Airbag control unit with part number 13256904

What does the airbag control unit 13256904 do?

The airbag control unit 13256904 coordinates the restraint system (SRS) of Opel. It processes the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners fire, and monitors the system continuously. After an accident it stores crash data and goes into lockdown.

The sensors supply measured values, which the unit evaluates against fixed criteria.

If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster.

Why does the control unit 13256904 fail?

The most common cause is crash data stored after an accident, even if no airbag has fired; a standard diagnostic tool cannot remove it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The crash data is stored in the control unit. Nothing of it shows on the displays.

The other causes arise from everyday use of the vehicle: components age, contacts deteriorate through moisture and corrosion, and voltage spikes stress the circuitry. Voltage spikes occur when starting with a weak battery or when jump-starting.

How can you tell that the 13256904 is defective?

The airbag warning light in the instrument cluster stays on at the 13256904 permanently or intermittently. In addition, an error message appears, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The airbag warning light is the most visible sign the system gives. Until the check provides clarity, the indication should be treated as a serious warning signal.

Only the check shows whether the unit itself is affected. Airbags and seatbelt pretensioners may then not trigger in an emergency.

Which vehicles is the 13256904 fitted in?

The airbag control unit 13256904 is fitted in these vehicles: Opel Corsa D (2006-2014).

The assignment is listed clearly here:

• Opel Corsa D (2006-2014)

Comparing the part number on the label of the removed unit with this page only shows that it is the correct unit. The cause is established only by the fault memory, which you have read out beforehand. Only this log shows whether the control unit is defective or a connector or cable is affected.

For the same vehicles, we also repair control units with the part numbers 13 283 819 HB, 13256903, 13256905 CC, 13283819, 13379528 HU, 13379529.

How does the repair of the 13256904 work?

First have the fault memory read out and enclose the log. Then disconnect the battery; only after that remove the control unit 13256904. Finally, create a repair order online and send the unit in, well packed.

At Airbag24 the unit is examined on the test bench. Defective components are specifically replaced, and the stored crash data is erased. A function test follows before your unit goes back.

The work at Airbag24 usually takes 3–4 working days.

Our repairs come with 2 years' statutory liability for defects. 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.

How does the control unit 13256904 get to Airbag24?

You send the control unit 13256904 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the parcel, and you pack the unit shock-proof.