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-   -   Battery change and BMS reset? (https://www.focusfanatics.com/forum/mk3-focus/752153-battery-change-bms-reset.html)

spots 01-28-2019 05:03 PM

Quote:

Originally Posted by novus (Post 11358419)

thank you

Ductape91 01-28-2019 05:59 PM

Arent you able to reset the bms just by letting the car sit overnight or unused for a specific period of time(x amount of hours) without the use of a scanner or forscan?
Pretty sure i read that in a thread before with that being procedure mentioned.

spots 01-28-2019 06:24 PM

Quote:

Originally Posted by Ductape91 (Post 11358429)
Arent you able to reset the bms just by letting the car sit overnight or unused for a specific period of time(x amount of hours) without the use of a scanner or forscan?
Pretty sure i read that in a thread before with that being procedure mentioned.

some cars maby but no these ones hence the service manual entry

FFhb13 01-28-2019 06:34 PM

I got some weird things going on with my battery.. sometimes when go to my car, before I unlock I see on the screen, a little status bar and it says "shutting off car to save battery" but it's been on all night and then when I start the car, it's like the battery is drained, pushbutton start takes like 3 or 4 seconds of cranking..if I press pushbutton once to power acessories with car off, it turns off after not even 4 minutes.. used to stay on for 10 to 15.. battery is still testing good, it's 590CCA, testing around 520CCA but close to replace... anyone have any good recommendations for batteries, I would like a AGM type with more CCA then oem. Optima redtop used to be a go to, they are not as good anymore and too expensive

spots 01-28-2019 08:57 PM

Quote:

Originally Posted by FFhb13 (Post 11358453)
I got some weird things going on with my battery.. sometimes when go to my car, before I unlock I see on the screen, a little status bar and it says "shutting off car to save battery" but it's been on all night and then when I start the car, it's like the battery is drained, pushbutton start takes like 3 or 4 seconds of cranking..if I press pushbutton once to power acessories with car off, it turns off after not even 4 minutes.. used to stay on for 10 to 15.. battery is still testing good, it's 590CCA, testing around 520CCA but close to replace... anyone have any good recommendations for batteries, I would like a AGM type with more CCA then oem. Optima redtop used to be a go to, they are not as good anymore and too expensive


battery testing good but is your alternator ? also with the tools you use to reset the bms you can also use it to look at the errer codes on both low speed and high speed can bus.

thats right them $10 cheapo scan tools at walmart dose not pick up or read all the errer codes.

BrApple 01-29-2019 09:40 AM

I just picked up this code scanner. It had an option to reset the battery monitor. I used it when I replaced the battery in my car. I believe it worked.

I only had the radio turn off once after a few minutes. Haven't tried for any length of time but I haven't noticed any issues. Battery the first day seemed to be charging normally. The old battery was consistent at 14.6-7 volts, the new one was more variable, but that makes sense to me. Will have to check it again.

spots 01-29-2019 10:13 AM

i have gotton the low battery a few time since i first reset it. just do a quick reset and it all works like it should again lol. i thank they make it so you would thank its bad when its not. i reset it like 3 time so far with the same old battery in it. still works as it should each time

spots 01-29-2019 01:44 PM

Quote:

Originally Posted by JoshuaCurrie (Post 11358415)
My Focus is coming due for a battery can I just replace the battery and call it good. I spoke with 2 different dealerships in my area and they told me That the BMS will reset itself and they never heard of it needing to be reset.


just to show more proff right from my copy of the manual https://i1174.photobucket.com/albums...psqmp30nnq.png

JoshuaCurrie 01-29-2019 03:41 PM

After some shopping around I found that I'll just take the car to the dealership for a battery replacement. A battery from O'Reilly is 129 and a battery from Autozone is 159. The dealership told me it's 150 plus tax to replace the battery so that's the route I'm going to take. Thanks everyone for the info.

spots 01-29-2019 04:00 PM

Quote:

Originally Posted by JoshuaCurrie (Post 11358705)
After some shopping around I found that I'll just take the car to the dealership for a battery replacement. A battery from O'Reilly is 129 and a battery from Autozone is 159. The dealership told me it's 150 plus tax to replace the battery so that's the route I'm going to take. Thanks everyone for the info.

keep in mind they may or may not reset the bms and if they dont they may fight you about it.


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