AutoVEI – D2451S0067 – MB ACM2/2.1 – ACM2/2.1/2.2 – Flash & EEPROM Read / Write by OBD / DC

ACM / Airbag Control Module

• The ACM (Airbag Control Module) is a safety‑critical ECU that stores airbag deployment logic and event/impact data.

• Modules like MB ACM2 / ACM2.1 / ACM2.2 are generations of Mercedes‑Benz airbag computers.

Flash & EEPROM

• Flash memory stores executable code and calibration data.

• EEPROM stores configuration and non‑volatile data (e.g., crash logs, VIN, coding).

OBD vs Direct Connection (DC/Bench)

• OBD (On‑Board Diagnostics): SAE J1962 port interface — safer and supported by some commercial tools.

• Direct/Bench (DC): Connects to pins on the module’s programming interface — allows deeper read/write access but requires opening the module.