Airbag control unit with part number 8W0959655AL

What does the airbag control unit 8W0959655AL do?

The airbag control unit 8W0959655AL forms the central control unit of the restraint system (SRS) of Audi. It evaluates the crash sensors, decides in an emergency within a few milliseconds on airbags and seatbelt pretensioners, and monitors the system continuously; it shows faults via the airbag warning light.

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

The control unit processes the measured values of several sensors at the same time.

Why does the control unit 8W0959655AL fail?

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

A normal diagnostic tool cannot reach this data, so it stays in the memory.

The other causes concern the electronics themselves, their plug connections and the power supply. They develop over a longer period.

Airbag24 then checks the part number before you send the unit in.

How can you tell that the 8W0959655AL is defective?

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

Then airbags and seatbelt pretensioners may possibly not deploy in an emergency. Therefore take the warning seriously and have the vehicle checked promptly.

Which vehicles is the 8W0959655AL fitted in?

The part number 8W0959655AL belongs to a range of particular models. This control unit is fitted at Audi in these vehicles: Audi Q5 FYB Sportback (2020-2024), FY Facelift (2020-2024) and FY (2017-2020).

These models are assigned to the part number:

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

First compare the part number on the label of the removed unit with this page, so that you are sure to have the right unit in front of you. Also have the fault memory read out beforehand, because only this result shows whether the control unit itself or a plug or cable is at fault.

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 8W0959655AL work?

First have the fault memory read out and attach the log, then disconnect the battery and only afterwards remove the control unit. Then create a repair order online and send the unit off well packed. Airbag24 checks it on the test bench, replaces defective components and carries out a function test; processing generally takes 3–4 working days.

If you would like the crash data erased, contact Airbag24 briefly before sending the unit.

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 8W0959655AL get to Airbag24?

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

Put the printed repair order in the parcel and pack the unit shockproof.