A 2017 Mercedes-Benz C200 had a slight collision accident, and the airbag / SRS light flash on the dash. Scan the car and get a code “B272200 – the control unit is not locked” in Supplemental Restraint System (SRS) control unit. Below are the solution to erase the code.


Step 1: Connect MS908S with car via OBD port, select right vehicle model, then go to: diagnosis > control unit > SRS (Supplemental Restraint System) > control unit adaptation.

Step 2: Select: configuration.

Step 3: Choose: manual configuration > special configuration.

Step 4: Choose: lock and unlock > control unit lock.

Step 5: The device shows the SRS control unit is being reset, please waiting. Click “continue” after the process loading is completed.

Step 6: This function finished. Then choose the code B272200 to erase.

Step 7: The code is erased. Scan the car again and no fault code detected.


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