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2013 MS p85 Body Control Unit Location/Replace


Sep 30, 2019
Naperville, IL
Having issues with my physical trunk button working intermittently and my headlights randomly going out. Service says I need to replace the bcm in my 2013 ms but I’m having a hard time finding any details on where it’s located or how to replace it myself. Service Center wants about $1600 to do it. So far all I can find is that it is located behind the passenger footwell firewall but I can’t find any instructions on how to access it. Also if I am able to replace it myself, does anybody know if I will need to do any reprograming of the key fobs and/or do I need to have the most recent firmware staged for a redeploy once the new bcm has been installed. Thanks in advance for any help as I’m guessing I’m not the only one who may have to do this.

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