code on the internet ![]() Last edited by Witsend; 05-09-2019 at 06:38 PM.. |
#5
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![]() if you have time, maybe try this...
you stated this is a sedan... because that fault also refers to a rollover bar, right open circuit. sedan shouldn't have a roll over bar... other than that the fault states, " belt force limiter, left " have you also tried a hard battery reset?? edit..I may be wrong because i see a transistor after 30, which means it may be 12v switched at pin 1, so you may not have 12v at pin 1. if this is the case, then one would access the mrs module and test the wires from the mrs module, to the limitor connector Last edited by tech25; 05-10-2019 at 08:29 AM.. Reason: info regarding transitor |
#6
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![]() Quote:
![]() ![]() Last edited by Witsend; 05-10-2019 at 09:20 PM.. |
#7
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![]() I know, I know. You should never test the actual components of an AirBag system with a DVOM.
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#8
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![]() that appears to be correct resistance, so the part is the not problem. thats why earlier i said to test the wiring from the mrs module to the tensioner, if the wiring is good. then its a module. ( or a hard reset, or repogram/code ) and test
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#9
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