Airbag control unit with part number 5QF959655AP

What does the airbag control unit 5QF959655AP do?

In the Seat vehicle, the 5QF959655AP takes over the control of the airbag restraint system (SRS). It evaluates sensor signals, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system.

If the system detects a malfunction, it reports this via the airbag warning light. This is how the driver recognises that something is not in order.

In an accident, the unit records crash data and locks itself.

Why does the control unit 5QF959655AP fail?

The most common cause with the 5QF959655AP is an entry in the stored crash data, even without an airbag having deployed. These data cannot be cleared with a usual diagnostic tool; Airbag24 takes over the deletion during the repair. Other causes include ageing of the components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

An accident therefore leaves a trace in the unit that cannot simply be removed. The entry is created regardless of whether an airbag has triggered.

Ageing electronics, cold solder joints and damp plug connections are among the causes that gradually make themselves noticeable. Voltage spikes, for example from a weak battery or a jump start, additionally act on the electronics.

How can you tell that the 5QF959655AP is defective?

A defect in the 5QF959655AP gives itself away through an airbag warning light that stays on permanently or intermittently. Error messages, a missing connection to the diagnostic tool and a fault memory that cannot be cleared may also occur. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

If you see these warning signs, have the fault memory read out. Only the log distinguishes between a control unit fault and a problem in the wiring.

Which vehicles is the 5QF959655AP fitted in?

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

The vehicles are listed here for orientation:

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

Comparing the part number with the label on the removed control unit confirms that you have the right unit in front of you. Whether it is defective is only determined by the fault memory, which you should have read out beforehand.

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 5QF959655AP work?

Before you remove the unit, have the fault memory read out and enclose the log; then disconnect the battery. Afterwards, remove the 5QF959655AP, create the repair order online and send the unit in. At Airbag24, testing, repair and checking together usually take 3–4 working days.

Airbag24 first examines the unit on the test bench. Then defective components are replaced, the crash data are deleted and a function test is carried out. Your own unit is returned to you afterwards.

Pay attention to the sequence of the first steps, because safety depends on it. 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 5QF959655AP get to Airbag24?

You send the 5QF959655AP as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

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