Airbag control unit with part number 8W0959655AG

What does the airbag control unit 8W0959655AG do?

The airbag control unit 8W0959655AG is the central control unit of the restraint system (SRS) for Audi. It evaluates the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

It reports faults via the airbag warning light in the instrument cluster, so that you recognise a fault in the system in good time.

Because the control unit controls the triggering of all restraint devices, the protective effect of the entire system depends on it.

Why does the control unit 8W0959655AG fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Erasing this crash data is often not possible with this control unit; if you would like it erased, get in touch with Airbag24 briefly before sending it in. Other causes include aged electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data is a record of the event and not automatic proof of damage to the component. The other causes concern the electronics and their connections.

Aged components and solder joints change over time. Moisture and corrosion attack plug connectors, and voltage spikes stress the electronics, for example with a weak battery or jump-starting.

How can you tell that the 8W0959655AG is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may not deploy.

The warning light is the most visible feedback from the system, and it should not be ignored. A fault that is displayed only intermittently also merits a check.

Without a connection to the diagnostic tool, the cause remains unclear in individual cases until the fault memory has been read out.

Which vehicles is the 8W0959655AG fitted in?

The airbag control unit 8W0959655AG is fitted in these vehicles: Audi Q5 FYB Sportback (2020-2024), FY Facelift (2020-2024) and FY (2017-2020).

These vehicles belong to the part number:

• Audi Q5 FYB Sportback (2020-2024)
• Audi Q5 FY Facelift (2020-2024)
• Audi Q5 FY (2017-2020)

First, check whether the part number on the label of the removed unit matches this page. This only secures that you have the right unit. Second, have the fault memory read out beforehand, because only this log 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 80A 959 655 AA, 80A 959 655 AC, 80A 959 655 AE, 80A 959 655 G, 80A 959 655 J, 80A 959 655 L.

How does the repair of the 8W0959655AG work?

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

The sequence serves your safety: the control unit is only removed once the battery has been disconnected.

Airbag24 tests the unit on the test bench, replaces defective components and carries out a function test. If you would like the crash data erased, get in touch with Airbag24 briefly before sending it 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 8W0959655AG 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 to you by UPS.

Packed shock-resistant and enclosed with the printed repair order in the parcel, the unit is on its way.