Vehicle has a rear fog light button:
1. Enter vehicle and perform the steps 2 to 4 within 10 seconds.
2. Switch ignition ON, engine OFF (Position II).
3. Push and release the rear fog light switch five times.
4. Push and release the hazard warning light switch three times.
5. If successful the charging system warning light on the instrument cluster will blink three times within the next 15 seconds.
6. BMS reset done
Vehicle does NOT have a rear fog light button:
1. Enter vehicle and perform the steps 2 to 4 within 10 seconds.
2. Switch ignition ON, engine OFF (Position II).
3. Pull and release high beam switch five times.
4. Press and release brake pedal three times.
5. If successful the charging system warning light on the instrument cluster will blink three times within the next 15 seconds.
6. BMS reset done

 

Vehicle has a rear fog light button:
1. Enter vehicle and perform the steps 2 to 4 within 10 seconds.
2. Switch ignition ON, engine OFF (Position II).
3. Push and release the rear fog light switch five times.
4. Push and release the hazard warning light switch three times.
5. If successful the charging system warning light on the instrument cluster will blink three times within the next 15 seconds.
6. BMS reset done

Thanks @Hype® , the first method worked perfectly.

I found the other method of flashing the high beam last night which didn't work.

 

I've never hear that before so thabks for the advice 👍🏻 litterally thought buy new battery and swap over.

 

Done this recently and worked like a charm

 

Hi @Hype® just going to go and try this now.

 

Tell me how it goes, I have 2014 st with rear fog lights and this works. Maybe you will need to click more then five times hazard lights. Pay attention to red battery symbol. Should flicker 2-3 times

 

What is this for? I recently changed my battery and didn’t do this

 

Interested to know more about this and if this should be done after reconnecting the battery after working on electric systems?

 

Battery management system, as a battery ages the car will treat the battery differently with regards to alternator output as it senses its degrading charge limit ,a reset allows a new battery to recieve full charge again . Most car manufacturers also allow a change in specification as part of the BMS reset, if your using the same spec battery you shouldnt need to worry about that part, if you have changed the spec of the battery you may also need to use software like Forscan to code that new battery spec too.

 

Most car manufacturers also allow a change in specification as part of the BMS reset, if your using the same spec battery you shouldnt need to worry about that part, if you have changed the spec of the battery you may also need to use software like Forscan to code that new battery spec too.

I was reading about this before, but from what I could see, FORscan took out lists of pre-set battery sizes/capacity, and the BMS in the Fiesta won't pickup or adapt to the higher spec battery.

I have fitted this 574 402 075 | Varta Automotive which is of both higher CCA and capacity to the factory fitted Ford Varta battery.

I haven't attempted to change anything in FORscan if the old lists were removed, and the only thing that I had possibly thought about doing was to increase the State of Charge to something other than 80%.

 

Changed my battery 2.5 years ago and didn't know anything about battery management reset on this cars so it never got done and have had no issues so far.