Airbag control unit with part number 56D959655

What does the airbag control unit 56D959655 do?

The airbag control unit 56D959655 is the central control unit of the restraint system (SRS) for Seat. It evaluates the crash sensors, decides in an emergency within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The monitoring runs in the background: sensors, wiring and airbag output stages are checked continuously. If the unit detects a fault, it records it in the fault memory and reports it via the airbag warning light.

Why does the control unit 56D959655 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot delete it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Crash data remain in the memory until they are deliberately removed. With this unit, Airbag24 deletes them as part of the repair.

The other causes are general in nature: components age, solder joints go cold, and moisture and corrosion in plugs attack the contacts. Voltage spikes arise, for example, from a weak battery or after jump-starting.

How can you tell that the 56D959655 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and through a fault message there. In addition, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be cleared. Then airbags and seatbelt pretensioners may not trigger in an emergency.

These signs appear individually or in combination:

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

The warning light is a direct warning signal. Simply ignoring it would mean leaving the restraint system without any control.

Which vehicles is the 56D959655 fitted in?

The control unit 56D959655 is fitted in these vehicles: Seat Ibiza 4 [6J] Facelift (2012-2015), 4 [6J] (2008-2012) and 4 [6P] (2015-2017).

The following list shows the vehicles stored for this part number.

• Seat Ibiza 4 [6J] Facelift (2012-2015)
• Seat Ibiza 4 [6J] (2008-2012)
• Seat Ibiza 4 [6P] (2015-2017)

Two steps will help you. First, compare the part number on the label of the removed unit with this page; this way you make sure that it is the correct unit. Second, have the fault memory read out in advance, because only it shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 6C0 959 655 J, 6C0959655L, 6R0 959 655 K, 6R0959655C.

How does the repair of the 56D959655 work?

First have the fault memory read out, attach the log, then disconnect the battery; only then remove the control unit. Afterwards create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

The sequence is mandatory for safety reasons. The fault memory is read out first, then the battery is disconnected, and only then is the control unit removed. Attach the log to the parcel.

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 56D959655 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

The printed repair order goes into the parcel. Pack the unit shock-resistant so that transport does no harm to it.