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

amc49 01-29-2019 05:06 PM

You DO realize of course that no car will run forever without 'resetting the battery' on its' own right? The alt does it on its' own or it is not working correctly. Impossible not to.

Ford just created one more gimmick to scare people to go to the dealers there.

Let the car sit with new battery in it at least 8 solid hours and may need more, then problem is gone. Without Ford's quick reset method the battery does it by itself but a time based thing.

spots 01-29-2019 05:18 PM

Quote:

Originally Posted by amc49 (Post 11358735)
You DO realize of course that no car will run forever without 'resetting the battery' on its' own right? The alt does it on its' own or it is not working correctly. Impossible not to.

Ford just created one more gimmick to scare people to go to the dealers there.

Let the car sit with new battery in it at least 8 solid hours and may need more, then problem is gone. Without Ford's quick reset method the battery does it by itself but a time based thing.

yeah tell that to mine that will go for yrs with out auto resetting. its in the bloody shop manual what more proof do you need. they dont auto reset and fyi cars will run fine like they always have with them not reset. only thing it effects is the accessory like the 1hr mode and such.

Ldsundance 01-29-2019 07:37 PM

when doing the bms reset it resets the computer for the age of the battery, so this only needs to be done when a new battery is being fitted, when dealers have said leave it it will reset they are getting confused, it wont reset the bms but it recalibrates

Battery Monitor Sensor

"The Battery Monitor Sensor measures temperature, voltage and current throughput of the battery. It uses this information to calculate the battery SOC (State of Charge). To function with high accuracy, the Battery Monitor Sensor must be recalibrated at regular intervals. A recalibration occurs during a rest period when the battery quiescent current is less than 100mA. This rest period must last for at least 3 hours. The longer the rest period, the greater the accuracy.
The timeframe in which a recalibration must take place is seven days. If the system has been unable to carry out a recalibration within 7 days, the SOC accuracy cannot be guaranteed. This will result in the Start Stop and SRC systems being deactivated."

with batteries they do wear over time you cant tell everything from just voltage and Checking CCA you need to check capacity too, for example i have a 110ah leisure battery, voltage it could hold at 12.8v and using a digital drop tester cold cranking amps were good and internal resistance was showing good too, however doing a test with a 21w bulb the voltage dropped to about 10.5v in under an hour

henrymai 04-03-2019 04:29 PM

Quote:

Originally Posted by E365/5 (Post 11344873)
Procedure

Note: Only reset the sensor if the battery was replaced.

Vehicles without rear fog light key:

Perform steps 1-3 within 10 seconds

1. Ignition ON, Engine OFF
2. Activate the headlight flasher 5 times.
3. Fully depress the brake pedal 3 times.

4. If the battery charge indicator lamp in the instrument cluster flashes 3 times in 15 seconds, then the reset was successful.

By "Activate the headlight flasher", do you mean flash the highbeams or do you mean press the hazard lights button?

DVO91 06-24-2019 09:26 PM

1 Attachment(s)
I bought a new oem battery for my '12 Focus SE sedan. Before changing the battery in the test mode screen I had no DTC. After replacing battery I have a DTC code. I don't have engine light on, car shifts fine, my windows work and TPMS are fine. I did not do BMS. I have torque pro but don't see an option for this, has prettt much everything but bms. Battery shows proper voltage when off and when on but I have this new DTC code. What ya guys think??

DVO91 06-25-2019 09:39 PM

I tried this method and it sent me to a test screen to train my TPMS


Quote:

Originally Posted by ovidiur (Post 11341813)
Quote:

Originally Posted by Bud Bundy (Post 10786169)
For a reset of the BMS:
1. Switch on ignition (do not start engine)
2. Switch on dipped beam
3. Press 5x the rear fog light button (do not switch 5x on and off the rear fog light)
4. Press 3x hazard lights button (do not switch 3x on and off hazard lights)
5. Then the battery symbol in the speedometer should flash 3x quickly.
If it does not flash immediately, wait 20 seconds.

Can someone confirm that this method posted by Bud Bundy is working?



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