93D4 - Crash message stored airbag control unit fault

What does error code 93D4 mean in the airbag control unit?

Error code 93D4 indicates, on BMW vehicles, that a crash telegram, in other words crash data, is stored in the memory of the airbag control unit. The affected part is therefore not a single component such as a sensor, but the airbag control unit itself, which records the fault in the fault memory and switches on the airbag warning light.

The airbag control unit is part of the restraint system (SRS), because it triggers the airbags in the event of a crash. As long as the fault is stored, the airbag warning light stays on.

Crash data is generated after an accident. Its entry in the control unit forms the basis for this error code.

How do you recognise error code 93D4?

Error code 93D4 can be recognised by a permanently lit airbag warning light and by an entry in the fault memory that cannot be permanently erased. The code is read out with a diagnostic tool, which retrieves the fault message from the airbag control unit as soon as it is connected to the vehicle.

The finding therefore shows in two places, on the dashboard and in the fault memory. As long as the entry is there, the fault is not considered resolved.

What causes error code 93D4?

The possible causes are crash data from an accident, voltage spikes from a weak battery or from a jump start, aged electronic components, soldered joints, and moisture or corrosion in the airbag control unit. The cause therefore lies in the control unit itself and not only in a plug or a cable.

• crash data from an accident that is stored in the control unit
• voltage spikes from a weak battery or from a jump start
• aged electronic components in the control unit
• faulty soldered joints in the control unit
• moisture or corrosion in the control unit

Which of these causes applies in an individual case only becomes clear once the control unit has been tested.

In which vehicles does error code 93D4 occur?

Error code 93D4 is known on BMW vehicles, including the models BMW X3 G45, BMW X5 F95 M, BMW XM G09 and BMW i5 G60. So far, the code is only known for the BMW brand, to which all the model series mentioned belong.

On other vehicles the meaning of this code may differ, and the list is not complete. What matters, therefore, is the specific vehicle on which the code occurs, that is, make, model and model series.

How is error code 93D4 resolved?

Error code 93D4 is resolved by first reading out the fault memory with a diagnostic tool, so that the cause can be narrowed down more precisely. If the cause lies in the control unit itself, the unit is sent in for repair to Airbag24 in Berlin after removal, via a repair order.

Work on the airbag system should be left to qualified specialists.

If the cause lies in the control unit, first disconnect the battery and then remove the control unit. Then create a repair order online and send the unit to Airbag24.

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.