Airbag control unit with part number 56D959655B

What does the airbag control unit 56D959655B do?

The airbag control unit 56D959655B is the central control unit of the restraint system (SRS) of Seat. It evaluates the signals from the crash sensors, decides within milliseconds in an accident on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster. After an accident, it also stores crash data and locks itself. This monitoring runs continuously so that faults are noticed early.

Why does the control unit 56D959655B fail?

Stored crash data is the most common cause, even if no airbag was triggered after the accident; a normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The crash data remains in the unit until it is removed during the repair. Airbag24 takes care of this, since an ordinary diagnostic tool is not sufficient for it.

The remaining causes concern components and connections. Electronics age, solder joints can go cold, and moisture or corrosion affect the plug connections.

How can you tell that the 56D959655B is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, and an error message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and a fault memory cannot be cleared.

As long as such a defect exists, airbags and seatbelt pretensioners may not trigger in an emergency. The light is therefore a warning signal that must be taken seriously.

Which vehicles is the 56D959655B fitted in?

The 56D959655B is fitted in these vehicles: Seat Ibiza 4 [6J] Facelift (2012-2015), 4 [6J] (2008-2012) and 4 [6P] (2015-2017).

You will find the individual vehicles in this overview.

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

Compare the part number on the label of the removed unit with this page. That only confirms that it is the right unit. Have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a plug or a 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 56D959655B work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Afterwards, create a repair order online and send the unit in well packed. Airbag24 tests it on the test bench, repairs defective components, erases stored crash data and carries out a function test.

Your own unit is then returned to you. The processing at Airbag24 itself, i.e. the testing, repairing and function test, 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 56D959655B get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-proof. Good packaging prevents damage in transit.