B193E - Deployment data memory full (crash data) airbag control unit fault

What does error code B193E mean in the airbag control unit?

Error code B193E reports that the recording memory for the deployment event is full, that is, the memory for the crash data of an accident. The restraint system is therefore affected, and the airbag control unit stores this fault in the fault memory and switches on the airbag warning light so that the fault is shown in the vehicle.

Crash data is the recording of a deployment event, which is stored in the airbag control unit. The code therefore indicates that there is no longer any room for this recording.

The affected part is therefore the crash data memory in the airbag control unit, and not an individual component.

How do you recognise error code B193E?

You recognise error code B193E by the airbag warning light, which stays on permanently, and by the entry in the fault memory of the airbag control unit. The code cannot be permanently erased, and it is read out with a diagnostic tool that retrieves the fault memory of the control unit via the diagnostic interface.

A permanently lit airbag warning light on its own does not yet show that the memory is full. Only reading out the fault memory shows error code B193E, which reports a full crash data memory.

Error code B193E is therefore a finding within the control unit itself, and not a message about the wiring.

What causes error code B193E?

Error code B193E arises within the airbag control unit itself, because its crash data memory is full. The possible causes are crash data from an accident, aged electronic components, solder joints, moisture or corrosion, and voltage spikes from a weak battery or from a jump-start, although the cause only becomes clear during inspection.

• Crash data from an accident that fills the memory
• Aged electronic components in the airbag control unit
• Solder joints, moisture or corrosion in the control unit
• Voltage spikes from a weak battery or a jump-start

Which cause applies only becomes clear during the inspection. The battery and its voltage are among the first points to be checked.

In which vehicles does error code B193E occur?

Error code B193E is known on MG vehicles, including the MG 3, MG 4, MG 5, MG ZS, MG HS, MG Cyberster and MG IM5. The list is not complete, and on other vehicles the meaning of the code may differ.

Whether a particular vehicle shows this code can only be determined by checking the fault memory with a diagnostic tool. The list is therefore a guide and does not replace this check, even if the make and model match.

How is error code B193E resolved?

Error code B193E is resolved by first reading out the fault memory with a diagnostic tool and then narrowing down the cause step by step, before the repair follows. Because the memory in the control unit itself is full, the route in this case leads via the control unit.

Work on the airbag system should be left to qualified professionals. If the cause lies within the control unit itself, you first disconnect the battery and then remove the control unit.

You then create a repair order online and send the unit to our workshop in Berlin. Checking, repairing and testing usually take 3–4 working days.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.