Chip-Tools

ITDEENBGES

Mercedes-Benz Battery Unlock / Reset: unlocking Mild Hybrid, Plug-in Hybrid and EV batteries with FBS4 Manager

Function for unlocking or resetting the batteries on Mercedes-Benz Mild Hybrid, Plug-in Hybrid and electric vehicles. It also lets you read and clear the DTCs stored in the battery modules, provided the faults are not permanent. Work over OBDII on the car or on the bench.

Procedure

1. ON-CAR CONNECTION - Connect the AVDI interface to the vehicle's OBDII diagnostic port.
2. BENCH CONNECTION - For BMS222MH modules use the CB013 cable, which is required for connecting to BMS units; for LIB48_222 modules you need the male DB25 connector, wired as per the diagram in the manual.
3. Start the FBS4Manager software.
4. Select the correct unit type from the drop-down menu.
5. Press the "Info" button to read the unit information and the battery status.
6. Check the voltage reported: if the module is below 36 V, stop here, remove the battery module and charge it from an external supply before continuing.
7. With the voltage in order, press the "Unlock" button to run the unlock/reset procedure.
8. If needed, use the function for reading and clearing the DTCs stored in the battery modules: faults will only clear if they are not permanent.

Reference screenshots