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Rizsin23

Battery Management System

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Hi all, I was curious if the 2014 Edge SEL has a connector for the BMS? Where is it located, and can it be disconnected without causing harm to the vehicle, battery, etc...my problem is that even after I charge the battery and the charger shows 100%, the forscan app does not. It's about 85-89%. I don't know if this BMS has anything to do with it, and if it can be changed. Any information would be welcomed. Thank you!

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yes, could definitely be the BMS.  There is a current sensor on the positive terminal.  But not one case of it being a problem yet.

 

You either have a bad +ve battery terminal, have not allowed the battery to rest 8 hours or more after charging to allow the BMS to reset itself, have a parasitic draw, or have a battery slowly going kaput.

 

You can force the BMS to reset by using Forscan Lite, or have the dealer do it.  Sometimes the "automatic" system does not work correctly.

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On pre 2015 models the battery management system can be reset by leaving the vehicle uninterrupted for 8 hours as @WWWPerfA_ZN0W stated above. Newer models need ForScan or a dealer to reset the battery age. At least that's what I understood from my readings on the systems.

Also, on my 2016 with a new Motorcraft battery, it does not go above 80-85%. So it is either programmed like this, which makes sense as it is generally followed not to keep batteries charged to near full capacity to get a longer service life, or that even my Edge has a fault.

 

Another thing, there is a As Built Data setting in the BCM that has to do with battery type/model, but with both my current Edge and previous MKX it did not match the actual installed battery from the factory.

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Thanks for the responses guys. I have tried everything to rule out a parasitic draw, cannot find anything. The battery was replaced 38 days ago with a new Motorcraft 65 series.I reset it via forscan when I installed it.  I wanted the extra CCA as I live in New Hampshire and it gets very cold here. Not sure how I can find out if it's the +ve lead...The vehicle sits for 9+ hours uninterrupted every night in my garage...

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Just a follow up on this. I disconnected both the positive and negative sensors on the battery, have not had a problem since 😀

 

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