Mercedes-Benz E Class (W212) S Class (W221) 2013-2016 HV Lithium Battery Repair File Service

In order to use the service, you need to provide us the original file of your battery BMS or the exact part number of the battery and your VIN.

File can be read and written with any programmer supporting 95256 EEPROM, such as VVDI Prog, VVDI Multiprog, CGPro, etc.

In some cases, also reading the processor will be needed, so it is best to have also a tool to read the TC1797 processor inside as well. At the moment our solution uses JTAG mode.

After our file is written, remember to charge your battery to max before reinstalling the BMS back into the battery or it will lock again!
To test if your BMS has not been locked, you need to have a car. If you just check with a multimeter the outer terminals of the battery controlled by the BMS to see if the voltage matches with the battery internal terminals when the battery is not active, voltage will always be 0! If active, it will however click once and then show voltage regularly whether in or out of the car.
We will refund you if service failed or prepare a new file.

Service provided in few minutes during workhours.