Airbag control unit with part number 5QF959655A

What does the airbag control unit 5QF959655A do?

The airbag control unit 5QF959655A coordinates the restraint system (SRS) in Seat. It processes the messages from the crash sensors, determines in the event of an accident which airbags and seatbelt pretensioners are to deploy, and checks the system continuously. After an accident, it stores crash data and locks itself.

The evaluation runs in the background and takes only milliseconds once it matters. If the unit detects a fault, it indicates it via the airbag warning light in the instrument cluster.

The crash data remain in memory, regardless of whether an airbag has deployed.

Why does the control unit 5QF959655A fail?

The most common cause is the crash data stored after an accident, even without a deployed airbag. A normal diagnostic tool cannot erase it; Airbag24 removes it during the repair. Other possible causes include aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

For the unit, the stored data is a recorded event. In everyday use you notice nothing of it as long as no fault message appears.

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

Which of these causes is present only becomes apparent during the examination on the test bench.

How can you tell that the 5QF959655A is defective?

A defect shows up as an airbag warning light in the instrument cluster that lights up, as a fault message in the instrument cluster, as a lack of connection to the diagnostic tool, or as a fault memory that cannot be cleared. In that case, the airbags and seatbelt pretensioners may not be able to deploy in an emergency.

The airbag warning light may stay on permanently or only flicker occasionally. Either is a sign you should take seriously.

A diagnostic tool without a connection to the control unit, or a fault memory that cannot be reset, indicates a fault in the system. An inspection will establish whether the control unit itself is affected.

Which vehicles is the 5QF959655A fitted in?

The control unit 5QF959655A is fitted in these vehicles: Seat Ibiza 5 [6F] (2017-2021) and 5 [6F] Facelift (from 2021).

The affected vehicles in detail:

• Seat Ibiza 5 [6F] (2017-2021)
• Seat Ibiza 5 [6F] Facelift (from 2021)

On the one hand, comparing the part number on the label of the removed unit with this page is enough to make sure it is the right unit. On the other hand, have the fault memory read out before removal, because only that 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 5QF 959 655 L, 5QF 959 655 N, 5QF959655AE, 5QF959655AG, 5QF959655AM, 5QF959655M.

How does the repair of the 5QF959655A work?

First, have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, repairs defective components, erases the stored crash data and runs a function test.

Afterwards your own unit is returned to you. 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 5QF959655A get to Airbag24?

You send in the control unit 5QF959655A as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.