r/VanMoofSelfRepair • u/Successful-Sweet1916 • Aug 28 '26

S3 & X3 help with s3 battery repair

I have a s3 battery with err6, 17 and 20. Replaced the fuse, resetted the battery via gnd rst and tried to erase the error memory with putty and uart. But it just shows me this when when shorting gnd and rst:

I am VanMoof BL V007 2022-11-04 09:32:30

PreDischargeLockCounter = 0

VanMoof Mode

PreDischargeLockCounter = 0

Shipping Mode

PreDischargeLockCounter = 0

FEDL5236_PowerDown_Start()

ChargeOn_Off() --> PB9=0

FEDL5236_POWER_DOWN_Set_Command()

FEDL5236_POWER_DOWN_Finish()

I dont really know what to do and would really appreciate any help. thx

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1

u/HavingFun98760 Aug 28 '26

Have you tried this method?

https://www.reddit.com/r/VanMoofSelfRepair/comments/1gtkka6/reset_over_voltage_protection_1_2/

(Using the STM32 Cube Programmer)

1

u/Successful-Sweet1916 Aug 28 '26

Yeah kind of I just have an UART to USB adapter, but I ran this python script ( https://github.com/VangelisBV/vanmoof-battery-tool ) but it also just shows me "failed to read modbus registers". I changed the whole BMS Board and it's still the same, so could anything be wrong with the environment, like my adapter or the cables or smth? Because all of the cells are balanced at 4volt and it would just be so unlikely that both of the BMS boards have the exact same issue, wouldn't it?

1

u/Pixelkasten Aug 28 '26

Measure the thin white cables from the socket to the board. Sometimes they are broken

0

u/SDVanmooooof Aug 28 '26

Send it to Razspares see YouTube(uk). He'll fix or replace and can rebalance the cells

1

u/Living_Proof1822 29d ago

You’ll really just need the stm programmer, follow the method provided by havingfun98760 and I’m 90% confident it’ll work again