Airbag control unit with part number 5QF959655BG

What does the airbag control unit 5QF959655BG do?

The airbag control unit 5QF959655BG is the central control unit of the restraint system (SRS) in Seat. It evaluates the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

The unit monitors the restraint system continuously, even while driving without an accident. All sensor signals converge there, and the activation of airbags and seatbelt pretensioners originates from this control unit.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 5QF959655BG fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. With your 5QF959655BG, erasing the crash data is often not possible; if you would like it erased, get in touch with Airbag24 briefly before sending the unit in, and Airbag24 will check the number. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Which of these causes applies to a particular unit cannot be determined from the outside. The remaining causes relate to ageing, connections and power supply; only the inspection shows which applies.

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 5QF959655BG is defective?

If the 5QF959655BG is defective, the airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

Check when you switch on the ignition whether the warning light goes out after starting. If it stays on or comes back later, a fault in the restraint system is likely; then have the fault memory read out.

Which vehicles is the 5QF959655BG fitted in?

The control unit 5QF959655BG is fitted in these vehicles: Seat Ibiza 5 [6F] (2017-2021) and 5 [6F] Facelift (from 2021). If your vehicle matches, it is worth comparing it with the unit.

This number is stored for the following vehicles:

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

First compare the part number on the label of the removed unit with this page; this only ensures that it is the correct unit. Also have the fault memory read out before removal, because only the log 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 5QF959655BG work?

First have the fault memory of the 5QF959655BG read out and attach the log; then disconnect the battery and remove the unit. Then create a repair order online and send the unit in well packed. Inspection, repair and function testing at Airbag24 usually take 3–4 working days in total.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a function test; afterwards your own, repaired unit is returned to you. If you would like the crash data erased, get in touch with Airbag24 briefly before sending the unit in.

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 5QF959655BG get to Airbag24?

You send the control unit 5QF959655BG in 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 in the parcel and pack the unit shock-resistant.